Pipe jacking construction water permeation prevention method and system under complex geological conditions

Abstract

The invention discloses a pipe-jacking construction water permeation prevention method and system under complex geological conditions, and relates to the technical field of pipe-jacking construction.The method comprises the steps that geological parameters of a construction area are collected, and water pressure and seepage data are obtained; according to the monitoring data and propulsion parameters generated during operation of the pipe jacking machine, the water permeation risk is judged; when the water permeation risk exceeds a preset threshold value, a directional grouting program is started, and a waterproof curtain is formed in front of the jacking pipe by regulating and controlling the grouting pressure and the grouting flow; pipe jacking propulsion parameters are regulated and controlled based on the grouting reinforcement effect, and regulation and control results and analysis data are stored; according to the method, potential seepage hidden dangers can be recognized earlier, the early warning accuracy is higher, a pressure-controlled flow stable injection strategy is adopted, the reliability and durability of a reinforced structure are improved, the maximum allowable thrust in the propelling process is limited, reinforcement body damage or stratum instability caused by over-thrust is avoided, and technical support is provided for formulating a precise construction scheme.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction technology, and in particular to a method and system for preventing water seepage during pipe jacking construction under complex geological conditions. Background Technology

[0002] Pipe jacking is a trenchless construction technique for laying underground pipelines without excavating the surface. It is widely used in underground engineering projects such as municipal water supply and drainage, gas, electricity, communications, and subway tunnels. With the expansion of urban underground space development, the application of pipe jacking has gradually extended to areas with high groundwater levels, complex geological structures, and significant differences in soil mechanical properties, such as gravel layers, silt layers, fractured zones, and highly permeable saturated soil layers. Under such complex geological conditions, pipe jacking is prone to problems such as soil erosion, expansion of seepage channels, and sudden water seepage, which not only affect construction safety but may also lead to surface subsidence, damage to surrounding buildings, and environmental risks. Therefore, how to effectively control the risk of water seepage during pipe jacking in complex geological environments is a key technical problem that urgently needs to be solved in this field. Current technologies typically employ prior surveys and geological modeling to predict risks, supplemented by manual monitoring and experience-based adjustment of advancement parameters during construction, and the deployment of grouting holes in high-risk areas to form a water-stopping barrier. These methods improve safety to some extent, but overall they still rely mainly on static design and manual experience control, making it difficult to meet the needs for real-time and refined control under complex geological conditions.

[0003] Existing permeability control technologies have the following shortcomings: construction risk assessment mainly relies on static survey data and fails to make full use of real-time monitoring data during construction, resulting in delayed risk assessment and difficulty in timely reflecting dynamic changes in water pressure and seepage conditions; existing grouting processes are mostly carried out with fixed pressure or flow rate, lacking a dynamic control mechanism linked to monitoring data, which poses a risk of ground disturbance caused by insufficient or excessive grouting. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a method and system for preventing water seepage during pipe jacking construction under complex geological conditions, which solves the shortcomings of existing technologies in dynamic monitoring, risk assessment, grouting control feedback adjustment, construction parameters, and reinforcement.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a method for preventing water seepage during pipe jacking construction under complex geological conditions, which includes collecting geological parameters of the construction area and obtaining water pressure and seepage data;

[0008] The risk of water seepage is determined based on monitoring data and the propulsion parameters generated during the operation of the pipe jacking machine;

[0009] When the risk of water permeation exceeds the preset threshold, the directional grouting procedure is initiated. By adjusting the grouting pressure and grouting flow rate, a water-stopping curtain is formed in front of the jacking pipe.

[0010] The pipe jacking parameters are adjusted based on the grouting reinforcement effect, and the adjustment results and analysis data are stored.

[0011] As a preferred embodiment of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in this invention, the geological parameters of the construction area collected include:

[0012] Deploy static cone penetration testing equipment to obtain cone tip resistance. pore pressure Total stress ;

[0013] Calculate the effective stress based on the obtained parameters. With initial strength value:

[0014] The test flow rate, section length, cross-sectional area, and head difference data were obtained through borehole sealing tests, and the location was calculated. In-situ permeability coefficient .

[0015] As a preferred embodiment of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in this invention, the method for obtaining water pressure and seepage data includes: obtaining water pressure and seepage data at location using a piezometer. ,time hydraulic momentum Simultaneously calculate the pore water pressure;

[0016] Location is obtained using a flow sensor. ,time seepage velocity The seepage velocity was verified based on Darcy's law.

