A combined construction method of trenching and pre-drilling and TRD anti-seepage wall

Abstract

This invention relates to the field of operational control technology, and more particularly to a combined construction method for trenching pilot holes and TRD (Tunnel Diversion) cutoff wall. The method includes the following steps: acquiring TRD cutoff wall design data, and acquiring obstacle data based on the TRD cutoff wall design data; performing axis risk segmentation based on the obstacle data to obtain axis risk data; arranging pilot holes for axis stability based on the axis risk data to obtain pilot hole arrangement data; setting pilot hole mechanical matching based on the pilot hole arrangement data to obtain pilot hole mechanical matching data; performing non-obstacle clearing processing on the pilot hole mechanical matching data to obtain non-obstacle clearing data for the pilot holes; and performing passive axis guidance for TRD trenching based on the non-obstacle clearing data for the pilot holes to obtain TRD trenching guidance data. This invention, by arranging structural low-resistance pilot holes before TRD trenching, achieves force redistribution and offset trend suppression of the cutter head in the obstacle area, effectively improving the axis stability of the cutoff wall and the continuity of trenching.

Description

Technical Field

[0001] This invention relates to the field of operational control technology, and in particular to a construction method combining trenching and pre-drilling with a TRD (Tunnel Diversion) anti-seepage wall. Background Technology

[0002] With the increasing density of urban construction, many TRD (Transmission Removal and Diffusion) cutoff wall construction sites are located in old urban areas, areas with dense existing underground structures, or complex geological environments. Due to its continuous mixing, low disturbance, and excellent seepage prevention performance, the TRD method has been widely used in deep foundation pit support, environmental remediation, and hydraulic cofferdam projects. However, when encountering underground obstacles (such as boulders, broken piles, abandoned pipelines, and old foundation components), the TRD cutter head is prone to instantaneous deviation, abnormal expansion of the trench width, or loss of control over the wall axis during the advancement process, seriously affecting the trenching quality and construction safety of the cutoff wall. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a combined construction method of trenching and pre-drilling with a TRD (Tunnel Diversion) anti-seepage wall, thereby resolving at least one of the aforementioned technical issues.

[0004] This application provides a construction method combining trenching and pre-drilling with a TRD (Tunnel Diversion) waterproofing wall. The method includes:

[0005] Obtain TRD cutoff wall design data, and obtain obstacle data based on the TRD cutoff wall design data; perform axis risk segmentation based on obstacle data to obtain axis risk data;

[0006] Based on the axis risk data, the axis stability pilot hole arrangement is carried out to obtain the pilot hole arrangement data;

[0007] Based on the borehole layout data, borehole mechanical matching settings are performed to obtain borehole mechanical matching data; the borehole mechanical matching data is then processed to remove obstacles to obtain borehole unobstructed data.

[0008] Based on the non-obstruction data of the pilot hole, passive axis guidance for TRD trenching is performed to obtain TRD trenching guidance data.

[0009] This invention acquires obstacle information based on TRD cutoff wall design data and divides the construction axis into risk segments from the perspective of axial stability, making the placement of pilot holes clearly targeted and avoiding blind or experience-based construction. By placing axial stability pilot holes in high-risk axial sections and implementing mechanical matching settings and non-obstacle-clearing treatment for the pilot holes, a low-resistivity mechanical guiding environment relative to the surrounding strata is formed without removing underground obstacles or introducing additional reinforcement structures. This promotes automatic redistribution of force on the cutter head during TRD trenching. Based on this low-resistivity mechanical environment, when the TRD cutter head encounters local high-strength obstacles or abrupt changes in strata, it can passively suppress the deviation trend and maintain stable advancement along the design axis, effectively reducing the risk of abnormal trench width expansion and axial loss of control.

[0010] Optionally, acquiring obstacle data includes:

[0011] Obtain TRD cutoff wall design data;

[0012] The construction axis range is defined based on the TRD cutoff wall design data, and the construction axis range data is obtained.

[0013] The obstacle sensing area is determined based on the construction axis range data, and the obstacle sensing area data is obtained.

[0014] Obstacle data is obtained by aggregating obstacles from multiple sources based on obstacle perception area data.

[0015] This invention uses TRD (Traffic Damping) cutoff wall design data as a basis to define the construction axis range and determine the obstacle sensing zone accordingly. This method transforms the acquisition of underground obstacle data from traditional generalized surveys of the entire site to directional sensing and focused collection around the cutoff wall axis, effectively avoiding interference from irrelevant area information on construction decisions. By clearly defining the obstacle sensing zone, the scope of obstacle data collection is highly consistent with the actual stress and stability sensitive areas of the cutterhead during TRD trenching, thereby improving the correlation and effectiveness between the acquired obstacle data and construction risks. Through unified collection and processing of obstacle information from multiple sources, the impact of underground obstacles on the TRD trenching process in terms of spatial distribution, depth range, and structural characteristics can be represented.

[0016] Optionally, the axis risk segmentation includes:

[0017] Based on the obstacle data, the TRD cutoff wall design data is projected onto the axis to obtain the axis projection data;

[0018] The obstacle influence zone is generated based on the axis projection data, and the obstacle influence zone data is obtained.

[0019] The cutting force interference is evaluated by analyzing the data in the obstacle influence area to obtain the cutting force interference data;

[0020] Based on the cutting force interference data, the axis stability risk is determined, and the axis risk data is obtained.

[0021] This invention utilizes axial projection processing between underground obstacle data and the TRD cutoff wall design axis. This maps obstacle information, originally scattered in three-dimensional space, uniformly onto the cutoff wall axis, transforming the impact of obstacles under underground conditions into quantifiable and segmentable impact intervals along the construction axis. Based on these generated obstacle impact intervals, targeted assessments are conducted to evaluate potential cutting force disturbances during trenching. This ensures that axis risk assessment no longer relies solely on the presence or absence of obstacles but directly relates to their actual impact on the stress state and propulsion stability of the TRD cutterhead. By introducing cutting force disturbance assessment and using it to determine axis stability risk, it effectively identifies axis segments prone to sudden changes in cutterhead stress and concentrated risk of deviation, thus avoiding the indiscriminate assessment of all obstacles as having equal risk.

[0022] Optionally, the arrangement of the axial stability pilot holes includes:

[0023] Risk axis segments are extracted based on axis risk data to obtain risk axis segment data;

[0024] The risk axis segment data is used to determine the deployment trigger, and deployment trigger data is obtained.

[0025] Based on the layout trigger data, the lateral direction of the pilot hole layout is determined, and the lateral layout direction data is obtained;

[0026] The parallel relationship between the borehole axis and the lateral arrangement direction data is set to obtain the borehole parallel setting data.

[0027] The lateral offset of the pilot hole is determined based on the TRD cutoff wall design data, and the lateral offset data of the pilot hole is obtained.

[0028] The longitudinal spacing of the pilot holes is determined based on the risk axis section data, and the longitudinal spacing of the pilot holes is obtained.

[0029] The lateral arrangement direction data, pilot hole parallel setting data, pilot hole lateral offset data, and pilot hole longitudinal arrangement spacing data are integrated to obtain the pilot hole arrangement data.

[0030] This invention extracts risk axis sections based on axis risk data and sets layout trigger judgments, avoiding indiscriminate placement of pilot holes across the entire line. Pilot hole placement is limited to sections that substantially affect axis stability, thus improving the targeting and engineering rationality of pilot hole placement. By determining the lateral direction of pilot hole placement and setting the parallel relationship between the pilot hole axis and the cutoff wall axis, the pilot holes are spatially aligned with the cutoff wall axis, facilitating the formation of continuous mechanical guidance conditions along the axis during trenching. By combining TRD cutoff wall design data to determine the lateral offset of pilot holes and setting the longitudinal spacing of pilot holes based on the length and distribution characteristics of risk axis sections, the pilot holes possess controllable spatial parameters in both the lateral and longitudinal directions, preventing weakened low-resistance guidance effects due to placement that is too close or too far apart. By integrating parameters such as lateral placement direction, pilot hole parallel setting, lateral offset, and longitudinal spacing, pilot hole placement data is formed, transforming pilot hole placement from empirical judgment into a structured and reproducible layout scheme.

[0031] Optionally, the aperture mechanical matching setting includes:

[0032] The pilot hole functional section is determined based on the pilot hole layout data, and the pilot hole functional section data is obtained.

[0033] Based on the data of the pilot hole's functional section, the effective functional depth of the pilot hole is matched and set to obtain the functional depth matching data.

[0034] The aperture range data is obtained by matching the low resistance characteristics of the pilot hole diameter to the depth of action matching data.

[0035] Based on the axis risk data, the mechanical synergy relationship between the pilot holes is analyzed, and the relationship data between the pilot holes is obtained.

[0036] The pilot hole filling state is set based on the aperture range data to obtain pilot hole filling state data;

[0037] Based on the action depth matching data, aperture range data, inter-pipe relationship data, and pilot hole filling state data, pilot hole mechanical matching verification is performed to obtain pilot hole mechanical matching data.

[0038] This invention clearly defines the effective zones of the pilot holes based on their layout data, and matches the effective depth of each pilot hole to these zones. This ensures that the range of action of the pilot holes in the depth direction is consistent with the distribution of underground obstacles and the stress-sensitive area of ​​the cutter head during TRD trenching, avoiding insufficient mechanical guidance due to a mismatch between the pilot hole's effective depth and the actual stress location. By matching the pilot hole diameter with low-resistivity characteristics within the effective depth range, the pilot holes achieve controllable low-resistivity mechanical characteristics relative to the surrounding strata, thus providing the necessary spatial conditions for the redistribution of force on the cutter head without weakening the main structure of the cutter wall. Through analysis of the mechanical synergy between pilot holes, adjacent pilot holes can form a continuous or progressive mechanical guidance effect in the axial direction, avoiding the discrete effect of a single pilot hole that has little impact on trenching stability. The pilot hole filling state is specifically set based on the diameter range data, ensuring that the pilot holes maintain low-resistivity characteristics and are perturbed during construction, enhancing their ability to participate in mechanical adjustment during trenching. By performing a unified mechanical matching verification on the working depth, aperture range, relationship between pilot holes and filling state, the pilot hole related parameters are transformed from scattered settings into a holistic and controlled mechanical matching result.

[0039] Optionally, the low-resistance characteristic matching setting of the aperture includes:

[0040] Formation cutting features are extracted based on the depth-of-action matching data to obtain formation cutting feature data;

[0041] The low-resistance characteristics of the pilot hole are determined based on the formation cutting characteristic data, and the low-resistance characteristic data of the pilot hole are obtained.

[0042] Based on the low-resistivity characteristic data of the pilot hole, the pilot hole diameter relationship is constructed to obtain the pilot hole diameter relationship data;

[0043] Based on the data on the arrangement of the pilot holes and the relationship between the pilot hole diameters, upper and lower limits are set to obtain the range of hole diameters.

