A method and control system for staged grouting of pile tips

Abstract

This application provides a method and control system for staged grouting at the pile tip, relating to the field of intelligent grouting technology. The method includes first obtaining a first proportion and quantity of grouting material; then, under a preset first pressure, the first grouting material is permeated into the formation at low pressure through a first grouting port 16, while simultaneously monitoring the permeability coefficient. A second permeability coefficient is determined based on the permeability coefficient or material consumption, and the second quantity and proportion are adjusted accordingly. Next, a second grouting material is diffused at medium pressure through the first grouting port 16 and the second grouting port 15 under a preset second pressure, and the permeability coefficient is monitored again. A third permeability coefficient is determined based on conditions, and the third quantity and proportion are adjusted accordingly. Finally, the third grouting material is high-pressure compacted into the formation through three grouting ports under a preset third pressure. Implementing this method achieves staged and precise control of grouting, allowing the grout to better fill the formation pores and enhance the bonding force between the pile tip and the formation.

Description

Technical Field

[0001] This application relates to the field of intelligent grouting technology, and in particular to a pile end graded grouting method and control system. Background Technology

[0002] Post-grouting technology at the pile tip enhances the bond between the pile and the soil, and improves the bearing capacity of the pile foundation by injecting grout into the pile tip. It is widely used in high-rise buildings, bridges and other projects. Its core principle is to use pressure to penetrate the grout into the pores or fissures of the soil at the pile tip, forming a "pile-grout-soil" composite system, thereby improving the performance of the pile foundation.

[0003] Currently, the common method for pile end grouting involves pre-determining the mix ratio and quantity of grouting material before construction, injecting the grouting material into the grouting pipe at a fixed pressure, and then grouting the surrounding strata through the grouting port on the grouting pipe. During the grouting process, the grouting operation is usually completed according to pre-set parameters, with the aim of reinforcing the strata and improving the performance of the pile foundation.

[0004] However, traditional grouting methods struggle to address heterogeneous geological formations (such as the coexistence of sand and clay layers), leading to rapid grout loss along high-permeability paths (such as in gravel layers) or stagnation in low-permeability areas (such as in clay layers), resulting in large-area grouting blind spots. Engineering statistics show that traditional grout coverage is only 50%–70%, the increase in pile end resistance is less than 30%, and the settlement at the pile top exhibits significant dispersion. Summary of the Invention

[0005] This application provides a pile-end graded grouting method and control system for realizing staged grouting and real-time dynamic adjustment of grouting parameters, enabling precise grouting of strata with different characteristics and effectively improving grout coverage.

[0006] In a first aspect, this application provides a method for graded grouting at the pile end, the method comprising: obtaining a first proportion and a first quantity of grouting material, wherein the proportion is the volume ratio of solid material to liquid material; injecting the first quantity and the first proportion of grouting material into a grouting pipe at a preset first pressure, so that the first grouting material permeates into the surrounding strata at low pressure through a first grouting port 16 in the grouting pipe, and monitoring the permeability coefficient in real time; if the permeability coefficient is lower than a preset first permeability coefficient threshold, or the first quantity and the first proportion of grouting material are consumed, then determining the current permeability coefficient as a second permeability coefficient; adjusting the first quantity and the first proportion in conjunction with the second permeability coefficient to obtain a second quantity and a second proportion; and injecting the first quantity and the first proportion of grouting material into the grouting pipe at a preset second pressure. The second quantity and second ratio of grouting material are injected to allow the second grouting material to diffuse under medium pressure into the surrounding strata through the first grouting port 16 and the second grouting port 15 in the grouting pipe, and the permeability coefficient is monitored in real time. If the permeability coefficient is lower than the preset second permeability coefficient threshold, or the second quantity and second ratio of grouting material are consumed, the permeability coefficient at the current moment is determined to be the third permeability coefficient. Based on the third permeability coefficient, the second quantity and the second ratio are adjusted to obtain the third quantity and the third ratio. The third quantity and the third ratio of grouting material are injected into the grouting pipe according to the preset third pressure, so that the third grouting material is compressed under high pressure into the surrounding strata through the first grouting port 16, the second grouting port 15 and the third grouting port 14 in the grouting pipe.

[0007] By adopting the above technical solution, the graded grouting method at the pile tip employs a graded grouting approach of low-pressure infiltration, medium-pressure diffusion, and high-pressure compaction. First, the first grouting material is infiltrated at low pressure using a first pressure, and the permeability coefficient is monitored. Then, the mix ratio and quantity are adjusted according to the permeability coefficient. A second pressure is used for medium-pressure diffusion, and finally, a third pressure is used for high-pressure compaction. This allows for precise control of the grouting process in stages, based on the actual geological conditions. The combination of different pressures and grouting materials enables the grout to better fill the pores in the strata, enhancing the bond between the pile tip and the strata, improving the bearing capacity of the pile foundation, effectively improving the stress performance of the pile tip, and ensuring the stability and reliability of the pile foundation project.

[0008] In conjunction with some embodiments of the first aspect, in some embodiments, obtaining the first proportion and first quantity of grouting material includes: obtaining the first permeability coefficient and first soil composition data of the construction area; inputting the first permeability coefficient and the first soil composition data into the pile end grouting coefficient determination model to obtain the first proportion and the first quantity of grouting material, wherein the pile end grouting coefficient determination model is constructed in advance by deep learning based on multiple permeability coefficient sets and soil composition datasets labeled with proportion and quantity.

[0009] By adopting the above technical solution, the grouting material parameters obtained are more in line with actual needs due to the consideration of the specific geological conditions of the construction area, avoiding material waste or shortage, ensuring grouting effect, enabling the grouting material to better adapt to the stratum characteristics, and improving grouting quality and pile foundation construction efficiency.

[0010] In some embodiments of the first aspect, adjusting the first quantity and the first ratio based on the second permeability coefficient to obtain a second quantity and a second ratio includes: if the second permeability coefficient is greater than the first permeability coefficient threshold, calculating a first difference between the second permeability coefficient and the first permeability coefficient threshold; when the first difference is greater than a set first difference threshold, determining the second quantity as the first quantity multiplied by a preset first multiple, and increasing the proportion of solid material in the first ratio by a preset first solid material proportion to determine the second ratio; when the first difference is not greater than the set first difference threshold, determining the second quantity as the first quantity multiplied by a preset second multiple, and increasing the proportion of solid material in the first ratio by a preset second solid material proportion to determine the second ratio; if the second permeability coefficient is not greater than the first permeability coefficient threshold, determining the second quantity as the first quantity multiplied by a preset third multiple, and increasing the proportion of solid material in the first ratio by a preset third solid material proportion to determine the second ratio.

