Grouting test device for simulating indoor filled roadbed and test method thereof

Abstract

The invention provides a grouting test device for simulating an indoor filled roadbed and a test method thereof, and relates to the technical field of grouting tests.The grouting test device comprises a test grouting structure, a soil displacement monitoring structure and a grout manufacturing and conveying structure, and the test grouting structure is used for conducting a grouting test; the soil displacement monitoring structure is used for monitoring and acquiring grouting test data, and the grouting test data comprises roadbed soil layer displacement change data, grouting pressure data and slurry flow data in the grouting process; the grout manufacturing and conveying structure is used for manufacturing grout and conveying the grout to the test grouting structure. By monitoring the displacement of the soil body in real time and dynamically adjusting the grouting parameters, the uniformity and the control precision of the grouting effect are remarkably improved, the grouting pressure and the grouting flow can be accurately adjusted in the grouting process, and accurate reinforcement of different roadbed soil bodies is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grouting test, in particular to a grouting test device for simulating indoor filling roadbed and a test method thereof. BACKGROUND

[0002] Roadbed settlement is one of the common diseases in railway engineering, which can cause railway track unevenness, line geometric position change and peripheral facility damage, and seriously affect the safety and normal operation of the railway along the line. Here, grouting is a relatively stable roadbed reinforcement method, which can significantly reduce the roadbed settlement by injecting cement slurry into the soil to fill the voids inside the soil. However, there are still some limitations in current grouting technology, such as the dependence on the experience of engineers, the difficulty in controlling the slurry ratio and grouting pressure for different road sections, and the difficulty in grasping the slurry injection direction and distribution in the soil.

[0003] Therefore, there is an urgent need for a grouting test device for simulating indoor filling roadbed and a test method thereof to simulate roadbed grouting and overcome the limitations of current grouting technology. SUMMARY

[0004] The present application aims to provide a grouting test device for simulating indoor filling roadbed and a test method thereof to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present application is as follows:

[0005] In a first aspect, the present application provides a grouting test device for simulating indoor filling roadbed, comprising:

[0006] a test grouting structure for performing grouting test;

[0007] a soil displacement monitoring structure for monitoring and obtaining grouting test data, the grouting test data including roadbed soil layer displacement change data, grouting pressure data and slurry flow data during grouting process;

[0008] a slurry manufacturing and conveying structure for manufacturing and conveying slurry to the test grouting structure.

[0009] In a second aspect, the present application further provides a grouting test method for simulating indoor filling roadbed, comprising:

[0010] cleaning the test grouting structure, and installing the test grouting structure, the soil displacement monitoring structure and the slurry manufacturing and conveying structure based on a preset installation method;

[0011] controlling the slurry manufacturing and conveying structure to perform grouting based on a preset grouting method;

[0012] Based on the soil displacement monitoring structure, the displacement change data of the subgrade soil layer, the grouting pressure data and the slurry flow data in the grouting process are obtained;

[0013] Based on the displacement change data of the subgrade soil layer, the grouting pressure data and the slurry flow data, the grouting pressure adjustment data and the grouting flow adjustment data are calculated, and the slurry manufacturing and conveying structure is controlled to grout according to the grouting pressure adjustment data and the grouting flow adjustment data, so as to obtain the test results, which are the soil layer displacement data and the subgrade soil layer structure strength data obtained by sampling and analyzing the subgrade after grouting.

[0014] The beneficial effects of the present application are:

[0015] The present application significantly improves the uniformity and control accuracy of grouting effect by real-time monitoring of soil displacement and dynamic adjustment of grouting parameters, and can accurately adjust the grouting pressure and flow during the grouting process to ensure accurate reinforcement of different soil bodies. In addition, high-strength and corrosion-resistant materials are used to manufacture key parts of the device, effectively improving the safety and long-term reliability of the test. This improvement not only enhances the stability of grouting, but also effectively reduces manual operation and optimizes experimental conditions, providing a more efficient and accurate solution for indoor filling subgrade simulation.

[0016] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood by those skilled in the art from the description, or will be understood by those skilled in the art from the description. The purpose and other advantages of the present application can be achieved and obtained by the structure specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 A structure schematic diagram of a grouting test device for simulating indoor filling subgrade according to an embodiment of the present application;

[0019] Figure 2 A three-dimensional structure schematic diagram of a grouting box in a grouting test device for simulating indoor filling subgrade according to an embodiment of the present application;

[0020] Figure 3 A flowchart of a grouting test method for simulating indoor filling subgrade according to an embodiment of the present application.