[0044] This invention extracts formation cutting characteristics within a predetermined pilot hole depth range, directly linking the borehole diameter setting process to the cutting response characteristics of the formation to the cutter head during TRD trenching. This avoids problems such as insufficient low-resistance effect or excessive structural impact caused by determining the borehole diameter solely based on formation type or empirical values. By determining the required low-resistance characteristics of the pilot hole based on formation cutting characteristics, the target for setting the pilot hole diameter shifts from a simple geometric dimension to a clear requirement for adjusting cutting resistance, thereby enhancing the effectiveness of the pilot hole in redistributing the force on the cutter head during trenching. By establishing a correspondence between the pilot hole diameter and low-resistance characteristics, the diameter becomes an adjustable and verifiable mechanical parameter, rather than an isolated construction dimension setting. In conjunction with pilot hole layout data, upper and lower limits are set for the borehole diameter, ensuring that the pilot hole can form an effective low-resistance zone relative to the surrounding formation within the specified depth range, while avoiding the adverse effects of excessively large borehole diameters on the integrity of the main structure of the cutoff wall and the geometric stability of the trench.

[0045] Optionally, the non-obstruction clearing process includes:

[0046] The non-obstacle-clearing target confirmation was performed on the mechanical matching data of the pilot hole to obtain the non-obstacle-clearing target data;

[0047] Based on the non-obstruction removal target, the hole processing method is selected, and the hole processing method data is obtained;

[0048] Mechanical control simulation was performed on the data of the hole processing method to obtain mechanical control data;

[0049] Based on the mechanical control data, the low resistance characteristics of the pilot hole are maintained and verified, and the non-obstruction data of the pilot hole is obtained.

[0050] This invention introduces a non-obstacle-clearing process after the pilot hole mechanical matching is set. This ensures that the pilot hole is clearly defined as a structural unit participating in the mechanical adjustment of the TRD trenching process before construction, rather than a pretreatment method for removing underground obstacles or reinforcing the foundation. By confirming the non-obstacle-clearing target in the pilot hole mechanical matching data, the structural attributes and mechanical state that the pilot hole should maintain during the trenching stage are pre-defined, providing clear target constraints for construction implementation and avoiding weakening the low-resistance guiding role of the pilot hole due to inappropriate treatment methods. The pilot hole treatment method is selected based on the non-obstacle-clearing target, and mechanical control simulation is performed on the selected method to ensure that the mechanical response of the pilot hole under actual construction conditions remains consistent with the expected low-resistance characteristics, thereby reducing the risk of the pilot hole function deviating from the design target due to construction uncertainties. By verifying the maintenance of the low-resistance characteristics of the pilot hole, it is possible to identify whether the pilot hole state meets the conditions for participating in the force redistribution of the cutter head before trenching, ensuring that the pilot hole continues to play its mechanical guiding role without removing underground obstacles or introducing additional reinforcement structures.

[0051] Optionally, the non-obstacle clearing target confirmation includes:

[0052] Based on the mechanical matching data of the pilot hole, mechanical functional processing of the pilot hole is performed to obtain the mechanical functional data of the pilot hole.

[0053] Based on the axis risk data, the state retention data of the pilot hole mechanical function data is determined to obtain the state retention data.

[0054] Based on the state-preserving data, non-obstacle-clearing constraints are applied to obtain non-obstacle-clearing constraint data;

[0055] The target structure of the pilot hole is determined based on the non-obstacle clearing constraint data, and the target structure data of the pilot hole is obtained.

[0056] Based on the mechanical function data of the pilot hole and the target structure data of the pilot hole, a joint verification was performed to obtain the non-obstacle clearing target data.

[0057] This invention processes the mechanical matching data of pilot holes to transform their role in the TRD trenching process from a simple geometric opening into an engineering unit with a clear mechanical function. By combining axial risk data with a state-maintaining determination of the pilot hole's mechanical function, the need for the pilot hole to continuously participate in force adjustment during the trenching stage is directly linked to the axial stability risk. This avoids applying the same treatment strategy to all pilot holes and improves the specificity of non-obstacle-clearing target confirmation. By introducing non-obstacle-clearing constraints, the boundary conditions that pilot holes should not be treated as obstacle-clearing structures or reinforcement components before and during construction are clearly defined, effectively preventing the mechanical function of pilot holes from being damaged due to empirical operations during construction. By determining the target structure of the pilot hole, its structural attributes are clearly defined as perturbed, low-stiffness, or non-load-bearing, thus aligning with its functional requirement of participating in mechanical adjustment during trenching. Through collaborative verification of the pilot hole's mechanical function and the target structure, the confirmed non-obstacle-clearing target is ensured to have consistency and feasibility between functional requirements and structural realization.

[0058] Optionally, the TRD trenching passive axis guidance includes:

[0059] Based on the non-obstruction data of the pilot hole, the TRD trenching operation section is matched to obtain the operation section data;

[0060] Based on the data of the working section, the mechanical response activation of the low resistance region of the pilot hole and the processing of the uneven force state of the cutter head are carried out to obtain the data of the low resistance region of the pilot hole and the data of uneven force.

[0061] Based on the data of the low-resistance region of the pilot hole and the data of uneven force distribution, the force redistribution data is obtained.

[0062] Passive axis regression was performed based on the force redistribution data to obtain TRD trenching guidance data.

[0063] This invention matches the non-obstruction data of the pilot borehole with the TRD trenching operation section, ensuring that passive axis guidance is activated only in operation sections with actual deviation risks. This avoids introducing unnecessary construction interventions across the entire line, thereby improving the targeting and stability of the trenching process. By activating the mechanical response of the low-resistivity region of the pilot borehole and combining it with the identification and processing of the uneven force state of the cutter head, the stress state of the cutter head during the TRD trenching process can be accurately sensed and adjusted. Through the force redistribution processing based on the low-resistivity region and the uneven force state, the lateral deviation trend generated during the cutter head advancement can be naturally reduced and mitigated at the mechanical level without introducing additional active control commands or real-time adjustment systems, thus achieving true passive axis guidance. Through the above passive axis regression process, the abnormal expansion of the trench width and the accumulation of axis deviation during the trenching process can be effectively suppressed, ensuring the stable trenching of the cut-off wall along the design axis.

[0064] Optionally, this application also provides a combined construction system for trenching and pre-drilling and TRD cutoff wall, used to perform the combined construction method of trenching and pre-drilling and TRD cutoff wall as described above, wherein the combined construction system for trenching and pre-drilling and TRD cutoff wall includes:

[0065] The axis risk segmentation module is used to acquire TRD cutoff wall design data and obtain obstacle data based on the TRD cutoff wall design data; and to perform axis risk segmentation based on the obstacle data to obtain axis risk data.

[0066] The axis stability pilot hole arrangement module is used to arrange axis stability pilot holes based on axis risk data to obtain pilot hole arrangement data.

[0067] The non-obstacle clearing module is used to set the mechanical matching of the pilot holes based on the pilot hole layout data to obtain the pilot hole mechanical matching data; and to perform non-obstacle clearing processing on the pilot hole mechanical matching data to obtain the pilot hole non-obstacle clearing data.

[0068] The TRD trenching passive axis guidance module is used to perform TRD trenching passive axis guidance based on the non-obstruction data of the pilot hole, and obtain TRD trenching guidance data.

[0069] The purpose of this invention is to obtain obstacle information based on TRD cutoff wall design data before construction and to segment the construction axis into risk zones from the perspective of axial stability. This transforms the impact of underground obstacles on the trenching process from a spatially dispersed state into identifiable and segmentable risk zones along the axis. By implementing axial stability pilot hole arrangements only within the risk axis zones and structurally setting parameters such as the spatial location, orientation, and spacing of the pilot holes, the pilot hole arrangement is no longer an empirical operation but a directional structural measure directly related to the axis risk. By setting multi-dimensional mechanical matching parameters for the pilot holes, including their effective zone, effective depth, low-resistivity characteristics, inter-pilot relationships, and filling state, the pilot holes possess a clear mechanical adjustment function during the construction phase, providing stable spatial conditions for the redistribution of force on the cutter head. Through non-obstacle-clearing treatment, without removing underground obstacles or introducing additional reinforcement structures, the target structural state that the pilot holes should maintain during the trenching stage is clearly defined. Through the selection of treatment methods, mechanical control simulation, and verification of low-resistivity characteristics, it is ensured that the pilot holes continuously play a low-resistivity mechanical guiding role in actual construction. Based on the aforementioned structural and mechanical design, during the TRD trenching process, when encountering local high-strength obstacles or abrupt changes in formation, the passive redistribution of the force on the cutter head can be achieved through the low-resistance region of the pilot hole, thereby suppressing the offset trend and achieving passive return of the axis. Attached Figure Description

[0070] Other features, objects, and advantages of this application will become more apparent from the following detailed description of the non-limiting embodiments, taken with reference to the accompanying drawings:

[0071] Figure 1 A flowchart illustrating the steps of a construction method combining trenching and pre-drilling with a TRD (Tunnel Diversion) anti-seepage wall according to an embodiment is shown.

[0072] Figure 2 A flowchart illustrating the steps of a TRD (Transmission Controlled Resistant Surface) design data acquisition method according to an embodiment is shown.

[0073] Figure 3 A flowchart illustrating the steps of a method for arranging axial stability pilot holes according to an embodiment is shown.

[0074] Figure 4 A flowchart illustrating the steps of a method for setting the mechanical matching of a pilot hole according to an embodiment is shown.

[0075] Figure 5 A flowchart illustrating the steps of a passive axis guidance method for TRD trenching according to an embodiment is shown.

[0076] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0077] The technical method of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0078] Furthermore, the accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. Functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor methods and / or microcontroller methods.

[0079] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0080] Please see Figures 1 to 5 This application provides a construction method combining trenching and pre-drilling with a TRD (Tunnel Diversion) anti-seepage wall, the method comprising:

[0081] S1. Obtain TRD cutoff wall design data, and obtain obstacle data based on the TRD cutoff wall design data; perform axis risk segmentation based on obstacle data to obtain axis risk data;

[0082] In one embodiment, the TRD (Transmission Removal Debris) anti-seepage wall in a foundation pit project in an old urban area has a design depth of 22 meters and a total axial length of 65 meters, located between existing buildings and old municipal drainage pipelines. Based on the anti-seepage wall design drawings, the construction team / system determined a 3-meter radius on each side of the axial line as the obstacle sensing zone. Within this sensing zone, the system aggregates multi-source obstacle information, including the location of pebble interlayers marked in the original geological survey report, the remaining old concrete piles recorded in the BIM model, the distribution location of foundation cap edges in adjacent engineering drawings, and the depth range of high-strength boulders (12 to 16 meters) fed back from on-site test boreholes. The system projects the above obstacle information along the axial direction, sets a threshold based on the minimum distance between obstacles (e.g., less than 1.5 meters is considered a continuous segment), merges adjacent affected areas into a complete obstacle affected segment, and divides the area into 6 obstacle affected segments. For each obstacle-affected section, the system assesses the increase in resistance to TRD cutting operations by combining the physical characteristics of the corresponding strata or obstacle. Specifically, the system correlates and matches obstacle types within the affected section with local stratum information. This process involves projecting the obstacle's three-dimensional position onto the TRD axis coordinate system and extracting stratum parameters within its depth range, such as soil structure composition, standard penetration value (N value), and undisturbed shear strength. Based on the obstacle's physical properties (such as material, density, and hardness grade), the system calls a pre-defined stratum-obstacle coupling rule base. This rule base is constructed from construction experience and experimental data from multiple projects, clearly defining the disturbances caused by different obstacles to TRD cutting in different strata. The system assesses the impact of obstacles, such as boulders and residual concrete piles, by setting a disturbance shear strength amplification coefficient to represent the increased cutting load introduced by these obstacles relative to the background soil. The system calculates the ratio of the shear strength difference between the obstacle and the surrounding soil, as well as the interference width, and combines this with the depth overlap rate within the design construction depth to form three basic evaluation parameters. Based on these parameters, the system constructs a local impedance amplification score and quantitatively calibrates each obstacle-affected section. For example, if an obstacle's shear strength is five times that of the base soil and it occupies more than 60% of the construction depth, the system will set its score above 0.8, classifying it as a strong interference section. All scores are output as a unified cutting resistance amplification level. Based on the cutting resistance amplification level, the system identifies three continuous areas exceeding 2 meters in length with high impact intensity and marks them as high-risk axis segments, integrating them to obtain axis risk data. The axis risk data output by the system can provide construction units with differentiated equipment configuration and work rhythm suggestions.