[0011] By adopting the above technical solution, and combining the adjustment of the first quantity and first ratio with the second permeability coefficient, different adjustment strategies are employed based on the relationship and difference between the second and first permeability coefficient thresholds. If the permeability coefficients differ, the quantity and solid phase material ratio are adjusted according to corresponding rules. This dynamic adjustment method allows for flexible changes in the amount and ratio of grouting materials based on variations in the formation permeability coefficient during grouting. When the permeability coefficient is high, increasing the quantity and solid phase ratio enhances the grouting effect; conversely, reasonable adjustments can be made to ensure effective grout filling, achieving refined control of the grouting process and improving grouting quality and engineering benefits.

[0012] In some embodiments of the first aspect, the adjustment of the second quantity and the second ratio based on the third permeability coefficient to obtain the third quantity and the third ratio includes: if the third permeability coefficient is greater than the second permeability coefficient threshold, calculating a second difference between the third permeability coefficient and the second permeability coefficient threshold; when the second difference is greater than a set second difference threshold, determining the third quantity to be the second quantity multiplied by a preset fourth multiple, and increasing the proportion of solid material in the second ratio by a preset fourth solid material proportion; when the second difference is not greater than the set second difference threshold, determining the third quantity to be the second quantity multiplied by a preset fifth multiple, and increasing the proportion of solid material in the second ratio by a preset fifth solid material proportion; if the third permeability coefficient is not greater than the second permeability coefficient threshold, then the third quantity to be the second quantity multiplied by a preset sixth multiple, and decreasing the proportion of solid material in the second ratio by a preset sixth solid material proportion.

[0013] By adopting the above technical solution, adjustments are made based on the relationship and difference between the third permeability coefficient and the threshold of the second permeability coefficient. During the high-pressure compaction stage, the grouting material parameters are adjusted in a timely manner according to the feedback from the permeability coefficient. When the permeability coefficient reflects different stratum filling conditions, the quantity and proportion of solid phase material are changed to enable the third grouting material to better achieve the high-pressure compaction effect, further enhancing the compaction of the soil at the pile tip, improving the bearing capacity of the pile foundation, and ensuring the quality and stability of the project.

[0014] In conjunction with some embodiments of the first aspect, in some embodiments, the first grouting port 16 is located at the bottom of the grouting pipe and has a beveled cut with a set cutting angle, the cutting angle being the angle between the plane where the beveled cut is located and the horizontal plane.

[0015] By adopting the above technical solution, this design allows the grout to be sprayed obliquely from the bottom. Compared with a vertical cut, this expands the diffusion range of the grout in the bottom stratum, allowing the grout to penetrate more evenly into the stratum surrounding the pile tip. The spray angle generated by the oblique cut can exert a certain squeezing effect on the soil at the pile tip, which helps to improve the compaction of the soil at the pile tip and enhance the contact effect between the pile tip and the stratum.

[0016] In conjunction with some embodiments of the first aspect, in some embodiments, the second grouting port 15 is located above the first grouting port 16, and when the grouting pressure is greater than the first valve pressure threshold of the second grouting port 15, the first valve is automatically opened.

[0017] By adopting the above technical solution, during the grouting process, as the pressure gradually increases, the second grouting port 15 opens when it reaches the set threshold. At this point, the medium-pressure stage begins, and the grout diffuses into the formation through the first and second grouting ports 15. This pressure-controlled automatic opening method enables the grouting process to proceed in stages and in an orderly manner, allowing the grout to be injected into the formation from different locations under appropriate pressure, expanding the grout diffusion range, ensuring that all parts of the formation can be effectively grouted, and improving the uniformity and effectiveness of grouting.

[0018] In conjunction with some embodiments of the first aspect, in some embodiments, the third grouting port 14 is located above the second grouting port 15, and when the grouting pressure is greater than the second valve pressure threshold of the third grouting port 14, the second valve is automatically opened.

[0019] By adopting the above technical solution, during the high-pressure compaction stage, after the pressure reaches the threshold, the third grouting port 14 opens, and the grout is compacted into the stratum under high pressure through the three grouting ports. The coordination of the three grouting ports allows the grout to fill the stratum over a larger area and under higher pressure, further improving the compaction of the soil. The setting of grouting ports at different heights can effectively compact strata at different depths, making the soil around the pile tip more uniformly stressed.

[0020] In a second aspect, this application provides a graded grouting control system, which includes: one or more processors and a memory; the memory is coupled to the one or more processors, and the memory is used to store computer program code, which includes computer instructions, and the one or more processors call the computer instructions to cause the graded grouting control system to perform the method described in the first aspect and any possible implementation thereof.

[0021] Thirdly, this application provides a computer-readable storage medium including instructions that, when executed on a graded grouting control system, cause the graded grouting control system to perform the method described in the first aspect and any possible implementation thereof.

[0022] Fourthly, this application provides a computer program product that, when run on a graded grouting control system, causes the graded grouting control system to perform the method described in the first aspect and any possible implementation thereof.

[0023] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0024] 1. By adopting a phased grouting technique based on different pressures and adjusting the grouting material ratio and quantity according to the real-time monitoring of the permeability coefficient, the technical problem of poor grout filling effect and insufficient pile bearing capacity caused by the inability to accurately control the grouting process according to the actual situation of the stratum in the existing technology is effectively solved. This enables the grout to better fill the stratum pores, enhance the bonding force between the pile end and the stratum, significantly improve the pile bearing capacity, and effectively improve the stress performance of the pile end.

[0025] 2. By adopting the technical means of setting the second grouting port 15 above the first grouting port 16 and controlling its automatic opening through a pressure threshold to achieve staged grouting, the technical problem of the grouting process not being able to be carried out in stages and in an orderly manner in the existing technology, resulting in uneven grout diffusion and poor grouting effect, is effectively solved. This enables the grout to be injected into the formation from different positions under appropriate pressure, expands the grout diffusion range, ensures that all parts of the formation can be effectively grouted, and improves the uniformity and effect of grouting.

