Collapsible loess foundation deformation analysis system and method based on variable monitoring

Abstract

The invention discloses a collapsible loess foundation deformation analysis system and method based on variable monitoring, and relates to the technical field of collapsible loess foundation deformation analys.The collapsible loess foundation deformation analysis method comprises the steps that a structural attenuation model is established, and the structural attenuation model establishes the relation between a structure degree index and compression structure yield stress; calculating a self-weight collapsibility coefficient of the loess under the saturated self-weight action by utilizing a compression curve and a structural attenuation model; monitoring a deformation correlation variable of the collapsible loess area in the foundation; and evaluating the self-weight collapsing deformation of the collapsible loess area in the foundation based on the deformation correlation variable and the self-weight collapsing coefficient. According to the method, the structure degree indexes are used for quantitatively describing the structure of the loess, and the indexes comprise the material composition of the loess and the structure characteristics of the loess of different deposition years. The relation between the yield stress of the structure and collapsing deformation is established, wherein the relation between the yield stress of the compression structure of the loess and the structure degree of the compression structure of the loess and the relation between the void ratio change and the compression stress in the loess compression deformation process are established.

Description

Technical Field

[0001] The invention relates to the technical field of deformation analysis of collapsible loess foundation, and in particular to a system and method for analyzing deformation of collapsible loess foundation based on variable monitoring. Background Art

[0002] Collapsible loess is a special geological body. When it is soaked by water under a certain pressure, its structure is quickly destroyed, and significant collapsible deformation occurs, and its strength is reduced. This characteristic has a significant impact on engineering construction, especially on the deformation or cracking of buildings, the subsidence of highway subgrades or the collapse of slopes.

[0003] The geological conditions in collapsible loess areas are complex, the soil is easily wetted by water, and the bearing capacity of the foundation is relatively low, which brings challenges to engineering construction and structural stability. The current geotechnical engineering survey and foundation treatment methods have certain limitations when facing these complex situations.

[0004] Insufficient research on collapsible deformation and soil pressure: There is insufficient research on the collapsible characteristics of deep loess foundation soil during waterlogging and the law of soil pressure changes. For example, a study of a site showed that the maximum collapsible subsidence of a deep loess site was about 150 cm, but the surface outside the 10m waterlogging range basically did not sink.

[0005] Influence of loess structure: The structure of loess has an important influence on its collapsibility. The structural decay of loess, whether due to loading or immersion, will lead to changes in its structural yield stress, thus affecting the collapsible deformation. Summary of the invention

[0006] In order to solve the above technical problems of deformation analysis of collapsible loess foundation, the present invention provides a system and method for deformation analysis of collapsible loess foundation based on variable monitoring. The following technical solutions are adopted: The deformation analysis method of collapsible loess foundation based on variable monitoring includes the following steps: Step 1, collecting loess samples from the collapsible loess area in the foundation, conducting physical and mechanical property tests, and obtaining the material composition and structural characteristics of the loess samples; Step 2, determining the structural index according to the compression test; Step 3, determining the compression curves under different moisture contents through compression tests; Step 4, testing the compressive structural yield stress of loess under different loading conditions; Step 5, establishing a structural attenuation model, the structural attenuation model establishes the relationship between the structural index and the yield stress of the compressive structure; Step 6, using the compression curve and structural attenuation model, calculate the self-weight collapsibility coefficient of loess under the action of saturated self-weight; Step 7, monitoring the deformation-related variables of the collapsible loess area in the foundation; Step 8, evaluating the self-weight collapsible deformation of the collapsible loess area in the foundation based on the deformation associated variables and the self-weight collapsible coefficient.

[0007] Alternatively, the structural index can be determined by compression testing. The structural index is calculated by: ; in is a construct indicator, is the compressive structural yield stress of loess before it is soaked in water during the compression test. It is the yield stress of the compressive structure after being soaked in water during the compression test.

[0008] By adopting the above technical solution, the structural index is used to quantitatively describe the structure of loess, which includes the material composition of the soil and the structural characteristics of loess in different depositional ages.

[0009] The relationship between structural yield stress and collapsible deformation: Establish the relationship between the compressive structural yield stress of loess and its texture, as well as the relationship between the change in porosity and compressive stress during the compression deformation of loess.