[0083] S2. Arrange the pilot holes for axis stability based on the axis risk data to obtain the pilot hole arrangement data;

[0084] In one embodiment, for the three high-risk axial sections identified in step S1, with lengths of 2.5 meters, 3.0 meters, and 2.8 meters respectively, the construction team arranged 2 to 3 sets of pilot holes in each risk section. Each set of pilot holes was located on both sides of the TRD cutoff wall design axis, laterally offset from the axis by approximately 0.8 meters, to form a symmetrical arrangement. To enhance the guiding role of the pilot holes during construction, each pilot hole was arranged parallel to the TRD design trench line at a slight deviation of approximately 3 degrees, aiming to form a mechanically induced path along the axial direction. The depth of the pilot holes was set between 13 and 17 meters to fully cover the main impact layers where obstacles might cause cutting impact. The spacing between each set of pilot holes along the axial direction was controlled within 1.5 meters to ensure the continuity of the low-resistance path. Through the above arrangement, the system generated arrangement data containing 7 sets, totaling 14 pilot holes, which served as the basis for subsequent mechanical matching and construction path optimization, helping to improve the axial stability and construction controllability of high-risk sections.

[0085] S3. Set the mechanical matching of the pilot holes according to the pilot hole layout data to obtain the pilot hole mechanical matching data; perform non-obstacle clearing processing on the pilot hole mechanical matching data to obtain non-obstacle clearing data of the pilot holes.

[0086] In one embodiment, based on the aforementioned pilot hole layout data, the system sets mechanical parameters for each group of pilot holes. The data sources include: 1) geological exploration data and test hole feedback to identify the critical depth range where obstacles are located; 2) an existing database of parameter experience from similar projects to match the correlation between hole diameter and disturbance level; and 3) feedback from internal simulation results to adjust the filling material parameters to meet the perturbability requirements. Regarding the depth of action, considering the stratigraphic range of the cutting impact caused by the obstacle, the effective intervention depth of each pilot hole is set between 12 and 18 meters. Regarding the hole diameter, to achieve the preset low-resistance requirement for a moderate perturbability level, a hole diameter of 140 mm is selected. For the filling material, the system uses a mixture of low-density bentonite and quartz sand as a loose filling medium, controlling the filling density to not exceed 1.3 grams per cubic centimeter to ensure that the filling material can locally fracture under stress when the TRD cutter head passes through, thereby reducing propulsion resistance. The system used finite element simulation tools to simulate the disturbance path of three sets of continuous pilot hole sections. The simulation scenario involved the TRD cutter head advancing with a deviation of 5 cm from the design axis. Simulation verified that the force path could return to the original axis within approximately 1.2 seconds. This mechanical matching result, after unified system verification, confirmed that under the influence of obstacles, the cutting force deviation of the cutter head was controlled within 18%, demonstrating good axis guidance and return characteristics. The above matching results served as input conditions for the pilot hole non-obstacle removal process. During this process, the system did not physically remove any hard obstacles or inject high-strength solidified slurry, ensuring that the pilot holes maintained their non-obstacle-removable and disturbable characteristics, meeting the mechanical guidance and risk avoidance requirements of TRD construction. The system outputs pilot hole non-obstacle removal data.

[0087] S4. Based on the non-obstruction data of the pilot hole, perform passive axis guidance for TRD trenching to obtain TRD trenching guidance data.

[0088] In one embodiment, when the TRD equipment advanced to the first high-risk axis section, the system monitored a sudden increase in force of approximately 20% on the left side of the cutter head, but no manual intervention was triggered. Subsequently, during the continuous advancement of approximately 1.3 meters, the cutter head automatically returned from a 4 cm leftward deviation to a control range of ±1 cm from the design axis center, without any significant cumulative deviation. This return process benefited from the low-resistance channel formed by the left-side pilot hole area. When the cutter head deviated, it preferentially entered the pilot hole disturbance path with lower resistance, thus forming a force self-balancing mechanism that prompted the cutter head to return to the preset trench line. During construction, the trench width was stably controlled between 450 mm ± 10 mm, and no abnormal phenomena such as trench wall tearing or local excessive width were observed. Throughout the trenching operation of the three high-risk axis sections, no axis jumps or discontinuous backfilling at the trench bottom occurred. According to construction log statistics, compared to the conventional section without pilot holes, the cutter head deviation correction behavior in the pilot hole auxiliary area was reduced by approximately 70%, and no repair rework events occurred, improving construction efficiency and the continuity and integrity of the cutoff wall. The system outputs TRD slotting guidance data.

[0089] Optionally, acquiring obstacle data includes:

[0090] S11. Obtain TRD cutoff wall design data;

[0091] In one embodiment, in an urban renewal project, the design unit provided a preliminary design drawing of a TRD (Transmission Controlled Recess) cutoff wall with a total length of 82 meters and a design depth of 21 meters. The design drawing clearly marked the design axis of the cutoff wall, the cross-sectional form of the wall, the layout range of the construction work zone (2 meters on each side), and the minimum clearance requirement between the end of the wall and the existing pile foundation. Based on this drawing, the construction unit / system imported relevant design data through the BIM platform, extracted the three-dimensional coordinate information and cross-sectional structure data of the wall's centerline, and used this centerline as the axial basis for the obstacle perception range in obstacle identification and risk analysis.

[0092] S12. Based on the TRD anti-seepage wall design data, the construction axis range is defined to obtain the construction axis range data;

[0093] In one embodiment, based on the aforementioned design data for the TRD cutoff wall, the system extends the design axis horizontally by 2.5 meters to the left and right, and vertically by 1 meter downward, thereby constructing a three-dimensional axis region covering the area affected by construction disturbance. Taking this project as an example, the resulting construction axis region is a regular strip-shaped space with a length of 82 meters, a width of 5 meters, and a depth of 22 meters. This region covers the locations where the TRD equipment causes disturbance during construction. The system defines this region as the construction axis region.

[0094] S13. Determine the obstacle sensing area based on the construction axis range data to obtain obstacle sensing area data;

[0095] In one embodiment, the system delineates an obstacle sensing zone based on pre-defined construction axis range data. Longitudinally, the system divides the entire construction axis into several sub-segments every 2 meters; laterally, for areas crossing existing buildings or underground passages (such as the area with abandoned municipal pipelines in the 26-meter to 36-meter section), the system extends the lateral sensing range of the sensing zone to 3 meters; in the depth direction, the system sets the filtering range for sensing data to 5 to 20 meters. After processing according to these rules, an obstacle sensing zone with a size of approximately 82 meters is formed. 6 meters A 15-meter composite sensing section was established, and this area was divided into three-dimensional grid units with unique numbers.

[0096] S14. Obstacle data is obtained by aggregating obstacles from multiple sources based on the obstacle perception area data.

[0097] In one embodiment, the system collects and aggregates obstacle information from multiple sources within a defined obstacle sensing area, integrating data from different sources to construct a complete obstacle dataset. The system imports historical geological survey reports, extracting information on 8-15 meter deep isolated boulder layers revealed by boreholes DK-07 and DK-09, and marking this information as a hard disturbance risk. By accessing the underground pipeline database of the municipal GIS system, the system identifies an abandoned concrete pipeline located in the 29-34 meter section, buried at a depth of approximately 12 meters. The construction unit drilled a 90 mm diameter, 18-meter deep test borehole at the 41-meter position, and an anomaly occurred at a depth of 10.2 meters, which was determined to be the edge structure of the old foundation concrete. The system imports relevant records from surrounding construction projects and, referring to descriptions of early building pile foundations in adjacent project reports, determines the possibility of broken pile residue at the 60-meter position. The system performs standardized format processing, spatial coordinate transformation, and encoding normalization on all the above information to form a structured obstacle dataset containing key elements such as obstacle type, spatial coordinate range, and estimated intensity level.

[0098] Optionally, the axis risk segmentation includes:

[0099] Based on the obstacle data, the TRD cutoff wall design data is projected onto the axis to obtain the axis projection data;

[0100] In one embodiment, in a river seepage prevention and control project, the TRD seepage barrier wall has a design axis length of 96 meters and a design depth of 20 meters. The system performs linear fitting on the axis coordinates at 1-meter intervals to generate a continuous sequence of axis points as the basis for analysis. The system converts the previously acquired obstacle data (including old piles, boulders, high-strength interlayers, abandoned pipelines, etc.) into a unified three-dimensional spatial coordinate expression and uses minimum distance matching to project each obstacle onto the nearest TRD axis point segment on the plane, thus forming the axis projection data of the obstacle. For example, the boulder obstacle O1 has center coordinates of (x=24.2, y=16.5, z=12.3). The system projects it onto the nearest 25-meter axis point segment, corresponding to plane coordinates of (x=24.0, y=16.2), and retains its depth z=12.3 and obstacle type information to form projection data point A1. The system performs spatial projection processing on all obstacles in this way to form an axis projection data list containing projection position, depth information, and type label.

[0101] The obstacle influence zone is generated based on the axis projection data, and the obstacle influence zone data is obtained.

[0102] In one embodiment, the system generates corresponding obstacle influence ranges based on the aforementioned obtained axis projection data to clarify the specific interference range of various obstacles on the TRD construction path. In the longitudinal direction, the system extends equidistantly from the axis projection point of each obstacle according to its actual lateral width, forming an influence segment along the TRD axis. For example, for a boulder with a lateral diameter of 1.0 meter, the system extends 0.5 meters to the left and right in the axial direction, resulting in a longitudinal influence range of 24.5 meters to 25.5 meters. In the depth direction, the system uses the center depth of the obstacle as a reference value and extends upwards and downwards by 0.6 meters to generate a vertical influence range. For example, if the center depth of the obstacle is 12.3 meters, the influence range is 11.7 meters to 12.9 meters. Based on the material properties of obstacles or historical construction data, the system labels each affected section with its potential impact characteristics, such as "high rigidity," "high shear," or "uniform shear." If the obstacle is made of natural rock, boulders, pile foundation residue, or other materials with significantly higher shear strength than adjacent soil layers, and there is a momentary torque increase during drilling, the system labels it as high rigidity. If the obstacle exhibits strong torsional feedback and drastic changes in shear strength between strata, the system labels it as high shear. If the obstacle itself has uneven material distribution, discontinuous structural boundaries, or significant historical construction disturbances, the system labels it as uniform shear. The system integrates all processed obstacle information into a set of structured impact zone objects. Each object contains specific axis location, depth range, and impact intensity type labels, and is uniformly output as obstacle impact zone data.

