A method and device for treating soft soil subgrade by dynamic compaction replacement

Abstract

The present invention provides a method and device for treating soft soil subgrade by dynamic compaction replacement. By conducting on-site surveys of the area where soft soil subgrade needs to be treated by dynamic compaction replacement, basic data information of the area is obtained, and undisturbed soil in the on-site survey area is sampled according to the basic data information. The basic data information includes soil type, moisture content, geological landform, and regional environment; parameters of the collected undisturbed soil are measured. Under the action of dynamic compaction replacement, the drainage performance of soft soil will be improved, thereby increasing the density and shear strength of foundation soil, enhancing the bearing capacity of foundation soil; dynamic compaction replacement can reduce subgrade deformation, make the road surface distribution uniform, and increase the stability and durability of the road surface; compared with traditional road surface treatment methods, dynamic compaction replacement has the advantages of environmental protection, economy, and convenient construction.

Description

Technical Field

[0001] The present invention provides a method and device for treating soft soil subgrade by dynamic compaction replacement, belonging to the technical field of foundation engineering. Background Art

[0002] Poyang Lake area is a large-scale fault basin formed in the Mesozoic and Cenozoic. There is a thick overburden layer widely deposited in the lake area, with complex genesis (glacial facies, alluvial facies, lake-alluvial facies), uneven thickness (1.8 - 52.2m), and diverse lithologies (clay, silty clay, fine silt, medium sand, coarse sand, gravel, cobblestone, and crushed stone, etc.), resulting in significant differences in engineering properties. In particular, there is a large amount of silty clay with high water content in the Poyang Lake area. These silty clays with high water content have poor engineering properties, belong to soft soil, and have a great impact on engineering construction. Such soft soil is generally formed by the alluvial deposition of rivers, with high natural water content, low strength, low permeability, and high rheology. Due to the low strength and large settlement of soft soil, it often brings great harm to road engineering: if not properly treated, the subgrade is extremely prone to slope collapse, large-scale settlement, etc. under the action of vehicle load and its own gravity, which hinders traffic safety and even causes damage to the underground buried pipelines of municipal roads, having a huge impact on the production and life of the area. The treatment of soft soil foundation is a key problem in the construction of infrastructure such as highways, railways, and municipal roads in the Poyang Lake area.

[0003] At present, the main treatment methods for subgrade filled with silty clay with high water content are drainage consolidation, removal and replacement, sunning, dynamic compaction replacement, and various physical and chemical treatments. For large areas of soft soil subgrade with high water content, the drainage consolidation method has a long surcharge time, affecting the construction period; the removal and replacement method requires a large amount of soil excavation and waste disposal, having a greater impact on the environment; sunning requires suitable seasons and weather; and there are also treatment methods such as mixing piles and granular piles, which have a greater impact on the overall cost. For the treatment of large areas of soft soil subgrade, the dynamic compaction replacement method is more economical and reasonable, and can significantly improve the construction efficiency. The dynamic compaction replacement method has the characteristics of changing the properties of subgrade soil, strengthening the subgrade, and adjusting the water content of the subgrade. Its principle is that during the dynamic compaction process, materials with high permeability such as crushed stone and gravel can be rammed into the soil through a certain energy level to achieve the purpose of improving the bearing capacity and controlling the settlement. During the construction process of treating high water content silty clay subgrade by dynamic compaction replacement, the selection of construction parameters is crucial. The selection of parameters such as dynamic compaction replacement materials and replacement pile spacing has a great impact on the dynamic compaction replacement construction. Selecting appropriate dynamic compaction replacement materials and replacement pile spacing can achieve the effect of reducing costs and increasing efficiency in the treatment of soft soil subgrade by dynamic compaction replacement.

[0004] In recent years, dynamic compaction replacement for treating subgrade of high water content silty clay fill has been widely applied in Jiangxi region, accumulating a lot of valuable experience. However, due to the lack of systematic summary and discussion, it is difficult to select dynamic compaction replacement materials and replacement pile spacing in actual construction, and the determination of dynamic compaction replacement construction parameters is too empirical, resulting in excessive dynamic compaction replacement costs or poor treatment effects. Therefore, it is of great practical significance to conduct in-depth theoretical and practical research on dynamic compaction replacement for subgrade of high water content silty clay fill, summarize and induce economic and feasible technical parameters, and provide a certain theoretical and practical basis for engineering construction. Summary of the Invention

[0005] The present invention provides a method and device for treating soft soil subgrade by dynamic compaction replacement, aiming to solve the problem of how to accurately establish the quantitative relationship between different replacement materials, different replacement pile spacings and the treatment effect of dynamic compaction replacement in on-site tests and theoretical analyses.

[0006] A method and device for treating soft soil subgrade by dynamic compaction replacement proposed by the present invention, a method for treating soft soil subgrade by dynamic compaction replacement, the method comprising:

[0007] S1: Conduct on-site surveys on the area where soft soil subgrade needs to be treated by dynamic compaction replacement to obtain the basic data information of the area, and sample the undisturbed soil in the on-site survey area according to the basic data information. The basic data information includes soil type, water content, geological landform and regional environment.

[0008] S2: Measure the parameters of the sampled undisturbed soil. The parameters include undisturbed soil water content, internal pore pressure and soil bearing capacity. Calculate the measured parameters of the undisturbed soil and formulate the basic parameters for dynamic compaction replacement construction. The basic parameters for dynamic compaction replacement construction include tamping energy, number of tamping blows, number of tamping passes and time interval.

[0009] S3: Divide the undisturbed soil sampling area into a first test area, a second test area and a third test area. Each test area corresponds to different replacement materials. Conduct a trial tamping replacement test on the first test area. After the test, set up four monitoring points in the first test area to monitor the post-construction settlement.

[0010] S4: Keep the basic parameters unchanged, conduct trial tamping replacement tests on the second test area and the third test area respectively, and set up four monitoring points in the second test area and the third test area respectively for monitoring; and compare with the first test group to obtain the test results. The test results include the foundation bearing capacity and the water content of the soil between tamping points after construction in the first test area, the second test area and the third test area.

[0011] S5: Organize the test results and conduct theoretical analysis to establish the quantitative relationship between different replacement materials, replacement pile spacing, and the treatment effect of dynamic compaction replacement;

[0012] S6: According to the quantitative relationship, import the optimal pile spacing and replacement filler into the numerical simulation software through numerical simulation to establish a dynamic compaction replacement model, verify the relevant experimental results, and establish relevant empirical parameters based on the verification results.

