A method and system for calculating the collapse deformation of unsaturated soil

Abstract

This application provides a method and system for calculating the collapsibility deformation of unsaturated soil. The method includes the following steps: obtaining structural parameters to quantify the influence of saturation changes on soil structure sensitivity; introducing the structural parameters into the volume change equation of unsaturated soil to construct a calculation model for the collapsibility deformation of unsaturated soil; and calculating the soil deformation amount based on the constructed calculation model. This method for calculating the collapsibility deformation of unsaturated soil effectively simulates the wet-induced collapse behavior of unsaturated soil controlled by water content by introducing a saturation-related structural parameter to reflect the sensitivity of soil structure to changes in saturation. This provides assistance in predicting foundation settlement, assessing slope stability, and solving engineering geological problems.

Description

Technical Field

[0001] This application relates to the technical field of unsaturated soil collapsibility deformation research, specifically to the calculation method and system for unsaturated soil collapsibility deformation. Background Technology

[0002] Influenced by factors such as rainfall and groundwater activity, soils in nature are often partially saturated with water, existing in an unsaturated state. For loosely structured soils, such as loess, the mechanical response in this unsaturated state is particularly complex. When subjected to changes in saturation or matrix suction, the volume, shear strength, and hydraulic properties of soils like loess undergo significant changes. In engineering geology, this significant volumetric deformation caused by increased saturation is defined as collapsible deformation, a direct factor leading to numerous geological and engineering problems, including slope instability, foundation settlement, and underground structural failure. The causes of soil collapsible deformation are multifaceted, including the dissolution of soluble soil components, weakening of capillary water film and interparticle bridging, rupture of interparticle contact cementation, and the resulting reorganization and destruction of the microstructure.

[0003] Specifically, the mechanism of soil collapsibility is the breakdown of the cementation between particles with large pore structures under the influence of water immersion, leading to the destruction of the large pore structure and a decrease in soil porosity. These complex interactions significantly alter the macroscopic mechanical behavior of the soil, thus increasing the challenge of describing the mechanical behavior of unsaturated soil using mathematical methods. Accurately depicting the impact of saturation changes on soil structure is crucial for simulating the collapsible deformation of unsaturated soils.

[0004] In soil mechanics, the volume change equation is a mathematical model describing the volume change of soil under external loads, and it forms the basis for constructing soil constitutive models. For saturated soil, a common equation form is the linear relationship between the specific volume (υ) and the logarithm of the mean effective stress (lnp′) of normally consolidated soil:

[0005] υ=N-λlnp′

[0006] In the formula, λ is the compressibility coefficient, and N is the specific volume υ when lnp′=0. When the volume change equation for saturated soil is extended to unsaturated soil, the volume change of the soil is also significantly affected by matric suction. In this case, the effective stress should include two components: net average stress and matric suction, i.e.:

[0007]

[0008] in, p is the net average stress. Sλ is a function of matrix suction, or a function of matrix suction and saturation. If the effective stress truly controls the soil volume effectively, then v should remain constant at a constant p', and the parameters N and λ should be independent of matrix suction. However, in most models, λ is usually assumed to be a function of s. Soil compression paths show that when λ is a function of s, the slope of the normal compression line decreases with increasing matrix suction, i.e., λ(s) < λ(0).

[0009] However, existing experimental data do not fully support this theory. For example, in Gallipoli et al.'s study, λ increases with increasing s, and in Burton et al.'s study, the asymptotes of the normal compression line under different matrix suction conditions are approximately parallel to the normal compression line under saturation conditions. Therefore, it is unreasonable to continue to consider λ as a function of s. This patent will provide a new method for calculating the collapsible deformation volume of unsaturated soil. This method continues to consider N and λ as constants and reflects the sensitivity of soil structure to changes in saturation by introducing a function of matrix suction and saturation. Summary of the Invention

[0010] This application provides a method and system for calculating the collapsible deformation of unsaturated soil, which can solve the technical problem in the prior art that it is unreasonable to calculate the collapsible deformation of unsaturated soil by assuming the compression coefficient as a function of the matrix suction.

[0011] Firstly, this application provides a method for calculating the soil deformation during unsaturated soil collapsibility, comprising the following steps:

[0012] Obtain structural parameters to quantify the impact of saturation changes on soil structure sensitivity;

[0013] Structural parameters are introduced into the volume change equation of unsaturated soil to construct a calculation model for the collapsibility deformation of unsaturated soil;

[0014] Based on the constructed calculation model for unsaturated soil collapsibility deformation, the soil deformation amount of unsaturated soil collapsibility deformation is calculated.