[0103] The cutting force interference is evaluated by analyzing the data in the obstacle influence area to obtain the cutting force interference data;

[0104] In one embodiment, the system evaluates the cutting force interference in each section based on the aforementioned obstacle influence zone data, generating cutting force interference data. During the evaluation process, the system establishes a standard cutting resistance reference model for the regional strata. For example, the standard penetration value of the foundation soil in this project area is generally / preset to be 15 to 20, corresponding to a clay shear strength of approximately 50 to 60 kPa, serving as a benchmark resistance under obstacle-free background conditions. The system performs specific analysis for each obstacle influence zone. For example, for section A1 (a boulder area), based on relevant literature and field borehole feedback data, the system estimates the disturbance shear strength of the boulder to be approximately 350 kPa, which is approximately 5 to 6 times that of the surrounding foundation soil layers. Based on this, the system calculates the resistance difference between the obstacle and the surrounding soil layers in that section. Combining the obstacle's hardness characteristics, the width of its contact with the TRD cutter head, and the degree of depth overlap between the obstacle and the construction layer, the system determines the disturbance intensity / cutting interference score it poses to the TRD cutting process. Specifically, the system extracts three indicators for each obstacle-affected section: first, the strength difference factor, which is the ratio of the obstacle's shear strength to the shear strength of the adjacent foundation stratum; second, the contact width factor, which is the lateral extension range of the obstacle along the construction axis; and third, the depth overlap factor, which is the ratio of the obstacle's depth to the depth of the TRD-designed trench. The spatial overlap ratio between layers; after standardization, the above three indicators are mapped to "weak / medium / strong / extremely strong" or "point / strip / area" level labels, and combined and mapped through a system-preset cross-rule table. For example, when the strength difference of an obstacle is greater than 4 times, the contact width exceeds 0.8 meters, and the overlap with the construction layer is greater than 70%, the system judges it as extremely strong interference and assigns a cutting interference score range of 0.8 to 1.0; if only some of the three conditions are met, it corresponds to medium-strong or weak interference, and the score range decreases accordingly (0.6-0.8, 0.3-0.5, <0.3). Taking section A1 as an example, its cutting interference score is 0.82 (out of 1.0), and the system judges it (greater than the preset threshold, such as 0.6) as a strong interference section. This evaluation process is executed one by one for all obstacle-affected sections, generating a cutting force interference data list.

[0105] Based on the cutting force interference data, the axis stability risk is determined, and the axis risk data is obtained.

[0106] In one embodiment, the system performs axis stability risk assessment based on the aforementioned cutting force interference data. All sections with cutting interference scores higher than 0.6 are marked as high-risk axis sections. Adjacent risk sections less than 1 meter apart are merged to identify potential continuous risk corridors. For example, the A1 section (isolated rock) at 24.5 to 25.5 meters and the old pile P2 section at 26.1 to 26.9 meters are merged into a single continuous first-level risk section, ranging from 24.5 to 26.9 meters, because the interval between them is less than 1 meter. Sections with scores lower than 0.6, such as the abandoned pipeline area at 48.2 to 49.3 meters, are assessed as medium-risk but are not listed as triggering conditions for borehole layout; they are only recorded for reference. After comprehensive analysis, the system identifies three high-risk axis sections with lengths of 2.4 meters, 3.1 meters, and 1.8 meters, respectively. Each high-risk segment is accompanied by a cutting interference score, labels for major risk sources (such as boulders, old piles, etc.), and corresponding z-axis depth influence range, among other attribute information. The axis risk data is obtained by outputting the projection data of all assessed axes.

[0107] Optionally, the arrangement of the axial stability pilot holes includes:

[0108] S21. Extract risk axis segments based on axis risk data to obtain risk axis segment data;

[0109] In one embodiment, the system performs sliding window analysis on axis risk data to identify several sections where the risk score, although not consistently exceeding the high-risk threshold, exhibits a "rapid rise-slow fall" pattern over a short distance. For example, within the 41.5–44.0 meter axis range, the risk score rapidly rises from 0.48 (above 0.4 and below 0.6 is considered a medium-risk axis section) to 0.62 within a 1.5-meter range, and then gradually falls back to 0.50 within a 2-meter range. Although only local locations within this section meet the high-risk criteria, the system determines that this risk change pattern reflects the impact of potential structural discontinuities or hidden obstacles. Based on this determination, the system extracts the entire 41.5–44.0 meter range as a complete risk axis section, labels its risk type as gradual disturbance risk, and records its corresponding depth concentration interval and risk change slope characteristics. The system combines the high-risk axis sections from the aforementioned axis risk data to obtain risk axis section data.

[0110] S22. Determine the deployment trigger data for the risk axis segment data;

[0111] In one embodiment, the system determines the placement trigger based on a preset pilot hole placement trigger standard for the identified risk axis segment data. This trigger standard includes the following three conditions: first, the length of the risk segment is not less than 1.5 meters; second, the corresponding cutting interference score is not less than 0.6 or is considered a gradual disturbance risk; and third, the overlap ratio between the depth range of the obstacle and the TRD design groove depth is not less than 60%. The system compares and analyzes the three risk axis segments separately, and the results show that all meet the above determination conditions. Therefore, the system confirms that the pilot hole placement operation should be initiated in these three segments and outputs the placement trigger data as: [True, True, True].

[0112] S23. Determine the lateral direction of the pilot hole arrangement based on the arrangement trigger data to obtain the lateral arrangement direction data;

[0113] In one embodiment, after confirming that each risk axis segment meets the triggering conditions for pilot hole placement, the system determines the lateral direction of pilot hole placement for each segment based on the distribution of obstacles and historical construction offset trends. For the 22.8 to 25.6 meter segment, obstacles are mainly concentrated about 1 meter to the right of the wall. To prevent the cutter head from deviating towards the obstacle area, the system determines that a single-sided pilot hole should be placed on the left side. For the 37.2 to 39.4 meter segment, obstacles are symmetrically distributed on both sides. To improve the guiding effect, the system determines that pilot holes need to be placed on both sides simultaneously. For the 51.0 to 52.8 meter segment, the high-strength interlayer is biased to the left side of the wall. Based on this, the system determines that a single-sided pilot hole should be placed on the right side. The lateral placement direction data output by the system are as follows: [left side, both sides, right side].

[0114] S24. Set the parallel relationship of the pilot hole axis direction for the lateral arrangement direction data to obtain the pilot hole parallel setting data;

[0115] In one embodiment, the system precisely sets the orientation relationship between the axis of each pilot hole and the design axis of the cutoff wall. The system arranges all pilot hole axes in the plane at an angle of 2° to 5° to the TRD design axis, forming an intervention path with guiding function. During operation, the system calls the CAD module, using the TRD design axis as a reference, to translate and adjust each pilot hole axis segment. The translation distance is controlled between ±0.5 meters and 1.0 meter, and its direction is slightly deflected. The system ensures that the deflection direction of each pilot hole axis points in the opposite direction to the obstacle's offset trend, thereby guiding it to naturally return to the predetermined axis when the cutter head is deflected by force. The system outputs pilot hole parallel setting data, expressed in the form of pilot hole plane coordinates and corresponding directional angles.

[0116] S25. Determine the lateral offset of the pilot hole based on the TRD cutoff wall design data to obtain the lateral offset data of the pilot hole.

[0117] In one embodiment, the system, considering the actual width of the TRD equipment cutter head (approximately 450 mm) and the designed thickness of the cut-off wall (approximately 650 mm), determines the reasonable lateral offset range for the pilot hole arrangement to be 0.8 to 1.2 meters. Based on the specific distribution of obstacles within the wall cross-section in each high-risk section, the system specifically sets the lateral offset value for each pilot hole segment. In the 22.8 to 25.6 meter segment, since the obstacle is located on the outer right side of the wall, the system sets the lateral offset of the left-side pilot hole to 1.0 meter; in the 37.2 to 39.4 meter segment, the obstacle is symmetrically distributed on both sides, and the system sets the offset of both left and right pilot holes to 0.9 meters; in the 51.0 to 52.8 meter segment, the obstacle is offset to the left side of the wall, therefore the offset of the right-side pilot hole is set to 1.1 meters. The system outputs the following lateral offset data for the pilot holes: [1.0 meter (left side), 0.9 meters (both sides), 1.1 meters (right side)].

[0118] S26. Determine the longitudinal spacing of the pilot holes based on the risk axis section data to obtain the longitudinal spacing data of the pilot holes.

[0119] In one embodiment, the system determines the longitudinal spacing of each pilot hole along the axial direction based on the identified risk axis segment data. To ensure sufficient continuity of the low-resistivity area formed by the pilot holes during construction, the system sets the pilot hole spacing to meet two conditions: first, the overlap rate of the low-resistivity areas between pilot holes is not less than 30%; second, considering the characteristic that the groove-forming advance step length of the TRD equipment is 1 meter, the pilot hole spacing is preferably controlled within 1.5 meters. The specific layout is as follows: In the section from 22.8 to 25.6 meters (total length 2.8 meters), the system deploys 3 pilot holes with a spacing between 1.0 and 1.2 meters to ensure complete coverage and enhance guidance continuity; in the section from 37.2 to 39.4 meters (total length 2.2 meters), due to the symmetrical layout on both sides, the system deploys 2 pilot holes on each side, staggered left and right, with a pilot hole spacing of approximately 1.1 meters, forming a symmetrical disturbance guidance path; in the section from 51.0 to 52.8 meters (total length 1.8 meters), the system deploys 2 pilot holes with a spacing of approximately 1.0 meter to achieve effective coverage of this short section. The longitudinal layout spacing data output by the system records the coordinate position of each pilot hole and its spacing relationship with adjacent pilot holes, forming a structured data table.

[0120] S27. Integrate the lateral arrangement direction data, the pilot hole parallel setting data, the pilot hole lateral offset data, and the pilot hole longitudinal arrangement spacing data to obtain the pilot hole arrangement data.

[0121] In one embodiment, the system integrates various pre-generated borehole parameter data, including lateral arrangement direction data, parallel setting data for borehole axis orientation, lateral offset data, and longitudinal spacing data. The system merges these data to construct unified borehole arrangement data. This dataset uses three-dimensional spatial coordinates as its core, combined with key fields such as borehole number, arrangement method (e.g., single-sided or double-sided), specific offset value, and orientation angle for a structured representation. The integrated borehole arrangement data is imported into the construction drawing module, generating corresponding layout diagrams and location annotations, facilitating visual viewing and on-site verification by construction personnel. The system can automatically generate construction layout instructions based on this data to guide the precise positioning and deployment of borehole equipment.