[0013] Further, conduct on-site surveys on the area where dynamic compaction replacement of soft soil subgrade is required to obtain the basic data information of this area. Sample the undisturbed soil in the on-site survey area according to the basic data information. The basic data information includes soil type, moisture content, geological landform, and regional environment, including:

[0014] S11: Determine the scope of on-site survey according to the scope of the area where dynamic compaction replacement of soft soil subgrade is required, and conduct on-site surveys on this area to obtain the basic data information of this area;

[0015] S12: Select multiple sampling points within the scope of on-site survey. The number of sampling points is denoted as n, where n is a positive integer and n > 1. Label the sampling points according to the sampling order, denoted as the first sampling point... the nth sampling point. The distance between two adjacent sampling points is 47 - 72 meters;

[0016] S13: Select sampling tools according to the soil type in this area to sample the undisturbed soil.

[0017] Further, measure the parameters of the collected undisturbed soil. The parameters include the moisture content of the undisturbed soil, the internal pore pressure, and the soil bearing capacity. Calculate the measured parameters of the undisturbed soil and formulate the basic parameters of dynamic compaction replacement construction. The basic parameters of dynamic compaction replacement construction include the tamping energy, the number of tamping times, the number of tamping passes, and the time interval, including:

[0018] S21: Measure the parameters of the undisturbed soil in multiple areas collected by testing tools respectively to obtain the parameters of the undisturbed soil at each sampling point; the testing tools include a moisture meter and a compression testing machine;

[0019] S22: Analyze the parameters of the undisturbed soil at each sampling point and compare the measured parameter values between each sampling point. If the deviation of the measured parameter values between each sampling point is less than 11%, calculate their weighted average for each parameter. If the deviation is greater than or equal to 11%, repeat the steps of S11 - S13 for sampling and measurement;

[0020] S23: Calculate and formulate the basic parameters of dynamic compaction replacement construction according to the measured parameters of the undisturbed soil;

[0021] S24: Record the sampling process, and the recorded information includes the sampling location, sampling time, ground elevation, testing tools, and test results.

[0022] Further, divide the undisturbed soil sampling area into a first test area, a second test area, and a third test area. Each test area corresponds to different replacement materials, and the replacement materials include crushed stones, construction waste, and slag. The first test area corresponds to crushed stones, the second area corresponds to solid construction waste, and the third area corresponds to slag. Each test area is further divided into three replacement areas, and each replacement area corresponds to a different replacement pile spacing. The replacement pile spacings are 4m, 5m, and 6m respectively. The first test area includes the 1.1 replacement area, the 1.2 replacement area, and the 1.3 replacement area. The second test area includes the 2.1 replacement area, the 2.2 replacement area, and the 2.3 replacement area. The third test area includes the 3.1 replacement area, the 3.2 replacement area, and the 3.3 replacement area. The replacement spacings of the 1.1 replacement area, the 2.1 replacement area, and the 3.1 replacement area are 4m. The replacement spacings of the 1.2 replacement area, the 2.2 replacement area, and the 3.2 replacement area are 5m. The replacement pile spacings of the 1.3 replacement area, the 2.3 replacement area, and the 3.3 replacement area are 6m.

[0023] Further, conduct a trial dynamic replacement test on the first test area according to the basic parameters of the dynamic replacement construction. The specific test steps include: laying 1.0m of filler at the position of the point tamping points, and performing dynamic compaction operations with a tamping hammer. After the depth of the tamping pit exceeds 1.0m during the dynamic compaction process, evenly lay filler into the tamping pit. The thickness of the laid filler is 0.5m. After laying the filler, continue the dynamic compaction operation. Stop the dynamic compaction operation when the average tamping settlement of the last two blows is less than 50mm. If the average tamping settlement of the last two blows is still greater than 50mm during the dynamic compaction, continue to add filler step by step for dynamic compaction.

[0024] Further, the diameter of the tamping hammer is 2m, the tamping energy of the point tamping is 2000KN·m, the tamping energy of the full tamping is 1000KN·m. There are 2 passes of point tamping, 4 - 6 blows per pass, 1 pass of full tamping, 3 - 5 blows per pass. Record the tamping settlement and the number of tamping blows during the tamping process. After the tamping is completed, use the plate load test method to determine the bearing capacity of the subgrade.

[0025] Further, set four monitoring points in the first test area to monitor the first test area and monitor the post - construction settlement. The monitoring points are divided into monitoring point 1, monitoring point 2, monitoring point 3, and monitoring point 4. Monitoring point 1 is set on the ground surface, monitoring point 2 is set 0.25 meters below the ground surface, monitoring point 3 is set 0.5 meters below the ground surface, and monitoring point 2 is set 0.75 meters below the ground surface.

[0026] Further, data collation and theoretical analysis are performed on the test results to establish a quantitative law between different replacement materials, replacement pile spacings, and the dynamic compaction replacement treatment effect, including:

[0027] S51: Collate and summarize the experimental results, including the foundation bearing capacity and rammed earth moisture content after construction in the first test area, the second test area, and the third test area;

[0028] S52: Quantify and statistically analyze the experimental results with the replacement materials and replacement pile spacings. The statistical analysis includes variance analysis and regression analysis; obtain the relationship between the dynamic compaction replacement treatment effect and different replacement material replacement piles.

[0029] Further, according to the quantitative law, the optimal pile spacing and replacement filler are imported into the numerical simulation software through numerical simulation to establish a dynamic compaction replacement model, verify the relevant experimental results, and establish relevant empirical parameters based on the verification results, including:

[0030] S61: Analyze according to the quantitative law, determine the optimal replacement filler and pile spacing, and conduct simulations for different situations respectively;

[0031] S62: Select a suitable numerical simulation software to establish a model;

[0032] S63: Set the parameters of the model. The parameters include the property parameters of the foundation soil mass, the property parameters of the replacement layer material, the replacement pile spacing parameters, the rammer standard, and the tamping force;

[0033] S64: Perform numerical simulation calculations according to the set parameters of the model and obtain the simulation calculation results; compare the simulation results with the experimental data, and correct and optimize the simulation results;

[0034] S65: Based on the completed numerical simulation results, establish a corresponding empirical parameter model. The empirical parameter model includes the relationship between the dynamic compaction replacement treatment effect and different replacement materials and replacement pile spacings, as well as the improvement amplitude of the foundation bearing capacity after dynamic compaction treatment and the relationship between the tamping energy and the soil plane response;

[0035] S66: Regularly inspect and optimize the established empirical parameter model to ensure its effectiveness and reliability, and continuously improve and adjust the model in combination with practical experience to provide a scientific basis for actual construction.

