Method and system for determining solution subsidence coefficient of salinized soil foundation based on immersion load test

Abstract

The invention provides a method and system for determining a saline soil foundation melt sinking coefficient based on a soaking load test. The method comprises the steps that the soaking load test is conducted on a target site, the total settlement amount is measured, and the additional stress influence depth and the soaking depth are determined; layering a soil layer in the target site, and determining a compression modulus and a layering thickness; based on the compression modulus and the layering thickness, determining the additional stress deformation of the substrate and the water immersion humidification deformation of the soil body; removing the base additional stress deformation amount and the soil body soaking and humidifying deformation amount from the total settlement amount to obtain the melt sinking deformation amount; and determining the solution subsidence coefficient of the salinized soil foundation based on the solution subsidence deformation and the immersion depth. According to the method, the melt sinking deformation and other deformation components are precisely separated, so that the determined melt sinking coefficient is more suitable for engineering practice, a saline soil foundation treatment scheme can be effectively optimized, the engineering cost is reduced, meanwhile, the test period is remarkably shortened, the test cost input is reduced, and the method is suitable for foundation engineering investigation and design of saline soil distribution areas such as northwest arid regions.

Description

Technical Field

[0001] This invention belongs to the field of special soil engineering geological property analysis and evaluation technology, specifically to the method and system for determining the solution collapse coefficient of saline soil foundation based on immersion load test. Background Technology

[0002] Saline soil is widely distributed in my country. It has high strength in its natural state, but when it is soaked in water, the salt dissolves and causes the soil to collapse and deform, resulting in a significant decrease in strength and bearing capacity, which poses a serious threat to engineering construction.

[0003] When evaluating the degree of saline soil collapse and the collapse grade of saline soil foundation, the "Code for Design of Buildings in Saline Soil Areas" (GB / T 50942-2014) does not distinguish between two different working conditions: self-weight collapse and non-self-weight collapse. Instead, it normalizes both conditions and adopts a single evaluation standard. However, when conducting saline soil collapse tests, the method of loading before immersion is used to determine the collapse amount of the sample or test site. This method takes into account the self-wetting deformation of the saline soil sample or saline soil foundation under specific immersion pressure and the compression deformation caused by additional stress. As a result, the measured collapse coefficient and the converted collapse amount are often too large, leading to a conservative classification of the degree of saline soil collapse and the collapse grade of saline soil foundation. Meanwhile, since a differentiated system of solutions for evaluating and treating the collapsibility of saline soil has not yet been established, conventional methods often employ ground treatment schemes such as replacement cushion layer method, dynamic compaction method, compaction pile or pile foundation, etc. All of these schemes need to be designed in conjunction with the collapsibility level and lower limit of collapsibility. Therefore, further improving the accuracy of the collapsibility coefficient measurement is crucial to improving the reliability and economy of the ground treatment scheme. The collapsibility coefficient is calculated by obtaining the immersion depth and total collapsibility volume through immersion load test. Although this method can calculate the collapsibility coefficient, it does not distinguish between different working conditions of self-weight and non-self-weight, and it takes into account the soil's own wetting deformation and additional stress deformation after immersion. This results in a large deviation between the determined collapsibility coefficient and the actual value. In addition, this method also has limitations such as complex test process, long construction period and high cost. Summary of the Invention

[0004] To address the problem of large deviations between the solution collapse coefficient determined by existing immersion load tests and the actual value, this invention provides a method and system for determining the solution collapse coefficient of saline soil foundations based on immersion load tests.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a method for determining the solution collapse coefficient of saline soil foundation based on immersion load tests, comprising: An immersion load test is conducted at the target site to determine the total settlement of the target site under the preset test load and to determine the additional stress influence depth and immersion depth of the target site after the immersion load test is completed. In the target site, the soil layers within the range of the additional stress influence depth and the immersion depth are divided into layers, and the compression modulus and layer thickness of each soil layer are determined. The additional stress deformation of the base and the soil immersion and wetting deformation under the test load are determined based on the compression modulus and the layer thickness. The solution collapse deformation is obtained by subtracting the additional stress deformation of the base and the soil immersion and wetting deformation from the total settlement. The average solution collapse coefficient is determined based on the solution collapse deformation and the immersion depth, thus obtaining the solution collapse coefficient of the saline soil foundation.