[0021] Reference signs in the drawings:

[0022] 1, central control console; 2, high-speed camera; 3, grouting box; 4, control terminal; 5, grouting machine; 6, grout storage barrel; 7, layered grouting pipe; 8, simulated soil medium; 9, glass surface; 10, reinforcing rib; 11, fixed grouting pipe gap; 12, high-pressure grout delivery pipe; 13, grouting pressure controller. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative work based on the embodiments in the present application belong to the scope of protection of the present application.

[0024] It should be noted that: similar reference signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Meanwhile, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] Embodiment 1:

[0026] Referring to Figure 1 and Figure 2 , the embodiment provides a grouting test device for simulating indoor filling roadbed, which is characterized by comprising:

[0027] a test grouting structure, which is used for performing grouting test;

[0028] a soil displacement monitoring structure, which is used for monitoring and acquiring grouting test data, wherein the grouting test data comprises roadbed soil layer displacement change data, grouting pressure data and grout flow data in the grouting process;

[0029] a grout manufacturing and delivery structure, which is used for manufacturing and delivering grout to the test grouting structure.

[0030] It is understood that in this step, the test grouting structure serves as the key part of the entire system, mainly responsible for simulating the reinforcement process of the indoor roadbed. Through components such as the grouting box and the layered grouting pipe, the structure injects slurry into the simulated soil medium, simulating the reinforcement process of the roadbed soil layer in actual engineering. In order to ensure the uniformity and accuracy of grouting, the design of the test grouting structure often requires precise control of the injection pressure and flow of the slurry, and precise positioning of the grouting position is also required. Through the design of the layered grouting pipe, it can achieve segmented grouting at different depths and positions inside the soil body. This multi-point grouting method can effectively avoid the uneven soil reinforcement that may occur in traditional grouting techniques, improving the reliability of the test.

[0031] The soil displacement monitoring structure uses a high-speed camera and a control terminal to monitor and obtain the changes of the roadbed soil layer during grouting in real time. The high-speed camera plays a crucial role in this step, as it captures the tiny displacement of the roadbed surface and side soil particles, providing high-precision data on soil changes. These data include the vertical settlement and horizontal displacement of the soil layer, which can directly reflect the reinforcement effect of the soil body. After obtaining the displacement data, the control system processes it using algorithms to analyze the displacement pattern of the soil layer and adjusts the grouting parameters, such as grouting pressure and flow, through a feedback mechanism. This process ensures real-time dynamic control of the grouting effect, avoiding manual errors in traditional methods and improving the accuracy of test results.

[0032] The slurry manufacturing and delivery structure is responsible for the manufacturing and delivery of the slurry. This structure usually includes a grouting machine, a slurry storage barrel, and high-pressure delivery pipelines, ensuring that the slurry is manufactured according to the predetermined ratio and accurately delivered to the test grouting structure through the control system. In this link, the precise control of the flow and pressure of the slurry is crucial, as it ensures that the slurry is stably and uniformly distributed in the simulated soil, thereby achieving the reinforcement of the roadbed. Through the design of the high-pressure slurry delivery pipe, the slurry can be quickly delivered to the target area under certain pressure, effectively avoiding the possibility of flow fluctuations or uneven distribution of the slurry during delivery.

[0033] The test grouting structure includes a grouting box 3, a layered grouting pipe 7, a reinforced rib 10, a glass surface 9, a simulated soil medium 8, and a fixed grouting pipe gap 11. The side wall of the grouting box 3 is provided with a reinforced rib 10, all surfaces of the grouting box 3 are provided with a glass surface 9, the upper top surface of the grouting box 3 is provided with a fixed grouting pipe gap 11, the grouting box 3 is provided with a simulated soil medium 8, and the layered grouting pipe 7 is inserted into the simulated soil medium 8 through the fixed grouting pipe gap 11.

[0034] It can be understood that the design and construction of the test grouting structure in the application have high precision, aiming to accurately simulate and control the grouting process, so as to effectively analyze the reinforcement effect of grouting on the subgrade soil layer. The grouting box 3 as the core component of the whole structure provides a transparent observation window to monitor the soil changes during the grouting test process. The glass surface 9 is arranged around the grouting box 3, which can clearly observe the dynamic changes of the soil during the grouting process, ensure that the experimental personnel can see the movement of the soil particles in real time, and has strong pressure resistance, which adapts to the pressure that may be generated in the high-pressure grouting process. In order to further improve the stability of the box body, the reinforcing rib 10 is designed on the side wall of the grouting box 3, which effectively prevents the deformation or inclination of the box body caused by the grouting pressure. Such a structure design improves the reliability and accuracy of the experiment.

