Pressure distribution adjusting method for plain soil compaction pile construction

Abstract

The invention discloses a pressure distribution adjusting method for plain soil compaction pile construction, relates to the technical field of pressure adjustment, is used for solving the problems of non-uniform soil body compactness distribution and increased stress diffusion unbalance degree, and provides a pressure distribution adjusting method for the plain soil compaction pile construction by monitoring hydraulic flow data of companding propulsion equipment, evaluating hydraulic driving characteristics and dividing response construction subdomains. The method comprises the following steps of: acquiring propulsion feedback resistance of each sub-domain, performing pressure release control processing on a response construction sub-domain, acquiring slippage springback data, analyzing a springback convergence state, performing sub-domain screening and marking in combination with the propulsion feedback resistance, calling neighborhood penetration resistance data of the marked sub-domain, evaluating a surrounding domain compaction grade, and generating a construction path sequence. And according to the construction path sequence, a domain allocation coefficient is set, domain propulsion loading pressure is corrected, domain regulation and dynamic optimization of pressure distribution are achieved, and compaction uniformity and construction stability are improved.

Description

Technical Field

[0001] This invention relates to the field of pressure regulation technology, and more specifically, to a method for regulating pressure distribution in the construction of compaction piles in plain soil. Background Technology

[0002] Compacting piles, a common reinforcement method in foundation treatment, typically use a compaction and expansion device to apply a pushing force to the soil, causing lateral displacement of the surrounding soil and forming a compacted structure. They are widely used in projects aimed at improving the bearing capacity and controlling deformation of weak foundations. In current construction processes, the pushing pressure is mostly controlled through equipment operating parameters and field experience. The construction sequence generally follows preset pile positions or fixed paths, and construction monitoring mainly focuses on recording single-point pressure or penetration resistance.

[0003] The existing technology has the following shortcomings: Currently, existing technologies mainly rely on single propulsion pressure or equipment operation experience for construction control, lacking a regional identification and pressure coordination adjustment mechanism for differences in the response of the construction area. This easily leads to local over- or under-compression phenomena, resulting in uneven soil compaction distribution and increased stress diffusion imbalance, which reduces the uniformity of foundation reinforcement and construction stability. Therefore, a pressure distribution adjustment method for compaction pile construction in plain soil is proposed.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a pressure distribution adjustment method for compaction pile construction in plain soil. This method addresses the problems mentioned in the background art by employing a construction domain identification mechanism based on hydraulic drive characteristics, a domain screening strategy combined with slip rebound response, a compaction level assessment and construction path adaptive generation mechanism based on neighborhood penetration resistance, and a domain-oriented dynamic allocation and control of propulsion loading pressure.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for adjusting pressure distribution during the construction of compaction piles in plain soil, comprising the following steps: Step S1: When compaction construction is carried out in the area to be compacted, monitor the hydraulic flow data of the compressive expansion propulsion equipment and analyze the hydraulic drive characteristics. Based on the hydraulic drive characteristics, divide the area to be compacted into response construction domains and detect the propulsion feedback resistance of the response construction domains. Step S2: Perform pressure release control processing on the response construction sub-domain, set the observation time, collect the slip rebound data of the response construction sub-domain within the observation time, analyze the rebound convergence state using the slip rebound data, and filter and mark the response construction sub-domains in combination with the propulsion feedback resistance. Step S3: Access the construction monitoring information database to retrieve the neighborhood penetration resistance data of the marked response construction sub-domain, evaluate the compaction level of the surrounding area based on the neighborhood penetration resistance data, and generate the construction path sequence of the marked response construction sub-domain. Step S4: Detect the advancement loading pressure of the marked response construction domain, set the domain allocation coefficient according to the construction path sequence, and use the domain allocation coefficient to correct the advancement loading pressure of the marked response construction domain.

[0007] In a preferred embodiment, in step S1, when the compressive expansion propulsion device performs compaction construction on the soil compaction piles in the area to be compacted, a preset flow rate acquisition cycle is set and divided into multiple acquisition times. The instantaneous volumetric flow rate of the pressure diffuser propulsion device is monitored by a flow sensor at each acquisition time, and the instantaneous volumetric flow rate is used as hydraulic flow data. The hydraulic flow data are sorted in ascending order according to their numerical values ​​and combined into a hydraulic flow set. A first quantile ratio and a second quantile ratio are preset. The corresponding number of hydraulic flow data in the hydraulic flow set are selected according to the first quantile ratio and the second quantile ratio respectively. The flow quantile width is calculated based on the selection results. The ratio of the flow quantile width to the preset flow acquisition period is used as the hydraulic drive characteristic of the soil compaction pile.