[0006] Preferably, the step of conducting an immersion load test at the target site to determine the total settlement of the target site under a preset test load includes: Obtain the engineering geological profile of the target site to clarify the stratigraphic stratification. Based on the geological stratification, the immersion test location is calibrated. An immersion load test device with the test load set is built at the immersion test location. The test load is applied to the immersion test location. After the deformation stabilizes, the current height data of the pressure plate in the immersion load test device is collected to obtain the first location data. An immersion test is conducted at the immersion test location, and the height data of the pressure plate is collected after the immersion test to obtain the second settlement location data; The total settlement is calculated based on the first location data and the second settlement location data. Preferably, the process of determining the depth of influence of the additional stress on the target site after the immersion load test is as follows:

[0007] in, For the depth of influence of additional stress, The width of the foundation at the location of the immersion test; The process of determining the immersion depth of the target site after the immersion load test is as follows:

[0008] in, This refers to the immersion depth. The saturated permeability coefficient, To generalize the matrix suction at the infiltration site, The saturated volumetric water content of the soil. The initial moisture content, This represents the initial height at which water infiltrates.

[0009] Preferably, in the target site, the soil layers within the depth of influence of additional stress and the immersion depth are separately layered, and the compression modulus and layer thickness of each soil layer are determined, including: The soil within the depth of additional stress influence in the target site is divided into multiple layers from the base to the depth of additional stress influence, and the soil within the water immersion depth range in the target site is divided into multiple layers from the base to the water immersion depth, resulting in soil layers with additional stress influence depth and soil layers with water immersion depth. The compression modulus and layer thickness of each soil layer are determined, where the compression modulus includes the compression modulus under saturated conditions and the compression modulus under natural conditions.

[0010] Preferably, determining the additional stress deformation of the substrate under the test load based on the compressive modulus and the delamination thickness includes: The additional stress deformation of each soil layer is calculated based on the compression modulus and the layer thickness of the additional stress-affected soil layer. The additional stress deformation of the base is then calculated using a one-dimensional compression model of the additional stress soil layer based on the additional stress deformation of each soil layer at the additional stress-affected depth. The immersion wetting deformation of each immersion depth soil layer is calculated based on the compression modulus under saturated conditions, the compression modulus under natural conditions, and the layer thickness of the immersion depth layer. The immersion wetting deformation of the soil body is then calculated using a wetting deformation model based on the immersion wetting deformation of each immersion depth soil layer.

[0011] Preferably, the process of calculating the additional stress deformation of the base layer based on the layered additional stress deformation of each layered soil layer at the depth of influence of additional stress using a one-dimensional compression model of the additional stress soil layer is as follows:

[0012] in, For the first The additional stress affects the additional stress deformation of deeply layered soil layers. To act on the first The additional stress affects the average additional stress of the deeply layered soil. For the first Additional stress affects the layer thickness of deeply stratified soil layers. For the first An additional stress affects the compressive modulus of a deeply layered soil layer under saturated conditions. The number of soil layers at different depths is determined by the effect of additional stress. The amount of stress deformation applied to the base; The process of calculating the water immersion deformation of the soil body based on the immersion deformation model for each stratified soil layer at each immersion depth is as follows:

[0013] in, For the first The amount of immersion and wetting deformation of each stratified soil layer at each immersion depth. To act on the first Average additional stress of soil layers at each immersion depth For the first The thickness of each layer of soil at each immersion depth For the first Compression modulus of stratified soil layers at a given immersion depth under saturated conditions The number of soil layers based on the depth of immersion. For the first Compression modulus of stratified soil at a given depth under natural conditions This represents the deformation of the soil due to water immersion and wetting.