[0015] In conjunction with the first aspect, in one embodiment, the functional relationship between the structural parameters and saturation in obtaining the structural parameters used to quantify the impact of saturation changes on soil structure sensitivity is as shown in the following equation:

[0016] δ=exp(<αln(1-S r )+β>)

[0017] In the formula, δ is the structural parameter, and S r α represents saturation, β represents the first material parameter, and β represents the second material parameter, both determined through curve fitting; <> represents Macaulay brackets.

[0018] In conjunction with the first aspect, in one embodiment, the structural parameters are introduced into the volume change equation of unsaturated soil to construct a calculation model for the collapsible deformation of unsaturated soil, as shown in the following equation:

[0019] lnυ=N * -λ * lnp′+λ * lnδ

[0020] In the formula, υ is the specific volume, p′ is the average effective stress, and λ is the average effective stress. * Let N be the slope of the compression curve in the lnv-lnp′ plane. * Let lnp′ and lnδ be the intercepts of the curve when both lnp′ and lnδ are 0.

[0021] The calculation model for the collapsibility deformation of unsaturated soil is rewritten in incremental form, as shown in the following equation:

[0022]

[0023] In conjunction with the first aspect, in one embodiment, after introducing structural parameters into the volume change equation of unsaturated soil and constructing a calculation model for the collapsible deformation of unsaturated soil, the following steps are also included:

[0024] Based on the experimental results, an idealized normal compression line for unsaturated soil was extracted;

[0025] Based on the obtained idealized normal compression line of unsaturated soil, the effectiveness of the compression line slope of the calculation model for collapsible deformation of unsaturated soil is verified.

[0026] In conjunction with the first aspect, in one embodiment, after introducing structural parameters into the volume change equation of unsaturated soil and constructing a calculation model for the collapsible deformation of unsaturated soil, the following steps are also included:

[0027] Based on the constructed calculation model of unsaturated soil collapsibility deformation, multiple sets of isotropic compression tests were simulated to obtain the model response results with different parameter variations;

[0028] Based on the model response results with different parameter variations, the simulation capability of the unsaturated soil collapsibility deformation calculation model is verified.

[0029] In conjunction with the first aspect, in one embodiment, the multiple sets of isotropic compression tests include soil compression curves under different matrix suction levels, soil compression curves under different first material parameters, and soil compression curves under different second material parameters.

[0030] In conjunction with the first aspect, in one embodiment, after introducing structural parameters into the volume change equation of unsaturated soil and constructing a calculation model for the collapsible deformation of unsaturated soil, the following steps are also included:

[0031] Isotropic compression tests were conducted on unsaturated silty clay to obtain the results of the first compression test.

[0032] A compression-wetting-compression test was conducted on unsaturated soil to obtain the results of the second compression test.

[0033] The accuracy of the calculation model for the collapsible deformation of unsaturated soil was verified based on the results of the first and second compression tests.

[0034] Secondly, this application provides a calculation system for the collapsibility deformation of unsaturated soil, including:

[0035] The structural parameter acquisition module is used to acquire structural parameters for quantifying the impact of saturation changes on soil structure sensitivity.

[0036] The model building module is connected to the structural parameter acquisition model and is used to introduce structural parameters into the volume change equation of unsaturated soil to build a calculation model for the collapsible deformation of unsaturated soil.

[0037] The soil deformation calculation module is communicatively connected to the model construction module and is used to calculate and obtain the soil deformation of unsaturated soil collapsibility based on the constructed unsaturated soil collapsibility deformation calculation model.

[0038] In conjunction with the second aspect, in one implementation, it further includes:

[0039] The normal compression line acquisition unit is used to acquire the idealized normal compression line of unsaturated soil.

[0040] The compression line slope verification unit is communicatively connected to the normal compression line acquisition unit and is used to verify the effectiveness of the compression line slope of the unsaturated soil deformation calculation model based on the acquired idealized unsaturated soil normal compression line.

[0041] In conjunction with the second aspect, in one implementation, it further includes:

[0042] The parameter response result acquisition unit is used to simulate multiple sets of isotropic compression tests based on the constructed calculation model of unsaturated soil collapsibility deformation, and obtain the model response results with different parameter variations.