[0008] In a preferred embodiment, in step S1, the hydraulic drive feature is compared with a preset hydraulic drive threshold to divide the area to be compacted into response construction domains. If the hydraulic drive characteristics are greater than the preset hydraulic drive threshold, then the plain soil compaction pile will be used as the response construction domain. Conversely, compaction piles in plain soil are not considered as part of the response construction zone; The hydraulic pressure value of the working chamber of the propulsion cylinder is detected by the pressure sensor inside the propulsion cylinder cavity in the pressure diffusion propulsion equipment, and the effective pressure-bearing area of ​​the propulsion cylinder piston is retrieved by accessing the equipment parameter configuration table. The product of the hydraulic pressure value and the effective pressure area of ​​the piston in the propulsion cylinder is used as the propulsion feedback resistance in the response construction zone.

[0009] In a preferred embodiment, in step S2, pressure release control is performed on the response construction zone. Specifically, for the response construction zone, the propulsion cylinder in the pressure diffusion propulsion device is stopped from moving forward, and the loading pressure in the working chamber is released. The observation time is preset and divided into multiple observation moments. At each observation moment, the axial displacement of the propulsion component in the compressive diffusion propulsion device is collected by the displacement sensor in the axial direction. The difference between the axial displacements of adjacent observation moments is calculated to obtain the slippage and rebound data. After sorting the slip rebound data in chronological order, they are combined into a slip rebound sequence. In the slip rebound sequence, the cumulative rebound displacement value corresponding to the current observation time is calculated by using the slip rebound data of the current observation time and the previous observation time. The observation time corresponding to the maximum absolute value of the cumulative rebound displacement is marked, and the residual rebound fluctuation is calculated from the slip rebound data after the marked observation time.

[0010] In a preferred embodiment, in step S2, the ratio of the residual rebound fluctuation to the maximum value of the absolute value of the cumulative rebound displacement is used as the rebound convergence index. If the rebound convergence index is greater than the preset rebound convergence threshold, the rebound convergence state of the response construction domain is a low-convergence rebound state. Conversely, the rebound convergence state of the response construction domain is a high-convergence rebound state. The propulsion feedback resistance threshold is calculated based on each propulsion feedback resistance. If the propulsion feedback resistance is greater than the propulsion feedback resistance threshold, the response construction domain is determined to be in a state of high constraint stress. Conversely, if the response construction domain is determined to be in a low-constraint stress state; When the springback convergence state of the response construction domain is a low convergence springback state and it is under low constraint stress state, the response construction domain is marked. Otherwise, do not mark the response construction domain.

[0011] In a preferred embodiment, in step S3, after obtaining the marked response construction domain, the neighboring penetration resistance data of the marked response construction domain are retrieved from the construction monitoring information database. The construction monitoring information database is a database used in the construction site data management system to store historical and real-time monitoring data; Penetration resistance data refers to the axial resistance value recorded by the penetration equipment within a unit penetration depth during the construction of compaction piles in plain soil. The neighborhood average penetration resistance is obtained by arithmetically averaging the neighborhood penetration resistance data of the marked response construction domain. The standard deviation of the neighborhood penetration resistance is further calculated to obtain the penetration resistance dispersion coefficient.

[0012] In a preferred embodiment, in step S3, the compactness level of the surrounding area is constructed by weighted difference method based on the neighborhood average penetration resistance and the penetration resistance dispersion coefficient. The Min-Max normalization formula was used to normalize the extreme values ​​of the compaction level of the marked response construction domain to obtain the normalized compaction coefficient. Based on the normalized domain compactness coefficient and the springback convergence index, a path priority evaluation function is constructed using a weighted summation method to calculate the path priority coefficient; All marked response construction domains are sorted from largest to smallest according to the path priority coefficient value to generate the construction path sequence.

[0013] In a preferred embodiment, in step S4, the hydraulic pressure value corresponding to the current marked response construction zone is collected in real time by a pressure sensor installed in the working chamber of the propulsion cylinder. Access the equipment parameter configuration table to retrieve the effective pressure area of ​​the propulsion cylinder piston, and multiply the effective pressure area by the average hydraulic pressure to calculate the axial loading force of the current domain; Based on the construction path sequence generated in step S3, the marked response construction domains are sequentially numbered to obtain the domain sequence position. Constructing path weight coefficients based on domain order: ; in, This is the path weight coefficient. To mark the total number of response construction domains, This is the domain order.