[0026] 3. By adopting the technical means of setting the third grouting port 14 above the second grouting port 15 and controlling its automatic opening by setting the pressure threshold of the second valve, and cooperating with the first and second grouting ports 15 to achieve multi-port coordinated grouting in the high-pressure stage, the technical problems of the existing technology of single grouting port layout and inability to efficiently compact strata at different depths, resulting in insufficient soil compaction at the pile tip and limited pile bearing capacity, are effectively solved. This enables the grout to fill the strata in a larger range and under higher pressure, accurately and effectively compact strata at different depths, make the soil around the pile tip more uniformly stressed, and improve the bearing capacity and overall stability of the pile foundation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an application of a graded grouting control system using the method described in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of an implementation scenario in the graded grouting process of the method in the embodiments of this application;

[0029] Figure 3 This is a schematic flowchart of a graded grouting method at the pile end in an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the physical device structure of a graded grouting control system in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures

[0032] 1. Control panel; 2. Hydraulic pump; 3. Hydraulic oil converter; 4. Grouting valve; 5. Grout storage tank; 6. Grout pipe; 7. Connecting hose; 8. Rigid multi-port pipe; 9. Quick-connect assembly; 10. Piston rod; 11. Oil inlet pipe; 12. Oil return pipe; 13. Model pile; 14. Third grouting port; 15. Second grouting port; 16. First grouting port; 17. Annular chassis. Detailed Implementation

[0033] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this application refers to and includes any or all possible combinations of one or more of the listed items.

[0034] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0035] For ease of understanding, the graded grouting control system used in the method provided in this embodiment is described below. Please refer to [link / reference]. Figure 1 This is a schematic diagram of an application of a graded grouting control system according to the method of this application embodiment.

[0036] The graded grouting control system is the core of the graded grouting method at the pile end. Through hardware integration and software algorithm synergy, it achieves fully automated control of the entire process from data input and parameter calculation to grouting execution. In such cases... Figure 1In the device shown, after completing the pre-grouting preparations, the operator inputs data such as the initial permeability coefficient and soil composition of the stratum through the control panel 1 of the built-in control module (this data can be collected in advance by sensors). The control module calls the built-in algorithm to generate the first mix ratio (solid / liquid volume ratio) and the first grouting volume. The control module sends instructions to the hydraulic pump 2 and the hydraulic oil converter 3 to set the first pressure (low pressure) and open the grouting valve 4. The grout flows from the grout storage tank 5 (which includes at least a solid material tank, such as cement, additives, and other powdered substances; and a liquid material tank, such as water, admixture solutions, etc.) through the grout outlet pipe 6, the connecting hose 7 in the connecting module, and the rigid multi-port pipe 8, and is quickly assembled and disassembled through the quick-connect assembly 9, facilitating flexible configuration and maintenance of the device. The oil inlet pipe 11 and the oil return pipe 12 are connected to the hydraulic system. The oil inlet pipe 11 delivers hydraulic oil to the hydraulic oil converter 3 to provide power to the device, while the oil return pipe 12 allows the hydraulic oil to flow back, forming a circulation. The piston rod 10, in conjunction with the hydraulic system, can be used to control the movement of certain components or adjust parameters such as pressure. An intelligent mixer is integrated at the front end of the grout outlet pipe 6 or in the connecting module. This intelligent mixer communicates with the control module, which adjusts the feed ratio of solid and liquid phase materials to generate the required grout ratio in real time. For example, a built-in screw feeder controls the solid phase material delivery rate, while a flow meter and solenoid valve control the liquid phase material flow rate, thus initiating the grouting process. Subsequently, the control module dynamically adjusts the grout ratio and quantity based on permeability sensor data from a preset position sensor, and adaptively adjusts the corresponding grouting pressure to achieve precise layered grouting under different geological conditions.

[0037] One specific application scenario of the subsequent staged grouting process is as follows: Figure 2 As shown. Please refer to [the original text]. Figure 2 This is a schematic diagram of an implementation scenario in the graded grouting process of the method in this application.

[0038] exist Figure 2 In the model pile 13, three sets of grouting ports can be set along the axial direction on the outer wall of the grouting steel pipe, forming a progressive grouting structure:

[0039] First grouting port 16: Located at the bottom of the grouting steel pipe, it adopts an adjustable angled cut, such as 45°. There is no angle limit here. Its function is to allow the grout to penetrate into the bearing layer of the pile end in an angled spray manner during the low-pressure stage, thereby expanding the initial diffusion range.

[0040] Second grouting port 15: Located above the first grouting port 16 Distance ( (Adjustable according to formation characteristics), rectangular or circular grouting holes are used for secondary grouting during the medium-pressure stage.

[0041] Third grouting port 14: Located above the second grouting port 15 Distance ( ≥ (The spacing between the two grouting ports can be adjusted according to actual needs.) The structure can be similar to the second grouting port 15, or other shapes can be used. This is not limited here. It is used for deep penetration in the high-pressure compaction stage.

[0042] Each grouting port is equipped with an independent electrically controlled valve, consisting of the following components: a pressure sensor for real-time monitoring of the internal pressure of the grouting port and feedback to the control module; an electric actuator for adjusting the valve opening according to the control module's instructions; and a sealing component using a high-pressure resistant rubber sealing ring to ensure no grout leakage. When the pressure sensor at the corresponding valve of each grouting port detects that the current pressure reaches the pressure threshold of the corresponding grouting port, the valve automatically opens, facilitating the flow of grout from the grouting port. Specifically, when the grouting pressure is greater than the first valve pressure threshold of the second grouting port 15, the first valve automatically opens; when the grouting pressure is greater than the second valve pressure threshold of the third grouting port 14, the second valve automatically opens. The first valve pressure threshold (low-pressure threshold) corresponds to the opening pressure of the first grouting port 16, ensuring that the grout slowly penetrates the underlying soil under low pressure. The second valve pressure threshold (medium-pressure threshold) corresponds to the opening pressure of the second grouting port 15 and must be higher than the low-pressure threshold to ensure that the grout overcomes shallow resistance and diffuses during the medium-pressure stage. The third valve pressure threshold (high pressure threshold), corresponding to the opening pressure of the third grouting port 14, must be significantly higher than the medium pressure threshold, and is used for high-pressure compaction of deep soil.

[0043] When the grouting pressure reaches the corresponding stage threshold (e.g., first pressure → second pressure → third pressure), the control module sequentially triggers the valves to open: low pressure stage: only the first grouting port 16 is opened; medium pressure stage: both the first and second grouting ports 15 are opened simultaneously; high pressure stage: all three grouting ports are opened. The grout flow distribution at each grouting port is precisely controlled by the valve opening degree (e.g., the flow rate at the third grouting port 14 accounts for 40% in the high pressure stage), achieving a layered grouting effect.

[0044] In this embodiment, an annular base plate 17 can also be provided and welded to the bottom of the grouting steel pipe to disperse the grouting pressure and prevent the steel pipe from sinking or tilting. Specific connecting components can also be provided on the annular base plate 17 to provide stable support for the grouting steel pipe, ensure that the relative positions of each grouting steel pipe are fixed, and make the grout spread evenly in the formation to improve the grouting effect.