[0035] The layered grouting pipe 7 in the application is used for grouting the simulated soil medium 8 with uneven settlement, and four grouting holes with a diameter of 16 mm are arranged around the pipe body.

[0036] The top of the grouting box is equipped with a fixed grouting pipe gap 11, which ensures the stability and accurate positioning of the layered grouting pipe 7. During the grouting process, the grouting pipe will pass through the gap and be inserted into the simulated soil medium 8, ensuring that the slurry is uniformly and accurately injected into different levels of soil. This design can avoid the problem of loosening or deviation of the grouting pipe in traditional grouting, ensuring that the slurry is uniformly dispersed in different depths of soil, and improving the effectiveness of grouting.

[0037] The setting of the simulated soil medium 8 is also extremely critical, which acts as a simulated actual soil, ensuring that the results of the grouting test have high practical reference value. The physical properties (such as particle size, porosity, and density) of the simulated soil are similar to those of the actual soil, thereby providing a more realistic experimental environment, helping researchers more accurately analyze the response of the soil during the grouting process, and further optimizing the grouting process.

[0038] Among them, the soil displacement monitoring structure includes a high-speed camera 2, a control terminal 4, a central control console 1 and a grouting pressure controller 13, the high-speed camera 2 is provided with five groups, each group of high-speed camera 2 is arranged on the side and upper part of the test grouting structure, the high-speed camera 2 and the control terminal 4 are electrically connected, the control terminal 4 is electrically connected with the central control console 1 and the grouting pressure controller 13 respectively.

[0039] It can be understood that the design of the soil displacement monitoring structure in the present application fully considers the needs of real-time monitoring and precise control of soil changes. The high-speed cameras 2, as the core components, are configured in five groups, respectively set at the side and upper part of the test grouting structure, with the purpose of monitoring the displacement changes of the subgrade soil layer in the grouting process from all directions and multiple angles. These high-speed cameras can capture the tiny displacement of soil particles, provide continuous dynamic image data through high-frequency video shooting. These data can show the particle movement of the soil surface and side in detail, thus reflecting the soil reinforcement effect and its unevenness in the grouting process in real time, providing a basis for further analysis and adjustment.

[0040] These high-speed cameras are electrically connected with the control terminal 4 for data transmission and processing. The control terminal functions to analyze the video data captured by the high-speed cameras, and calculates the displacement and change trend of soil particles in real time. The control terminal also acts as the "brain" of the entire monitoring system, and transmits the analysis results to other control modules, including the central control console 1 and the grouting pressure controller 13. The central control console can globally monitor and manage the grouting process according to the soil displacement through real-time data reception and analysis, while the grouting pressure controller adjusts the pressure and flow of the grouting system according to the feedback provided by the control terminal. This closed-loop control system automatically optimizes the grouting process through data feedback, ensuring that the grouting parameters always match the actual needs of the soil, avoiding the shortcomings of relying on manual operation in traditional grouting methods.

[0041] The slurry manufacturing and delivery structure includes a grouting machine 5, a slurry storage barrel 6, and a high-pressure slurry delivery pipe 12. The grouting machine 5 is electrically connected with the grouting pressure controller 13, and is connected with the slurry storage barrel 6. The slurry storage barrel 6 is connected with the test grouting structure through the high-pressure slurry delivery pipe 12.

[0042] It can be understood that the design of the slurry manufacturing and delivery structure in the present application aims to ensure efficient manufacturing and stable delivery of slurry, providing necessary slurry support for the entire grouting test. The structure mainly consists of a grouting machine 5, a slurry storage barrel 6, and a high-pressure slurry delivery pipe 12, which work together to ensure that the slurry can be accurately delivered to the test grouting structure according to the predetermined parameters.

[0043] First, the function of the grouting machine 5 is to mix cement and other materials with water to prepare a grout with a specific ratio. This grouting machine typically uses mechanical devices such as screw pumps, employing physical stirring and pressure control to ensure that the grout does not settle or become uneven during flow. The grouting machine is electrically connected to the grouting pressure controller 13, ensuring real-time monitoring and adjustment of the grouting pressure during the grouting process, preventing grout flow fluctuations or excessive diffusion caused by uneven pressure. This control mechanism ensures the stability and quality of the grouting process by precisely controlling the injection of grout, preventing excessively high or low pressure from affecting the grouting effect.