[0014] In a preferred embodiment, in step S4, a domain allocation coefficient is constructed based on the path weight coefficient and the path priority coefficient: ; in, For the domain allocation coefficient, This is the path weight coefficient. This is the path priority coefficient; Set a maximum allowable allocation limit coefficient. When the regional allocation coefficient is greater than the maximum allowable allocation limit coefficient, set the regional allocation coefficient to be equal to the maximum allowable allocation limit coefficient. The domain allocation coefficient is multiplied by the original propulsion loading pressure to obtain the corrected propulsion loading pressure. The corrected propulsion loading pressure is used as the target pressure setpoint of the propulsion cylinder. The opening of the hydraulic proportional valve is adjusted through a closed-loop control algorithm so that the actual hydraulic pressure converges to the corrected propulsion loading pressure.

[0015] The technical effects and advantages of this invention are as follows: This invention monitors the hydraulic flow data of the pressure diffusion propulsion equipment, evaluates the hydraulic drive characteristics, divides the response construction domains, obtains the propulsion feedback resistance of each domain, performs pressure release control processing on the response construction domains and collects slip rebound data, analyzes the rebound convergence state and combines it with the propulsion feedback resistance to screen and mark the domains, retrieves the neighboring penetration resistance data of the marked domains, evaluates the compaction level of the surrounding area and generates the construction path sequence, sets the domain allocation coefficient according to the construction path sequence, and corrects the domain propulsion loading pressure, thereby realizing the domain control and dynamic optimization of pressure distribution, improving the compaction uniformity and construction stability. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the implementation of the pressure distribution adjustment method for compaction pile construction in plain soil according to the present invention.

[0017] Figure 2 This is a schematic diagram of the steps of the pressure distribution adjustment method for the construction of compaction piles in plain soil according to the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention monitors the hydraulic flow data of the pressure diffusion propulsion equipment, evaluates the hydraulic drive characteristics, divides the response construction domains, obtains the propulsion feedback resistance of each domain, performs pressure release control processing on the response construction domains and collects slip rebound data, analyzes the rebound convergence state and combines it with the propulsion feedback resistance to screen and mark the domains, retrieves the neighboring penetration resistance data of the marked domains, evaluates the compaction level of the surrounding area and generates the construction path sequence, sets the domain allocation coefficient according to the construction path sequence, and corrects the domain propulsion loading pressure to achieve domain control and dynamic optimization of pressure distribution.

[0020] Example 1, such as Figures 1 to 2 As shown, the pressure distribution adjustment method for compaction pile construction in plain soil includes the following steps: Step S1: When compaction construction is carried out in the area to be compacted, monitor the hydraulic flow data of the compressive expansion propulsion equipment and analyze the hydraulic drive characteristics. Based on the hydraulic drive characteristics, divide the area to be compacted into response construction domains and detect the propulsion feedback resistance of the response construction domains. Step S2: Perform pressure release control processing on the response construction sub-domain, set the observation time, collect the slip rebound data of the response construction sub-domain within the observation time, analyze the rebound convergence state using the slip rebound data, and filter and mark the response construction sub-domains in combination with the propulsion feedback resistance. Step S3: Access the construction monitoring information database to retrieve the neighborhood penetration resistance data of the marked response construction sub-domain, evaluate the compaction level of the surrounding area based on the neighborhood penetration resistance data, and generate the construction path sequence of the marked response construction sub-domain. Step S4: Detect the advancement loading pressure of the marked response construction domain, set the domain allocation coefficient according to the construction path sequence, and use the domain allocation coefficient to correct the advancement loading pressure of the marked response construction domain.

[0021] The specific implementation is as follows: In step S1, when the compressive expansion propulsion equipment performs compaction construction on the soil compaction piles in the area to be compacted, a preset flow acquisition cycle is set and divided into multiple acquisition times. At each acquisition time, the instantaneous volume flow rate of the compressive expansion propulsion equipment is monitored by a flow sensor, and the instantaneous volume flow rate is used as hydraulic flow data. Among them, the plain soil compaction pile refers to the foundation treatment structure that laterally compacts the soil around the pile location and forms a compacted zone by means of compression and expansion. The compression and expansion propulsion equipment is a hydraulically driven pile construction device used for the construction of plain soil compaction piles, which causes the soil particles in the plain soil compaction pile to rearrange and form a lateral compacted zone. The hydraulic flow data is sorted in ascending order according to its numerical value and combined into a hydraulic flow set. A first quantile ratio and a second quantile ratio are preset. The first quantile ratio is used to determine the low-level flow reference range, and the second quantile ratio is used to determine the high-level flow reference range. Based on the first quantile ratio, hydraulic flow data corresponding to the first quantile ratio are selected sequentially from the front to the back of the hydraulic flow set, and their average value is taken as the low quantile flow value of the hydraulic flow set; based on the second quantile ratio, hydraulic flow data corresponding to the second quantile ratio are selected from the back to the front of the hydraulic flow set, and their average value is taken as the high quantile flow value of the hydraulic flow set. The difference between the high-quantile flow rate and the low-quantile flow rate is determined as the flow rate quantile width of the soil compaction pile. The ratio of the flow rate quantile width to the preset flow rate acquisition period is used as the hydraulic drive characteristic of the soil compaction pile, reflecting the degree of hydraulic oil supply fluctuation of the compressive expansion propulsion equipment relative to the overall oil supply level. The larger the hydraulic drive characteristic, the more unstable the force state during propulsion, and the greater the risk of intermittent force release or local slippage and consumption during propulsion; the smaller the hydraulic drive characteristic, the more stable the oil supply output of the pressure diffusion propulsion equipment.