[0045] For ease of understanding, the method provided in this embodiment will be described in process below with reference to the above-described apparatus and scenario. Please refer to [link / reference]. Figure 3 This is a schematic flowchart of a graded grouting method at the pile end in an embodiment of this application.

[0046] S301. Obtain the first proportion and first quantity of grouting material, wherein the proportion is the volume ratio of solid material to liquid material;

[0047] Among them, grouting material refers to composite materials used for pile end grouting, which are composed of solid phase materials (such as cement, fly ash, sand and other granular substances) and liquid phase materials (such as water, water-reducing agents, expansion agents and other liquid additives). The volume ratio of the two phases determines the fluidity, strength and permeability of the grout. The first ratio refers to the volume ratio of solid phase materials to liquid phase materials in the initial stage, and the first quantity indicates the total volume of grout required under this ratio.

[0048] Specifically, the tiered grouting control system executes this step before the grouting operation begins, requiring the determination of initial grouting parameters based on geological survey data of the construction area. First, the system acquires the first permeability coefficient (reflecting the stratum porosity and grout penetration difficulty) and the first soil layer composition data (e.g., 40% clay and 60% sand) of the construction area through built-in sensors or external devices. Then, this data is input into the pile tip grouting coefficient determination model. This model is based on a deep learning-trained neural network, pre-constructed using multiple permeability coefficient and soil composition datasets labeled with proportions and quantities. Parameters have been optimized using historical engineering data (e.g., optimal proportions and quantities for different soil layers). For example, if the input data shows the stratum is predominantly high-permeability sand, the model might output a first proportion of 1:2 (high liquid phase ratio to improve fluidity) and a first quantity of 15 cubic meters to ensure rapid grout penetration into the sand pores. If the stratum is low-permeability clay, the model might adjust to a 3:2 high solid phase ratio to reduce grout loss.

[0049] S302. According to the preset first pressure, inject the first amount and the first ratio of the first grouting material into the grouting pipe so that the first grouting material can permeate into the surrounding strata at low pressure through the first grouting port 16 in the grouting pipe, and monitor the permeability coefficient in real time.

[0050] The preset first pressure represents a low-pressure grouting pressure pre-set according to the formation characteristics, used to promote the slow penetration of grout. The grouting pipe is a steel pipe embedded at the pile end, with a first grouting port 16 (such as a 45° oblique cut) at its bottom for directional injection of grout. Low-pressure penetration refers to allowing the grout to naturally seep into the formation pores under low pressure, avoiding formation fracturing caused by high pressure. The permeability coefficient is monitored in real time by sensors installed in the grouting pipe or formation, reflecting the diffusion efficiency of the grout in the formation.

[0051] Specifically, after the system completes the parameter calculation for S301, it enters the low-pressure permeation stage. This stage is suitable for the initial stage of grouting operations, aiming to establish a preliminary grout diffusion path around the pile tip. The system first sends a command to the hydraulic pump 2 to adjust the grouting pressure to the preset first pressure. Simultaneously, it controls the grout storage tank 5 to deliver solid and liquid materials according to the first ratio—solid materials are conveyed via a screw feeder, and the flow rate of liquid materials is controlled by a solenoid valve. After being uniformly mixed in a mixer, they are conveyed to the grouting pipe via the grout outlet pipe 6 and the connecting module. The first grouting port 16 at the bottom of the grouting pipe opens under low pressure, and the grout is sprayed into the stratum at an inclined angle: in sand layers, the grout slowly diffuses along the gaps between sand grains, forming a permeation zone; in clay layers, the grout needs to squeeze out the water between clay particles to gradually permeate, resulting in a slower diffusion rate. During this process, the system collects data every second through a permeability coefficient sensor to monitor the grout permeation rate in real time, and simultaneously records the total amount of grout injected through a flow sensor to ensure a smooth grouting process. The permeability sensor can be installed in the bearing layer at the pile end, usually at different depths within a range of 0.5-1 meter around the grouting pipe, to directly monitor the diffusion of grout inside the stratum and avoid interference from pressure fluctuations inside the grouting pipe on the data.

[0052] S303. If the permeability coefficient is lower than the preset first permeability coefficient threshold, or the first quantity and first ratio of grouting material are consumed, then the permeability coefficient at the current moment is determined to be the second permeability coefficient.

[0053] The preset first permeability coefficient threshold is a critical value set by the control system based on the formation type and engineering requirements, used to determine the effectiveness of the initial grouting. For example, for sand layers, the threshold might be set to 0.005 m / s. If the actual permeability coefficient is lower than this value, it indicates insufficient grout diffusion, possibly due to encountering clay layers or an unreasonable grout mix ratio. For clay layers, the threshold might be set to 0.0005 m / s; a value below this indicates poor grout penetration. The first quantity of grouting material being consumed means that the total amount of grout mixed according to the initial ratio has been injected into the formation. At this point, regardless of whether the permeability coefficient meets the standard, subsequent parameters need to be adjusted according to the actual situation. The second permeability coefficient is the instantaneous permeability coefficient value triggered by the adjustment conditions, used to reflect the current true permeability state of the formation.

[0054] Specifically, this step continues during the low-pressure permeation stage, with the control system monitoring two key conditions in real time: whether the permeability coefficient is below a threshold and whether the grout has been exhausted. For example, when grouting sand layers, if the system detects that the permeability coefficient gradually decreases from the initial 0.01 m / s to 0.004 m / s (below the threshold of 0.005 m / s), it indicates that there may be clay interlayers in the formation, hindering grout diffusion. In this case, the system will immediately record the current permeability coefficient of 0.004 m / s as the second permeability coefficient and trigger the parameter adjustment process. Similarly, when grouting clay layers, if the permeability coefficient is 0.0006 m / s (above the threshold of 0.0005 m / s) after all 10 cubic meters of grout have been injected, it indicates that the formation has absorbed most of the grout. The system will also record this value as the second permeability coefficient and prepare to proceed to the next stage. In actual operation, these two conditions may be triggered individually or simultaneously. In either case, the system will pause the current grouting and recalculate subsequent parameters based on the second permeability coefficient to adapt to the actual changes in the formation.