[0043] The collapsibility characteristic simulation verification unit is communicatively connected to the parameter response result acquisition unit, and is used to verify the soil collapsibility characteristic simulation capability of the unsaturated soil collapsibility deformation calculation model based on the model response results of different parameter changes.

[0044] The beneficial effects of the technical solutions provided in this application include at least the following:

[0045] The method for calculating the collapsible deformation of unsaturated soil provided in this application reflects the sensitivity of soil structure to changes in saturation by introducing a saturation-related structural parameter. It effectively simulates the wet-induced collapse behavior of unsaturated soil controlled by water content, and provides assistance in predicting foundation settlement, assessing slope stability, and solving engineering geological problems. Attached Figure Description

[0046] Figure 1 This is a flowchart of the method for calculating the collapsible deformation of unsaturated soil provided in the embodiments of this application;

[0047] Figure 2 This is an idealized diagram of normal compression of unsaturated soil.

[0048] Figure 3 The model response diagram provided in this application is a variation of matrix suction.

[0049] Figure 4 (a) is a model response diagram with respect to the first material parameter provided in an embodiment of this application; Figure 4 (b) is a model response diagram showing the variation of the second material parameter provided in an embodiment of this application;

[0050] Figure 5 (a) is a graph showing the logarithmic relationship between specific volume and vertical stress in the compression test of unsaturated silty clay with a matrix suction of 100 kPa and different compaction degrees provided in the embodiments of this application. Figure 5 (b) is a graph showing the logarithmic relationship between specific volume and vertical stress in the compression test of unsaturated silty clay with a matrix suction of 200 kPa and different compaction degrees provided in the embodiments of this application. Figure 5 (c) is a graph showing the logarithmic relationship between specific volume and vertical stress in the compression test of unsaturated silty clay with a matrix suction of 300 kPa and different compaction degrees provided in the embodiments of this application. Figure 5 (d) is a graph showing the logarithmic relationship between specific volume and vertical stress in the compression test of unsaturated silty clay with a matrix suction of 400 kPa and different compaction degrees provided in the embodiments of this application.

[0051] Figure 6 The graph shows the change in void ratio of unsaturated soil under different effective stresses of matrix suction during the compression-wetting-compression test provided in this application embodiment. Detailed Implementation

[0052] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0053] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0054] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0055] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0056] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0057] First, some of the technical terms used in this application will be explained to help those skilled in the art understand this application.

[0058] NCL: Normal Compression Line.

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0060] Firstly, please refer to Figure 1 The method for calculating the collapsible deformation of unsaturated soil provided in this application includes the following steps:

[0061] Step S1: Construct a calculation model for the collapsibility deformation of unsaturated soil;

[0062] Step S3: Based on the constructed calculation model of unsaturated soil collapsibility deformation, calculate and obtain the soil deformation amount of unsaturated soil collapsibility deformation.

[0063] In one embodiment, step S1: constructing a calculation model for the collapsible deformation of unsaturated soil specifically includes the following steps:

[0064] Step S11: Apparent compression coefficient λ * and N * As a constant, a structural parameter is introduced to quantify the impact of saturation changes on soil structure sensitivity. Based on the analysis and reasoning of existing literature and experimental data, the functional relationship between the structural parameter and saturation is defined as follows:

[0065] δ=exp(<αln(1-S r )+β>)

[0066] In the formula, δ is the structural parameter; S r α represents saturation; α represents the first material parameter, and β represents the second material parameter, both determined through curve fitting; <> represents Macaulay brackets, which indicate the non-negative part of a value. When the value inside the brackets is positive or zero, the original value is taken; when the value inside the brackets is negative, zero is taken.

[0067] This application provides a structural parameter directly related to saturation. By introducing this saturation-related structural parameter, the changes in soil structure under different saturation levels can be accurately described. The introduction of the structural parameter enables the model to capture the wet-induced collapse phenomenon and its influence on soil compressibility, thereby explaining the changes in the NCL slope under different suction conditions, effectively simulating the wet-induced collapse phenomenon, reflecting the sensitivity of soil structure to changes in saturation, and well explaining the different changes in the NCL slope under different suction conditions and the NCL slope under saturation conditions observed in compression tests.