[0022] The hydraulic drive characteristics are compared with the preset hydraulic drive threshold to divide the area to be compacted into response construction domains. If the hydraulic drive characteristics are greater than the preset hydraulic drive threshold, then the plain soil compaction pile will be used as the response construction domain. Conversely, compaction piles in plain soil are not considered as part of the response construction zone; Further pressure relief and control treatment was applied to the response construction zone, and the energy dissipation and stress transmission instability caused by the hole wall slip interface in the response construction zone were analyzed.

[0023] The hydraulic pressure value of the working chamber of the propulsion cylinder is detected by the pressure sensor inside the propulsion cylinder cavity in the pressure diffusion propulsion equipment, and the effective pressure-bearing area of ​​the propulsion cylinder piston is retrieved by accessing the equipment parameter configuration table. The product of the hydraulic pressure value and the effective pressure-bearing area of ​​the piston of the propulsion cylinder is used as the propulsion feedback resistance of the response construction zone. The propulsion feedback resistance refers to the reverse constraint force generated by the surrounding soil on the propulsion component during the process of the pressure-bearing propulsion equipment pushing the pressure towards the response construction zone. It should be noted that the preset flow acquisition cycle can be set according to the sampling frequency and construction control accuracy requirements; the flow sensor is a volumetric flow detection element installed on the oil supply pipeline of the pressure diffuser propulsion equipment, used to detect the volumetric flow of hydraulic oil in the pipeline per unit time in real time; the preset first quantile ratio and preset second quantile ratio can be set according to the type of soil layer and the hydraulic flow fluctuation range during historical construction; the preset hydraulic drive threshold can be set according to the statistical results of historical construction samples or the baseline hydraulic drive characteristic distribution range obtained during the test pile stage; the equipment parameter configuration table is an equipment-side database that stores the equipment structural parameters.

[0024] By analyzing hydraulic flow fluctuations, the risk of hole wall slippage and dissipation, which is difficult to identify directly during the loading stage, can be screened in advance at the equipment-side data level, providing a clear target and judgment basis for subsequent pressure release and rebound convergence analysis.

[0025] In step S2, pressure release control processing is performed on the response construction sub-domain to observe the structural redistribution process of the response construction sub-domain under unloading conditions. Pressure release control processing refers to stopping the loading output of the propulsion cylinder and switching the hydraulic pressure of the working chamber of the propulsion cylinder to the unloading state. Specifically, for the response construction sub-domain, the propulsion cylinder in the pressure diffusion propulsion device stops moving forward and releases the loading pressure in the working chamber at the same time. After pressure relief and control, the observation time is preset and divided into multiple observation moments. At each observation moment, the axial displacement of the propulsion component in the pressure diffusion propulsion device is collected by the displacement sensor in the axial direction. The difference between the axial displacements of adjacent observation moments is calculated to obtain the slip rebound data, which reflects the passive retreat behavior caused by the stress release in the construction sub-domain during the unloading stage. After sorting the slip rebound data in chronological order, they are combined into a slip rebound sequence. The first observation time is taken as the starting time, and the cumulative rebound displacement value at the starting time is initialized to 0. The slip rebound data are recursively accumulated according to the observation time sequence. The slip rebound data at the current observation time is added to the cumulative rebound displacement value at the previous observation time to obtain the cumulative rebound displacement value corresponding to the current observation time. The observation time corresponding to the maximum absolute value of the cumulative rebound displacement is marked. Taking the marked observation time as the starting point of the analysis, the observation time after the marked observation time is marked as the residual rebound time. The residual rebound fluctuation amount is obtained by taking the absolute value of the slip rebound data of the residual rebound time and calculating the average value. The ratio of the residual rebound fluctuation to the maximum absolute value of the cumulative rebound displacement is used as the rebound convergence index. The rebound convergence index reflects whether the rebound process of the response construction domain can quickly stabilize after the peak rebound. The larger the value, the slower the rebound process converges, indicating that the stress structure formed during the loading stage is unstable and there may be discontinuous stress transmission path and energy dissipation caused by the hole wall slip interface. The smaller the value, the weaker the residual fluctuation after the peak rebound and the faster the rebound process stabilizes, indicating that the stress structure can quickly reach a stable state after unloading. The rebound convergence index is compared with the preset rebound convergence threshold to analyze the rebound convergence status of the response construction domain. If the rebound convergence index is greater than the preset rebound convergence threshold, the rebound convergence state of the response construction domain is a low-convergence rebound state. Conversely, the rebound convergence state of the response construction domain is a high-convergence rebound state. A low-convergence rebound state indicates that the proportion of residual fluctuations after the peak rebound is relatively high, and the rebound process is slow to stabilize; a high-convergence rebound state indicates that the proportion of residual fluctuations after the peak rebound is relatively low, and the rebound process is fast to stabilize.