[0122] Optionally, the aperture mechanical matching setting includes:

[0123] S31. Determine the pilot hole functional section based on the pilot hole layout data to obtain pilot hole functional section data;

[0124] In one embodiment, based on the borehole layout data generated in step S2, the system determined the borehole action zone for the TRD cutoff wall axial section from 25 meters to 27.8 meters in a certain project. Within this section, the system has deployed three sets of boreholes on the left side, numbered H01 to H03. Combining the risk axis range (2.8 meters in length) corresponding to this section and the trenching step length per meter of the TRD equipment, the system sets the action range of the boreholes in the axial direction to 25.0 to 27.8 meters. In the depth direction, based on the preliminary obstacle analysis results showing that the main disturbance layer is concentrated between 10 and 17 meters, the system sets the vertical action range of the boreholes to 9.5 to 17.5 meters. In the lateral direction, using the TRD design axis as a reference and referring to the pre-set offset value, the left offset is confirmed to be 1.0 meter. The system defines the borehole action range as several three-dimensional rectangular spatial blocks, covering the combined range of the axial direction, depth direction, and lateral direction, forming the borehole action zone data.

[0125] S32. Based on the data of the pilot hole action section, set the effective action depth matching of the pilot hole to obtain the action depth matching data;

[0126] In one embodiment, the system, based on the generated pilot borehole action zone data, calls upon in-situ site test results to match and set the effective action depth of the pilot boreholes. Tests revealed that within a depth range of 9.5 to 17.5 meters, there were localized gravel interlayers (11 to 14.2 meters) and old pile root structures (15.6 to 16.8 meters). The standard penetration value (N value) of the soil in this section was as high as 45, exhibiting high impedance characteristics, and was identified as a critical area most likely to cause cutter head deviation during construction. The system added a 0.5-meter buffer layer above and below the identified high impedance area, setting the effective action depth to 10.5 to 17.3 meters. This depth range was determined as the target guiding depth for each group of pilot boreholes within this risk zone. The system outputs action depth matching data.

[0127] S33. Set the low resistance characteristic matching of the aperture diameter to the working depth matching data to obtain the aperture range data.

[0128] In one embodiment, the system combines the aforementioned determined depth matching data of the pilot hole to set the low-resistivity characteristic of the pilot hole diameter. According to the shear strength analysis of the strata in this depth range, the maximum shear strength can reach 320 kPa, while the average shear strength of the adjacent undisturbed soil is about 60 kPa. There is a significant difference between the two, which belongs to the transition zone between high impedance and medium disturbance capability. High impedance refers to the significant cutting difficulty during the advance of the TRD cutter head, which often corresponds to hard obstacles or high-strength interlayers (such as boulders, old piles, dense concrete, etc.). Medium impedance corresponds to materials that can be disturbed but whose strength is still higher than that of soft soil. Although they will not break immediately, they can cause structural loosening under continuous disturbance or repeated shearing. Low impedance refers to the material state that is easy to disturb and break, has low cutting resistance, and can provide the cutter head with an offset return path, which often corresponds to weak undisturbed soil or grouting modified materials. The system sets the low-resistance level of the pilot holes in this area to medium-low strength perturbable (belonging to the medium impedance level, between high and low impedance). This low-resistance level does not represent the absolute strength level of the material itself, but rather emphasizes its perturbability, destructibility, and ability to guide the advancement path relative to high-strength obstacles. Based on the empirical matching relationship between aperture and perturbation strength in a preset internal database, the system determines that a suitable aperture range should meet the following conditions: minimum aperture not less than 130 mm; maximum aperture not exceeding 160 mm. After evaluation, the system uniformly sets the aperture of the three pilot holes (numbered H01 to H03) in this section to 150 mm, satisfying both the perturbation strength requirements and considering construction controllability and structural integrity. The system outputs the aperture range data.

[0129] S34. Based on the axis risk data, perform mechanical synergy analysis on the pilot hole arrangement data to obtain the pilot hole relationship data;

[0130] In one embodiment, the system analyzed the mechanical synergy between the three apertures (H01 to H03) in the aperture layout data. The three apertures are positioned along the axial direction as follows: H01 at 25.2 meters, H02 at 26.0 meters, and H03 at 27.0 meters. The distance between any adjacent apertures is less than 1.5 meters, meeting the basic spacing requirements for continuous arrangement of low-resistivity channels (continuous or semi-continuous regions formed spatially by the low-resistivity disturbance areas of multiple adjacent apertures). The system references / presets the diffusion radius of the low-resistivity region (approximately 0.9 meters) to evaluate the overlap of the disturbance range between the apertures. The analysis results show that the low-resistivity influence areas between the three apertures have an overlap of approximately 25% to 30%, indicating good mechanical intervention coherence between the apertures. The system analyzes a collaborative relationship model. The model's inputs primarily include the spatial arrangement parameters of the pilot holes (such as axial position, spacing, and offset), the equivalent influence range of the low-resistivity region of the pilot holes, and the possible offset state of the cutting head. The intermediate analysis focuses on determining the spatial coverage and superposition relationships of the disturbance regions of each pilot hole, and whether these superposition relationships can form a continuous low-resistivity guiding path. For example, the system determines whether adjacent pilot hole disturbance regions have continuous coverage in the axial direction, and whether a disturbance band without obvious high-blocking points is formed within the path range where the cutting head may offset. When the disturbance regions of multiple pilot holes form in space... When the holes are continuously or semi-continuously distributed, and their overlapping range can cover the path length required for the tool head's offset return, the system determines that the arrangement meets the conditions for forming a continuous low-resistance guide path. Its output includes whether the pilot holes have a synergistic effect, whether the low-resistance path can be closed, and a qualitative or semi-quantitative assessment of the tool head's offset return capability. A simulation of the TRD tool head's return path under offset conditions was performed. The results show that the current pilot hole arrangement can provide sufficient mechanical guidance when the tool head is offset by approximately 4 cm, meeting the conditions for achieving low-resistance path closure and helping to guide the tool head to naturally return to the design axis center. The system outputs data on the relationship between the pilot holes.

[0131] S35. Set the pilot hole filling status based on the aperture range data to obtain pilot hole filling status data;

[0132] In one embodiment, the system determines, based on the aforementioned borehole diameter range data and construction objectives, that the borehole filling state should meet the requirements of being disturbable, destructible, and non-stress-bearing structural characteristics. A mixture of lightweight bentonite and quartz sand is selected as the filling material to achieve controllable fracturing and guiding functions during construction disturbance. Specifically, the dry density of the filling material is controlled at 1.25 grams per cubic centimeter, and the moisture content is maintained between 40% and 45%, ensuring good fluidity after injection. This achieves a self-compacting filling effect without forming structural consolidation, thus maintaining a low-strength, disturbable performance state. During construction, for boreholes numbered H01 to H03, the filling material is injected to the preset effective depth range according to the above parameters, and natural consolidation is completed within 24 hours after filling, ensuring that the construction progress matches the material performance. The system outputs borehole filling state data including the type of material used, slurry ratio parameters, and the injection depth curve corresponding to each borehole.

[0133] S36. Based on the working depth matching data, aperture range data, inter-pipe relationship data, and pilot hole filling state data, perform pilot hole mechanical matching verification to obtain pilot hole mechanical matching data.

[0134] In one embodiment, the system verifies the overall mechanical matching of the pilot hole arrangement based on pre-defined data on the working depth matching, aperture range, inter-pilot coordination relationship, and pilot hole filling status. This verification is implemented using an internal structural finite element module (based on secondary development of the ABAQUS platform) to simulate the force evolution process of the TRD cutter head in a complex obstacle environment. In the simulation, the system sets the TRD cutter head advance rate to 0.6 meters per minute and simultaneously constructs a low-resistance path consisting of laterally obstructed obstacles, introducing disturbance points (such as boulders), and the pre-defined pilot hole area, evaluating its guiding effect on the cutter head's trajectory. Simulation results show that under the most unfavorable conditions, the maximum deviation of the cutter head is 4.2 centimeters, and it subsequently successfully returns to the design axis center within a 1.1-meter advance range, indicating that the guiding path has a strong correction capability. The system also evaluates the structural integrity of the guiding path, scoring 86.5 points (out of 100), and is therefore classified as a high reliability level. Based on the above results, the system outputs qualified mechanical matching data for the boreholes, indicating that the current borehole scheme has good mechanical guiding performance under structural disturbance environment and meets the implementation requirements of the next stage of non-obstacle clearing treatment.

[0135] Optionally, the low-resistance characteristic matching setting of the aperture includes:

[0136] Formation cutting features are extracted based on the depth-of-action matching data to obtain formation cutting feature data;

[0137] In one embodiment, for a TRD cutoff wall project, the system extracts and analyzes the cutting characteristics of the strata based on the previously determined effective depth range of the pilot borehole (10.5 meters to 17.3 meters). The system calls up geological exploration borehole records, standard penetration test results, and construction test borehole feedback data within this depth range to organize and classify key cutting-related parameters. In the 11.0 to 14.0 meter range, a typical pebble interlayer is observed, with standard penetration test (N value) reaching 38 to 45, indicating that this layer has high-resistance cutting characteristics. In the 15.5 to 16.8 meter range, residual old pile concrete is found, and the equipment torque increases significantly during on-site drilling, suggesting the presence of structurally strong interference in this area. Meanwhile, the adjacent undisturbed soil layer has a relatively low shear strength, averaging approximately 60 kPa, indicating its susceptibility to disturbance. The system structures the aforementioned differences, extracting indicators such as the cutting resistance mutation ratio, hardness difference coefficient, and depth overlap. These are then compiled into a dataset of formation cutting characteristics corresponding to the 10.5-meter to 17.3-meter depth range. Regarding the cutting resistance mutation ratio, the system uses the average cutting resistance characteristics of the undisturbed soil layer within the depth range as a benchmark. It compares and analyzes phenomena such as torque increases and penetration resistance anomalies exhibited by high-strength formations like gravel interlayers and concrete residues during drilling or test borehole construction. When a local formation exhibits a significantly higher resistance response than the benchmark soil layer under the same or similar construction conditions, the system determines that a cutting resistance mutation exists at that location. The cutting resistance mutation ratio is formed by the amplification ratio of this mutation to the benchmark value. As for the definition of the hardness difference coefficient, the system comprehensively... The system combines standard penetration test results, formation type, and drilling feedback information to compare the equivalent hardness of different formations within the operating depth range. Using the average shear strength or penetration characteristics of the undisturbed soil as a reference value, the system normalizes and compares the shear strength or penetration resistance corresponding to high-strength structures such as gravel interlayers and concrete residues, thus forming a hardness difference coefficient reflecting the degree of hardness difference between the high-strength formation and the surrounding soil. In the extraction of depth overlap, the system overlays the vertical distribution range of the high-strength cutting interference formation with the effective operating depth range of the borehole, statistically analyzing the overlap in the depth direction. When the high-strength formation occupies a large proportion within the effective operating depth of the borehole, the system determines that the interference has a direct impact on the TRD trenching process, and the proportion of the overlap depth to the operating depth range is used as the depth overlap index.

[0138] The low-resistance characteristics of the pilot hole are determined based on the formation cutting characteristic data, and the low-resistance characteristic data of the pilot hole are obtained.