[0036] A dynamic compaction replacement soft soil subgrade treatment device provided by the present invention, the device includes a data collector, a memory, and a processor. A duplex communication connection is carried out between the output end of the data collector and the input end of the processor, and a duplex communication connection is carried out between the output end of the processor and the input end of the memory. When the processor performs dynamic compaction replacement of the soft soil subgrade, the steps of the method described in claims 1-9 are implemented.

[0037] Advantages of the present invention: Under the action of dynamic compaction replacement, the drainage performance of soft soil will be improved, thereby improving the density and shear strength of the foundation soil, increasing the bearing capacity of the foundation soil; dynamic compaction replacement can reduce the subgrade deformation, make the road surface distribution uniform, and increase the stability and durability of the road surface; compared with traditional road surface treatment methods, dynamic compaction replacement has the advantages of environmental protection, economy, and convenient construction; the replacement materials mostly use recycled waste materials, such as gravel, construction waste, and slag, which not only improve the soil conditions, but also effectively reduce environmental pollution. At the same time, the construction is simple and easy to implement, with low labor and material costs, and can greatly reduce the project cost; the treatment effect of dynamic compaction replacement is lasting and stable, and the long-term maintenance is simple and convenient, which is conducive to maintenance and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of dynamic compaction replacement of a dynamic compaction replacement soft soil subgrade treatment device described in the present invention;

[0039] Figure 2 It is an implementation route map of a dynamic compaction replacement soft soil subgrade treatment method described in the present invention;

[0040] Figure 3 It is a step diagram of a dynamic compaction replacement soft soil subgrade treatment method described in the present invention;

[0041] Figure 4 It is a schematic plan view of the first test area of a dynamic compaction replacement soft soil subgrade treatment method described in the present invention;

[0042] Figure 5 It is a schematic diagram of the monitoring point setting of a dynamic compaction replacement soft soil subgrade treatment method described in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0043] In order to be able to more clearly understand the above objects, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0046] An embodiment of the present invention is a method for treating a soft soil subgrade by dynamic compaction replacement. The method includes:

[0047] S1: Through on-site survey of the area where dynamic compaction replacement of the soft soil subgrade is required, basic data information of the area is obtained, and undisturbed soil in the on-site survey area is sampled according to the basic data information. The basic data information includes soil type, moisture content, geological landform, and regional environment.

[0048] S2: Parameters of the collected undisturbed soil are measured. The parameters include undisturbed soil moisture content, internal pore pressure, and soil bearing capacity. The measured parameters of the undisturbed soil are calculated and basic parameters for dynamic compaction replacement construction are formulated. The basic parameters for dynamic compaction replacement construction include tamping energy, number of tamping blows, number of tamping passes, and time interval.

[0049] S3: The undisturbed soil sampling area is divided into a first test area, a second test area, and a third test area. Each test area corresponds to different replacement materials. A trial tamping replacement test experiment is carried out on the first test area. After the experiment, four monitoring points are set in the first test area to monitor the post-construction settlement.

[0050] S4: Keeping the basic parameters unchanged, trial tamping replacement test experiments are carried out on the second test area and the third test area respectively, and four monitoring points are set in the second test area and the third test area respectively for monitoring; and compared with the first test group to obtain experimental results. The experimental results include the foundation bearing capacity and the moisture content of the soil between tamping points after construction in the first test area, the second test area, and the third test area.

[0051] S5: The test results are sorted out and theoretically analyzed to establish a quantitative law between different replacement materials, replacement pile spacing, and the treatment effect of dynamic compaction replacement; the quantitative law is the technical parameters of dynamic compaction replacement construction that can achieve the foundation treatment effect and are economically reasonable.

[0052] S6: According to the quantization law, the optimal pile spacing and replacement filler are introduced into the numerical simulation software through numerical simulation to establish a dynamic compaction replacement model, verify the relevant experimental results, and establish relevant empirical parameters based on the verification results, providing a basis for subsequent dynamic compaction replacement treatment of soft soil subgrade.

[0053] The working principle of the above technical solution is as follows: Through on-site survey of the area where dynamic compaction replacement of soft soil subgrade is required, the basic data information of the area is obtained. According to the basic data information, the undisturbed soil in the on-site survey area is sampled. The basic data information includes soil type, moisture content, geological landform, and regional environment. The parameters of the collected undisturbed soil are measured, and the parameters include undisturbed soil moisture content, internal pore pressure, and soil bearing capacity. The measured undisturbed soil parameters are calculated and the basic parameters of dynamic compaction replacement construction are formulated. The basic parameters of dynamic compaction replacement construction include tamping energy, number of tamping times, number of tamping passes, and time interval. The undisturbed soil sampling area is divided into the first test area, the second test area, and the third test area. Each test area corresponds to different replacement materials. A trial tamping replacement test is carried out on the first test area. After the test, four monitoring points are set in the first test area to monitor the post-construction settlement. Keeping the basic parameters unchanged, trial tamping replacement tests are carried out on the second test area and the third test area respectively, and four monitoring points are set in the second test area and the third test area respectively for monitoring. And compared with the first test group to obtain the experimental results. The experimental results include the foundation bearing capacity and the moisture content of the soil between the rammers after the construction of the first test area, the second test area, and the third test area. The test results are sorted out and theoretically analyzed to establish the quantization law between different replacement materials, replacement pile spacing, and the treatment effect of dynamic compaction replacement. The quantization law is the dynamic compaction replacement construction technical parameters that can achieve the foundation treatment effect and are economically reasonable. According to the quantization law, the optimal pile spacing and replacement filler are introduced into the numerical simulation software through numerical simulation to establish a dynamic compaction replacement model, verify the relevant experimental results, and establish relevant empirical parameters based on the verification results, providing a basis for subsequent dynamic compaction replacement treatment of soft soil subgrade.