[0017] As a preferred embodiment of the method for preventing water seepage during pipe jacking construction under complex geological conditions described in this invention, the step of determining the water seepage risk based on monitoring data and the propulsion parameters generated during the operation of the pipe jacking machine refers to constructing a water seepage risk determination function based on the collected data to quantitatively assess the current risk status. The function calculates the impact of pore water pressure, propulsion rate, thrust, and permeability coefficient on the water seepage risk.

[0018] Based on the output of the permeability risk assessment function, it is determined whether the current construction area is in a state of high seepage risk. The specific judgment logic is as follows:

[0019] Set threshold If R(x,t) > If R(x,t)≤ If so, the risk of seepage is considered controllable.

[0020] As a preferred embodiment of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in this invention, wherein: when the water seepage risk exceeds a preset threshold, a directional grouting procedure is initiated, and a water-stopping curtain is formed in front of the pipe by adjusting the grouting pressure and grouting flow rate, including: when the water seepage risk exceeds a preset threshold, a directional grouting procedure is initiated, and a water-stopping curtain is formed in front of the pipe by adjusting the grouting pressure and grouting flow rate, including:

[0021] If the risk of seepage increases, the directional grouting procedure will be automatically triggered to form a water-stopping curtain with barrier function in front of the pipe jacking machine. During the grouting process, a pressure-controlled flow rate stable injection strategy will be adopted. The grouting pressure should be higher than the pore water pressure and not exceed the formation's resistance to damage.

[0022] As a preferred embodiment of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in this invention, the method of adjusting the pipe jacking advancement parameters based on the grouting reinforcement effect includes: after the grouting process is completed and a water-stop curtain with sealing and stability is formed, the advancement parameters of the pipe jacking machine are dynamically adjusted.

[0023] Automatically collect the shear strength parameters of the strata within the reinforcement area, calculate the ultimate shear strength of the reinforcement area using the Mohr-Coulomb criterion, and calculate the maximum allowable thrust value at the pipe jacking front end based on the shear strength;

[0024] The propulsion rate is controlled using a negative feedback control model based on the pore water pressure in the grouting zone. When the pore water pressure is higher than the reference value... At that time, the propulsion rate will be automatically reduced.

[0025] As a preferred embodiment of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in this invention, the storage and control results and analysis data refer to the unified writing of monitoring data and control parameters collected during the pipe jacking process into a data index table, setting security access permissions for data isolation and encryption, and synchronously storing them in a local database and a cloud backup system. The stored data and its backup are periodically subjected to integrity checks and integrity check records are generated and written into the data archive along with the original data.

[0026] Secondly, the present invention provides a water permeability prevention system for pipe jacking construction under complex geological conditions, comprising:

[0027] The geological data acquisition module determines the soil structure and permeability coefficient based on the survey data of the construction area.

[0028] The monitoring and data acquisition module sets up monitoring points in the risk area and collects monitoring data such as pore water pressure and seepage rate in real time.

[0029] The risk assessment module inputs monitoring data and pipe jacking parameters into the seepage-mechanics coupling model, and determines the risk of water permeation by comparing whether the seepage rate and pore water pressure exceed a preset threshold.

[0030] The grouting control module initiates directional grouting when the risk exceeds a preset threshold, and forms a water-stop curtain in front of the jacking pipe by adjusting the grouting pressure and grouting flow rate.

[0031] The parameter control module dynamically optimizes and adjusts the pushing pressure and pushing speed according to the grouting reinforcement effect to ensure construction safety and efficiency;

[0032] The storage and analysis module performs structured storage and analysis of key parameters during the propulsion control process.

[0033] Thirdly, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, it implements any step of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in the first aspect of the present invention.

[0034] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in the first aspect of the present invention.

[0035] The beneficial effects of this invention are as follows: Compared with traditional methods that rely on experience or single-parameter monitoring, it can identify potential seepage hazards earlier and has higher early warning accuracy. The pressure-controlled flow rate stable injection strategy ensures that the grouting pressure is higher than the pore water pressure to ensure effective grout penetration, while being lower than the formation's resistance to damage to avoid uplift or cracking. This improves the reliability and durability of the reinforced structure, limits the maximum allowable thrust during the advancement process, avoids damage to the reinforced body or formation instability caused by excessive thrust, and provides technical support for developing precise construction plans. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart of the water permeation prevention method for pipe jacking construction under complex geological conditions in Example 1. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0041] Example 1, referring to Figure 1 This is the first embodiment of the present invention, which provides a method for preventing water seepage during pipe jacking construction under complex geological conditions, including the following steps:

[0042] S1. Collect geological parameters of the construction area and obtain water pressure and seepage data.