[0014] Preferably, the additional stress deformation of the base layer is also calculated using a first standard model based on the additional stress deformation of each layered soil layer at the depth of influence of the additional stress. The process of calculating the additional stress deformation of the base using the first standard model is as follows:

[0015] in, For the first The additional stress affects the additional stress deformation of deeply layered soil layers. Empirical coefficients for settlement calculation. The number of soil layers at different depths is determined by the effect of additional stress. For the first The additional stress affects the bottom depth of the stratified soil layer. For the first The additional stress affects the bottom depth of the stratified soil layer. To act on the first The average additional stress coefficient of the deep-layered soil is affected by the additional stress. To act on the first The average additional stress coefficient of the deep-layered soil is affected by the additional stress. For testing load.

[0016] Preferably, the water immersion deformation of each soil layer is further calculated using a second standard model to obtain the water immersion deformation of the soil. The process of calculating the soil immersion and wetting deformation using the second standard model is as follows:

[0017] in, For the first The amount of immersion and wetting deformation of each stratified soil layer at each immersion depth. Empirical coefficients for settlement calculation. The number of soil layers based on the depth of immersion. For the first The depth of the bottom layer of each immersion depth soil layer For the first The depth of the bottom layer of each immersion depth soil layer To act on the first The average additional stress coefficient of each immersion depth soil layer To act on the first The average additional stress coefficient of each immersion depth soil layer To test the load, For the first Compression modulus of a stratified soil layer at a given immersion depth under natural conditions.

[0018] Preferably, the process of determining the average solution sinking coefficient based on the solution sinking deformation and immersion depth is as follows:

[0019] in, This represents the solution collapse coefficient of saline soil foundations. This refers to the immersion depth. This represents the amount of solution deformation.

[0020] This invention proposes a system for determining the solution collapse coefficient of saline soil foundations, used to implement the aforementioned method for determining the solution collapse coefficient of saline soil foundations based on immersion load tests. The system is characterized by comprising: The test processing module is configured to conduct a water immersion load test at the target site, determine the total settlement of the target site under a preset test load, and determine the water immersion depth and the depth of influence of additional stress at the target site after the water immersion load test is completed. The stratification module is configured to stratify the soil layers within the range of the depth of influence of additional stress and the depth of immersion in the target site, and to determine the compression modulus and layer thickness of each soil layer. The first calculation and processing module is configured to determine the additional stress deformation of the base and the soil immersion and wetting deformation under the test load based on the compression modulus and the layer thickness. The second calculation and processing module is configured to remove the additional stress deformation of the base and the soil immersion and wetting deformation from the total settlement to obtain the solution deformation. The coefficient determination module is configured to determine the average solution collapse coefficient based on the solution collapse deformation amount and the immersion depth, thereby obtaining the solution collapse coefficient of the saline soil foundation. The output module is configured to output the solution collapse coefficient of saline soil foundation.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes a method for determining the solution collapse coefficient of saline soil foundations based on immersion load tests. This method obtains basic data such as total settlement and immersion depth from on-site immersion load tests at the target site. Simultaneously, it layers the soil within a specific range and determines the compression modulus and thickness of each layer. This fully considers the layered characteristics of the soil and actual on-site conditions, avoiding a disconnect between theoretical assumptions and engineering practice. By accurately calculating each deformation component through layered parameters, it reduces empirical estimation errors, making the final average solution collapse coefficient data more reliable. The total settlement is decomposed into the additional stress deformation of the base, the soil immersion and wetting deformation, and the solution collapse deformation, eliminating irrelevant deformation interference. This makes the calculation of solution collapse deformation more closely reflect the actual soil stress and immersion coupling effect, significantly improving the accuracy of the solution collapse coefficient test for saline soil foundations, reducing the deviation between the solution collapse coefficient and the actual value, avoiding over- or under-treatment caused by deviations in the solution collapse coefficient, and reducing engineering costs and safety risks.