[0054] The effects of the above technical solutions are as follows: The above method obtains basic data information through on-site surveys and parameter measurements, and uses the method of trial tamping replacement testing for refined processing. Different replacement materials are used according to different test areas. While keeping the basic parameters unchanged, by comparing the moisture content of the soil between rammers and the bearing capacity of the foundation in different areas, a quantitative law between different replacement materials, replacement pile spacing, and the treatment effect of dynamic compaction replacement is established, providing a basis for subsequent dynamic compaction replacement treatment of soft soil subgrades; by dividing the test area and setting four monitoring points to monitor different test areas, the authenticity and reliability of the treatment effect can be ensured, and the treatment parameters can be adjusted in a timely manner to achieve the best treatment effect; through the method of trial tamping replacement testing, the cost and difficulty of dynamic compaction replacement treatment of soft soil subgrades can be greatly reduced, and on the premise of ensuring the treatment effect, the most economical and reasonable treatment parameters can be found; by establishing a model, numerical simulation can be carried out according to the optimal pile spacing and appropriate replacement filling materials to further verify the relevant experimental results to determine the best treatment parameters and plans, thereby improving the treatment effect; through simulation analysis using numerical simulation software, the effects of different treatment plans can be predicted and their advantages and disadvantages can be compared, avoiding blind attempts in actual projects and reducing unnecessary costs; through numerical simulation software, the optimal treatment parameters and plans can be obtained more quickly and conveniently, thereby accelerating the progress of the construction period and improving the efficiency of the project. Establishing relevant empirical parameters based on the verification results can provide a reliable technical basis for subsequent dynamic compaction replacement treatment of soft soil subgrades, so as to carry out more accurate and efficient treatment in actual projects.

[0055] In one embodiment of the present invention, the method includes on-site surveying the area where dynamic compaction replacement of soft soil subgrade is required to obtain the basic data information of the area, and sampling the undisturbed soil in the on-site survey area according to the basic data information. The basic data information includes soil type, moisture content, geological landform, and regional environment, including:

[0056] S11: Determine the scope of on-site survey according to the area where dynamic compaction replacement of soft soil subgrade is required, and conduct on-site survey on this area to obtain the basic data information of this area;

[0057] S12: Select multiple sampling points within the scope of on-site survey required. The number of sampling points is denoted as n, where n is a positive integer and n > 1, and label the sampling points according to the sampling order, denoted as the first sampling point... the nth sampling point. The distance between two adjacent sampling points is 47 - 72 meters;

[0058] S13: Select sampling tools according to the soil type of this area to sample the undisturbed soil; the sampling tools include soil drill rods, soil sample shovels, soil sample supports, soil sample pliers, soil sample tubes, and core drills.

[0059] The working principle of the above technical solution is as follows: Determine the range that needs to be surveyed on-site according to the area range of the dynamic compaction replacement of soft soil subgrade as required, and conduct on-site surveys on this area to obtain the basic data information of this area; Select multiple sampling points within the range that needs to be surveyed on-site. The number of sampling points is denoted as n, where n is a positive integer and n > 1, and label the sampling points according to the sampling order, denoted as the first sampling point... the nth sampling point. The distance between two adjacent sampling points is 47 - 72 meters; And select a sampling tool according to the soil type of this area to sample the undisturbed soil; The sampling tool includes a soil drill rod, a soil sample shovel, a soil sample support, a soil sample clamp, a soil sample tube, and a core drill. The soil drill rod is a commonly used tool in relatively shallow soil layers and can drive the drill bit into the soil to obtain soil samples. The soil sample shovel is suitable for relatively shallow, loose soil layers or surface soil. When in use, the soil sample shovel can be inserted into the soil, and then the soil sample can be dug out from the shovel opening. The soil sample support is suitable for relatively deep soil layers or relatively compact soils, and its main function is to stabilize the soil environment and prevent soil sample collapse; The soil sample support has different shapes and sizes, and appropriate models can be selected according to needs. The soil sample clamp is suitable for relatively deep and compact soil layers and can extend the pliers into the soil to clamp soil samples. The soil sample tube: is suitable for obtaining soil samples with a larger diameter. The core drill is suitable for taking soil layers with strong lithology, such as shale, etc.

[0060] The effects of the above technical solutions are as follows: Through on-site survey, the scope of the area that needs to be treated by dynamic compaction replacement can be determined based on the actual situation, avoiding the work difficulty and resource waste caused by inaccurate scope determination; Through on-site survey, the actual situation within the area can be obtained, such as data on geological, soil, terrain, hydrology, meteorology and other factors, providing basic data support for subsequent simulation and calculation, and improving the reliability and implementation effect of local treatment by dynamic compaction replacement; By selecting multiple sampling points and numbering them according to the sampling order, the original soil conditions in the area can be comprehensively understood, and at the same time, appropriate soil sampling tools can be selected according to the actual situation, such as soil drill rods, soil sample shovels, soil sample supports, soil sample pliers, soil sample tubes and core drills, etc., to ensure accurate and effective sampling; Through sampling and analysis at multiple sampling points, the error of samples can be reduced, the accuracy and precision of data can be improved, and the reference value of implementing dynamic compaction replacement treatment can be increased. Among them, the distance between the above sampling points is set at 47 - 72 meters, which can ensure that the soil types represented by each sampling point are real and effective, so as to more comprehensively reflect the soil conditions in this area. Within the range of 47 - 72 meters of the sampling point distance, the problem of mixing between the original soil samples of different sampling points can be better avoided, which is beneficial to the accuracy and precision of the sample analysis results. At the same time, the distance between sampling points should not be too large, otherwise it may affect the comparison and analysis between soil types. Within the range of 47 - 72 meters of the distance, a sufficient number of sample groups can be obtained, which is beneficial to reducing the influence of instantaneous factors and improving the reliability of data sampling. In addition, a reasonable sampling point distance can also eliminate the uncertainty caused by factors such as terrain and soil layer thickness, ensuring the true reliability of data sampling.

[0061] In an embodiment of the present invention, for the collected original soil, parameter determination is carried out, and the parameters include the water content of the original soil, the internal pore pressure and the soil body bearing capacity. The determined original soil parameters are calculated and the basic parameters for dynamic compaction replacement construction are formulated. The basic parameters for dynamic compaction replacement construction include the tamping energy, the number of tamping times, the number of tamping passes and the time interval, including:

[0062] S21: Respectively carry out parameter determination on the original soil in multiple areas collected by means of testing tools to obtain the original soil parameters of each sampling point; the testing tools include a moisture meter and a compression testing machine;

[0063] S22: Analyze the original soil parameters of each sampling point and compare the measured parameter values between each sampling point. If the deviation of the parameter values measured between each sampling point is less than 11%, weighted calculation is carried out on them to obtain the average value of each parameter. If the deviation is greater than or equal to 11%, repeat the steps of S11 - S13 for sampling and measurement;

[0064] S23: Calculate according to the determined original soil parameters and formulate the basic parameters for dynamic compaction replacement construction;

[0065] S24: Record the sampling process, and the recorded information includes the sampling location, sampling time, ground elevation, testing tool, and test result.