[0044] The slurry storage tank 6 serves as a slurry storage device, responsible for storing the slurry and ensuring a stable supply. The design capacity of the storage tank can be adjusted according to experimental needs, generally holding a sufficient amount of slurry to prevent insufficient slurry during the grouting process. The storage tank is connected to the grouting machine via pipelines, ensuring the machine can continuously draw slurry from the tank and deliver it to the test grouting structure through the high-pressure slurry delivery pipe 12. In practical applications, the high-pressure slurry delivery pipe 12 is responsible for delivering the slurry to different soil depths under a certain pressure. These pipes are designed to withstand high grouting pressures and maintain the stability and uniformity of the slurry during delivery.

[0045] Example 2

[0046] See Figure 3 The figure shows that the method includes steps S1, S2, S3 and S4.

[0047] Step S1: Clean the test grouting structure, and install the test grouting structure, soil displacement monitoring structure and grout production and delivery structure according to the preset installation method;

[0048] Understandably, this step begins with cleaning the test grouting structure. This step is crucial to ensure the accuracy and repeatability of the grouting test. The grouting test structure, especially components such as the grouting box and layered grouting pipes, may have been affected by dirt, deposits, or other contaminants during previous use. These substances can affect grout flow, grouting pressure stability, and the monitoring of soil displacement. Therefore, cleaning the test grouting structure is essential. It ensures the cleanliness of the equipment, guaranteeing not only the accuracy of the experimental results but also preventing contaminants from interfering with the experimental process, thus avoiding equipment damage or data errors.

[0049] Next, the test grouting structure, soil displacement monitoring structure, and grout production and delivery structure are installed according to the preset installation method. The key to this installation step is to accurately arrange each component according to the preset plan to ensure they function properly in subsequent experiments. The test grouting structure needs to be precisely installed according to the specific soil simulation requirements and grouting plan, ensuring that each part, especially the layered grouting pipes and grouting boxes, is accurately aligned to prevent uneven grouting or system instability due to device deviations. In this step, step S1 includes steps S11 and S12.

[0050] Step S11: Clean the inside of the grouting box and the layered grouting pipes to ensure that the light transmittance of the glass around the box and the fluid inside the pipes meet the preset conditions.

[0051] Understandably, cleaning the grouting tank in this step is to ensure that the space inside the tank can completely simulate the actual grouting process of a roadbed. The grouting tank is designed with glass surfaces on all sides to ensure that changes in the soil during the grouting process can be observed through the glass. Because glass has good light transmittance, any stains or contaminants will affect visual observation and data recording during the experiment. Therefore, the cleaning process is designed to ensure that dirt, oil stains, etc., will not affect the observation results. Cleaning methods typically include wiping and rinsing with detergent or water to remove any substances that may affect the accuracy of the experiment and to ensure the transparency of the glass surface.

[0052] Secondly, cleaning the inside of the layered grouting pipe is crucial to ensure the grouting fluid can flow smoothly through the pipe without obstruction or contamination. The layered grouting pipe is a key component used to uniformly inject grout into the soil; its interior must be kept clean to prevent residual grout or impurities from previous tests from affecting subsequent experiments. This cleaning process not only requires thoroughly removing all impurities from the pipe but also ensuring that any fluid within the pipe meets preset conditions, such as grout concentration and flowability. Blockages or poor flow within the pipe can lead to uneven injection or fluctuations in grouting pressure, thus affecting the accuracy of experimental data.

[0053] Step S12: Arrange high-speed cameras on the upper and side parts of the test grouting structure and initialize the high-speed cameras. At the same time, start the grout manufacturing and conveying structure, grouting machine device and central control console.

[0054] Understandably, this step ensures a stable grout supply by activating the grout manufacturing and delivery structure, providing reliable support for the grouting process. By deploying high-speed cameras and initializing the equipment, real-time monitoring of soil dynamics throughout the test is ensured, acquiring accurate displacement data to provide a basis for subsequent adjustments to grouting pressure and flow rate. Furthermore, the initialization and coordination of the equipment guarantees the synchronous operation of all testing devices, ensuring the smooth progress of the experiment and the accuracy of the data. These operations significantly improve the automation level of the grouting test, reduce human intervention, and enhance the reliability and scientific rigor of the experimental results.