[0055] S304. Based on the second permeability coefficient, adjust the first quantity and the first ratio to obtain the second quantity and the second ratio;

[0056] The second permeability coefficient reflects the current formation's actual capacity to accept the grout. The first quantity and first ratio are the initial grouting parameters, which may need optimization due to formation changes or material depletion. The second quantity is the adjusted total grout volume, and the second ratio is the adjusted solid-to-liquid material ratio. The goal of this adjustment is to address issues such as grout loss, insufficient diffusion, or formation saturation that occurred during the initial grouting process. For example, if the second permeability coefficient indicates poor formation permeability, it may be necessary to increase the proportion of solid materials to improve grout viscosity and reduce loss; if the formation permeability is good, it may be necessary to increase the total grout volume to fully fill the pores.

[0057] The more specific adjustment process is as follows: If the second permeability coefficient is greater than the first permeability coefficient threshold, then the first difference between the second permeability coefficient and the first permeability coefficient threshold is calculated. This first difference is the gap between the actually measured second permeability coefficient and the preset threshold, reflecting the deviation between the actual permeability capacity of the formation and the expected value. Specifically, this step is automatically triggered after the low-pressure permeation stage ends. The control system first retrieves the second permeability coefficient recorded during the low-pressure stage and the preset first permeability coefficient threshold, and obtains the first difference through subtraction. The purpose of this calculation is to quantify the effectiveness of grout diffusion during the low-pressure stage, providing a basis for subsequent parameter adjustments. For example, in a sandy gravel formation, if the grout permeation rate during the low-pressure stage is faster than expected, it indicates high formation porosity, and the first difference needs to be used to determine whether a significant increase in grouting volume or adjustment of the mix ratio is necessary.

[0058] When the first difference exceeds a set first difference threshold, the second quantity is determined to be the first quantity multiplied by a preset first multiple, and the proportion of solid material in the first mix ratio is increased by a preset first solid material proportion to determine the second mix ratio. The set first difference threshold is a built-in judgment standard of the control system, used to distinguish between situations where the permeability is "significantly higher than expected" and "slightly higher than expected." The preset first multiple is an amplification factor used to calculate the second grouting volume. The preset first solid material proportion refers to the increase in the volume ratio of solid material in the grout. For example, if the first quantity is 10 cubic meters and the first mix ratio is 1:2 (solid proportion 33.3%), when the first difference is 0.003 m / s (>0.002 m / s), the second quantity = 10 × 1.5 = 15 cubic meters, and the solid proportion increases to 33.3% + 20% = 53.3% (mix ratio adjusted to 1.6:2). Specifically, this step is applicable to scenarios with a large first difference, indicating that the formation permeability is significantly higher than expected, and there may be a large number of unfilled pores. The control system determines that a significant increase in grouting volume and concentration is needed: First, multiply the initial quantity by a first factor to obtain a second quantity, ensuring sufficient grout to fill high-permeability formations; simultaneously, increase the proportion of solid materials (e.g., from 1 part solid: 2 parts liquid to 1.6 parts solid: 2 parts liquid) to increase grout viscosity and prevent grout loss due to excessive flow rate. For example, if the initial difference is 0.003 m / s in a sand layer, it indicates that the grout diffusion rate is fast but the filling is insufficient in the low-pressure stage; significantly increasing the grouting volume and solid ratio can effectively improve the filling effect in the medium-pressure stage.

[0059] When the first difference is not greater than the set first difference threshold, the second quantity is determined to be the first quantity multiplied by a preset second multiple. The proportion of solid material in the first ratio is increased by a preset second solid material proportion to determine the second ratio. Here, the preset second multiple is a small adjustment coefficient, and the preset second solid material proportion is a small percentage increase. Specifically, this step is applicable to scenarios where the first difference is small, indicating that the formation permeability is slightly higher than expected, but no significant parameter adjustment is required. The control system determines that only a small increase in grouting volume and grout concentration is needed: the first quantity is multiplied by the second multiple to obtain the second quantity, to supplement the slightly overestimated formation porosity; at the same time, the solid proportion is slightly increased (e.g., from 1:2 to 1.3:2) to prevent localized grout loss due to slightly faster flow rate. For example, in the boundary area between clay and sand layers, if the permeability coefficient is slightly higher than the threshold during the low-pressure stage, a small adjustment can adapt to formation changes and avoid excessive adjustment leading to excessively high grout viscosity.

[0060] If the second permeability coefficient is not greater than the first permeability coefficient threshold, the second quantity is determined to be the first quantity multiplied by a preset third multiple, and the proportion of solid material in the first ratio is increased by a preset third solid material proportion to determine the second ratio. The preset third multiple is an adjustment coefficient to address insufficient permeability, and the preset third solid material proportion represents a moderate increase. Specifically, this step is applicable to scenarios with insufficient permeability in the low-pressure stage, which may be due to poor formation permeability (such as clay layers) or an unreasonable grout ratio (such as an excessively high liquid phase ratio). The control system determines that both the grouting volume and grout concentration need to be increased simultaneously: the first quantity is multiplied by a third multiple (e.g., 1.3 times) to ensure more grout is available to penetrate low-permeability areas; simultaneously, the solid phase ratio is increased (e.g., from 1:2 to 1.45:2) to enhance the grout's compaction capacity and prevent ineffective diffusion in the medium-pressure stage due to excessively thin grout. For example, in clay layers, if the second permeability coefficient is below the threshold, increasing the grouting volume and solid phase ratio can help the grout squeeze the gaps between clay particles, improving the diffusion effect in the medium-pressure stage.

[0061] S305. According to the preset second pressure, inject the second amount and the second ratio of second grouting material into the grouting pipe so that the second grouting material diffuses into the surrounding strata through the first grouting port 16 and the second grouting port 15 in the grouting pipe, and monitor the permeability coefficient in real time.

[0062] The preset second pressure represents the grouting pressure value set by the grading grouting control system in the medium-pressure stage, falling between low and high pressure, and is used to propel the adjusted grout to diffuse deeper into the formation. The second grouting material is a grout mixed according to the second ratio, whose volume ratio of solid phase materials (such as cement and fly ash) and liquid phase materials (such as water and water-reducing agents) has been optimized through parameter adjustments in the previous stage. The second grouting port 15 is used to assist grout diffusion in the medium-pressure stage and automatically opens when the pressure reaches the second pressure. Medium-pressure diffusion refers to the simultaneous injection of grout through the first grouting port 16 and the second grouting port 15 under medium pressure, continuing the penetration path of the low-pressure stage while expanding the diffusion range by adding grouting ports, for example, forming two layers of grout diffusion zones in sand layers. Real-time monitoring of the permeability coefficient is similar to that in the low-pressure stage, using sensors installed in the grouting pipe or formation to continuously collect data, reflecting the diffusion efficiency of the grout in the formation during the medium-pressure stage.