[0010] Based on the relationship between void ratio change and compressive stress, the self-weight collapsibility coefficient of loess under saturated self-weight is calculated to evaluate the self-weight collapsibility deformation of the site. Deformation-related variables are added to the assessment calculation of collapsible deformation. Deformation-related variables usually include ground settlement observation, groundwater level changes, soil deformation monitoring, etc., to improve the accuracy of deformation assessment of collapsible loess foundation.

[0011] Among them, the actual surface settlement amount can be obtained through ground settlement observation data; Monitoring the changes in groundwater levels can assess the impact of moisture on the collapsibility of loess; Use inclinometers, stratified settlement meters and other equipment to monitor the stratified deformation of soil.

[0012] Optionally, in step 5, the relationship between the structural index and the compressive structural yield stress is as follows: ; in is the compressive structural yield stress, k is the proportionality coefficient, It is a construct indicator.

[0013] Alternatively, the formula for calculating the self-weight collapsibility coefficient of loess under saturated self-weight is: ; in is the deadweight collapsibility coefficient under deadweight; is the change in the construct index; is the correlation coefficient of loess properties, reflecting the sensitivity of loess structural yield stress to the change of structural index; is the initial compressive structural yield stress, is the initial structural yield stress.

[0014] By adopting the above technical solution, the initial compressive structural yield stress refers to the critical stress value at which the structure of loess begins to yield when it begins to bear load. In other words, when the externally applied stress is less than this value, the structure of the loess will not be significantly damaged, and the strength and stability of the loess can be maintained; when the externally applied stress is equal to or greater than this value, the structure of the loess begins to yield, and the strength and stability of the soil will decrease accordingly. This stress value reflects the structural strength of the loess in an undisturbed state.

[0015] Initial structural yield stress can sometimes be used interchangeably with initial compressive structural yield stress, but in some literature, it may specifically refer to the structural yield stress of loess in its natural state, that is, the stress value of structural yield caused by the loess' own gravity or other internal factors without any external load. This concept emphasizes the structural stability of loess under its own gravity.

[0016] In the study of loess collapsibility, these two parameters are important indicators for distinguishing the structural yield characteristics of loess under different stress states. The collapsibility of loess refers to the property that the structure of loess is rapidly destroyed and produces significant settlement under the action of its own weight or external load and water. These two parameters in the calculation formula of the deadweight collapsibility coefficient can help evaluate the degree of collapsibility of loess under the action of saturated deadweight, and thus provide a scientific basis for engineering design and construction. Through these parameters, we can better understand the structural changes of loess under different stress states, so as to take corresponding engineering measures to prevent or reduce the harm caused by collapsibility.

[0017] Optionally, the deformation-related variables include actual surface settlement, groundwater level change and soil layer deformation.

[0018] Alternatively, the core formula of the structural decay model is: ; in is the construction index at time t, is the initial structure index, is the attenuation coefficient, is the current effective stress, is the initial effective stress, is the moisture content influence coefficient, is the current moisture content, and e is the base of the natural logarithm.

[0019] By adopting the above technical solution, on-site monitoring indicators are added to the evaluation calculation formula of collapsible deformation to improve the accuracy of the evaluation.

[0020] Alternatively, the self-weight collapsible deformation evaluation formula for collapsible loess areas is: ; in is the collapsibility deformation, It is the initial shrinkage deformation obtained based on indoor tests and theoretical calculations. is the difference adjustment coefficient between the ground subsidence observation and theoretical calculation results, is the adjustment coefficient for the effect of groundwater level change on collapsible deformation, is the weight coefficient of the deformation monitoring result of the i-th layer of soil, n is the number of layers of soil in the collapsible loess area, is the actual surface subsidence, is the groundwater level change, is the layered deformation of the i-th soil layer.

[0021] Optional, preliminary collapsibility based on indoor tests and theoretical calculations The calculation formula is: ; in is the inverse of the initial void ratio, It is the coefficient of self-weight collapsibility under the action of self-weight.

[0022] By adopting the above technical solution, the difference adjustment coefficient , Adjustment coefficient of the effect of groundwater level change on collapsible deformation , weight coefficient of the i-th layer soil deformation monitoring result The following steps are required to determine: Analyze the differences between field monitoring data and theoretical calculation results.

[0023] The adjustment coefficient is determined by inversion using field data.

[0024] The accuracy of the model is verified by comparing the corrected calculation results with the actual observation data.