[0055] Step S2: Grouting is performed by controlling the grout manufacturing and conveying structure based on a preset grouting method;

[0056] It is understandable that this step, through precise control based on a preset scheme, ensures that every step of grout manufacturing and delivery is executed according to precise parameters. This control method avoids problems such as pressure fluctuations and uneven grout distribution that may occur in traditional grouting methods. By precisely adjusting the grouting pressure and flow rate, the system can better adapt to the reinforcement needs of different types of soil layers, thereby achieving a more uniform and stable soil reinforcement effect. In addition, automated control reduces the possibility of human intervention, improving the accuracy and repeatability of the experiment. In this step, step S2 includes steps S21, S22, and S23.

[0057] Step S21: Prepare the grout required for grouting based on the preset grouting ratio, and fill the roadbed model inside the grouting box;

[0058] It is understandable that the grouting method preset in this step is designed based on the specific properties of the soil, the experimental purpose, and the actual conditions of the simulated roadbed. This includes setting key parameters such as grout mix ratio, grouting pressure, grouting flow rate, and grouting depth. For example, based on the particle size and porosity of the soil, different types of grout mix ratios may be selected to obtain the optimal reinforcement effect during the grouting process. The grouting pressure and flow rate also need to be preset according to the bearing capacity of the soil layer and the required reinforcement depth to achieve precise control during the experiment.

[0059] Step S22: Determine the grouting pressure data and grout flow rate data according to the preset grouting parameters, and fix the grouting pipe. The preset grouting parameters include preset soil lifting parameters and grouting depth parameters.

[0060] The formula for determining the grouting pressure data is as follows:

[0061] P=β·γ·H+α·S

[0062] Where P is the grouting pressure, α and β are empirical coefficients, γ·H is the soil self-weight pressure, and S is the soil uplift parameter.

[0063] The formula for determining the slurry flow rate is as follows:

[0064]

[0065] Where Q represents the grout flow rate, θ represents the soil permeability parameter, h represents the grouting depth parameter, P represents the grouting pressure, μ represents the grout viscosity, R represents the grout diffusion radius, and r0 represents the grouting hole radius.

[0066] It is understandable that grouting pressure and flow rate data are determined based on preset grouting parameters. These grouting parameters are set according to the soil type, grouting objectives, and experimental requirements. Grouting parameters include soil lift parameters and grouting depth parameters. The soil lift parameter indicates the expected amount of soil lift during grouting (e.g., vertical settlement). The soil lift parameter helps determine the pressure and flow rate to be applied during grouting, ensuring that the grout can uniformly and effectively fill the voids in the soil. Excessive lift may lead to excessive soil expansion or uneven settlement; therefore, setting this parameter appropriately is crucial for grouting effectiveness.

[0067] The grouting depth parameter indicates the depth to which the grouting fluid will be injected into the soil layer. The setting of the grouting depth affects the grouting pressure and the diffusion range of the grout. Deeper soil layers typically require higher grouting pressures to ensure effective penetration of the grout into the target area; therefore, this parameter helps determine the specific values ​​for grouting pressure and flow rate.

[0068] Based on these preset parameters, this invention automatically calculates the required grouting pressure and grout flow rate. The grouting pressure controls the force of grout injection, while the flow rate determines the injection speed and uniformity. These two values ​​need precise control to avoid uneven grouting results due to excessively high or low pressure, or excessively high or low grout flow rates affecting soil reinforcement.

[0069] Step S23: Pour the grout required for grouting into the grout manufacturing and conveying structure, and control the grout manufacturing and conveying structure to perform grouting according to the grouting pressure data and grout flow data.

[0070] Understandably, this step ensures the stability and effectiveness of the grouting process through precise pressure and flow control. By accurately adjusting the working state of the grouting machine based on grouting pressure and flow data, the system can guarantee that the grout is injected uniformly and stably into the simulated soil, thereby achieving the desired soil reinforcement effect. This automated and precise control method avoids potential human errors in traditional grouting methods, improving the uniformity, stability, and overall reinforcement accuracy of the grouting.

[0071] Step S3: Obtain data on the displacement change of the subgrade soil layer, grouting pressure, and grout flow rate during the grouting process based on the soil displacement monitoring structure;

[0072] It is understandable that this step, by acquiring and monitoring soil layer change data, grouting pressure data, and grout flow rate data in real time, provides comprehensive monitoring and analysis of the entire grouting process. This not only ensures real-time feedback of various parameters during grouting but also provides data support for subsequent adjustments. Through precise data monitoring and analysis, the system can automatically adjust grouting pressure and flow rate, optimize grouting effects, avoid potential operational errors and inaccuracies in traditional methods, and improve the accuracy and reliability of the experiment. Furthermore, this multi-dimensional data acquisition system allows every change during the grouting process to be accurately captured, thereby enhancing the controllability and traceability of the soil reinforcement process. In this step, step S3 includes step S31.