[0066] The working principle of the above technical solution is as follows: Use the testing tool to measure the parameters of the undisturbed soil in multiple sampled areas respectively to obtain the undisturbed soil parameters of each sampling point; the testing tool includes a moisture meter and a compression testing machine; analyze the undisturbed soil parameters of each sampling point and compare the measured parameter values between each sampling point. If the deviation of the parameter values measured between each sampling point is less than 11%, perform weighted calculation to obtain the average value of each parameter. If the deviation is greater than or equal to 11%, repeat the steps of S11 - S13 for sampling and calculation; calculate based on the measured undisturbed soil parameters and formulate the basic parameters for dynamic compaction replacement construction; record the sampling process, and the recorded information includes the sampling location, sampling time, ground elevation, testing tool, and test result.

[0067] The effects of the above technical solution are as follows: Through the above method, the undisturbed soil parameters of each sampling point can be accurately obtained, providing relatively detailed geological data for the engineering design of the entire area; by analyzing and comparing the measured parameters, the differences between each sampling point can be found, and then reasonable decisions can be made. For the case where the deviation is less than 11%, weighted calculation can better reflect the overall situation. For the case where the deviation is greater than or equal to 11%, re - sampling and calculation are required to ensure accuracy; formulating the basic parameters for dynamic compaction replacement construction based on the measured undisturbed soil parameters can make the construction more scientific and reasonable, improve construction efficiency and quality, and reduce construction costs; recording the sampling process can effectively avoid data loss and errors, ensure the integrity and accuracy of the data, and facilitate future query and processing. Limiting the deviation of parameter measurement within 11% can improve the accuracy, reliability, and statistical effect of the data, reduce the influence of errors, and thus provide more valuable data support and guidance for subsequent engineering design and construction.

[0068] In an embodiment of the present invention, the undisturbed soil sampling area is divided into a first test area, a second test area, and a third test area. Each test area corresponds to a different replacement material, and the replacement materials include crushed stones, construction waste, and slag. The first test area corresponds to crushed stones, the second area corresponds to solid construction waste, and the third area corresponds to slag. Each test area is further divided into three replacement areas, and each replacement area corresponds to a different replacement pile spacing. The replacement pile spacings are 4m, 5m, and 6m respectively. The first test area further includes the 1.1 replacement area, the 1.2 replacement area, and the 1.3 replacement area. The second test area further includes the 2.1 replacement area, the 2.2 replacement area, and the 2.3 replacement area. The third test area further includes the 3.1 replacement area, the 3.2 replacement area, and the 3.3 replacement area. The replacement spacing of the 1.1 replacement area, the 2.1 replacement area, and the 3.1 replacement area is 4m. The replacement spacing of the 1.2 replacement area, the 2.2 replacement area, and the 3.2 replacement area is 5m. The replacement pile spacing of the 1.3 replacement area, the 2.3 replacement area, and the 3.3 replacement area is 6m.

[0069] The working principle of the above technical solution is as follows: The undisturbed soil sampling area is divided into a first test area, a second test area, and a third test area. Each test area corresponds to a different replacement material, and the replacement materials include crushed stones, construction waste, and slag. The first test area corresponds to crushed stones, the second area corresponds to solid construction waste, and the third area corresponds to slag. Each test area is further divided into three replacement areas, and each replacement area corresponds to a different replacement pile spacing. The replacement pile spacings are 4m, 5m, and 6m respectively. The first test area further includes the 1.1 replacement area, the 1.2 replacement area, and the 1.3 replacement area. The second test area further includes the 2.1 replacement area, the 2.2 replacement area, and the 2.3 replacement area. The third test area further includes the 3.1 replacement area, the 3.2 replacement area, and the 3.3 replacement area. The replacement spacing of the 1.1 replacement area, the 2.1 replacement area, and the 3.1 replacement area is 4m. The replacement spacing of the 1.2 replacement area, the 2.2 replacement area, and the 3.2 replacement area is 5m. The replacement pile spacing of the 1.3 replacement area, the 2.3 replacement area, and the 3.3 replacement area is 6m.

[0070] The effects of the above technical solutions are as follows: By setting different test areas, different replacement materials, and different replacement pile spacings, more comprehensive data can be obtained to understand the properties, deformation characteristics, etc. of the undisturbed soil under different conditions; Through the testing of various replacement materials and replacement pile spacings, the optimal undisturbed soil improvement plan can be found to improve the stability and bearing capacity of the foundation project; After the experimental testing, the existing design plan can be optimized and improved through more detailed data analysis and statistics; Through the experimental testing, the construction plan can be determined, thereby improving the project quality and enhancing the safety and reliability of the project.

[0071] In an embodiment of the present invention, a trial tamping replacement test experiment is carried out on the first test area according to the basic parameters for formulating dynamic compaction replacement construction. The specific test experiment steps include: Laying 1.0 m of filler at the position of the point tamping points, and performing dynamic compaction operation through a tamping hammer. After the depth of the tamping pit exceeds 1.0 m during the dynamic compaction process, uniformly lay filler into the tamping pit. The thickness of the laid filler is 0.5 m. After laying the filler, continue the dynamic compaction operation. Stop the dynamic compaction operation when the average tamping settlement of the last two blows is less than 50 mm. If the average tamping settlement of the last two blows is still greater than 50 mm during the dynamic compaction, continue to add filler step by step for dynamic compaction.

[0072] The diameter of the tamping hammer is 2 m, the tamping energy of the point tamping is 2000 KN·m, the tamping energy of the full tamping is 1000 KN·m. The point tamping is carried out for 2 passes, 4 - 6 blows per pass, the full tamping is carried out for 1 pass, 3 - 5 blows per pass. Record the tamping settlement and the number of tamping blows during the tamping process; After the tamping is completed, use the plate load method to measure the bearing capacity of the roadbed. If the bearing capacity is greater than 150 kPa, the bearing capacity requirement is met.