[0063] Specifically, after completing the parameter adjustment in S304, the graded grouting control system enters the medium-pressure diffusion stage. This stage is suitable for scenarios where the grout coverage needs to be expanded after low-pressure infiltration. The system first sends a command to the hydraulic pump 2 to increase the grouting pressure to the preset second pressure. At the same time, it controls the grout storage tank 5 to deliver materials according to the second ratio. At this time, the proportion of solid material may be higher, the conveying speed of the screw feeder is increased accordingly, and the flow rate of liquid material is reduced through the solenoid valve to ensure that the viscosity of the mixed grout meets the requirements of medium-pressure diffusion. After the grout is delivered to the grouting pipe via the grout outlet pipe 6 and the connecting module, it not only continues to be sprayed from the first grouting port 16 (oblique cut) at the bottom, but also triggers the opening of the valve at the second grouting port 15 (if the pressure reaches 1.5 MPa, the valve of the rectangular grouting hole will automatically open), creating the effect of simultaneous grouting at two grouting points: In the sand layer, the grout from the bottom oblique cut continues to penetrate deeper, while the grout from the upper second grouting port 15 diffuses to the surrounding shallower areas, forming a "three-dimensional cross" diffusion pattern; In the clay layer, the medium-pressure grout replenishes the areas that were not fully penetrated in the low-pressure stage through the second grouting port 15. For example, when the grout at the bottom encounters a clay barrier, the grout from the upper grouting port can bypass the barrier layer and penetrate from the side. During this process, the system monitors the grout diffusion in real time through a permeability coefficient sensor: if the permeability coefficient increases in the low-pressure stage, it indicates that the medium-pressure diffusion is effective; if it remains lower than expected, further parameter adjustments are needed.

[0064] S306. If the permeability coefficient is lower than the preset second permeability coefficient threshold, or the second quantity and the second ratio of grouting material are consumed, then the permeability coefficient at the current moment is determined to be the third permeability coefficient.

[0065] The preset second permeability coefficient threshold is a critical value set by the control system during the medium-pressure stage. It is used to determine whether the medium-pressure diffusion has achieved the expected effect. If the actual permeability coefficient is lower than this threshold, it indicates that the grout diffusion during the medium-pressure stage is still insufficient, and there may be deep low-permeability areas or the mix ratio still needs to be optimized. The consumption of the second quantity of grouting material means that the total amount of grout mixed according to the second mix ratio has been fully injected into the formation. At this point, regardless of whether the permeability coefficient meets the standard, subsequent parameters need to be adjusted according to the current state. The third permeability coefficient is the instantaneous permeability coefficient value triggered when the adjustment during the medium-pressure stage is activated.

[0066] Specifically, this step continues during the medium-pressure diffusion stage, with the staged grouting control system monitoring two key conditions in real time:

[0067] 1. Permeability coefficient below the threshold: For example, during medium-pressure grouting in a sand layer, if the permeability coefficient gradually decreases from the initial 0.006 m / s to 0.007 m / s (below the threshold of 0.008 m / s), it indicates that there may be a dense sand layer deep within the formation or that the grout viscosity is too high, resulting in obstructed diffusion. At this time, the system records the current permeability coefficient of 0.007 m / s as the third permeability coefficient and triggers parameter adjustment for the high-pressure stage.

[0068] 2. Material Depletion: If, after all 12 cubic meters of the second-proportion grout has been injected, the permeability coefficient is 0.009 m / s (higher than the threshold of 0.008 m / s), it indicates that the medium-pressure stage is effective and the formation has fully absorbed the grout. The system records this value as the third permeability coefficient and prepares to enter the high-pressure compaction stage. In actual operation, these two conditions may be triggered sequentially due to differences in formation. For example, in clay layers, medium-pressure grouting may trigger the condition of a permeability coefficient below the threshold before material depletion due to the high viscosity and slow diffusion of the grout; while in sand layers, the grout may be quickly depleted due to good permeability, but the permeability coefficient may still meet the standard. In either case, the system will pause medium-pressure grouting and calculate the parameters for the high-pressure stage based on the third permeability coefficient.

[0069] S307. Based on the third permeability coefficient, adjust the second quantity and the second ratio to obtain the third quantity and the third ratio;

[0070] The third permeability coefficient represents the actual permeability of the formation at the end of the medium-pressure diffusion stage. The second quantity and the second ratio are the grouting parameters for the medium-pressure stage, which may need to be adjusted again due to insufficient medium-pressure diffusion or material depletion. The third quantity is the final total grouting volume after adjustment, and the third ratio is the solid / liquid volume ratio during the high-pressure compaction stage. The adjustment aims to increase the grout concentration or the grouting volume to fully compact the formation pores under high pressure, forming a high-strength pile end composite layer.

[0071] The more specific adjustment process is as follows: If the third permeability coefficient is greater than the second permeability coefficient threshold, then the second difference between the third permeability coefficient and the second permeability coefficient threshold is calculated. The second permeability coefficient threshold is a critical value set by the control system during the medium-pressure stage to determine whether the medium-pressure diffusion has achieved the expected effect (e.g., set to 0.008 m / s in sand layers). The second difference is the gap between the third permeability coefficient and the second permeability coefficient threshold, used to quantify the deviation of the grouting effect from the target during the medium-pressure stage. Specifically, this step is automatically triggered after the medium-pressure diffusion stage ends, and is applicable to scenarios where the actual permeability of the formation is still better than expected during the medium-pressure stage. The control system first retrieves the third permeability coefficient recorded during the medium-pressure stage and the preset second permeability coefficient threshold, and obtains the second difference through subtraction. The purpose of this calculation is to assess whether the grout diffusion during the medium-pressure stage is sufficient. For example, if the permeability coefficient is higher than the threshold during the medium-pressure stage in a pebble layer, it indicates that the deep pores are still not filled, and further parameter adjustments are needed.

[0072] When the second difference exceeds the set second difference threshold, the third quantity is determined to be the second quantity multiplied by a preset fourth multiple, and the proportion of solid material in the second ratio is increased by a preset fourth solid material proportion. The set second difference threshold is the standard used by the control system to distinguish between "significant over-diffusion" and "slight over-diffusion." The preset fourth multiple is a coefficient used to significantly increase the grouting volume, and the preset fourth solid material proportion represents a relatively high increase. Specifically, this step is applicable to scenarios with a large second difference, indicating that the grout diffusion rate in the medium-pressure stage significantly exceeds expectations, and the formation may have large areas of high permeability or fractures. The control system determines that a significant increase in grouting volume and further increase in grout concentration is needed: multiplying the second quantity by a fourth multiple (e.g., 1.4 times) to ensure sufficient grout fills deep pores, while significantly increasing the solid proportion (e.g., adjusting from 1:1.5 to 2.1:1.5) to enhance the grout's compaction capacity and prevent the grout from failing to solidify effectively due to excessive flow rate in the high-pressure stage. For example, in sand layers with underground fissures, if the second difference is 0.003 m / s, a significant adjustment of the parameters can prevent the grout from flowing along the fissures and ensure the high-pressure compaction effect.