[0025] In this way, the deformation of collapsible loess foundation can be evaluated more accurately, thus providing a more reliable basis for engineering practice.

[0026] A deformation analysis system for collapsible loess foundation based on variable monitoring, comprising a loess sample sampling device, a standard penetration test device, a static penetration test device, a ground radar, a piezometer, a triaxial shear tester, a consolidation tester, a compression tester and a soil analysis module, wherein the loess sample sampling device is used to obtain soil samples, the standard penetration test device is used to evaluate the engineering properties of the soil layer, the static penetration test device penetrates the soil layer through a probe to measure the mechanical properties of the soil layer, the ground radar is used to detect underground structures and soil layer distribution, the piezometer is used to measure the pore water pressure in the soil layer, the triaxial shear tester is used to measure the shear strength and stress-strain relationship of the soil sample, the consolidation tester is used to measure the consolidation characteristics of the soil sample, and the compression tester is used to measure the compressibility of the soil sample; The soil analysis module includes a memory and a data analysis computer. The memory is respectively connected to the standard penetration test equipment, the static penetration test equipment, the ground radar, the piezometer, the triaxial shear tester, the consolidation tester and the compression tester. The memory stores an analysis program designed by the collapsible loess foundation deformation analysis method based on variable monitoring. The data analysis computer is connected to the memory and runs the analysis program to output the self-weight collapsible deformation results of the collapsible loess area.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects: The present invention can provide a system and method for analyzing deformation of collapsible loess foundation based on variable monitoring, and use structural indicators to quantitatively describe the structural properties of loess. The indicators include the material composition of the soil and the structural characteristics of loess in different depositional ages.

[0028] The relationship between structural yield stress and collapsible deformation: Establish the relationship between the compressive structural yield stress of loess and its texture, as well as the relationship between the change in porosity and compressive stress during the compression deformation of loess.

[0029] Based on the relationship between void ratio change and compressive stress, the self-weight collapsibility coefficient of loess under saturated self-weight is calculated to evaluate the self-weight collapsibility deformation of the site. In the assessment and calculation of collapsible deformation, deformation-related variables such as ground settlement observation, groundwater level changes, and soil deformation monitoring are added to improve the accuracy of the assessment of collapsible loess foundation deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic flow chart of the deformation analysis method of collapsible loess foundation based on variable monitoring of the present invention; Figure 2 It is a schematic diagram of the connection principle of the electrical components of the collapsible loess foundation deformation analysis system based on variable monitoring of the present invention.

[0031] Explanation of the accompanying symbols: 1. Loess sample sampling device; 2. Standard penetration test equipment; 3. Static penetration equipment; 4. Ground radar; 5. Pore pressure gauge; 6. Triaxial shear tester; 7. Consolidation tester; 8. Compression tester; 91. Memory; 92. Data analysis computer. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] The embodiment of the present invention discloses a system and method for analyzing deformation of collapsible loess foundation based on variable monitoring.

[0034] Reference Figure 1 and Figure 2 Embodiment 1, a method for analyzing deformation of collapsible loess foundation based on variable monitoring, comprising the following steps: Step 1, collecting loess samples from the collapsible loess area in the foundation, conducting physical and mechanical property tests, and obtaining the material composition and structural characteristics of the loess samples; Step 2, determining the structural index according to the compression test; Step 3, determining the compression curves under different moisture contents through compression tests; Step 4, testing the compressive structural yield stress of loess under different loading conditions; Step 5, establishing a structural attenuation model, the structural attenuation model establishes the relationship between the structural index and the yield stress of the compressive structure; Step 6, using the compression curve and structural attenuation model, calculate the self-weight collapsibility coefficient of loess under the action of saturated self-weight; Step 7, monitoring the deformation-related variables of the collapsible loess area in the foundation; Step 8, evaluating the self-weight collapsible deformation of the collapsible loess area in the foundation based on the deformation associated variables and the self-weight collapsible coefficient.

[0035] Example 2: The structural index can be determined by compression test. The calculation formula of the structural index is: ; in is a construct indicator, is the compressive structural yield stress of loess before it is soaked in water during the compression test. It is the yield stress of the compressive structure after being soaked in water during the compression test.

[0036] The structural index is used to quantitatively describe the structure of loess, which includes the material composition of the soil and the structural characteristics of loess in different depositional ages.