[0026] Retrieve the propulsion feedback resistance of the response construction domain in step S1, select the median of each propulsion feedback resistance as the resistance center value, and use the product of the resistance center value and the preset resistance multiplier coefficient as the propulsion feedback resistance threshold. The propulsion feedback resistance of the response construction domain is compared with the propulsion feedback resistance threshold to analyze the lateral constraint capability level of the response construction domain. If the propulsion feedback resistance is greater than the propulsion feedback resistance threshold, the response construction domain is determined to be in a high-constraint stress state, and the response construction domain has a strong reverse support capability for the propulsion component. Conversely, if the response construction domain is in a low-constraint stress state, the advancing load is more likely to slip and dissipate along the hole wall interface; When the springback convergence state of the response construction domain is a low convergence springback state and it is under low constraint stress state, the response construction domain is marked. Otherwise, do not mark the response construction domain.

[0027] It should be noted that the preset observation time can be set according to the soil layer type and the elastic-plastic recovery characteristics of the soil; the preset rebound convergence threshold can be set according to the statistical results of the rebound convergence index corresponding to the normal compaction domain; and the preset resistance multiplier coefficient can be set by statistically analyzing the fluctuation range and distribution pattern of the advance feedback resistance of each response construction domain during the pile test stage.

[0028] By triggering the unloading and rebound process through pressure release control, and constructing a rebound convergence index based on slip rebound data, the slip dissipation that is difficult to distinguish during the loading stage and the actual dense stress state can be separated and identified, providing clear screening objects and control basis for subsequent retrieval of neighborhood penetration resistance and adjustment of construction path and pressure distribution.

[0029] In step S3, after obtaining the marked response construction domain, the neighboring penetration resistance data of the marked response construction domain is retrieved from the construction monitoring information database to evaluate the compaction level of the surrounding area and generate the construction path sequence of the marked response construction domain.

[0030] It should be noted that the construction monitoring information database is a database used in the construction site data management system to store historical and real-time monitoring data, including the pile number, spatial coordinates, construction depth range, and corresponding penetration resistance data.

[0031] Penetration resistance data refers to the axial resistance value recorded by the penetration equipment within a unit penetration depth during the construction of compaction piles in plain soil. It is used to reflect the reverse resistance capability of the soil to the penetration member. The larger the value, the higher the compaction of the soil and the stronger the lateral restraint capability.

[0032] The neighborhood average penetration resistance is obtained by arithmetically averaging the neighborhood penetration resistance data of the marked response construction domain. The neighborhood average penetration resistance reflects the overall compaction level of the soil surrounding the marked response construction domain. The larger the value, the higher the overall compaction level of the surrounding soil.

[0033] Further calculation of the standard deviation of the penetration resistance in the neighborhood yields the penetration resistance dispersion coefficient. The penetration resistance dispersion coefficient reflects the dispersion of the soil density in the neighborhood. The larger the value, the stronger the uneven distribution of density within the surrounding area, indicating the existence of local loose areas or local high-density areas.

[0034] To comprehensively reflect the compaction level and uniformity of the surrounding area, a compaction level is constructed based on the average penetration resistance of the neighborhood and the penetration resistance dispersion coefficient, as shown in the following expression: ; in, To determine the density level of the enclosure, The average penetration resistance in the neighborhood. The penetration resistance dispersion coefficient, and These are the preset weighting coefficients.

[0035] The higher the value of the surrounding soil compaction level, the higher the degree of compaction and the more uniform the distribution of the surrounding soil; the lower the value of the surrounding soil compaction level, the lower the overall compaction or the uneven distribution of the compaction.