[0073] The working principle of the above technical solutions is as follows: Laying 1.0 m of filler at the position of the point tamping points, and performing dynamic compaction operation through a tamping hammer. After the depth of the tamping pit exceeds 1.0 m during the dynamic compaction process, uniformly lay filler into the tamping pit. The thickness of the laid filler is 0.5 m. After laying the filler, continue the dynamic compaction operation. Stop the dynamic compaction operation when the average tamping settlement of the last two blows is less than 50 mm. If the average tamping settlement of the last two blows is still greater than 50 mm during the dynamic compaction, continue to add filler step by step for dynamic compaction. The diameter of the tamping hammer is 2 m, the tamping energy of the point tamping is 2000 KN·m, the tamping energy of the full tamping is 1000 KN·m. The point tamping is carried out for 2 passes, 4 - 6 blows per pass, the full tamping is carried out for 1 pass, 3 - 5 blows per pass. Record the tamping settlement and the number of tamping blows during the tamping process; After the tamping is completed, use the plate load method to measure the bearing capacity of the roadbed. If the bearing capacity is greater than 150 kPa, the bearing capacity requirement is met.

[0074] The effects of the above technical solution are as follows: By using the point ramming method to compact the filler, the density and stability of the filler can be increased, thereby improving the bearing capacity and settlement resistance of the subgrade. Using a rammer for dynamic compaction operations can effectively control the compaction degree and depth of the filler. Moreover, the rammer has a large diameter, high compaction efficiency, and can quickly complete the subgrade filling project. During the ramming process, the ramming settlement and the number of ramming blows are recorded to detect and adjust the compaction degree, ensuring the compaction quality of the filler. Finally, the plate load test method is used to measure the bearing capacity of the subgrade, which can ensure that the bearing capacity of the subgrade meets the design requirements and improves the safety of road use.

[0075] An embodiment of the present invention is as Figure 5 shown. Four monitoring points are set in the first test area to monitor the first test area and monitor the post-construction settlement. The monitoring points are divided into monitoring point 1, monitoring point 2, monitoring point 3, and monitoring point 4. Monitoring point 1 is set on the ground surface, monitoring point 2 is set 0.25 meters below the ground surface, monitoring point 3 is set 0.5 meters below the ground surface, and monitoring point 2 is set 0.75 meters below the ground surface. Monitoring point 1, monitoring point 2, and monitoring point 3 are respectively located at the vertical underground positions of the center lines of the edges of the 1.1 replacement area, the 1.2 replacement area, and the 1.3 replacement area. Monitoring point 4 is located on the vertical connection line of the center point of the edge of the 1.2 replacement area and the connection line of the 1.1 replacement area and the 1.3 replacement area close to the 1.2 replacement area.

[0076] The working principle of the above technical solution is as follows: Four monitoring points are set in the first test area to monitor the first test area and monitor the post-construction settlement. The monitoring points are divided into monitoring point 1, monitoring point 2, monitoring point 3, and monitoring point 4. Monitoring point 1 is set on the ground surface, monitoring point 2 is set 0.25 meters below the ground surface, monitoring point 3 is set 0.5 meters below the ground surface, and monitoring point 2 is set 0.75 meters below the ground surface. Monitoring point 1, monitoring point 2, and monitoring point 3 are respectively located at the vertical underground positions of the center lines of the edges of the 1.1 replacement area, the 1.2 replacement area, and the 1.3 replacement area. Monitoring point 4 is located on the vertical connection line of the center point of the edge of the 1.2 replacement area and the connection line of the 1.1 replacement area and the 1.3 replacement area close to the 1.2 replacement area.

[0077] The effects of the above technical solutions are as follows: By conducting real-time and regular settlement monitoring at monitoring points, settlement problems of the roadbed can be detected in a timely manner, avoiding excessive settlement of the roadbed caused by cumulative settlement and ensuring the safety of the roadbed; Monitoring points at different depths can monitor the settlement situation more precisely, conduct a more detailed analysis and evaluation of the influence depth of the roadbed, which is conducive to engineering quality control and design optimization; The accumulation and analysis of the data of the monitoring points can form a scientific evaluation system, including indicators such as settlement rate and settlement well effect, which can help engineering managers accurately evaluate the construction effect and the bearing capacity of the roadbed; Through the analysis of the monitoring data, it can be used as a reference basis for subsequent roadbed adjustment or optimized design according to the actual situation.

[0078] Taking the setting of four monitoring points in the first test area as an example, where monitoring points 1 to 4 are respectively set at the ground surface, 0.25 meters below the ground surface, 0.5 meters below the ground surface, and 0.75 meters below the ground surface, it can more comprehensively monitor the soil layer settlement situation in this area. At the same time, through the comparative analysis of the settlement data of different monitoring points, the bearing capacity and stability of the roadbed can be further refined and evaluated, providing strong support for the subsequent adjustment or design of the project.

[0079] In one embodiment of the present invention, the test results are sorted out and theoretically analyzed to establish a quantitative law between different replacement materials, replacement pile spacings and the treatment effect of dynamic compaction replacement, including:

[0080] S51: Sort out and summarize the experimental results, including the foundation bearing capacity and rammed earth moisture content after the construction of the first test area, the second test area and the third test area;

[0081] S52: Conduct quantitative and statistical analysis on the experimental results, the replacement materials and the replacement pile spacing. The statistical analysis includes variance analysis and regression analysis; Obtain the relationship between the treatment effect of dynamic compaction replacement and different replacement material replacement piles.

[0082] The working principle of the above technical solution is: Sort out and summarize the experimental results, including the foundation bearing capacity and rammed earth moisture content after the construction of the first test area, the second test area and the third test area; Conduct quantitative and statistical analysis on the experimental results, the replacement materials and the replacement pile spacing. The statistical analysis includes variance analysis and regression analysis; Obtain the relationship between the treatment effect of dynamic compaction replacement and different replacement material replacement piles.

[0083] The effects of the above technical solutions are as follows: Through quantification and statistical analysis, the accuracy and reliability of test data can be analyzed to ensure the accuracy of data analysis; through variance analysis and regression analysis, the effects of different replacement materials, replacement pile spacings, etc. on the foundation bearing capacity can be found, and then the design scheme can be optimized; by analyzing the test results of different combination schemes, the best dynamic compaction replacement treatment effect and the best replacement materials, replacement pile spacings, etc. can be determined to improve the project quality. Quantitatively and statistically analyzing the experimental results with the replacement materials and replacement pile spacings can help engineers analyze the data more accurately, find the influencing factors, optimize the design, and then determine the best scheme to improve the project quality.