[0043] Specifically, geological parameters of the construction area are collected, including the deployment of static cone penetration testing equipment to obtain cone tip resistance. pore pressure Total stress ;

[0044] Calculate the effective stress based on the obtained parameters. With initial strength value:

[0045]

[0046] in, For depth Effective vertical stress at the location;

[0047] The test flow rate was obtained through borehole sealing tests. Segment length Cross-sectional area water head difference Calculate the in-situ permeability coefficient:

[0048]

[0049] in, For position In-situ permeability coefficient at the location;

[0050] Furthermore, water pressure and seepage data are acquired, including by using a piezometer to obtain data at the location. ,time hydraulic momentum Simultaneously calculate the pore water pressure:

[0051]

[0052] in, The density of water, It is the acceleration due to gravity. It is the calculated position. ,time pore water pressure;

[0053] Seepage velocity is obtained using a flow velocity sensor. , indicating the position ,time The seepage velocity was verified based on Darcy's law:

[0054]

[0055] in, The value is the permeability coefficient of the soil layer at that location. For hydraulic gradient;

[0056] By combining static cone penetration testing, borehole sealing tests, and the combined application of piezometers and flow velocity sensors, a coupled acquisition system for mechanical and hydrodynamic parameters was established. Through effective stress calculation, hydraulic potential analysis, and verification using Darcy's law, multidimensional support for risk assessment was achieved, providing a solid foundation for the subsequent construction of permeability risk functions and the formulation of construction control measures. This improved the authenticity and timeliness of geological exploration data, providing more comprehensive parameter support for construction risk assessment. Furthermore, it achieved a comprehensive consideration of static and hydrodynamic factors, making the analysis results of permeability risk closer to the actual construction environment. Simultaneously, this method can provide basic data support for optimizing pipe jacking machine propulsion parameters, designing grouting reinforcement strategies, and subsequent data deposition analysis, thereby enhancing the overall safety and scientific rigor of the construction.

[0057] S2. Determine the risk of water seepage based on monitoring data and the propulsion parameters generated during the operation of the pipe jacking machine.

[0058] Specifically, based on monitoring data and the propulsion parameters generated during the operation of the pipe jacking machine, the risk of water seepage is determined, including:

[0059] A permeability risk assessment function was constructed based on the collected data. The function for quantitatively assessing the current risk status is calculated using the following formula:

[0060] +

[0061] in, This is a function representing the impact of pore water pressure on permeability risk, used to quantify the contribution of pore water pressure to permeability risk.

[0062]

[0063] in, Spatial location time pore water pressure, The critical pore water pressure; The propulsion rate is used as a function to influence the risk of water seepage, quantifying the contribution of propulsion rate to the risk of water seepage.

[0064]

[0065] in, For the pipe jacking machine at all times The actual propulsion rate Maximum propulsion speed;

[0066] The thrust-to-water-permeability risk function is used to quantify the contribution of thrust to the water-permeability risk:

[0067]

[0068] in, For the pipe jacking machine at all times The thrust applied to the front end of the pipe section, This refers to the ultimate load-bearing capacity of the front end;

[0069] Let be the function of the permeability coefficient on the risk of water permeability, used to quantify the contribution of the permeability coefficient to the risk of water permeability:

[0070]

[0071] in, Indicates the location time The soil permeability coefficient, This represents the maximum value of the permeability coefficient.

[0072] Weighting coefficient , , This determines the different physical quantities in the decision function. This setting is based on statistics of past engineering accidents;

[0073] Based on the output of the permeability risk assessment function R(x,t), it is determined whether the current construction area is in a state of high seepage risk. The specific judgment logic is as follows:

[0074] Thresholds are set based on the construction environment, geological characteristics, and engineering requirements. If R(x,t) > If R(x,t)≤ If so, the seepage risk is considered controllable;

[0075] This technology, through the complex construction of a permeability risk assessment function, combined with key parameters such as pore water pressure, propulsion rate, thrust, and permeability coefficient, achieves quantitative and dynamic assessment of permeability risk. Furthermore, by setting thresholds, it enables tiered control of risk status, enhancing the timeliness of risk control and allowing for real-time adjustments during construction based on the assessment results. This significantly improves the scientific rigor and accuracy of risk assessment, enabling real-time monitoring and rapid response to risks during construction. Threshold adjustment further enhances the method's adaptability and engineering practicality.