[0036] To eliminate the influence of differences in absolute resistance levels between different construction areas, the Min-Max normalization formula is used to normalize the extreme values ​​of the enclosure compaction level of the marked response construction sub-domain, resulting in a normalized enclosure compaction coefficient. The closer the normalized enclosure compaction coefficient is to 1, the higher the enclosure compaction level of the marked response construction sub-domain is in the current construction area; the closer the value is to 0, the lower the enclosure compaction level is.

[0037] After obtaining the normalized compaction coefficients of the construction domains for each marked response, the construction path sequence is generated by combining the rebound convergence index obtained in step S2. Specifically, a path priority evaluation function is constructed to calculate the path priority coefficients, with the following specific expression: ; in, This is the path priority coefficient. This is the normalized domain compactness coefficient. The rebound convergence index, and The preset path sorting weight coefficient is used to balance the influence of the density of the surrounding area and the degree of non-convergence of the rebound. The value reflects the relative looseness of the enclosure; the larger the value, the lower the density of the enclosure. The larger the value of the path priority coefficient, the more necessary it is for the marked response construction area to be in a relatively loose area of ​​the enclosure and to exhibit rebound non-convergence. Therefore, it is more necessary to prioritize adjusting the construction path to regulate its pressure.

[0038] All marked response construction domains are sorted from largest to smallest according to the path priority coefficient value to generate a construction path sequence. The sorting result is used to guide the spatial scheduling sequence of subsequent propulsion loading of the pressure expansion propulsion equipment, that is, pressure correction or path offset processing is preferentially applied to the marked response construction domains at the beginning of the path sequence.

[0039] Through the quantitative calculation and sorting generation mechanism of the aforementioned neighborhood penetration resistance data, the construction path sequence is objectively determined based on the surrounding area compaction level and rebound stability, thereby realizing the spatial reconstruction and loading sequence optimization of the borehole wall slip risk area.

[0040] In step S4, after obtaining the construction path sequence, the advancement loading pressure of each marker response construction domain is quantitatively corrected to achieve spatial redistribution of construction pressure.

[0041] The hydraulic pressure value corresponding to the current marked response construction sub-domain is collected in real time by pressure sensors installed in the working chamber of the propulsion cylinder. The average hydraulic pressure is obtained by calculating the average value of the hydraulic pressure value within the preset statistical time window of the current propulsion stage. The average hydraulic pressure is the reference value of the propulsion loading pressure of the current sub-domain. The larger the value, the higher the axial loading level applied to the sub-domain per unit time.

[0042] Access the equipment parameter configuration table to retrieve the effective pressure area of ​​the propulsion cylinder piston. Multiply the effective pressure area by the average hydraulic pressure to calculate the axial loading force of the current domain. The axial loading force reflects the actual axial force applied to the domain by the propulsion component. The larger the value, the stronger the compaction driving force generated on the soil.

[0043] It should be noted that the pressure sensor is a pressure detection element installed at the hydraulic pipeline node inside the working chamber of the propulsion cylinder, used to convert the unit area force generated by the hydraulic oil on the inner wall of the working chamber into a measurable electrical signal output; the equipment parameter configuration table is a structural parameter database deployed in the control system of the pressure diffusion propulsion equipment, used to store fixed structural parameters and calibration parameters related to the propulsion cylinder and hydraulic system.

[0044] Based on the construction path sequence generated in step S3, the marked response construction domains are sequentially numbered to obtain the domain sequence position. The earlier the domain sequence position, the higher the priority adjustment level.

[0045] To quantify the impact of path order on pressure distribution, a path weight coefficient is constructed based on the domain order, with the specific expression as follows: ; in, This is the path weight coefficient. To mark the total number of response construction domains, This is the domain order.

[0046] The path weight coefficient (0,1] indicates that the closer the value is to 1, the higher the priority of the marked response construction domain in the path sequence, and the pressure correction should be performed first.

[0047] Based on the path weight coefficient and the path priority coefficient, a domain allocation coefficient is constructed, expressed as follows: ; in, For the domain allocation coefficient, This is the path weight coefficient. This is the path priority coefficient.

[0048] The regional allocation coefficient is a dimensionless parameter. A value greater than 1 indicates that the advance loading pressure of the marked response construction region needs to be increased. To prevent local overload, a maximum allowable allocation upper limit coefficient is set. When the regional allocation coefficient is greater than the maximum allowable allocation upper limit coefficient, the regional allocation coefficient is taken to be equal to the maximum allowable allocation upper limit coefficient.

[0049] It should be noted that the maximum allowable adjustment limit coefficient is determined based on the difference between the safe limit pressure of the hydraulic system and the original propulsion loading pressure of the current domain. Specifically, the rated safe limit pressure of the equipment is taken as the upper limit value that cannot be exceeded. The ratio of this upper limit value to the average hydraulic pressure of the current domain is calculated to obtain the theoretical increase factor. On this basis, a preset safety margin is retained, and the factor that does not exceed the range of this safety margin is taken as the maximum allowable adjustment limit coefficient.