[0139] In one embodiment, the system determines the required low-resistance characteristics of the target pilot hole based on the aforementioned stratum cutting characteristic data. Considering the presence of pebble interlayers and residual concrete structures within the operating depth range, whose shear strength is much higher than that of adjacent undisturbed soil layers, the TRD cutter head will face significant differences in cutting resistance during construction. The system sets the target low-resistance characteristics of this pilot hole to a medium-level perturbed low-resistance. This type of low-resistance characteristic exhibits the following characteristics: firstly, it can form a resistance gradient relative to the high-strength stratum within the pilot hole area, providing a return path for the cutter head after deviation; secondly, when the TRD cutter head contacts disturbance, the filling material can achieve structural fracture or re-disturbance, thus not constituting an obstacle to advancement; and thirdly, the pilot hole does not possess stable bearing capacity after filling, nor does it form permanent cavities or mechanical abrupt change zones, ensuring the continuity and safety of the wall structure. The system expresses the above low-resistance characteristics in a parameterized form, setting the corresponding low-resistance level coefficient range to 0.45 to 0.55, and outputs the low-resistance characteristic data of the pilot hole.

[0140] Based on the low-resistivity characteristic data of the pilot hole, the pilot hole diameter relationship is constructed to obtain the pilot hole diameter relationship data;

[0141] In one embodiment, the system constructs a correlation between pore size and low-resistance characteristics based on existing historical engineering databases and field test data. This correlation is used to evaluate the influence of the pore size on the low-resistance effect under the same filling material and working depth conditions. Appropriately increasing the pore size can effectively reduce local cutting resistance and enhance disturbance guidance capability; however, when the pore size exceeds a certain range, its gain effect on axial stability tends to saturate, and excessively large pore sizes may weaken the wall structure. Combining the low-resistance level range (0.45~0.55) set in this embodiment, the system reverse-engineers the matching pore size range. The results show that when the pore size is less than 120 mm, the low-resistance effect is insufficient and cannot meet the guidance requirements; when the pore size is between 130 and 160 mm, it highly matches the set low-resistance characteristics and is the preferred range; while when the pore size exceeds 170 mm, although the resistance is reduced, it has an adverse effect on the overall stability and continuity of the seepage barrier wall. The system encapsulates the above evaluation results into pore size relationship data.

[0142] Based on the data on the arrangement of the pilot holes and the relationship between the pilot hole diameters, upper and lower limits are set to obtain the range of hole diameters.

[0143] In one embodiment, the system, based on the obtained data on the relationship between the borehole diameters and the borehole layout data, sets upper and lower limits for the borehole diameter values. Considering a lateral offset of 1.0 meter for the boreholes, it ensures that the boreholes do not enter the trenching area of ​​the TRD cutoff wall during construction, avoiding penetrating weakening of the wall structure. The longitudinal spacing between adjacent boreholes is set at 1.1 meters; if the borehole diameter is too large, it will lead to excessive overlap between low-resistivity disturbance zones, thereby reducing the directionality and controllability of the disturbance. This is combined with the structural parameters of a 650 mm thick TRD-designed wall. After considering the above spatial layout and structural integrity constraints, the system sets the lower limit of the borehole diameter to 130 mm and the upper limit to 155 mm. Within this range, the system determines that the borehole diameter used in this embodiment is 150 mm, which satisfies both disturbance guidance performance and structural safety control requirements. This setting result serves as the borehole diameter range data.

[0144] Optionally, the non-obstruction clearing process includes:

[0145] The non-obstacle-clearing target confirmation was performed on the mechanical matching data of the pilot hole to obtain the non-obstacle-clearing target data;

[0146] In one embodiment, for the three sets of pilot holes (H01–H03) deployed in the axial segment from 25 meters to 28 meters, the system confirms the non-obstacle-clearing target based on the aforementioned pilot hole mechanical matching data. Analysis results show that the pilot holes in this section need to fulfill the following functions during construction: first, to alleviate the sudden increase in force on the TRD cutter head when traversing obstacle areas, reducing cutting resistance fluctuations; second, to provide a locally perturbed path channel, guiding the cutter head to naturally return to the design axis after deviation. Based on this, the system summarizes that the core mechanical functions required for the pilot holes in this section are force redistribution and deviation induction. Therefore, the pilot holes must maintain non-load-bearing, perturbed, and non-permanent structural properties throughout the construction period and before and after, meaning they cannot form stable structural supports, nor should they affect guiding performance due to excessive consolidation. Based on the axis risk data, the system identifies constraints in this section, including non-removable obstacles, high cutting risk, and low visual interference. This strengthens the control requirements for the borehole material and structural morphology. Specifically, when the risk source labels in the axis risk data are existing structural remnants such as "isolated rocks," "old piles," and "broken piles," and the corresponding depth range coincides with the TRD design trench depth, the system determines that these obstacles are existing obstacles that are difficult or unsuitable to remove during construction, thus indicating that the obstacles are non-removable. The cutting interference score reaches a high-risk level, reflecting a sudden increase in cutting resistance and uneven force distribution during the cutter head advancement process. Based on this, the system determines that this section has high cutting risk construction characteristics. Since the axis risk data is generated based on axis projection and cutting force interference analysis, its risk assessment does not rely on real-time visual observation or manual monitoring results, but rather on geological survey and historical structural information. Therefore, the system concludes that this type of high-risk section is difficult to effectively intervene through visualization during construction and falls under the category of low visual interference. The system confirms that the non-obstacle-clearing target for this section should be that the pilot hole maintains a low density, low stiffness, and is susceptible to damage by the cutter head throughout the construction process and before TRD trenching, and should not form a complete closed body or high-strength support structure. This non-obstacle-clearing target is converted into structural property boundary conditions by the system and used as non-obstacle-clearing target data.

[0147] Based on the non-obstruction removal target, the hole processing method is selected, and the hole processing method data is obtained;

[0148] In one embodiment, for the aforementioned confirmed non-obstruction-clearing target data, the system calls a preset borehole construction parameter library for matching analysis to select a borehole treatment method that meets the requirements of being disturbable, unstable, and non-load-bearing. The goal is to ensure that the filler has good destructibility and mechanical response characteristics during construction, while maintaining sufficient construction convenience and material controllability. For example, in terms of filler material, a lightweight bentonite-quartz sand mixture is selected as the main injection medium. Its proportions are 12% bentonite, 60% quartz sand, and the remainder is water and a small amount of rheology modifier to adjust fluidity and consolidation speed. The construction method adopts self-flowing grouting combined with soft plug sealing, without any form of mechanical compaction to avoid the formation of a dense structure in the filler. In terms of mechanical properties, the 7-day shear strength of the filler material is less than 30 kPa, and the breaking modulus is about 20 MPa, belonging to a non-load-bearing, easily disturbed material system; the bulk density after filling is about 1.28 g / cm³, meeting the low density requirement. The system outputs this scheme as the borehole treatment method data.

[0149] Mechanical control simulation was performed on the data of the hole processing method to obtain mechanical control data;

[0150] In one embodiment, the system constructs a mechanical simulation of the interaction between the cutter head and the filling pilot hole region during the TRD grooving process based on the selected pilot hole treatment data, and conducts targeted mechanical control simulations. This simulation is performed through a pilot hole mechanics simulation module, enabling dynamic evolution analysis of the cutter head advancement, obstacle interference, and filler response processes. The simulation settings are as follows: the TRD cutter head advancement rate is 0.6 meters per minute, the shear strength of the obstacle is set to 350 kPa, the shear strength of the pilot hole filling material is 25 to 30 kPa, and the contact time window between the cutter head and the filling area is controlled between 1.2 and 1.6 seconds. The system simulates the force state and disturbance response process of the cutter head when it traverses the filling pilot hole region. Simulation results show that when the cutter head enters the pilot hole filling region, the filler can achieve local fracture within approximately 1.1 seconds, forming an effective disturbance channel; the offset force of the cutter head during this process decreases by approximately 32% compared to the untreated area, reducing cutting fluctuations. Meanwhile, the infill material did not cause abnormal displacement of the opposite side of the wall structure during the rupture process, maintaining axial symmetry and wall stability. The simulation also showed that the continuity of the low-resistance disturbance channel could be maintained up to 90% of the trench width, meeting the continuity requirements of the trenching guidance effect. The system outputs the simulation evaluation results as mechanical control data.

[0151] In terms of module structure, the borehole mechanics simulation module includes at least a geometric modeling sub-unit, a material property modeling sub-unit, a boundary and working condition setting sub-unit, and a mechanical response solving sub-unit. The geometric modeling sub-unit is used to construct a three-dimensional or quasi-three-dimensional spatial model containing the TRD cutter head, the designed groove region, obstacles, and the borehole filling area. The material property modeling sub-unit is used to assign corresponding mechanical parameters to different regions, including the shear strength, deformation characteristics, and failure mode of the undisturbed soil, hard obstacles, and borehole filling material. The boundary and working condition setting sub-unit is used to load the cutter head's advance direction, advance rate, contact sequence, and constraint boundary conditions. The mechanical response solving sub-unit is used to calculate the stress evolution, structural failure, and force transfer in each region during the cutter head's advance. In the specific construction process, the system generates a spatial model containing the location, diameter, and filling range of the pilot holes based on the pilot hole layout data and pilot hole processing data, and embeds this model into the stratum model corresponding to the TRD trenching path; the system sets the filling area as a low-strength, destructible material area based on the pilot hole processing data, and its mechanical parameters are significantly different from the surrounding undisturbed soil and obstacles; the system loads the TRD cutter head propulsion condition, and constructs the force boundary environment by setting the propulsion rate, contact time window, and obstacle shear strength, etc.; the mechanical response solving sub-unit performs time-series calculations on the entire process of cutter head propulsion to obtain the dynamic evolution results of filler fracture, disturbance channel formation, and cutter head force changes.

[0152] Based on the mechanical control data, the low resistance characteristics of the pilot hole are maintained and verified, and the non-obstruction data of the pilot hole is obtained.

[0153] In one embodiment, the system verifies the maintenance of low-resistivity characteristics in the pilot hole area during the TRD trenching process based on the aforementioned mechanical control data, ensuring that it meets the non-obstacle-clearing design objectives. The verification includes the following three aspects: 1. In terms of perturbability verification, simulation results show that when the pilot hole filler is contacted and disturbed by the TRD cutter head, it can undergo local rupture within a short time, effectively releasing stress concentration within the filler area and exhibiting good failure response characteristics. 2. In terms of impedance difference verification, simulation data shows that the force resistance of the filler area is reduced by approximately 65% ​​compared to the surrounding undisturbed soil, and the cutting load shows a clear redistribution trend, providing a relatively stable guiding channel for the cutter head. 3. In terms of mechanical target consistency judgment, after entering the pilot hole disturbance zone, the cutter head shows a tendency to return to the design axis, without forced pullback, jamming, or increased deviation, indicating that the structure is stable and effective. Through the consistency verification of the above three indicators, the system confirms that the current pilot hole treatment method can maintain the preset low-resistivity characteristics for a long time in actual mechanical response, and will not form consolidation obstacles or structural deviations, meeting the non-obstacle-clearing construction objective requirements. The system outputs the evaluation results as unobstructed hole data.