[0076] S3. When the risk of water permeation exceeds the preset threshold, the directional grouting procedure is initiated. By adjusting the grouting pressure and grouting flow rate, a water-stopping curtain is formed in front of the jacking pipe.

[0077] Specifically, when the risk of water permeation exceeds a preset threshold, a directional grouting procedure is initiated. By adjusting the grouting pressure and flow rate, a water-stop curtain is formed in front of the jacking pipe, including:

[0078] If the risk of seepage increases, the directional grouting procedure will be automatically triggered to form a water-stopping curtain with barrier function in front of the pipe jacking machine, thereby inhibiting the expansion of seepage channels and the risk of sudden increase in water head.

[0079] To ensure the effectiveness of the water-stop curtain, a pressure-controlled flow rate stabilization injection strategy is adopted during the grouting process. The grouting pressure should be higher than the pore water pressure to drive the grout to penetrate into the permeable zone. The grouting pressure should not exceed the formation's resistance to damage to avoid surface heave or cracking. Should meet:

[0080]

[0081] in, Pore ​​water pressure, To obtain effective vertical stress, soil cohesion is obtained using a static cone penetration test device. Angle of friction with soil ;

[0082] Grouting flow rate Should meet:

[0083]

[0084] in, This refers to the instantaneous flow rate of the grouting. Where is the nozzle cross-sectional area. For grouting pressure, Pore ​​water pressure, The density is the slurry density.

[0085] By constructing a permeability risk assessment function, multi-dimensional parameters such as pore water pressure, propulsion rate, thrust, and permeability coefficient are uniformly quantified, enabling a scientific and real-time assessment of permeability risk during pipe jacking construction, avoiding the uncertainty caused by relying on experience-based judgments. Thresholds are set based on the construction environment and geological characteristics, making the judgment logic highly adaptable and targeted, applicable to risk identification under different geological conditions. When the permeability risk exceeds the preset threshold, the system automatically triggers a directional grouting procedure, forming a rapid response mechanism and realizing a shift from traditional "passive emergency response" to "active prevention and control." By forming a water-stop curtain in front of the pipe jacking machine, seepage channels are effectively blocked, pore water pressure is reduced, and sudden increases in water head are suppressed, significantly improving the stability and safety of the construction area. A pressure-controlled flow rate stable injection strategy is adopted, ensuring that the grouting pressure is both higher than the pore water pressure to guarantee effective grout penetration and lower than the geological strength to prevent surface heave and soil cracking, improving grout uniformity and grout utilization, and reducing construction costs. Simultaneously, this method achieves intelligent and dynamic control of the construction process through a closed-loop control system of "monitoring-judgment-grouting-feedback."

[0086] S4. Adjust the pipe jacking parameters based on the grouting reinforcement effect, and store the adjustment results and analysis data.

[0087] Specifically, adjusting the pipe jacking parameters based on the grouting reinforcement effect includes:

[0088] After the grouting process is completed and a water-stop curtain with sealing and stability is formed, in order to avoid disturbing the reinforced structure and maintain the mechanical stability of the stratum structure, the advancement parameters of the pipe jacking machine need to be dynamically controlled.

[0089] The shear strength parameters of the strata within the reinforced area are automatically collected, and the ultimate shear strength of the reinforced area is calculated using the Mohr-Coulomb criterion.

[0090]

[0091] in, To the shear strength after reinforcement, To create soil cohesion through grouting, Let Z be the effective vertical stress at depth z. It is the internal friction angle;

[0092] Calculate the maximum allowable thrust value at the tunnel jacking front end based on shear strength. :

[0093]

[0094] in, This refers to the contact area between the front end of the jacking pipe and the reinforced soil.

[0095] The propulsion rate is controlled using a negative feedback control model based on the pore water pressure in the grouting zone. The specific calculation formula is as follows:

[0096]

[0097] in, To control the advance rate of the grouting area, The base advance rate is set based on the working conditions of the unreinforced section. To improve the control sensitivity coefficient, it was obtained through analysis of historical engineering data. To measure the pore water pressure, This is the reference pore pressure threshold after grouting has reached a steady state of consolidation;

[0098] When pore water pressure Higher than the reference value At that time, the propulsion rate will be automatically reduced.