[0022] Furthermore, this method ensures that the evaluation results can truly reflect the characteristics of the site foundation by obtaining the stratification information; it divides the soil in a specific range into layers based on the stratification information to ensure reasonable stratification; it sets up equipment to match the test load and applies the load consistent with the actual project to achieve the realism of the working condition simulation; after the deformation stabilizes, it collects the first position data to eliminate the interference of instantaneous deformation and obtain the stable benchmark state of the foundation under the load.

[0023] Furthermore, this method divides a specific area of ​​the target site into layers from the base to the depth of additional stress influence and the immersion depth, respectively, to obtain the compression modulus and layer thickness of each soil layer in its natural and saturated states. By refining the layers, it achieves precise control over the areas affected by additional stress and immersion, avoiding deformation calculation deviations caused by overall assessment. At the same time, the compression modulus of the two states fully reflects the differences in soil mechanical properties before and after immersion, and the layer thickness provides basic data support for subsequent deformation calculations, ensuring that the parameter system is complete and consistent with reality.

[0024] Furthermore, this method calculates the additional stress deformation of each soil layer based on the compression modulus under saturated conditions and the layer thickness, and calculates the immersion and wetting deformation of each soil layer based on the compression modulus under saturated conditions, the compression modulus under natural conditions, and the layer thickness. The additional stress deformation of the foundation and the immersion and wetting deformation of the soil at the target site are obtained by the layer summation method. By focusing on the deformation characteristics of saturated soil under load, the additional stress of the foundation and the deformation caused by immersion and wetting are accurately separated, and other factors are excluded from interference, providing a quantitative basis for assessing the solubility of saline soil foundations. Attached Figure Description

[0025] Figure 1 This is a flowchart illustrating the method for determining the solution collapse coefficient of saline soil foundation based on immersion load test proposed in this invention. Figure 2 This is a schematic diagram illustrating the principle of the method for determining the solution collapse coefficient of saline soil foundation based on immersion load test proposed in this invention. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] This invention proposes a method for determining the solution collapse coefficient of saline soil foundations based on immersion load tests, such as... Figure 1 As shown, it includes the following steps: A water immersion load test is conducted at the target site to determine the total settlement of the target site under the preset test load, as well as the additional stress influence depth and immersion depth of the target site after the water immersion load test. Within the target site, the soil layers within the range of the additional stress influence depth and immersion depth are divided into layers, and the compression modulus and layer thickness of the soil in each layer are determined. Based on the compression modulus and layer thickness, the additional stress deformation of the base and the immersion wetting deformation of the soil under the test load are determined. The solution collapse deformation is obtained by subtracting the additional stress deformation of the base and the immersion wetting deformation of the soil from the total settlement. Based on the solution collapse deformation and immersion depth, the average solution collapse coefficient is determined, thus obtaining the solution collapse coefficient of the saline soil foundation. This method conducts in-situ tests at the target site to directly obtain key data such as total settlement and immersion depth. By combining layered compression modulus and thickness parameters, it further improves the pertinence of the calculation process, reduces errors caused by empirical estimation, takes into account the effects of soil layering characteristics and immersion depth, avoids the disconnect between theoretical assumptions and field conditions, significantly improves the accuracy of testing the solution collapse coefficient of saline soil foundations, and reduces the deviation between the solution collapse coefficient and the actual value.

[0029] In this embodiment, an immersion load test is conducted at the target site to determine the total settlement of the target site under a preset test load; including: Obtain the engineering geological profile of the target site to clarify the stratigraphic stratification, including the material composition, particle size distribution, homogeneity, and stratification characteristics of the soil layers at different depths. The location for the immersion test is determined based on the stratigraphic stratification, and the immersion load test equipment is set up at the test location, such as... Figure 2As shown, the test load P is set in the immersion load test equipment, where the preset test load P is the same as the actual engineering load. After the test load P is applied at the immersion test location and the deformation stabilizes, the current height data of the bearing plate in the immersion load test equipment is collected to obtain the first position data. Immersion is continued to simulate the wetting effect of water on the foundation soil, and the height data of the bearing plate is collected after the immersion test to obtain the second settlement position data. The total settlement is calculated based on the first position data and the second settlement position data. This method applies loads and collects data based on the actual geological environment and relies on immersion load testing equipment to ensure that the test loads and immersion conditions are consistent with the actual engineering situation. By comparing location data and recording soil thickness, it accurately obtains parameters such as the total settlement and immersion depth of the foundation under immersion conditions, thereby improving the accuracy of determining the solution collapse coefficient.