[0073] Step S31: At the start of grouting, synchronously acquire the subgrade soil layer displacement change data during the grouting process based on the soil displacement monitoring structure, and upload the grouting pressure data and grout flow rate data to the control terminal of the soil displacement monitoring structure. The subgrade soil layer displacement change data is the soil layer image data of the subgrade surface and side taken by a high-speed camera.

[0074] Understandably, this step achieves dynamic adjustment and real-time optimization during the grouting process by acquiring and uploading data in real time. The synchronous uploading of soil layer change data captured by high-speed cameras along with grouting pressure and flow rate data ensures the system's immediate response to soil changes. Through this closed-loop control, the system can dynamically adjust grouting parameters based on real-time soil changes, making the grouting process more precise and uniform, avoiding the problems of over-grouting or under-grouting that may occur in traditional grouting methods. Ultimately, this not only improves the uniformity and stability of the grouting effect but also provides accurate experimental data for subsequent soil reinforcement and stability assessment.

[0075] Step S4: Based on the displacement change data of the subgrade soil layer, the grouting pressure data, and the grout flow rate data, calculate the grouting pressure adjustment data and the grout flow rate adjustment data, and control the grout manufacturing and conveying structure to perform grouting according to the grouting pressure adjustment data and the grout flow rate adjustment data to obtain the test results. The test results are the soil layer displacement data and subgrade soil layer structural strength data obtained by the test personnel based on the sampling analysis of the subgrade after grouting.

[0076] Understandably, this step achieves precise control during the grouting process through an automated feedback adjustment system. Based on real-time soil layer change data, grouting pressure, and flow rate data, the system can intelligently adjust to ensure that the grouting effect in each area reaches its optimal state. This dynamic adjustment method not only improves the uniformity and control accuracy of grouting but also reduces human intervention, optimizing experimental efficiency and the reliability of results. Furthermore, through the final soil displacement and strength analysis, researchers can obtain scientific and accurate evaluation results, providing data support and theoretical basis for the subsequent application of grouting technology. In this step, step S4 includes steps S41 and S42.

[0077] Step S41: Calculate the displacement of soil particles based on the displacement change data of the subgrade soil layer to obtain the displacement data of soil particles;

[0078] Understandably, this step, through precise particle displacement calculation, can reflect in detail the changes in the soil during the grouting process, especially the minute displacements of soil particles. This process quantifies the dynamic behavior of the soil during grouting, providing data support for subsequent adjustments to grouting pressure and flow rate. Through comprehensive monitoring of soil particle displacement, the system can identify which areas of the soil require further reinforcement and which areas have been effectively reinforced, thereby achieving more precise grouting control and improving the uniformity of the grouting effect and the stability of the soil. In this step, step S41 includes steps S411, S412, S413, and S414.

[0079] Step S411: Preprocess the displacement change data of the subgrade soil layer, wherein the displacement vector of particles in the same area is calculated by setting up a displacement calculation function to obtain the displacement vector of all areas of the subgrade soil layer.

[0080] Considering the excessive computational cost of the overall image processing, the image is subdivided into small windows for calculation, with each window size set to Δx × Δy. Displacement (I0) is calculated by examining the same regions in two images at adjacent time points. k (x,y) and I k+1 Let (x, y) be the displacement calculation function, and let R(Δx, Δy) be the displacement vector calculation formula.

[0081]

[0082] Where R(Δx,Δy) is the displacement calculation function, and Δx,Δy represent the possible displacements of particles within the selected region, I k (x,y) is the displacement vector of particles in the image region at time point k, I k+1(x+Δx,y+Δy) represents the displacement vectors of particles in the image region at time k+1, both those that have occurred and those that may occur.

[0083] Step S412: Based on the displacement vectors of all regions of the subgrade soil layer, determine the maximum value of the regional displacement function, where the maximum value of the regional displacement function is the maximum vector value of particle displacement in the same region;

[0084] After obtaining the regional displacement, the maximum value of the regional displacement function is determined, and the maximum vector value of the particle displacement (Δx) is determined. max ,Δy max The formula for determining the maximum value of the regional displacement function is as follows:

[0085]

[0086] Among them, (Δx) max ,Δy max () represents the maximum value of the particle displacement vector. This is the displacement value corresponding to the maximum value of the displacement calculation function.