[0073] When the second difference is not greater than the set second difference threshold, the third quantity is determined to be the second quantity multiplied by a preset fifth multiple, and the proportion of solid material in the second ratio is increased by a preset fifth solid material proportion; where the preset fifth multiple is a small increment coefficient, and the preset fifth solid material proportion is a moderate increase in proportion. Specifically, this step is applicable to scenarios where the second difference is small, indicating that the grout diffusion rate in the medium-pressure stage is slightly higher than expected, but no extreme adjustment is required. The control system determines that only a small increase in grouting volume and an appropriate increase in grout concentration are needed: multiplying the second quantity by a fifth multiple (e.g., 1.1 times) to supplement the slightly overestimated pores, while moderately increasing the solid proportion (e.g., from 1:1.5 to 1.65:1.5) to balance grout fluidity and compaction capacity. For example, in the transition zone between sand and clay layers, if the permeability coefficient in the medium-pressure stage is slightly higher than the threshold, a small adjustment can adapt to the gradual changes in formation characteristics and avoid the grout becoming too thick, causing pipe blockage.

[0074] If the third permeability coefficient is not greater than the second permeability coefficient threshold, then the third quantity is the second quantity multiplied by a preset sixth multiple, and the proportion of solid material in the second mix ratio is reduced by a preset sixth solid material proportion. Here, the preset sixth multiple is a coefficient used to reduce the grouting volume (e.g., 0.9 times), and the preset sixth solid material proportion is the reduction in the solid proportion (e.g., a 10% reduction). Specifically, this step is applicable to scenarios where the permeability is insufficient or saturated in the medium-pressure stage, possibly due to excessively high grout viscosity hindering diffusion, or the formation being fully filled. The control system determines that it is necessary to reduce the grouting volume and lower the solid proportion: multiplying the second quantity by a sixth multiple (e.g., 0.9 times) to avoid over-grouting, while simultaneously reducing the solid proportion (e.g., adjusting from 1:1.5 to 0.9:1.5) to dilute the grout and improve fluidity, ensuring that the grout in the high-pressure stage can effectively compact the remaining pores without waste. For example, in clay layers, if the permeability coefficient in the medium-pressure stage is below the threshold, it indicates that the grout is difficult to diffuse; reducing the solid proportion can reduce the grout viscosity, which, combined with high pressure, enhances the diffusion effect.

[0075] S308. According to the preset third pressure, inject the third amount and the third ratio of third grouting material into the grouting pipe so that the third grouting material is squeezed into the surrounding strata under high pressure through the first grouting port 16, the second grouting port 15 and the third grouting port 14 in the grouting pipe.

[0076] The preset third pressure represents the highest grouting pressure set by the graded grouting control system during the high-pressure compaction stage. This pressure forces high-concentration grout into the tiny pores or fissures of the stratum, further increasing soil density. The third grouting port 14 is a grouting hole on the grouting pipe located above the second grouting port 15. It typically opens automatically during the high-pressure stage, forming upper, middle, and lower three-layer grouting channels with the first and second grouting ports 15. For example, a circular grouting hole can be set 1 meter from the pile tip to ensure that the grout covers strata at different depths. High-pressure compaction refers to the application of pressure to the stratum through multiple grouting ports under high pressure, forcing soil particles to rearrange, reducing pore volume, and forming a dense "pile-grout-soil" composite.

[0077] Specifically, after the control system completes the parameter adjustment of S307, it enters the high-pressure compaction stage. The system first raises the grouting pressure to the preset third pressure, and at the same time controls the grout storage tank 5 to deliver materials according to the third ratio. At this time, the screw feeder delivers solid materials such as cement at the highest speed, the solenoid valve greatly reduces the liquid flow, and the grout is delivered to the grouting pipe through the grout outlet pipe 6 and the connecting module. Then, the valves of the three grouting ports are triggered to open in sequence: the bottom oblique cut (first grouting port 16) is responsible for compacting the deep soil at the bottom of the pile end, the middle rectangular hole (second grouting port 15) fills the middle area of ​​the pile end, and the top third grouting port 14 replenishes the shallow soil at the pile end, forming a three-dimensional compaction effect. For example, in gravel strata, high-pressure grout is injected simultaneously through three grouting ports to completely fill the gaps between the gravels. The permeability coefficient can be reduced from the initial 0.01 m / s to below 0.0005 m / s, forming a high-strength reinforcement layer. In clay layers, high-pressure grout breaks down the cohesion between clay particles and increases the soil strength through compaction. Even if the permeability coefficient does not decrease significantly, the soil density is increased, and the pile end resistance can be increased by more than 40%.

[0078] During this process, the system continuously monitors the grouting pressure and grout flow rate: if the pressure suddenly spikes, it may indicate that the formation is close to saturation, and the system will gradually reduce the grouting volume until it ends; if the flow rate remains stable, the high pressure is maintained until the third batch of grout is fully injected.

[0079] In this embodiment, the technical means of staged grouting based on different pressures and dynamic adjustment of grouting material ratio and quantity according to real-time monitoring of permeability coefficient are adopted. Therefore, the grouting process can be precisely controlled in response to the real-time changes in the heterogeneity and permeability of the stratum. This effectively solves the problems of poor grout filling effect and insufficient pile bearing capacity caused by fixed grouting parameters and inability to adapt to stratum differences in the prior art. In this way, the grout can be used to fill and compact the pores of the stratum layer by layer, thereby enhancing the bonding force between the pile end and the stratum.

[0080] The graded grouting control system in the embodiments of this invention is described below from the perspective of hardware processing. Please refer to [link / reference needed]. Figure 4 This is a schematic diagram of the physical structure of a graded grouting control system in an embodiment of this application.

[0081] It should be noted that, Figure 4 The structure of the graded grouting control system shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

[0082] like Figure 4As shown, the graded grouting control system includes a Central Processing Unit (CPU) 401, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 402 or programs loaded from storage section 408 into Random Access Memory (RAM) 403, such as performing the methods described in the above embodiments. The RAM 403 also stores various programs and data required for system operation. The CPU 401, ROM 402, and RAM 403 are interconnected via a bus 404. An Input / Output (I / O) interface 405 is also connected to the bus 404.