[0030] In this embodiment, the soil layers within the depth of influence of additional stress and the immersion depth in the target site are divided into layers, and the compression modulus and layer thickness of each soil layer are determined, including: The soil within the depth of additional stress influence in the target site is divided sequentially from the base to the depth of additional stress influence. Multiple layers of soil with varying depths of additional stress influence were obtained, dividing the soil within the immersion depth range of the target site into layers from the base to the immersion depth. The layers were divided into multiple soil layers with different immersion depths.

[0031] Obtain the layer thickness of each layer of soil at the depth of influence of each additional stress. , The thickness of each stratified soil layer at each immersion depth , and the compression modulus of each soil layer, wherein the compression modulus includes the compression modulus under saturation. Compressive modulus in its natural state Compression modulus under saturated conditions Compressive modulus in its natural state All of these can be obtained through field immersion load tests, indoor compression tests, and empirical parameters. Among them, when calculating the additional stress deformation of the base, the layer thickness of multiple soil layers is considered. The sum equals the depth of influence of the additional stress When calculating the soil immersion and wetting deformation, the layer thickness of multiple soil layers is considered. The sum equals the immersion depth h .

[0032] Determining the immersion depth of the target site after the immersion load test includes: The immersion depth in the immersion load test was determined based on the Green-Ampt infiltration model, by collecting the saturated volumetric water content of the soil at the immersion test location. Initial moisture content Through the saturated volumetric water content of the soil Initial moisture content and the starting height of water infiltration Calculate the immersion depth ; The specific calculation process is as follows:

[0033] in, The saturated permeability coefficient, To generalize the matrix suction at the infiltration site, The saturated volumetric water content of the soil. The initial moisture content, This represents the initial height at which water infiltrates.

[0034] To ensure data accuracy, the location can also be determined at the target site through drilling or pitting; specifically, it can be determined by observing the location of the phreatic line, or by collecting the saturated volumetric water content of the soil at the immersion test location. Initial moisture content Confirmed by comparison.

[0035] Test load caused The stress is determined based on the Boussinesq elasticity theory. When a vertical concentrated force is applied to the surface, the stress caused at any point below the foundation is:

[0036]

[0037] in, Let be the stress at any point in the soil. The soil compression deformation coefficient is denoted as . Let be the depth of any point below the base. The horizontal projected distance between any point and the point where the test load is applied is given.

[0038] According to the Boussinesq elastic theory, the soil compression deformation caused by additional stress decreases with increasing depth. After a certain depth, the additional stress compression deformation caused by the test load on the soil approaches zero. Therefore, the depth of influence of additional stress can be determined. Depth of influence of additional stress The calculation process is as follows:

[0039] in, For the depth of influence of additional stress, This refers to the width of the foundation at the location of the immersion test.

[0040] The additional stress deformation of the base and the soil immersion and wetting deformation under the test load are determined based on the compression modulus and the layer thickness, including: Based on the compressive modulus under saturation The effect of additional stress on the layer thickness of deep stratified soil layers Calculate the layer deformation of each layer of soil at each depth affected by the additional stress. The additional stress deformation of the base layer is calculated based on the deformation of the base layer of the layered soil at the depth of each additional stress influence. Among them, the compressive modulus under saturation is utilized. The effect of additional stress on the layer thickness of deep stratified soil layers The additional stress and deformation of the foundation were calculated using a one-dimensional soil compression model. Additional stress deformation of the base It can also be calculated using the first standard model.