[0099] Furthermore, the storage and analysis of control results and data include:

[0100] The storage and control results and analysis data refer to the unified writing of monitoring data and control parameters collected during the pipe jacking process into a data index table, setting security access permissions for data isolation and encryption, and synchronously storing them in a local database and a cloud backup system. The stored data and its backups are periodically subjected to integrity checks and integrity check records are generated and written into the data archive along with the original data. The integrity checks include, but are not limited to, checksum comparison, timestamp consistency check, and key field coverage check.

[0101] After grouting is completed and a water-stop curtain is formed, the pipe jacking parameters are dynamically adjusted to avoid disturbing the reinforced area, thus ensuring the stability of the reinforced structure and the durability of the water-stopping effect. Based on real-time collected stratum shear strength parameters and combined with the Mohr-Coulomb criterion to accurately calculate the ultimate shear strength, the maximum allowable thrust value for pipe jacking can be scientifically determined, effectively avoiding damage to the reinforced body or stratum instability caused by excessive thrust. By constructing a negative feedback control model based on pore water pressure, the advancing rate can be automatically reduced when the pore water pressure exceeds the reference value, suppressing excessive rise in pore water pressure, preventing soil erosion and water seepage accidents, thereby improving the controllability and safety of construction. The system as a whole realizes closed-loop control of "monitoring-calculation-control", reducing the uncertainty caused by human factors and improving the automation and intelligence level of the pipe jacking construction process. Meanwhile, this invention unifies the management of monitoring data and control parameters through data indexing and storage mechanisms. Combined with access control, data isolation and encryption measures, and dual backups (local and cloud), it effectively constructs a highly reliable data management system. Furthermore, through integrity detection methods such as checksum comparison, timestamp consistency checks, and key field coverage verification, it ensures the long-term security and reliability of stored data, providing strong technical support for construction review, accident tracing, and project auditing.

[0102] This embodiment also provides a water permeability prevention system for pipe jacking construction under complex geological conditions, including:

[0103] The geological data acquisition module determines the soil structure and permeability coefficient based on the survey data of the construction area.

[0104] The monitoring and data acquisition module sets up monitoring points in the risk area and collects monitoring data such as pore water pressure and seepage rate in real time.

[0105] The risk assessment module inputs monitoring data and pipe jacking parameters into the seepage-mechanics coupling model, and determines the risk of water permeation by comparing whether the seepage rate and pore water pressure exceed a preset threshold.

[0106] The grouting control module initiates directional grouting when the risk exceeds a preset threshold, and forms a water-stop curtain in front of the jacking pipe by adjusting the grouting pressure and grouting flow rate.

[0107] The parameter control module dynamically optimizes and adjusts the pushing pressure and pushing speed according to the grouting reinforcement effect to ensure construction safety and efficiency;

[0108] The storage and analysis module performs structured storage and analysis of key parameters during the propulsion control process.

[0109] This embodiment also provides a computer device applicable to the method for preventing water seepage during pipe jacking construction under complex geological conditions, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the method for preventing water seepage during pipe jacking construction under complex geological conditions as proposed in the above embodiment.

[0110] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0111] This embodiment also provides a storage medium storing a computer program, which, when executed by a processor, implements the method for preventing water seepage during pipe jacking construction under complex geological conditions as proposed in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0112] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for preventing water seepage during pipe jacking construction under complex geological conditions, characterized in that: include, Collect geological parameters of the construction area and obtain water pressure and seepage data; The risk of water seepage is determined based on monitoring data and the propulsion parameters generated during the operation of the pipe jacking machine; When the risk of water permeation exceeds the preset threshold, the directional grouting procedure is initiated. By adjusting the grouting pressure and grouting flow rate, a water-stopping curtain is formed in front of the jacking pipe. The pipe jacking parameters are adjusted based on the grouting reinforcement effect, and the adjustment results and analysis data are stored.

2. The method for preventing water seepage during pipe jacking construction under complex geological conditions as described in claim 1, characterized in that: The geological parameters of the construction area to be collected include: deploying static cone penetration testing equipment to obtain cone tip resistance. pore pressure Total stress ; Calculate the effective stress based on the obtained parameters. And the initial strength value; The test flow rate, section length, cross-sectional area, and head difference data were obtained through borehole sealing tests, and the location was calculated. In-situ permeability coefficient .