[0154] Optionally, the non-obstacle clearing target confirmation includes:

[0155] Based on the mechanical matching data of the pilot hole, mechanical functional processing of the pilot hole is performed to obtain the mechanical functional data of the pilot hole.

[0156] In one embodiment, considering the geological conditions of overlapping boulders and broken piles within the 25.0 to 27.8 meter axis section, the system performed mechanical function identification and processing on the three sets of pilot holes (numbered H01–H03) on the left side of this section. Based on the generated pilot hole mechanical matching data, the system analysis revealed a significant offset trend in this section during the TRD cutterhead advancement process, with obvious uneven stress characteristics and a stress unevenness coefficient reaching 0.62. Simulation results also showed that the surrounding soil in this area would form a temporary stress release zone after disturbance, providing potential conditions for the guided return after cutterhead offset. Under the premise that the pilot holes remain in a perturbed state, the return probability after cutterhead offset is significantly improved, and the mechanical path exhibits a stable self-correction capability. Therefore, the system classifies the mechanical function of the pilot hole in this section as force redistribution type and offset regression induced type. This means that this type of pilot hole needs to buffer and transfer the force when the tool head experiences a sudden increase in local resistance. Simultaneously, after offset occurs, it should guide the tool head to naturally return to its design axis via a low-resistance path. The force redistribution type pilot hole refers to the pilot hole area that, when the TRD tool head enters the high-resistance obstacle influence zone and experiences a sudden increase in local cutting resistance, can preferentially undergo disturbance or fracture due to its low-strength, destructible structural characteristics. This alters the original force transmission mode of the high-resistance path, changing the cutting force from a concentrated state to a dispersed state, reducing the force difference on both sides of the tool head, and playing a role in buffering sudden load changes and redistributing cutting force. This type of pilot hole focuses on suppressing further amplification of force imbalance. The offset regression induced type pilot hole refers to the pilot hole area that, when the tool head has already experienced... After a certain degree of axial offset, the low-resistance disturbance region formed by the pilot hole can create a relatively continuous resistance gradient in space, guiding the cutter head to move naturally along the low-resistance direction, gradually returning its cutting path to the vicinity of the design axis. This type of pilot hole focuses on providing passive correction capability under the condition that offset has occurred, without relying on active control or external adjustment. Optionally, depending on the axial risk characteristics and the arrangement of the pilot holes, the mechanical function of the pilot hole can also be categorized as a disturbance buffer type or a unilateral load reduction type. The disturbance buffer type is mainly used in high-frequency micro-disturbance sections, improving the stability of the groove by reducing continuous small-amplitude resistance fluctuations. The unilateral load reduction type is mainly for situations where obstacles are significantly biased to one side, weakening the load tendency through a unilateral low-resistance structure. However, in this embodiment, the pilot hole mainly undertakes the combined function of force redistribution and offset return induction. This result is output as pilot hole mechanical function data and serves as the structural property constraint condition that this type of pilot hole must meet during construction.

[0157] Based on the axis risk data, the state retention data of the pilot hole mechanical function data is determined to obtain the state retention data.

[0158] In one embodiment, the system judges and sets the structural state maintenance requirements for the pilot holes throughout the entire construction process based on the mechanical function data and axis risk data of the pilot holes. This axis section is an extended area resulting from the continuous merging of multiple risk sections, containing inaccessible obstacles such as isolated boulders and broken piles. Furthermore, due to construction limitations, real-time monitoring during trenching is difficult to implement. To ensure that the TRD cutter head can successfully complete disturbance release and path guidance during its passage through this high-risk section, the system explicitly requires that the three sets of pilot holes numbered H01 to H03 must complete low-resistance preparation work before the trenching operation begins and maintain a perturbable structural state throughout the entire cutter head advancement process. The filler inside the pilot hole must not form a temporary strong support structure, nor should it exhibit self-healing closure due to consolidation or rheological effects, to avoid interfering with or deviating from the cutting head's advance. The low-resistance preparation work refers to measures taken before the TRD trenching operation to ensure that the pilot hole area possesses low strength, low density, and permeable mechanical properties in its initial state, through pilot hole layout, diameter and depth control, filler material selection, and injection method settings. The system outputs this judgment result as state-maintaining data, explicitly stating that the structural properties of the pilot hole must remain stable and controllable throughout the entire trenching window.

[0159] Based on the state-preserving data, non-obstacle-clearing constraints are applied to obtain non-obstacle-clearing constraint data;

[0160] In one embodiment, the system, in conjunction with the aforementioned state-maintaining data, clarifies the non-obstacle-clearing structural constraints that the pilot hole must meet throughout the entire construction cycle, ensuring its continuous function as a disturbable, non-load-bearing component during TRD trenching. The system sets the following non-obstacle-clearing constraints: It explicitly prohibits any form of mechanical obstacle clearing, including but not limited to drilling through obstacles or backfilling and solidifying, to avoid interfering with existing risky structures or causing unnecessary structural abrupt changes; regarding filling materials, the use of high-strength grouting materials, such as cement grout or silicate grout, is strictly prohibited to prevent excessive hardening of the filler during trenching; restrictions are placed on the mechanical parameters of the filler: its shear strength must not exceed 30 kPa, and its density must be controlled below 1.35 g / cm³ to maintain a low-strength, easily disturbed state; after construction, secondary compaction of the filling area is not permitted, nor is the formation of a continuous encapsulation structure or cemented shell, ensuring that the filler can be broken and dispersed under the disturbance of the TRD cutter head. These constraints are encapsulated and output by the system as non-obstacle-clearing constraint data.

[0161] The target structure of the pilot hole is determined based on the non-obstacle clearing constraint data, and the target structure data of the pilot hole is obtained.

[0162] In one embodiment, the system constructs and determines the target structural model that the pilot hole should achieve based on the aforementioned non-obstacle-clearing constraint data to meet the functional requirements of "disturbanceable, non-load-bearing, and non-consolidated" during the TRD trenching process. This target structure mainly includes the following characteristics: In terms of geometry, the pilot hole structure is set as an approximately cylindrical, non-closed body with a diameter of 150 mm and a depth of 7 m, ensuring that it meets the requirements for constructing a disturbance channel without forming a complete encapsulation structure. In terms of material composition, the pilot hole is filled with a loose, lightweight material with a high porosity (not less than 28%) to ensure good breakage and diffusion properties under stress disturbance. In terms of mechanical behavior, the filling material should be able to structurally break within 1.2 seconds under the shearing disturbance of the TRD cutter head, forming a low-resistance disturbance channel. Simultaneously, the breaking process should not cause hole wall peeling or structural collapse to avoid negatively impacting the surrounding wall structure. Based on the above settings, the system outputs the target structure data of the borehole, expressed in the form of a set of structural parameters, including elements such as borehole diameter, depth, filling density, porosity, and fracture response time.

[0163] Based on the mechanical function data of the pilot hole and the target structure data of the pilot hole, a joint verification was performed to obtain the non-obstacle clearing target data.

[0164] In one embodiment, the system performs co-verification of the pre-generated mechanical functional data and target structural data of the pilot hole to verify whether the pilot hole scheme meets the requirements of non-obstacle-clearing construction. The verification content covers performance indicators, including functional duration / functional retention, shear response, structural stability, and disturbance capability. In terms of functional retention, the filler can maintain a disturbable state continuously during the trenching window period, meeting the requirement of a mechanical functional maintenance time of not less than 3 minutes; in terms of shear response, the material failure trigger threshold is controlled within 30 kPa, ensuring that structural fracture can occur rapidly under the action of the cutter head; in terms of structural stability, the filler does not have a tendency to consolidate and compact, and always maintains a loose state; in terms of disturbance capability, the shear strength difference between the filler area and the surrounding undisturbed soil exceeds 60%, possessing low-resistance disturbance capability. The low-resistance disturbance capability refers to the fact that the pilot hole filler, under the contact or adjacent cutting action of the TRD cutter head, can undergo structural damage or morphological rearrangement with lower cutting resistance compared to the surrounding undisturbed soil or hard obstacles, thereby forming a disturbance channel with reduced local resistance. This disturbance channel lacks load-bearing or stabilizing support functions, but it can quickly alter the force distribution around the cutter head, shifting cutting resistance from high-resistance to low-resistance regions, thereby guiding a favorable adjustment of the cutter head's movement path. Through item-by-item comparison of the above indicators, the system confirms that the current pilot hole configuration, under construction conditions without obstacle removal or active intervention, can effectively support path guidance and mechanical stability control of the TRD cutter head in high-risk formations by constructing a target structure with low resistance and disturbance properties. This judgment result is output as non-obstacle-clearing target data.

[0165] Optionally, the TRD trenching passive axis guidance includes:

[0166] S41. Based on the non-obstruction data of the pilot hole, perform TRD trenching operation section matching to obtain operation section data;

[0167] In one embodiment, the system performs matching analysis on the TRD trenching operation section based on the confirmed pilot hole non-obstruction data. Within the 25.0 to 27.8 meter axial section, three sets of pilot holes (numbered H01–H03) have been installed, each with a diameter of 150 mm. The filling material is a disturbable bentonite-quartz sand mixture, whose structural properties have been confirmed to be breakable, low-resistivity, and non-load-bearing, meeting the non-obstruction target requirements. According to the overall TRD construction plan, the project adopts a west-to-east advancement strategy. The system divides the daily trenching progress into 5-meter segments and generates a construction segment progress table according to the construction rhythm. The 25.0 to 27.8 meter segment is planned as the third operation segment and included in the daily trenching operation scope. The system matches this operation segment with the pilot hole layout and non-obstruction parameters, confirming that this segment is a TRD trenching segment with pilot hole guidance function. When outputting data for the work section, the system simultaneously loads information such as the low-resistivity structural parameters, layout location, disturbance depth, and mechanical response characteristics of the pilot holes within that section.

[0168] S42. Based on the data of the working section, activate the mechanical response of the low resistance region of the pilot hole and process the uneven force state of the cutter head to obtain the data of the low resistance region of the pilot hole and the data of uneven force.

[0169] In one embodiment, when the TRD device advanced to the 25.2-meter axial position, the system monitored the following abnormal force characteristics in real time: the propulsion torque on the left side of the cutter head increased by approximately 22%, the propulsion speed on the right side was slightly higher, and the thrust difference reached 8%. This force pattern represents a typical performance of the initial stage of cutter head offset due to obstacle contact. Based on this, the system determined that the cutter head was currently in a state of unbalanced force and had a significant offset trend. At the same time, the cutter head's propulsion direction precisely cut into the area where the deployed left-side pilot hole H02 was located. This pilot hole was filled with a low-strength bentonite-mortar mixture with a shear strength of less than 30 kPa, exhibiting good disturbance response performance. Under the disturbance of the cutter head, the pilot hole area rapidly fractured, forming a disturbance fracture zone with a width of approximately 250 mm. The system measured that the effective shear resistance in this area decreased by more than 65%, successfully constructing a low-resistance mechanical guidance path and effectively suppressing the cutter head offset trend. The system identified this fracture zone as a low-resistance region of the pilot hole and recorded its response time window as 1.1 to 2.0 seconds. The corresponding tool head response behavior in this process is labeled as the result of the unbalanced force state processing, and output as low resistance region data and unbalanced force data for the pilot hole, respectively.