[0084] In an embodiment of the present invention, according to the quantization law, the optimal pile spacing and replacement filler are introduced into the numerical simulation software through numerical simulation to establish a dynamic compaction replacement model, verify the relevant experimental results, and establish relevant empirical parameters according to the verification results, including:

[0085] S61: Analyze according to the quantization law to determine the optimal replacement filler and pile spacing, and perform simulations separately for different situations;

[0086] S62: Select a suitable numerical simulation software to establish a model; the model includes the influence of factors such as the lateral downward extrusion load, tamping force, and the gravity of the soil itself.

[0087] S63: Set the parameters of the model, and the parameters include the property parameters of the foundation soil, the property parameters of the replacement layer material, the replacement pile spacing parameters, the tamping hammer standard, and the tamping force; and perform finite element mesh division.

[0088] S64: Perform numerical simulation calculations according to the set parameters of the model and obtain the simulation calculation results; compare the simulation results with the experimental data, and correct and optimize the simulation results;

[0089] S65: Based on the completed numerical simulation results, establish a corresponding empirical parameter model, and the empirical parameter model includes the relationship between the dynamic compaction replacement treatment effect and different replacement materials, replacement pile spacings, as well as the improvement amplitude of the foundation bearing capacity after dynamic compaction treatment, and the relationship between the tamping energy and the soil plane reaction;

[0090] S66: Regularly inspect and optimize the established empirical parameter model to ensure its effectiveness and reliability, and continuously improve and adjust the model in combination with practical experience to provide a scientific basis for actual construction.

[0091] The working principle of the above technical solution is as follows: According to the analysis of quantization rules, the optimal replacement filler and pile spacing are determined, and simulations are carried out separately for different situations; appropriate numerical simulation software is selected to establish a model; the model includes the influence of factors such as lateral downward extrusion load, tamping force, and the gravity of the soil itself. The parameters of the model are set, and the parameters include the property parameters of the foundation soil, the property parameters of the replacement layer material, the replacement pile spacing parameters, the rammer standard, and the tamping force; and finite element mesh division is carried out. Numerical simulation calculations are performed according to the set parameters of the model, and the simulation calculation results are obtained; the simulation results are compared with the experimental data, and the simulation results are corrected and optimized; based on the completed numerical simulation results, a corresponding empirical parameter model is established, and the empirical parameter model includes the relationship between the dynamic compaction replacement treatment effect and different replacement materials and replacement pile spacing, as well as the improvement range of the foundation bearing capacity after dynamic compaction treatment and the relationship between the tamping energy and the soil plane response; the established empirical parameter model is regularly inspected and optimized to ensure its effectiveness and reliability, and the model is continuously improved and adjusted in combination with practical experience to provide a scientific basis for actual construction.

[0092] The effects of the above technical solution are as follows: By scientifically and systematically determining the optimal replacement filler and pile spacing, the construction efficiency can be improved, and unnecessary waste of manpower and material resources can be reduced; through numerical simulation calculations, parameters such as the foundation bearing capacity and the moisture content of the rammed soil under different conditions can be simulated, and the parameters can be corrected and optimized, thereby optimizing the design scheme and improving the project quality; by establishing an empirical parameter model, the experimental data and the numerical simulation calculation results can be combined to obtain parameters such as the relationship between the dynamic compaction replacement treatment effect and different replacement materials and replacement pile spacing, and a scientific and reliable empirical parameter model can be constructed; by regularly inspecting and optimizing the empirical parameter model, its effectiveness and reliability can be ensured, and the actual project benefits can be improved.

[0093] An embodiment of the present invention is a device for treating a soft soil subgrade by dynamic compaction replacement. The device includes a data collector, a memory, and a processor. A duplex communication connection is carried out between the output end of the data collector and the input end of the processor, and a duplex communication connection is carried out between the output end of the processor and the input end of the memory. When the processor executes the treatment of the soft soil subgrade by dynamic compaction replacement, the steps of the method described in claims 1-9 are implemented.

[0094] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A method for treating soft soil subgrade by dynamic compaction replacement, characterized in that, The method includes: S1: By conducting on-site surveys on the area where dynamic compaction replacement of soft soil subgrade is required, obtaining the basic data information of this area, and sampling the undisturbed soil in the on-site survey area according to the basic data information. The basic data information includes soil type, moisture content, geological landform, and regional environment; S2: Measuring the parameters of the collected undisturbed soil. The parameters include undisturbed soil moisture content, internal pore pressure, and soil bearing capacity. Calculating the measured undisturbed soil parameters and formulating the basic parameters for dynamic compaction replacement construction. The basic parameters for dynamic compaction replacement construction include tamping energy, number of tamping times, number of tamping passes, and time interval; S3: Divide the undisturbed soil sampling area into a first test area, a second test area, and a third test area. Each test area corresponds to different replacement materials. Conduct a trial tamping replacement test on the first test area. After the test, set up four monitoring points in the first test area to monitor the post-construction settlement; S4: Keep the basic parameters unchanged, conduct trial tamping replacement tests on the second test area and the third test area respectively, and set up four monitoring points in the second test area and the third test area respectively for monitoring; and compare with the first test group to obtain the test results. The test results include the foundation bearing capacity and the moisture content of the soil between tamping points after construction in the first test area, the second test area, and the third test area; S5: Organize the data and conduct theoretical analysis on the test results to establish the quantitative relationship between different replacement materials, replacement pile spacing, and the treatment effect of dynamic compaction replacement; S6: According to the quantitative relationship, import the optimal pile spacing and replacement filler into the numerical simulation software through numerical simulation, establish a dynamic compaction replacement model, verify the relevant test results, and establish relevant empirical parameters according to the verification results.

2. The dynamic compaction replacement method for treating soft soil subgrade according to claim 1, wherein, The process of conducting on-site surveys on the area where dynamic compaction replacement of soft soil subgrade is required, obtaining the basic data information of this area, and sampling the undisturbed soil in the on-site survey area according to the basic data information. The basic data information includes soil type, moisture content, geological landform, and regional environment, includes: S11: Determine the scope of on-site survey according to the scope of the area where dynamic compaction replacement of soft soil subgrade is required, and conduct on-site surveys on this area to obtain the basic data information of this area; S12: Select multiple sampling points within the scope of on-site survey. The number of sampling points is denoted as n, where n is a positive integer and n>1. Number the sampling points according to the sampling order, denoted as the first sampling point... the nth sampling point. The distance between two adjacent sampling points is 47 - 72 meters; S13: Select sampling tools according to the soil type in this area to sample the undisturbed soil.