[0037] The relationship between structural yield stress and collapsible deformation: Establish the relationship between the compressive structural yield stress of loess and its texture, as well as the relationship between the change in porosity and compressive stress during the compression deformation of loess.

[0038] Based on the relationship between void ratio change and compressive stress, the self-weight collapsibility coefficient of loess under saturated self-weight is calculated to evaluate the self-weight collapsibility deformation of the site. Deformation-related variables are added to the assessment calculation of collapsible deformation. Deformation-related variables usually include ground settlement observation, groundwater level changes, soil deformation monitoring, etc., to improve the accuracy of deformation assessment of collapsible loess foundation.

[0039] Among them, the actual surface settlement amount can be obtained through ground settlement observation data; Monitoring the changes in groundwater levels can assess the impact of moisture on the collapsibility of loess; Use inclinometers, stratified settlement meters and other equipment to monitor the stratified deformation of soil.

[0040] In Example 3, in step 5, the relationship between the structural index and the yield stress of the compression structure is as follows: ; in is the compressive structural yield stress, k is the proportionality coefficient, It is a construct indicator.

[0041] Example 4: The formula for calculating the self-weight collapsibility coefficient of loess under saturated self-weight is: ; in is the deadweight collapsibility coefficient under deadweight; is the change in the construct index; is the correlation coefficient of loess properties, reflecting the sensitivity of loess structural yield stress to the change of structural index; is the initial compressive structural yield stress, is the initial structural yield stress.

[0042] The initial compressive structural yield stress refers to the critical stress value at which the structure of loess begins to yield when it begins to bear load. In other words, when the externally applied stress is less than this value, the structure of the loess will not be significantly damaged, and the strength and stability of the loess can be maintained; when the externally applied stress is equal to or greater than this value, the structure of the loess begins to yield, and the strength and stability of the soil will decrease accordingly. This stress value reflects the structural strength of the loess in an undisturbed state.

[0043] Initial structural yield stress can sometimes be used interchangeably with initial compressive structural yield stress, but in some literature, it may specifically refer to the structural yield stress of loess in its natural state, that is, the stress value of structural yield caused by the loess' own gravity or other internal factors without any external load. This concept emphasizes the structural stability of loess under its own gravity.

[0044] The self-weight collapsible coefficient can help more accurately predict and analyze the deformation of collapsible loess foundations, thereby providing a scientific basis for engineering design and construction.

[0045] In Example 5, the deformation-related variables include the actual surface settlement, the groundwater level change and the stratified deformation of the soil.

[0046] Example 6, the core formula of the structural attenuation model is: ; in is the construction index at time t, is the initial structure index, is the attenuation coefficient, is the current effective stress, is the initial effective stress, is the moisture content influence coefficient, is the current moisture content, and e is the base of the natural logarithm.

[0047] Add field monitoring indicators to the assessment calculation formula for collapsible deformation to improve the accuracy of the assessment.

[0048] Example 7, the self-weight collapsible deformation evaluation formula of collapsible loess area is: ; in is the collapsibility deformation, It is the initial shrinkage deformation obtained based on indoor tests and theoretical calculations. is the difference adjustment coefficient between the ground subsidence observation and theoretical calculation results, is the adjustment coefficient for the effect of groundwater level change on collapsible deformation, is the weight coefficient of the deformation monitoring result of the i-th layer of soil, n is the number of layers of soil in the collapsible loess area, is the actual surface subsidence, is the groundwater level change, is the layered deformation of the i-th soil layer.

[0049] Example 8: Preliminary collapsibility based on indoor tests and theoretical calculations The calculation formula is: ; in is the inverse of the initial void ratio, It is the coefficient of self-weight collapsibility under the action of self-weight.

[0050] Difference adjustment factor , Adjustment coefficient of the effect of groundwater level change on collapsible deformation , weight coefficient of the i-th layer soil deformation monitoring result The following steps are required to determine: Analyze the differences between field monitoring data and theoretical calculation results.

[0051] The adjustment coefficient is determined by inversion using field data.

[0052] The accuracy of the model is verified by comparing the corrected calculation results with the actual observation data.

[0053] In this way, the deformation of collapsible loess foundation can be evaluated more accurately, thus providing a more reliable basis for engineering practice.