[0170] S43. Based on the low-resistance region data of the pilot hole and the data of uneven force distribution, the force redistribution is performed to obtain the force redistribution data;

[0171] In one embodiment, after the TRD cutter head advances into the previously constructed low-resistance pilot hole area, the system collects and analyzes a series of construction parameter changes in real time. Monitoring data shows that the advancing torque on both sides of the cutter head tends to balance, with the difference between the left and right sides reduced to within 5%; the original offset trend of the cutter head is significantly weakened, and its return angle is controlled within 1.5 degrees, indicating that the offset has been effectively corrected; simultaneously, the groove width remains within the design value of 450 mm ± 8 mm, without excessive width or groove deviation. The system calculates the change in the cutting force of the cutter head: the disturbance zone formed by the fracture of the pilot hole filler under stress changes the local stress path. The original force direction tending towards offset shifts, and the cutter head no longer escapes along the original offset direction, but naturally transitions back to the design axis center area under the guidance of the low-resistance disturbance path. The entire process does not rely on manual intervention or real-time equipment adjustment, and is entirely based on the pre-set pilot hole structure and the mechanical response during construction. The system defines the regression process of the cutter head behavior as a force redistribution mechanism, and encapsulates its path and response process in a structured manner, outputting force redistribution data.

[0172] S44. Passive axis regression is performed based on the force redistribution data to obtain TRD trenching guidance data.

[0173] In one embodiment, the system recorded and analyzed the entire process of the cutter head trajectory changes within the 25.0 to 27.2 meter advance range of the TRD equipment. In this section, the cutter head initially exhibited a significant leftward deviation of 4.3 cm; as it advanced to the 26.0 meter position, the deviation gradually decreased to 1.5 cm; before exiting the section, the cutter head returned to within ±0.8 cm of the axis center and maintained a small oscillation within a reasonable range, without any further significant deviation. This process did not rely on any manual intervention or real-time adjustments. The system confirmed through data comparison that the gradual return of the cutter head path was entirely attributed to the low-resistance channel response constructed by the pre-installed pilot hole structure. This structure forms a disturbance fracture zone when the cutter head is subjected to uneven force, guiding the redistribution of the cutting path and achieving passive correction of the cutter head deviation trend. The groove formation quality of this section was good, with uniform groove wall thickness, and no construction defects such as tearing, reverse shearing, or double grooves were found. The structural integrity and stability met the design requirements. Based on this, the system marks the advancement section as passively guided and outputs the TRD trenching guidance data for that section, serving as an engineering verification result of the successful implementation of the low-resistivity disturbance guidance mechanism. It can also provide data support and strategy reference for TRD construction under similar geological conditions.

[0174] Optionally, this application also provides a combined construction system for trenching and pre-drilling and TRD cutoff wall, used to perform the combined construction method of trenching and pre-drilling and TRD cutoff wall as described above, wherein the combined construction system for trenching and pre-drilling and TRD cutoff wall includes:

[0175] The axis risk segmentation module is used to acquire TRD cutoff wall design data and obtain obstacle data based on the TRD cutoff wall design data; and to perform axis risk segmentation based on the obstacle data to obtain axis risk data.

[0176] The axis stability pilot hole arrangement module is used to arrange axis stability pilot holes based on axis risk data to obtain pilot hole arrangement data.

[0177] The non-obstacle clearing module is used to set the mechanical matching of the pilot holes based on the pilot hole layout data to obtain the pilot hole mechanical matching data; and to perform non-obstacle clearing processing on the pilot hole mechanical matching data to obtain the pilot hole non-obstacle clearing data.

[0178] The TRD trenching passive axis guidance module is used to perform TRD trenching passive axis guidance based on the non-obstruction data of the pilot hole, and obtain TRD trenching guidance data.

Claims

1. A construction method combining trenching and pre-drilling with a TRD (Tunnel Diversion) anti-seepage wall, characterized in that, The method includes: Obtain TRD cutoff wall design data, and obtain obstacle data based on the TRD cutoff wall design data; perform axis risk segmentation based on obstacle data to obtain axis risk data; Based on the axis risk data, the axis stability pilot hole arrangement is carried out to obtain the pilot hole arrangement data; Based on the borehole layout data, borehole mechanical matching settings are performed to obtain borehole mechanical matching data; the borehole mechanical matching data is then processed to remove obstacles to obtain borehole unobstructed data. Based on the non-obstruction data of the pilot hole, passive axis guidance for TRD trenching is performed to obtain TRD trenching guidance data.

2. The construction method of combining trenching and pre-drilling with TRD seepage prevention wall according to claim 1, characterized in that, The acquisition of obstacle data includes: Obtain TRD cutoff wall design data; The construction axis range is defined based on the TRD cutoff wall design data, and the construction axis range data is obtained. The obstacle sensing area is determined based on the construction axis range data, and the obstacle sensing area data is obtained. Obstacle data is obtained by aggregating obstacles from multiple sources based on obstacle perception area data.

3. The construction method of combining trenching and pre-drilling with TRD anti-seepage wall according to claim 1, characterized in that, The axis risk segmentation includes: Based on the obstacle data, the TRD cutoff wall design data is projected onto the axis to obtain the axis projection data; The obstacle influence zone is generated based on the axis projection data, and the obstacle influence zone data is obtained. The cutting force interference is evaluated by analyzing the data in the obstacle influence area to obtain the cutting force interference data; Based on the cutting force interference data, the axis stability risk is determined, and the axis risk data is obtained.

4. The construction method of combining trenching and pre-drilling with TRD anti-seepage wall according to claim 1, characterized in that, The arrangement of the axial stability pilot holes includes: Risk axis segments are extracted based on axis risk data to obtain risk axis segment data; The risk axis segment data is used to determine the deployment trigger, and deployment trigger data is obtained. Based on the layout trigger data, the lateral direction of the pilot hole layout is determined, and the lateral layout direction data is obtained; The parallel relationship between the borehole axis and the lateral arrangement direction data is set to obtain the borehole parallel setting data. The lateral offset of the pilot hole is determined based on the TRD cutoff wall design data, and the lateral offset data of the pilot hole is obtained. The longitudinal spacing of the pilot holes is determined based on the risk axis section data, and the longitudinal spacing of the pilot holes is obtained. The lateral arrangement direction data, pilot hole parallel setting data, pilot hole lateral offset data, and pilot hole longitudinal arrangement spacing data are integrated to obtain the pilot hole arrangement data.

5. The construction method for combining trenching and pre-drilling with TRD anti-seepage wall according to claim 1, characterized in that, The pilot hole mechanical matching settings include: The pilot hole functional section is determined based on the pilot hole layout data, and the pilot hole functional section data is obtained. Based on the data of the pilot hole's functional section, the effective functional depth of the pilot hole is matched and set to obtain the functional depth matching data. The aperture range data is obtained by matching the low resistance characteristics of the pilot hole diameter to the depth of action matching data. Based on the axis risk data, the mechanical synergy relationship between the pilot holes is analyzed, and the relationship data between the pilot holes is obtained. The hole filling state is set based on the hole diameter range data to obtain the hole filling state data; Based on the action depth matching data, aperture range data, inter-pipe relationship data, and pilot hole filling state data, pilot hole mechanical matching verification is performed to obtain pilot hole mechanical matching data.

6. The construction method of combining trenching and pre-drilling with TRD anti-seepage wall according to claim 5, characterized in that, The low-resistance characteristic matching setting of the pilot hole diameter includes: Formation cutting features are extracted based on the depth-of-action matching data to obtain formation cutting feature data; The low-resistance characteristics of the pilot hole are determined based on the formation cutting characteristic data, and the low-resistance characteristic data of the pilot hole are obtained. Based on the low-resistivity characteristic data of the pilot hole, the pilot hole diameter relationship is constructed to obtain the pilot hole diameter relationship data; Based on the data on the arrangement of the pilot holes and the relationship between the pilot hole diameters, upper and lower limits are set to obtain the range of hole diameters.

7. The construction method for combining trenching and pre-drilling with TRD anti-seepage wall according to claim 1, characterized in that, The non-obstruction clearing process includes: The non-obstacle-clearing target confirmation was performed on the mechanical matching data of the pilot hole to obtain the non-obstacle-clearing target data; Based on the non-obstruction removal target, the hole processing method is selected, and the hole processing method data is obtained; Mechanical control simulation was performed on the data of the hole processing method to obtain mechanical control data; Based on the mechanical control data, the low resistance characteristics of the pilot hole are maintained and verified, and the non-obstruction data of the pilot hole is obtained.

8. The construction method for combining trenching and pre-drilling with TRD anti-seepage wall according to claim 7, characterized in that, The confirmation of non-obstacle clearing targets includes: Based on the mechanical matching data of the pilot hole, mechanical functional processing of the pilot hole is performed to obtain the mechanical functional data of the pilot hole. Based on the axis risk data, the state retention data of the pilot hole mechanical function data is determined to obtain the state retention data. Based on the state-preserving data, non-obstacle-clearing constraints are applied to obtain non-obstacle-clearing constraint data; The target structure of the pilot hole is determined based on the non-obstacle clearing constraint data, and the target structure data of the pilot hole is obtained. Based on the mechanical function data of the pilot hole and the target structure data of the pilot hole, a joint verification was performed to obtain the non-obstacle clearing target data.

9. The construction method for combining trenching and pre-drilling with TRD anti-seepage wall according to claim 1, characterized in that, The TRD trenching passive axis guidance includes: Based on the non-obstruction data of the pilot hole, the TRD trenching operation section is matched to obtain the operation section data; Based on the data of the working section, the mechanical response activation of the low resistance region of the pilot hole and the processing of the uneven force state of the cutter head are carried out to obtain the data of the low resistance region of the pilot hole and the data of uneven force. Based on the data of the low-resistance region of the pilot hole and the data of uneven force distribution, the force redistribution data is obtained. Passive axis regression was performed based on the force redistribution data to obtain TRD trenching guidance data.

10. A combined construction system for trenching and pre-drilling and TRD (Trench-Drainage) anti-seepage wall, characterized in that, For performing the combined construction method of trenching and TRD cutoff wall as described in claim 1, the combined construction system of trenching and TRD cutoff wall comprises: The axis risk segmentation module is used to acquire TRD cutoff wall design data and obtain obstacle data based on the TRD cutoff wall design data; and to perform axis risk segmentation based on the obstacle data to obtain axis risk data. The axis stability pilot hole arrangement module is used to arrange axis stability pilot holes based on axis risk data to obtain pilot hole arrangement data. The non-obstacle clearing module is used to set the mechanical matching of the pilot holes based on the pilot hole layout data to obtain the pilot hole mechanical matching data; and to perform non-obstacle clearing processing on the pilot hole mechanical matching data to obtain the pilot hole non-obstacle clearing data. The TRD trenching passive axis guidance module is used to perform TRD trenching passive axis guidance based on the non-obstruction data of the pilot hole, and obtain TRD trenching guidance data.

Images