3. The method for preventing water seepage during pipe jacking construction under complex geological conditions as described in claim 2, characterized in that: The acquisition of water pressure and seepage data includes: acquiring water pressure and seepage data at location using a piezometer. ,time hydraulic momentum Simultaneously calculate the pore water pressure; Location is obtained using a flow sensor. ,time seepage velocity The seepage velocity was verified based on Darcy's law.

4. The method for preventing water seepage during pipe jacking construction under complex geological conditions as described in claim 3, characterized in that: The step of determining the water permeability risk based on monitoring data and the propulsion parameters generated during the operation of the pipe jacking machine refers to constructing a water permeability risk determination function based on the collected data to quantitatively assess the current risk status. The function calculates the water permeability risk by considering the influence of pore water pressure, propulsion rate, thrust, and permeability coefficient. Based on the output of the permeability risk assessment function, it is determined whether the current construction area is in a high permeability risk state. The specific judgment logic is as follows: Set threshold If R(x,t) > If R(x,t)≤ If so, the risk of seepage is considered controllable.

5. The method for preventing water seepage during pipe jacking construction under complex geological conditions as described in claim 4, characterized in that: When the water permeability risk exceeds a preset threshold, a directional grouting procedure is initiated. By adjusting the grouting pressure and flow rate, a water-stop curtain is formed in front of the jacking pipe. This includes: When the water permeability risk exceeds a preset threshold, a directional grouting procedure is initiated. By adjusting the grouting pressure and flow rate, a water-stop curtain is formed in front of the jacking pipe. If the risk of seepage increases, the directional grouting procedure will be automatically triggered to form a water-stopping curtain with barrier function in front of the pipe jacking machine. During the grouting process, a pressure-controlled flow rate stable injection strategy will be adopted. The grouting pressure should be higher than the pore water pressure and not exceed the formation's resistance to damage.

6. The method for preventing water seepage during pipe jacking construction under complex geological conditions as described in claim 5, characterized in that: The method of adjusting the pipe jacking parameters based on the grouting reinforcement effect includes: after the grouting process is completed and a water-stop curtain with sealing and stability is formed, the pipe jacking machine's advancement parameters are dynamically adjusted. Automatically collect the shear strength parameters of the strata within the reinforcement area, calculate the ultimate shear strength of the reinforcement area using the Mohr-Coulomb criterion, and calculate the maximum allowable thrust value at the pipe jacking front end based on the shear strength; The propulsion rate is controlled using a negative feedback control model based on the pore water pressure in the grouting zone. When the pore water pressure is higher than the reference value... At that time, the propulsion rate will be automatically reduced.

7. A method for preventing water seepage during pipe jacking construction under complex geological conditions as described in claim 6, characterized in that: The storage and control results and analysis data refer to the unified writing of monitoring data and control parameters collected during the pipe jacking process into a data index table, setting security access permissions for data isolation and encryption, and synchronously storing them in a local database and a cloud backup system. The stored data and its backups are periodically checked for integrity and integrity check records are generated and written into the data archive along with the original data.

8. A water permeability prevention system for pipe jacking construction under complex geological conditions, based on the water permeability prevention method for pipe jacking construction under complex geological conditions as described in any one of claims 1 to 7, characterized in that: include: The geological data acquisition module determines the soil structure and permeability coefficient based on the survey data of the construction area. The monitoring and data acquisition module sets up monitoring points in the risk area and collects monitoring data such as pore water pressure and seepage rate in real time. The risk assessment module inputs monitoring data and pipe jacking parameters into the seepage-mechanics coupling model, and determines the risk of water permeation by comparing whether the seepage rate and pore water pressure exceed a preset threshold. The grouting control module initiates directional grouting when the risk exceeds a preset threshold, and forms a water-stop curtain in front of the jacking pipe by adjusting the grouting pressure and grouting flow rate. The parameter control module dynamically optimizes and adjusts the pushing pressure and pushing speed according to the grouting reinforcement effect to ensure construction safety and efficiency; The storage and analysis module performs structured storage and analysis of key parameters during the propulsion control process.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the method for preventing water seepage during pipe jacking construction under complex geological conditions as described in any one of claims 1 to 7.

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