[0083] The following components are connected to I / O interface 405: input section 406 including audio input devices, push-button switches, etc.; output section 407 including a liquid crystal display (LCD) and audio output devices, indicator lights, etc.; storage section 408 including a hard disk, etc.; and communication section 409 including a network interface card such as a LAN (Local Area Network) card, modem, etc. Communication section 409 performs communication processing via a network such as the Internet. Drive 410 is also connected to I / O interface 405 as needed. Removable media 411, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 410 as needed so that computer programs read from them can be installed into storage section 408 as needed.

[0084] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing computer programs for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 409, and / or installed from removable medium 411. When the computer program is executed by central processing unit (CPU) 401, it performs the various functions defined in the present invention.

[0085] It should be noted that specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0086] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. Each block in a flowchart or block diagram may represent a module, program segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those shown in the drawings.

[0087] Specifically, the graded grouting control system of this embodiment includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, it implements the pile end graded grouting method provided in the above embodiment.

[0088] In another aspect, the present invention also provides a computer-readable storage medium, which may be included in the graded grouting control system described in the above embodiments; or it may exist independently and not assembled into the graded grouting control system. The storage medium carries one or more computer programs that, when executed by a processor of the graded grouting control system, cause the graded grouting control system to implement the pile-end graded grouting method provided in the above embodiments.

[0089] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0090] As used in the above embodiments, depending on the context, the term "when..." can be interpreted as meaning "if...", "after...", "in response to determining...", or "in response to detecting...". Similarly, depending on the context, the phrase "when determining..." or "if (the stated condition or event) is interpreted as meaning "if determining...", "in response to determining...", "when (the stated condition or event) is detected", or "in response to detecting (the stated condition or event)".

[0091] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM or random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A method for staged grouting at the pile tip, characterized in that, The method includes: Obtain the first proportion and first quantity of grouting material, wherein the proportion is the volume ratio of solid phase material to liquid phase material; According to the preset first pressure, the first quantity and first ratio of first grouting material are injected into the grouting pipe so that the first grouting material can permeate into the surrounding strata at low pressure through the first grouting port (16) in the grouting pipe, and the permeability coefficient is monitored in real time. If the permeability coefficient is lower than a preset first permeability coefficient threshold, or if the first quantity of grouting material in the first ratio is consumed, then the permeability coefficient at the current moment is determined to be the second permeability coefficient. Based on the second permeability coefficient, the first quantity and the first ratio are adjusted to obtain a second quantity and a second ratio; According to the preset second pressure, the second amount and the second ratio of the second grouting material are injected into the grouting pipe so that the second grouting material diffuses into the surrounding strata through the first grouting port (16) and the second grouting port (15) in the grouting pipe, and the permeability coefficient is monitored in real time. If the permeability coefficient is lower than the preset second permeability coefficient threshold, or the second quantity and second ratio of grouting material are consumed, then the permeability coefficient at the current moment is determined to be the third permeability coefficient; Based on the third permeability coefficient, the second quantity and the second ratio are adjusted to obtain the third quantity and the third ratio; According to the preset third pressure, the third amount of the third grouting material in the third ratio is injected into the grouting pipe so that the third grouting material is squeezed into the surrounding strata under high pressure through the first grouting port (16), the second grouting port (15) and the third grouting port (14) in the grouting pipe; The step of adjusting the first quantity and the first ratio in conjunction with the second permeability coefficient to obtain a second quantity and a second ratio includes: If the second permeability coefficient is greater than the first permeability coefficient threshold, then calculate the first difference between the second permeability coefficient and the first permeability coefficient threshold; When the first difference is greater than the set first difference threshold, the second quantity is determined to be the first quantity multiplied by a preset first multiple, and the proportion of solid material in the first ratio is increased by a preset first solid material proportion to determine the second ratio; When the first difference is not greater than the set first difference threshold, the second quantity is determined to be the first quantity multiplied by a preset second multiple, and the proportion of solid material in the first ratio is increased by a preset second solid material proportion to determine the second ratio; If the second permeability coefficient is not greater than the first permeability coefficient threshold, then the second quantity is determined to be the first quantity multiplied by a preset third multiple, and the proportion of solid material in the first ratio is increased by a preset third solid material proportion to determine the second ratio; The step of adjusting the second quantity and the second ratio in conjunction with the third permeability coefficient to obtain the third quantity and the third ratio includes: If the third permeability coefficient is greater than the second permeability coefficient threshold, then calculate the second difference between the third permeability coefficient and the second permeability coefficient threshold; When the second difference is greater than the set second difference threshold, the third quantity is determined to be the second quantity multiplied by a preset fourth multiple, and the proportion of solid material in the second ratio is increased to a preset fourth solid material proportion; When the second difference is not greater than the set second difference threshold, the third quantity is determined to be the second quantity multiplied by a preset fifth multiple, and the proportion of solid material in the second ratio is increased to a preset fifth solid material proportion; If the third permeability coefficient is not greater than the second permeability coefficient threshold, then the third quantity is the second quantity multiplied by a preset sixth multiple, and the proportion of solid material in the second ratio is reduced by a preset sixth solid material proportion.

2. The method according to claim 1, characterized in that, The process of obtaining the first proportion and first quantity of grouting material includes: Obtain the first permeability coefficient and first soil layer composition data of the construction area; The first permeability coefficient and the first soil composition data are input into the pile end grouting coefficient determination model to obtain the first proportion and the first quantity of the grouting material. The pile end grouting coefficient determination model is constructed in advance by deep learning based on multiple permeability coefficient sets and soil composition datasets with proportion and quantity labels.

3. The method according to claim 1, characterized in that, The first grouting port (16) is located at the bottom of the grouting pipe and has a bevel with a set bevel angle, which is the angle between the plane where the bevel is located and the horizontal plane.

4. The method according to claim 1, characterized in that, The second grouting port (15) is located above the first grouting port (16). When the grouting pressure is greater than the first valve pressure threshold of the second grouting port (15), the first valve will be opened automatically.

5. The method according to claim 1, characterized in that, The third grouting port (14) is located above the second grouting port (15). When the grouting pressure is greater than the second valve pressure threshold of the third grouting port (14), the second valve will be opened automatically.

6. A graded grouting control system, characterized in that, The graded grouting control system includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code including computer instructions, and the one or more processors call the computer instructions to cause the graded grouting control system to perform the method as described in any one of claims 1-5.

Images