[0041] The additional stress and deformation of the foundation were calculated using a one-dimensional soil compression model. The process is as follows:

[0042] in, For the first Additional stress affects the deformation of the subgrade of deeply layered soil layers. To act on the first The additional stress affects the average additional stress of the deeply layered soil. For the first Additional stress affects the layer thickness of deeply stratified soil layers. For the first An additional stress affects the compressive modulus of a deeply layered soil layer under saturated conditions. This represents the number of soil layers affected by the additional stress at different depths. The average additional stress affecting each soil layer at different depths is also included. Due to additional stress The average value is obtained by integrating along the depth direction from the top to the bottom of the soil layer.

[0043] The additional stress deformation of the base was calculated using the first standard model. The process is as follows:

[0044] in, This represents the deformation of each layer of the foundation. Empirical coefficients for settlement calculation. The number of soil layers at different depths is determined by the effect of additional stress. As the base to the first The additional stress affects the bottom depth of the stratified soil layer. As the base to the first The additional stress affects the bottom depth of the stratified soil layer. To act on the first The average additional stress coefficient of the deep-layered soil is affected by the additional stress. To act on the first The average additional stress coefficient of the deep-layered soil is affected by the additional stress. For testing load.

[0045] Based on the compressive modulus under saturation Compression modulus in its natural state and the thickness of the stratified soil layers based on water immersion depth Calculate the layer deformation of each soil layer at each immersion depth, and then calculate the soil immersion and wetting deformation based on the layer deformation of each soil layer at each immersion depth. Soil deformation due to water immersion It can be calculated using its own wetting deformation model, or it can be calculated using the second standard model; The soil immersion deformation was calculated using a self-wetting deformation model. The process is as follows:

[0046] in, For the first The amount of immersion and wetting deformation of each stratified soil layer at each immersion depth. To act on the first Average additional stress of soil layers at each immersion depth For the first The thickness of each layer of soil at each immersion depth For the first Compression modulus of stratified soil layers at a given immersion depth under saturated conditions The number of soil layers based on the depth of immersion. For the first Compression modulus of stratified soil at a given depth under natural conditions This refers to the deformation of the soil due to water immersion and wetting. The soil immersion and wetting deformation was calculated using the second standard model. The process is as follows:

[0047] in, For the first The amount of immersion and wetting deformation of each stratified soil layer at each immersion depth. Empirical coefficients for settlement calculation. The number of soil layers based on the depth of immersion. For the first The depth of the bottom layer of each immersion depth soil layer For the first The depth of the bottom layer of each immersion depth soil layer To act on the first The average additional stress coefficient of each immersion depth soil layer To act on the first The average additional stress coefficient of each immersion depth soil layer To test the load, For the first Compression modulus of a stratified soil layer at a given immersion depth under natural conditions.

[0048] Obtain the total settlement Additional stress deformation of the base and soil immersion and wetting deformation From the total settlement Remove additional stress deformation of the substrate and soil immersion and wetting deformation The amount of solution depression deformation was obtained. ; Solution deformation The calculation process is as follows:

[0049] in, This represents the total settlement. The amount of additional stress deformation on the base. This represents the deformation of the soil due to water immersion and wetting.

[0050] The average solution collapse coefficient was determined based on the amount of solution collapse deformation and the immersion depth, thus obtaining the solution collapse coefficient of saline soil foundation. The specific calculation process is as follows:

[0051] in, This represents the solution collapse coefficient of saline soil foundations. This refers to the immersion depth. This represents the amount of solution deformation.