[0087] Step S413: Calculate the maximum vector value of particle displacement in each region to obtain the soil displacement field within the entire test grouting structure;

[0088] It is understandable that after obtaining the displacement within a region in this step, the above calculation is repeated to obtain the particle displacement in all regions of the image, and the displacement value corresponding to the maximum value of the displacement calculation function in all regions is determined, thereby determining the maximum vector value of particle displacement in each region.

[0089] Step S414: Convert the soil displacement field within the entire test grouting structure into an image to obtain a soil displacement distribution map.

[0090] It is understandable that by interpolating the data into the image, a continuous and smooth displacement distribution map is obtained, thus yielding the displacement field of the entire model box soil. The formula for representing the displacement field of the model box soil is as follows:

[0091] u(x,y)=(Δx max ,Δy max )

[0092] Where u(x, y) represents the displacement field of the soil in the model box, (Δx max ,Δy max ) represents the maximum value of the particle displacement vector.

[0093] Step S42: Calculate grouting pressure adjustment data and grouting flow rate adjustment data based on the displacement data of soil particles. The calculation is performed according to the preset grouting pressure adjustment formula and grouting flow rate adjustment formula to obtain the grouting pressure adjustment data and grouting flow rate adjustment data.

[0094] The preset grouting pressure adjustment formula is as follows:

[0095] P(t+1)=P(t+k p ·Δu z

[0096] Where P(t+1) is the preset grouting pressure for the next time step; P(t) is the grouting pressure for the current time step; Δu z k represents the change in vertical displacement. p This is the pressure adjustment coefficient.

[0097] The preset grouting flow rate adjustment formula is as follows:

[0098] Q(t+1)=Q(t)+k q ·Δu xy

[0099] Where Q(t+1) is the slurry flow rate at the next moment; Q(t) is the slurry flow rate at the current moment; Δu xy k represents the change in horizontal displacement. p This is the flow rate adjustment coefficient, which is adjusted according to different roadbeds.

[0100] Understandably, this step, through precise calculations and automated adjustments, enables the grouting process to be optimized entirely based on the actual response of the soil. By combining particle displacement data and preset adjustment formulas, the system can determine the soil reinforcement requirements in real time and precisely adjust the grouting pressure and flow rate, thereby achieving high efficiency and uniformity in grouting. Compared to traditional manual control or fixed grouting parameters, automated adjustment not only improves experimental accuracy and reduces human error but also greatly enhances the adaptability of the grouting process, enabling it to cope with different soil types and actual conditions. This intelligent control provides a reliable technical foundation for future, more complex engineering tests.

[0101] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A grouting test device for simulating indoor roadbed filling, characterized in that, include: A test grouting structure, which is used for grouting tests; A soil displacement monitoring structure is used to monitor and acquire grouting test data, which includes data on the displacement change of the subgrade soil layer, grouting pressure data, and grout flow rate data during the grouting process. A slurry manufacturing and conveying structure is used for manufacturing and conveying slurry to a test grouting structure.

2. The grouting test device for simulating indoor roadbed filling according to claim 1, characterized in that... ,include: The experimental grouting structure includes a grouting box (3), layered grouting pipes (7), reinforcing ribs (10), glass surfaces (9), simulated soil medium (8), and fixed grouting pipe gaps (11). Reinforcing ribs (10) are provided on the side walls of the grouting box (3). All surfaces of the grouting box (3) are glass surfaces (9). Fixed grouting pipe gaps (11) are provided on the top surface of the grouting box (3). Simulated soil medium (8) is provided inside the grouting box (3). The layered grouting pipes (7) pass through the fixed grouting pipe gaps (11) and are inserted into the simulated soil medium (8).

3. The grouting test device for simulating indoor roadbed filling according to claim 1, characterized in that... ,include: The soil displacement monitoring structure includes a high-speed camera (2), a control terminal (4), a central control console (1), and a grouting pressure controller (13). The high-speed camera (2) is provided in five groups, with each group of high-speed cameras (2) respectively located on the side and top of the test grouting structure. The high-speed camera (2) and the control terminal (4) are electrically connected, and the control terminal (4) is electrically connected to the central control console (1) and the grouting pressure controller (13).