[0050] Multiply the zonal adjustment coefficient by the original propulsion loading pressure to obtain the corrected propulsion loading pressure. At the same time, the corresponding corrected axial loading force is the corrected propulsion loading pressure multiplied by the effective pressure-bearing area of ​​the propulsion cylinder piston.

[0051] Among them, the corrected propulsion loading pressure is the target loading pressure after pressure redistribution for the marked response construction zone. The larger the value, the higher the axial compaction energy applied to the marked response construction zone to overcome the energy dissipation caused by the hole wall slip interface; the closer the value is to the original pressure, the lower the risk level of the marked response construction zone.

[0052] The corrected propulsion loading pressure is used as the target pressure setting value of the propulsion cylinder. The opening of the hydraulic proportional valve is adjusted through a closed-loop control algorithm so that the actual hydraulic pressure converges to the corrected propulsion loading pressure.

[0053] It should be noted that the closed-loop control algorithm is a pressure tracking control logic embedded in the controller of the pressure diffusion propulsion equipment, which is used to converge the actual hydraulic pressure to the target pressure.

[0054] By using the aforementioned domain allocation mechanism based on path sequence, rebound convergence index and surrounding compaction coefficient, the dynamic optimization distribution of construction pressure among construction domains with different marked responses is achieved. This allows axial compaction energy to preferentially act on high-risk areas with hole wall slippage interfaces, thereby reducing the proportion of slippage dissipation along the hole wall and improving the compaction uniformity and overall stability of the soil compaction pile formation area.

[0055] Finally, it should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0056] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0057] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] In this document, the singular forms “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that terms such as “comprising / including” or “having” specify the presence of the stated features, integrals, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integrals, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0059] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0060] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0061] The above description of the disclosed embodiments will enable those skilled in the art to make or use various modifications to these embodiments. It will be readily apparent to those skilled in the art that the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for adjusting pressure distribution during compaction pile construction in plain soil, characterized in that: Includes the following steps: Step S1: When compaction construction is carried out in the area to be compacted, monitor the hydraulic flow data of the compressive expansion propulsion equipment and analyze the hydraulic drive characteristics. Based on the hydraulic drive characteristics, divide the area to be compacted into response construction domains and detect the propulsion feedback resistance of the response construction domains. Step S2: Perform pressure release control processing on the response construction sub-domain, set the observation time, collect the slip rebound data of the response construction sub-domain within the observation time, analyze the rebound convergence state using the slip rebound data, and filter and mark the response construction sub-domains in combination with the propulsion feedback resistance. Step S3: Access the construction monitoring information database to retrieve the neighborhood penetration resistance data of the marked response construction sub-domain, evaluate the compaction level of the surrounding area based on the neighborhood penetration resistance data, and generate the construction path sequence of the marked response construction sub-domain. Step S4: Detect the advancement loading pressure of the marked response construction domain, set the domain allocation coefficient according to the construction path sequence, and use the domain allocation coefficient to correct the advancement loading pressure of the marked response construction domain.

2. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 1, characterized in that: In step S1, when the compressive expansion propulsion equipment performs compaction construction on the soil compaction piles in the area to be compacted, the flow rate acquisition cycle is preset and divided into multiple acquisition times. The instantaneous volumetric flow rate of the pressure diffuser propulsion device is monitored by a flow sensor at each acquisition time, and the instantaneous volumetric flow rate is used as hydraulic flow data. The hydraulic flow data are sorted in ascending order according to their numerical values ​​and combined into a hydraulic flow set. A first quantile ratio and a second quantile ratio are preset. The corresponding number of hydraulic flow data in the hydraulic flow set are selected according to the first quantile ratio and the second quantile ratio respectively. The flow quantile width is calculated based on the selection results. The ratio of the flow quantile width to the preset flow acquisition period is used as the hydraulic drive characteristic of the soil compaction pile.

3. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 2, characterized in that: In step S1, the hydraulic drive characteristics are compared with the preset hydraulic drive threshold to divide the area to be compacted into response construction domains. If the hydraulic drive characteristics are greater than the preset hydraulic drive threshold, then the plain soil compaction pile will be used as the response construction domain. Conversely, compaction piles in plain soil are not considered as part of the response construction zone; The hydraulic pressure value of the working chamber of the propulsion cylinder is detected by the pressure sensor inside the propulsion cylinder cavity in the pressure diffusion propulsion equipment, and the effective pressure-bearing area of ​​the propulsion cylinder piston is retrieved by accessing the equipment parameter configuration table. The product of the hydraulic pressure value and the effective pressure area of ​​the piston in the propulsion cylinder is used as the propulsion feedback resistance in the response construction zone.

4. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 1, characterized in that: In step S2, pressure relief control is performed on the response construction zone. Specifically, for the response construction zone, the propulsion cylinder in the pressure diffusion propulsion device is stopped from moving forward, and the loading pressure in the working chamber is released at the same time. The observation time is preset and divided into multiple observation moments. At each observation moment, the axial displacement of the propulsion component in the compressive diffusion propulsion device is collected by the displacement sensor in the axial direction. The difference between the axial displacements of adjacent observation moments is calculated to obtain the slippage and rebound data. After sorting the slip rebound data in chronological order, they are combined into a slip rebound sequence. In the slip rebound sequence, the cumulative rebound displacement value corresponding to the current observation time is calculated by using the slip rebound data of the current observation time and the previous observation time. The observation time corresponding to the maximum absolute value of the cumulative rebound displacement is marked, and the residual rebound fluctuation is calculated from the slip rebound data after the marked observation time.

5. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 4, characterized in that: In step S2, the ratio of the residual rebound fluctuation to the maximum absolute value of the cumulative rebound displacement is used as the rebound convergence index. If the rebound convergence index is greater than the preset rebound convergence threshold, the rebound convergence state of the response construction domain is a low-convergence rebound state. Conversely, the rebound convergence state of the response construction domain is a high-convergence rebound state. The propulsion feedback resistance threshold is calculated based on each propulsion feedback resistance. If the propulsion feedback resistance is greater than the propulsion feedback resistance threshold, the response construction domain is determined to be in a state of high constraint stress. Conversely, if the response construction domain is determined to be in a low-constraint stress state; When the springback convergence state of the response construction domain is a low convergence springback state and it is under low constraint stress state, the response construction domain is marked. Otherwise, do not mark the response construction domain.

6. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 5, characterized in that: In step S3, after obtaining the marked response construction domain, the neighboring penetration resistance data of the marked response construction domain is retrieved from the construction monitoring information database. The construction monitoring information database is a database used in the construction site data management system to store historical and real-time monitoring data; Penetration resistance data refers to the axial resistance value recorded by the penetration equipment within a unit penetration depth during the construction of compaction piles in plain soil. The neighborhood average penetration resistance is obtained by arithmetically averaging the neighborhood penetration resistance data of the marked response construction domain. The standard deviation of the neighborhood penetration resistance is further calculated to obtain the penetration resistance dispersion coefficient.

7. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 6, characterized in that: In step S3, the compactness level of the surrounding area is constructed by weighted difference method based on the neighborhood average penetration resistance and the penetration resistance dispersion coefficient; The Min-Max normalization formula was used to normalize the extreme values ​​of the compaction level of the marked response construction domain to obtain the normalized compaction coefficient. Based on the normalized domain compactness coefficient and the springback convergence index, a path priority evaluation function is constructed using a weighted summation method to calculate the path priority coefficient; All marked response construction domains are sorted from largest to smallest according to the path priority coefficient value to generate the construction path sequence.

8. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 1, characterized in that: In step S4, the hydraulic pressure value corresponding to the current marked response construction domain is collected in real time by a pressure sensor installed in the working chamber of the propulsion cylinder. Access the equipment parameter configuration table to retrieve the effective pressure area of ​​the propulsion cylinder piston, and multiply the effective pressure area by the average hydraulic pressure to calculate the axial loading force of the current domain; Based on the construction path sequence generated in step S3, the marked response construction domains are sequentially numbered to obtain the domain sequence position. Constructing path weight coefficients based on domain order: ; in, This is the path weight coefficient. To mark the total number of response construction domains, This is the domain order.

9. The pressure distribution adjustment method for compaction pile construction in plain soil according to claim 8, characterized in that: In step S4, based on the path weight coefficient and the path priority coefficient, the domain allocation coefficient is constructed: ; in, For the domain allocation coefficient, This is the path weight coefficient. This is the path priority coefficient; Set a maximum allowable allocation limit coefficient. When the regional allocation coefficient is greater than the maximum allowable allocation limit coefficient, set the regional allocation coefficient to be equal to the maximum allowable allocation limit coefficient. The domain allocation coefficient is multiplied by the original propulsion loading pressure to obtain the corrected propulsion loading pressure. The corrected propulsion loading pressure is used as the target pressure setpoint of the propulsion cylinder. The opening of the hydraulic proportional valve is adjusted through a closed-loop control algorithm so that the actual hydraulic pressure converges to the corrected propulsion loading pressure.

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