[0052] This invention also proposes a system for determining the solution collapse coefficient of saline soil foundation, which is used to implement the above-mentioned method for determining the solution collapse coefficient of saline soil foundation based on immersion load test. The system includes a test processing module, a layered processing module, a first calculation processing module, a second calculation processing module, a coefficient determination module, and an output module. The test processing module is configured to conduct a water immersion load test at the target site, determine the total settlement of the target site under a preset test load, and determine the water immersion depth and the depth of additional stress influence of the target site after the water immersion load test is completed. The stratification module is configured to stratify the soil layers within the range of the depth of influence of additional stress and the depth of immersion in the target site, and to determine the compression modulus and layer thickness of each soil layer. The first calculation and processing module is configured to determine the additional stress deformation of the base and the soil immersion and wetting deformation under the test load based on the compression modulus and the layer thickness. The second calculation and processing module is configured to remove the additional stress deformation of the base and the soil immersion and wetting deformation from the total settlement to obtain the solution deformation. The coefficient determination module is configured to determine the average solution collapse coefficient based on the solution collapse deformation amount and the immersion depth, thereby obtaining the solution collapse coefficient of the saline soil foundation. The output module is configured to output the solution collapse coefficient of saline soil foundation.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for determining the solution collapse coefficient of saline soil foundation based on immersion load test, characterized in that, include: An immersion load test is conducted at the target site to determine the total settlement of the target site under the preset test load and to determine the additional stress influence depth and immersion depth of the target site after the immersion load test is completed. In the target site, the soil layers within the depth of influence of additional stress and the immersion depth are divided into layers, and the compression modulus and layer thickness of each soil layer are determined. The additional stress deformation of the base and the soil immersion and wetting deformation under the test load are determined based on the compression modulus and the layer thickness. The solution collapse deformation is obtained by subtracting the additional stress deformation of the base and the soil immersion and wetting deformation from the total settlement. The average solution collapse coefficient is determined based on the solution collapse deformation and the immersion depth, thus obtaining the solution collapse coefficient of the saline soil foundation.

2. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 1, characterized in that, The step of conducting an immersion load test at the target site to determine the total settlement of the target site under a preset test load includes: Obtain the engineering geological profile of the target site to clarify the stratigraphic stratification. Based on the geological stratification, the immersion test location is calibrated. An immersion load test device with the test load set is built at the immersion test location. The test load is applied to the immersion test location. After the deformation stabilizes, the current height data of the pressure plate in the immersion load test device is collected to obtain the first location data. An immersion test is conducted at the immersion test location, and the height data of the pressure plate is collected after the immersion test to obtain the second settlement location data; The total settlement is calculated based on the first location data and the second settlement location data.

3. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 1, characterized in that, In the target site, the soil layers within the depth of influence of additional stress and the immersion depth are divided into layers, and the compression modulus and layer thickness of each soil layer are determined, including: The soil within the depth of additional stress influence in the target site is divided into multiple layers from the base to the depth of additional stress influence, and the soil within the water immersion depth range in the target site is divided into multiple layers from the base to the water immersion depth, resulting in soil layers with additional stress influence depth and soil layers with water immersion depth. The compression modulus and layer thickness of each soil layer are determined, where the compression modulus includes the compression modulus under saturated conditions and the compression modulus under natural conditions.

4. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 3, characterized in that, The process of determining the depth of influence of additional stress on the target site after the immersion load test is as follows: in, For the depth of influence of additional stress, The width of the foundation at the location of the immersion test; The process of determining the immersion depth of the target site after the immersion load test is as follows: in, This refers to the immersion depth. The saturated permeability coefficient, To generalize the matrix suction at the infiltration site, The saturated volumetric water content of the soil. The initial moisture content, This represents the initial height at which water infiltrates.

5. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 3, characterized in that, Determining the additional stress deformation of the substrate under the test load based on the compressive modulus and the delamination thickness includes: The additional stress deformation of each soil layer is calculated based on the compression modulus and the layer thickness of the additional stress-affected soil layer. The additional stress deformation of the base is then calculated using a one-dimensional compression model of the additional stress soil layer based on the additional stress deformation of each soil layer at the additional stress-affected soil layer. The immersion wetting deformation of each immersion depth soil layer is calculated based on the compression modulus under saturated conditions, the compression modulus under natural conditions, and the layer thickness of the immersion depth layer. The immersion wetting deformation of the soil body is then calculated using a wetting deformation model based on the immersion wetting deformation of each immersion depth soil layer.

6. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 5, characterized in that, The process of calculating the additional stress deformation of the base layer based on the layered additional stress deformation of each layered soil layer at the depth of influence of the additional stress is as follows: in, For the first The additional stress affects the additional stress deformation of deeply layered soil layers. To act on the first The additional stress affects the average additional stress of the deeply layered soil. For the first Additional stress affects the layer thickness of deeply stratified soil layers. For the first An additional stress affects the compressive modulus of a deeply layered soil layer under saturated conditions. The number of soil layers at different depths is determined by the effect of additional stress. The amount of stress deformation applied to the base; The process of calculating the water immersion deformation of the soil body based on the immersion deformation model for each stratified soil layer at each immersion depth is as follows: in, For the first The amount of immersion and wetting deformation of each stratified soil layer at each immersion depth. To act on the first Average additional stress of soil layers at each immersion depth For the first The thickness of each layer of soil at each immersion depth For the first Compression modulus of stratified soil layers at a given immersion depth under saturated conditions The number of soil layers based on the depth of immersion. For the first Compression modulus of stratified soil at a given depth under natural conditions This represents the deformation of the soil due to water immersion and wetting.

7. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 5, characterized in that, The additional stress deformation of the base layer is also calculated using the first standard model based on the layered additional stress deformation of each layered soil layer at the depth of influence of the additional stress. The process of calculating the additional stress deformation of the base using the first standard model is as follows: in, For the first The additional stress affects the additional stress deformation of deeply layered soil layers. Empirical coefficients for settlement calculation. The number of soil layers at different depths is determined by the effect of additional stress. For the first The additional stress affects the bottom depth of the stratified soil layer. For the first The additional stress affects the bottom depth of the stratified soil layer. To act on the first The average additional stress coefficient of the deep-layered soil is affected by the additional stress. To act on the first The average additional stress coefficient of the deep-layered soil is affected by the additional stress. For testing load.

8. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 5, characterized in that, The water immersion and wetting deformation of each soil layer is also calculated using the second standard model to obtain the water immersion and wetting deformation of the soil. The process of calculating the soil immersion and wetting deformation using the second standard model is as follows: in, For the first The amount of immersion and wetting deformation of each stratified soil layer at each immersion depth. Empirical coefficients for settlement calculation. The number of soil layers based on the depth of immersion. For the first The depth of the bottom layer of each immersion depth soil layer For the first The depth of the bottom layer of each immersion depth soil layer To act on the first The average additional stress coefficient of each immersion depth soil layer To act on the first The average additional stress coefficient of each immersion depth soil layer To test the load, For the first Compression modulus of a stratified soil layer at a given immersion depth under natural conditions.

9. The method for determining the solution collapse coefficient of saline soil foundation based on immersion load test according to claim 1, characterized in that, The process of determining the average solution collapse coefficient based on the solution collapse deformation and immersion depth is as follows: in, This represents the solution collapse coefficient of saline soil foundations. This refers to the immersion depth. This represents the amount of solution trap deformation.

10. A system for determining the solution collapse coefficient of saline soil foundation, used to implement the method for determining the solution collapse coefficient of saline soil foundation based on immersion load test as described in any one of claims 1 to 9, characterized in that, include: The test processing module is configured to conduct a water immersion load test at the target site, determine the total settlement of the target site under a preset test load, and determine the water immersion depth and the depth of influence of additional stress at the target site after the water immersion load test is completed. The stratification module is configured to stratify the soil layers within the range of the depth of influence of additional stress and the depth of immersion in the target site, and to determine the compression modulus and layer thickness of each soil layer. The first calculation and processing module is configured to determine the additional stress deformation of the base and the soil immersion and wetting deformation under the test load based on the compression modulus and the layer thickness. The second calculation and processing module is configured to remove the additional stress deformation of the base and the soil immersion and wetting deformation from the total settlement to obtain the solution deformation. The coefficient determination module is configured to determine the average solution collapse coefficient based on the solution collapse deformation amount and the immersion depth, thereby obtaining the solution collapse coefficient of the saline soil foundation. The output module is configured to output the solution collapse coefficient of saline soil foundation.

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