[0054] Embodiment 9, a collapsible loess foundation deformation analysis system based on variable monitoring, comprising a loess sample sampling device 1, a standard penetration test device 2, a static penetration test device 3, a ground radar 4, a piezometer 5, a triaxial shear tester 6, a consolidation tester 7, a compression tester 8 and a soil analysis module, wherein the loess sample sampling device 1 is used to obtain soil samples, the standard penetration test device 2 is used to evaluate the engineering properties of the soil layer, the static penetration test device 3 penetrates the soil layer through a probe to determine the mechanical properties of the soil layer, the ground radar 4 is used to detect underground structures and soil layer distribution, the piezometer 5 is used to measure the pore water pressure in the soil layer, the triaxial shear tester 6 is used to determine the shear strength and stress-strain relationship of the soil sample, the consolidation tester 7 is used to determine the consolidation characteristics of the soil sample, and the compression tester 8 is used to determine the compressibility of the soil sample; The soil analysis module includes a memory 91 and a data analysis computer 92. The memory 91 is respectively connected to the standard penetration test equipment 2, the static penetration equipment 3, the ground radar 4, the piezometer 5, the triaxial shear tester 6, the consolidation tester 7 and the compression tester 8 for communication. The memory 91 stores an analysis program designed by the collapsible loess foundation deformation analysis method based on variable monitoring. The data analysis computer 92 is connected to the memory 91 for communication, and runs the analysis program to output the self-weight collapsible deformation results of the collapsible loess area.

[0055] The following specific implementation cases are provided to illustrate the implementation principle of the collapsible loess foundation deformation analysis system and method based on variable monitoring of the present invention: A city plans to build a new industrial park in a loess area. Since the unique collapsible nature of the loess area may have an adverse effect on the building, the project team needs to conduct a detailed deformation analysis of the foundation to ensure the safety of the building.

[0056] Site investigation and sampling: Drilling sampling: Use a rotary drill to drill holes in the planned construction area to obtain soil samples at different depths. The drilling depth should be below the expected foundation depth to ensure that all potentially affected soil layers are covered.

[0057] Standard Penetration Test (SPT): During the drilling process, an SPT test is conducted to record the number of hammer blows for every 30 cm of penetration to evaluate the engineering properties of the soil layer.

[0058] Cone Penetration Test (CPT): Use CPT equipment to perform continuous penetration and record the probe resistance to obtain the mechanical parameters of the soil layer.

[0059] Triaxial shear test: The obtained soil samples are saturated and then tested on a triaxial shear tester to obtain the shear strength parameters of the soil samples.

[0060] Consolidation test: Different levels of pressure are applied to the soil sample on the consolidation tester to measure the consolidation coefficient and compressibility of the soil sample.

[0061] Collapse test: Use a collapsible test device to add water and humidify the soil sample, determine the collapsible coefficient, and evaluate the self-weight collapsible deformation of the collapsible loess area in the foundation based on the deformation-related variables and the self-weight collapsible coefficient.

[0062] Data Processing: Field test data collected using a data logger are entered into a computer.

[0063] Use professional software to process data, such as inversion analysis of mechanical parameters of soil layers.

[0064] Model building: Build geological and mechanical models based on laboratory test results and field data.

[0065] Finite element analysis software is used to perform numerical simulation of foundation deformation.

[0066] Deformation analysis results: The analysis results show that under saturated conditions, the loess layer has significant collapsibility, which may lead to uneven settlement of the foundation.

[0067] Foundation treatment suggestions: Based on the analysis results, it is recommended to adopt engineering measures such as pre-compression reinforcement, replacement of cushion layer or use of pile foundation to reduce the impact of collapsibility.

[0068] Construction monitoring: During the construction process, equipment such as levels and inclinometers are used to monitor foundation deformation to ensure construction safety.

[0069] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A deformation analysis method for collapsible loess foundation based on variable monitoring, characterized in that: The following steps are involved: Step 1, collecting loess samples from the collapsible loess area in the foundation, conducting physical and mechanical property tests, and obtaining the material composition and structural characteristics of the loess samples; Step 2, determining the structural index according to the compression test; Step 3, determining the compression curves under different moisture contents through compression tests; Step 4, testing the compressive structural yield stress of loess under different loading conditions; Step 5, establishing a structural attenuation model, the structural attenuation model establishes the relationship between the structural index and the yield stress of the compressive structure; Step 6, using the compression curve and structural attenuation model, calculate the self-weight collapsibility coefficient of loess under the action of saturated self-weight; Step 7, monitoring the deformation-related variables of the collapsible loess area in the foundation; Step 8, evaluating the self-weight collapsible deformation of the collapsible loess area in the foundation based on the deformation associated variables and the self-weight collapsible coefficient.