3. The dynamic compaction replacement method for treating soft soil subgrade according to claim 1, characterized in that The process of measuring the parameters of the collected undisturbed soil. The parameters include undisturbed soil moisture content, internal pore pressure, and soil bearing capacity. Calculating the measured undisturbed soil parameters and formulating the basic parameters for dynamic compaction replacement construction. The basic parameters for dynamic compaction replacement construction include tamping energy, number of tamping times, number of tamping passes, and time interval, includes: S21: Use a testing tool to separately measure the parameters of undisturbed soil samples from multiple areas, and obtain the parameters of the undisturbed soil at each sampling point. The testing tool includes a moisture meter and a compression testing machine. S22: Analyze the parameters of the undisturbed soil at each sampling point and compare the measured parameter values among the sampling points. If the deviation of the parameter values measured among the sampling points is less than 11%, perform a weighted calculation to obtain the average value of each parameter. If the deviation is greater than or equal to 11%, repeat the steps of S11 - S13 for sampling and measurement. S23: Calculate based on the measured parameters of the undisturbed soil and formulate the basic parameters for dynamic compaction replacement construction. S24: Record the sampling process, and the recorded information includes the sampling location, sampling time, ground elevation, testing tool, and test results.

4. The dynamic compaction replacement method for soft soil subgrade treatment according to claim 1, characterized in that The undisturbed soil sampling area is divided into a first test area, a second test area, and a third test area. Each test area corresponds to different replacement materials, and the replacement materials include crushed stone, construction waste, and slag. The first test area corresponds to crushed stone, the second area corresponds to solid construction waste, and the third area corresponds to slag. Each test area is further divided into three replacement areas, and each replacement area corresponds to a different replacement pile spacing. The replacement pile spacings are 4m, 5m, and 6m respectively. The first test area includes the 1.1 replacement area, the 1.2 replacement area, and the 1.3 replacement area. The second test area includes the 2.1 replacement area, the 2.2 replacement area, and the 2.3 replacement area. The third test area includes the 3.1 replacement area, the 3.2 replacement area, and the 3.3 replacement area. The replacement spacing of the 1.1 replacement area, the 2.1 replacement area, and the 3.1 replacement area is 4m. The replacement spacing of the 1.2 replacement area, the 2.2 replacement area, and the 3.2 replacement area is 5m. The replacement pile spacing of the 1.3 replacement area, the 2.3 replacement area, and the 3.3 replacement area is 6m.

5. The dynamic compaction replacement method for soft soil subgrade according to claim 1, characterized in that, Conduct a trial dynamic compaction replacement test on the first test area according to the formulated basic parameters for dynamic compaction replacement construction. The specific test steps include: Lay 1.0m of filler at the position of the point compaction points, and perform dynamic compaction operations with a rammer. During the dynamic compaction process, when the depth of the compaction pit exceeds 1.0m, evenly lay filler into the compaction pit with a thickness of 0.5m. After laying the filler, continue the dynamic compaction operation until the average compaction settlement of the last two blows is less than 50mm, then stop the dynamic compaction operation. If the average compaction settlement of the last two blows is still greater than 50mm during dynamic compaction, continue to add filler step by step for dynamic compaction.

6. The dynamic compaction replacement method for treating soft soil subgrade according to claim 5, wherein, The diameter of the rammer is 2m, the point compaction energy is 2000KN·m, the full compaction energy is 1000KN·m, there are 2 passes of point compaction, 4 - 6 blows per pass, 1 pass of full compaction, 3 - 5 blows per pass. Record the compaction settlement and the number of compaction blows during the compaction process. After the compaction is completed, use the plate load test method to measure the bearing capacity of the subgrade.

7. The dynamic compaction replacement method for soft soil subgrade treatment according to claim 1, wherein, Four monitoring points are set in the first test area to monitor the first test area and monitor the post-construction settlement. The monitoring points are divided into monitoring point 1, monitoring point 2, monitoring point 3, and monitoring point 4. Monitoring point 1 is set on the ground surface, monitoring point 2 is set 0.25 meters below the ground surface, monitoring point 3 is set 0.5 meters below the ground surface, and monitoring point 2 is set 0.75 meters below the ground surface.

8. The dynamic compaction replacement method for soft soil subgrade treatment according to claim 1, wherein, The test results are sorted out and theoretically analyzed to establish the quantitative laws among different replacement materials, replacement pile spacings, and the dynamic compaction replacement treatment effects, including: S51: Sort out and summarize the test results, including the foundation bearing capacity and rammed earth moisture content after the construction of the first test area, the second test area, and the third test area; S52: Quantify and statistically analyze the test results with the replacement materials and replacement pile spacings. The statistical analysis includes variance analysis and regression analysis; obtain the relationship between the dynamic compaction replacement treatment effects and different replacement material replacement piles.

9. The dynamic compaction replacement method for treating soft soil subgrade according to claim 1, wherein, According to the quantitative laws, the optimal pile spacing and replacement filler are imported into the numerical simulation software through numerical simulation to establish a dynamic compaction replacement model, verify the relevant test results, and establish relevant empirical parameters according to the verification results, including: S61: Analyze according to the quantitative laws, determine the optimal replacement filler and pile spacing, and conduct simulations for different situations respectively; S62: Select a suitable numerical simulation software to establish a model; S63: Set the parameters of the model. The parameters include the property parameters of the foundation soil, the property parameters of the replacement layer material, the replacement pile spacing parameters, the rammer standard, and the tamping force; S64: Conduct numerical simulation calculations according to the set parameters of the model and obtain the simulation calculation results; compare the simulation results with the test data, and correct and optimize the simulation results; S65: Based on the completed numerical simulation results, establish a corresponding empirical parameter model. The empirical parameter model includes the relationship between the dynamic compaction replacement treatment effects and different replacement materials and replacement pile spacings, the improvement range of the foundation bearing capacity after dynamic compaction treatment, and the relationship between the tamping energy and the soil plane response; S66: Regularly inspect and optimize the established empirical parameter model to ensure its effectiveness and reliability, and continuously improve and adjust the model in combination with practical experience to provide a scientific basis for actual construction.

10. A device for treating soft soil subgrade by dynamic compaction replacement. The device includes a data collector, a memory, and a processor. A duplex communication connection is carried out between the output end of the data collector and the input end of the processor, and a duplex communication connection is carried out between the output end of the processor and the input end of the memory. When the processor executes the treatment of the soft soil subgrade by dynamic compaction replacement, it realizes the steps of the method described in any one of claims 1-9.

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