4. The grouting test device for simulating indoor roadbed filling according to claim 3, characterized in that... The grout manufacturing and conveying structure includes a grouting machine (5), a grout storage tank (6), and a high-pressure grout conveying pipe (12). The grouting machine (5) and the grouting pressure controller (13) are electrically connected. The grouting machine (5) is connected to the grout storage tank (6). The grout storage tank (6) is connected to the test grouting structure through the high-pressure grout conveying pipe (12).

5. A grouting test method for simulating indoor embankment roadbeds, characterized in that, include: Clean the test grouting structure, and install the test grouting structure, soil displacement monitoring structure, and grout production and delivery structure according to the preset installation method; Grouting is performed by controlling the grout manufacturing and delivery structure based on a preset grouting method; Data on the displacement change of the subgrade soil layer, grouting pressure, and grout flow rate during the grouting process were obtained based on the soil displacement monitoring structure. Based on the displacement change data, grouting pressure data, and grout flow rate data of the subgrade soil layer, grouting pressure adjustment data and grout flow rate adjustment data are calculated, and the grout manufacturing and conveying structure is controlled to perform grouting according to the grouting pressure adjustment data and grout flow rate adjustment data to obtain test results. The test results are soil layer displacement data and subgrade soil layer structural strength data obtained by the test personnel based on the sampling analysis of the subgrade after grouting.

6. The grouting test method for simulating indoor embankment roadbed according to claim 5, characterized in that, The cleaning test grouting structure, and the installation of the test grouting structure, soil displacement monitoring structure, and grout production and delivery structure based on a preset installation method, includes: Clean the inside of the grouting box and the layered grouting pipes to ensure that the light transmittance of the glass around the box and the fluid inside the pipes meet the preset conditions. High-speed cameras were installed on the upper and side of the test grouting structure and initialized. At the same time, the grout manufacturing and conveying structure, grouting machine and central control console were started.

7. The grouting test method for simulating indoor embankment roadbed according to claim 5, characterized in that, Grouting is performed by controlling the grout manufacturing and delivery structure based on a preset grouting method, including: Prepare the grout required for grouting according to the preset grouting ratio, and fill the roadbed model in the grouting box; The grouting pressure and grout flow rate are determined according to the preset grouting parameters, and the grouting pipe is fixed. The preset grouting parameters include preset soil lifting parameters and grouting depth parameters. The grout required for grouting is poured into the grout manufacturing and conveying structure, and the grout manufacturing and conveying structure is controlled to perform grouting according to the grouting pressure data and grout flow data.

8. The grouting test method for simulating indoor embankment roadbed according to claim 7, characterized in that, Data on subgrade soil displacement changes, grouting pressure, and grout flow rate during the grouting process were obtained using a soil displacement monitoring structure, including: At the start of grouting, the displacement change data of the subgrade soil layer during the grouting process is acquired synchronously based on the soil displacement monitoring structure, and the grouting pressure data and grout flow rate data are uploaded to the control terminal of the soil displacement monitoring structure. The subgrade soil layer displacement change data is the soil layer image data of the subgrade surface and side taken by a high-speed camera.

9. The grouting test method for simulating indoor embankment roadbed according to claim 5, characterized in that, The grouting pressure adjustment data and grouting flow rate adjustment data are calculated based on the roadbed soil layer displacement change data, grouting pressure data, and grout flow rate data, including: The displacement data of soil particles is obtained by calculating the displacement of soil particles based on the displacement change data of the subgrade soil layer. Grouting pressure adjustment data and grouting flow rate adjustment data are calculated based on the displacement data of soil particles. Specifically, the calculation is performed according to the preset grouting pressure adjustment formula and grouting flow rate adjustment formula to obtain the grouting pressure adjustment data and grouting flow rate adjustment data.

10. The grouting test method for simulating indoor embankment roadbed according to claim 9, characterized in that, The displacement data of soil particles obtained by calculating the displacement of soil particles based on the displacement change data of the subgrade soil layer includes: The displacement change data of the subgrade soil layer is preprocessed, wherein the displacement vector of particles in the same area is calculated by setting up a displacement calculation function to obtain the displacement vector of all areas of the subgrade soil layer. Based on the displacement vectors of all regions of the subgrade soil layer, the maximum value of the regional displacement function is determined, where the maximum value of the regional displacement function is the maximum vector value of particle displacement in the same region. Calculate the maximum vector value of particle displacement in each region to obtain the soil displacement field within the entire experimental grouting structure; The soil displacement field within the entire experimental grouting structure was transformed into an image to obtain a soil displacement distribution map.

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