2. The method for analyzing deformation of collapsible loess foundation based on variable monitoring according to claim 1 is characterized in that: The structural index is determined by compression test, and the calculation formula of the structural index is: ； in is a construct indicator, is the compressive structural yield stress of loess before it is soaked in water during the compression test. It is the yield stress of the compressive structure after being soaked in water during the compression test.

3. The method for analyzing deformation of collapsible loess foundation based on variable monitoring according to claim 2 is characterized in that: In step 5, the relationship between the structural index and the compressive structural yield stress is as follows: ； in is the compressive structural yield stress, k is the proportionality coefficient, It is a construct indicator.

4. The method for analyzing deformation of collapsible loess foundation based on variable monitoring according to claim 3 is characterized in that: The formula for calculating the self-weight collapsibility coefficient of loess under saturated self-weight is: ； in is the deadweight collapsibility coefficient under deadweight; is the change in the construct index; is the correlation coefficient of loess properties, reflecting the sensitivity of loess structural yield stress to the change of structural index; is the initial compressive structural yield stress, is the initial structural yield stress.

5. The method for analyzing deformation of collapsible loess foundation based on variable monitoring according to claim 4 is characterized in that: Deformation-related variables include actual surface settlement, groundwater level change and soil stratification deformation.

6. The method for analyzing deformation of collapsible loess foundation based on variable monitoring according to claim 5 is characterized in that: The core formula of the structural decay model is: ； in is the construction index at time t, is the initial structure index, is the attenuation coefficient, is the current effective stress, is the initial effective stress, is the moisture content influence coefficient, is the current moisture content, and e is the base of the natural logarithm.

7. The method for analyzing deformation of collapsible loess foundation based on variable monitoring according to claim 6 is characterized in that: The self-weight collapsible deformation evaluation formula for collapsible loess areas is: ； in is the collapsibility deformation, It is the initial shrinkage deformation obtained based on indoor tests and theoretical calculations. is the difference adjustment coefficient between the ground subsidence observation and theoretical calculation results, is the adjustment coefficient for the effect of groundwater level change on collapsible deformation, is the weight coefficient of the deformation monitoring result of the i-th layer of soil, n is the number of layers of soil in the collapsible loess area, is the actual surface subsidence, is the groundwater level change, is the layered deformation of the i-th soil layer.

8. The method for analyzing deformation of collapsible loess foundation based on variable monitoring according to claim 7, characterized in that: Preliminary collapsible deformation based on indoor tests and theoretical calculations The calculation formula is: ; in is the inverse of the initial void ratio, It is the self-weight collapsibility coefficient under the action of self-weight.

9. The collapsible loess foundation deformation analysis system based on variable monitoring is characterized by: The invention comprises a loess sample sampling device (1), a standard penetration test device (2), a static penetration test device (3), a ground radar (4), a piezometer (5), a triaxial shear tester (6), a consolidation tester (7), a compression tester (8) and a soil analysis module, wherein the loess sample sampling device (1) is used to obtain soil samples, the standard penetration test device (2) is used to evaluate the engineering properties of a soil layer, the static penetration test device (3) penetrates a probe into a soil layer to measure the mechanical properties of the soil layer, the ground radar (4) is used to detect underground structures and soil layer distribution, the piezometer (5) is used to measure the pore water pressure in the soil layer, the triaxial shear tester (6) is used to measure the shear strength and stress-strain relationship of a soil sample, the consolidation tester (7) is used to measure the consolidation characteristics of a soil sample, and the compression tester (8) is used to measure the compressibility of a soil sample; The soil analysis module comprises a memory (91) and a data analysis computer (92), wherein the memory (91) is respectively connected to the standard penetration test equipment (2), the static penetration test equipment (3), the ground radar (4), the piezometer (5), the triaxial shear tester (6), the consolidation tester (7) and the compression tester (8), and the memory (91) stores an analysis program designed by the collapsible loess foundation deformation analysis method based on variable monitoring as described in claim 8, and the data analysis computer (92) is connected to the memory (91) to run the analysis program to output the self-weight collapsible deformation result of the collapsible loess area.

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