[0068] In one embodiment, step S12: Introducing structural parameters into the volume change equation of unsaturated soil to construct a calculation model for the collapsible deformation of unsaturated soil, including the following steps:

[0069] Step S121: Introduce the structural parameter δ to the volume change equation of unsaturated soil, and construct the calculation model for the collapsible deformation of unsaturated soil as shown in the following equation:

[0070] lnv = N * -λ * lnp′+λ * lnδ

[0071] In the formula, υ is the specific volume, p′ is the average effective stress, and λ is the average effective stress. * Let N be the slope of the compression curve in the lnδ-lnp′ plane. * Let lnp′ and lnδ be the intercepts of the curve when both lnp′ and lnδ are 0.

[0072] Step S122: Rewrite the volume change equation of unsaturated soil after introducing structural parameters into incremental form, and construct the incremental form calculation model of unsaturated soil collapsibility deformation, as shown in the following equation:

[0073]

[0074] In the formula, υ is the specific volume, p′ is the average effective stress, and S r For saturation, λ * Let be the slope of the compression curve in the lnυ-lnp′ plane.

[0075] In the above calculation model for the collapsibility deformation of unsaturated soil, Part of it is soil deformation caused by stress changes. Part of it is the soil deformation caused by changes in saturation.

[0076] The method for calculating the collapsible deformation of unsaturated soil provided in this application reflects the sensitivity of soil structure to changes in saturation by introducing a saturation-related structural parameter. It effectively simulates wet-induced collapse controlled by water content and can well explain the different changes in the slope of the normal compression line under different matrix suction and the slope of the normal compression line under saturation conditions observed in compression tests.

[0077] This application provides a novel volume change equation based on effective stress and soil structural properties. The compressibility of soil exhibits a nonlinear change under constant suction conditions. By combining stress and saturation, it can better reflect the actual behavior of soil under different conditions, improve the accuracy and reliability of calculations, better explain the nonlinear changes in soil compressibility under unsaturated conditions, accurately capture this nonlinear behavior, and provide assistance in predicting foundation settlement, assessing slope stability, and solving engineering geological problems.

[0078] This application provides a novel volume change equation based on effective stress and soil structural properties. By capturing these changes through saturation alterations, it provides accurate descriptions and predictions. This equation is applicable to describing the behavior of various unsaturated soils, including those under wet-dry cycles. Wet-dry cycles significantly affect soil deformation characteristics, laying a solid foundation for establishing constitutive models of unsaturated soils. This enables the models to be effectively applied under various practical engineering conditions, more accurately reflecting the deformation characteristics of soils under different water content conditions, and more realistically describing soil behavior under wet-dry cycles. This provides a basis for the subsequent construction of constitutive models of unsaturated soils.

[0079] The method for calculating the collapsible deformation of unsaturated soil provided in this application yields a volume change equation that forms the basis for establishing soil constitutive relations. This equation accurately reflects the deformation characteristics of soil under different water content conditions and more realistically describes the behavior of soil under wet-dry cycles. The equation structure is simple and can provide strong support for the subsequent construction of constitutive models of unsaturated soil.

[0080] In one embodiment, after constructing the calculation model for the collapsible deformation of unsaturated soil, the following steps are also included:

[0081] Step S2: Perform multi-dimensional verification operations on the constructed unsaturated soil collapsibility deformation calculation model to verify the effectiveness of the compression line slope, the simulation capability of soil collapsibility characteristics, and the calculation accuracy, so as to obtain an unsaturated soil collapsibility deformation calculation model with practical application value.

[0082] In one embodiment, step S2 includes steps S2A, S2B, and S2C.

[0083] In one embodiment, step S2A: verifying the slope validity of the calculation model for unsaturated soil collapsibility deformation specifically includes the following steps:

[0084] Based on the experimental results, an idealized normal compression line for unsaturated soil was extracted;

[0085] Based on the obtained idealized normal compression line of unsaturated soil, the effectiveness of the compression line slope of the calculation model for collapsible deformation of unsaturated soil is verified.

[0086] In one specific embodiment, step S2A: verifying the slope validity of the calculation model for the collapsible deformation of unsaturated soil is implemented as follows:

[0087] Obtain stress variation data and soil mass change data for saturated soil, as well as stress variation data and soil mass change data for unsaturated soil.

[0088] like Figure 2As shown, the blue dashed line represents the normal compression line of saturated soil, while the black dashed and solid lines represent the normal compression line during the transition stage and the actual trajectory of unsaturated soil under constant matric suction, respectively. When the soil transitions from a saturated to an unsaturated state, the increase in effective stress causes the normal compression line to move from the position shown by the blue dashed line to the position shown by the black dashed line (marked as I). For the normal compression line of unsaturated soil under constant matric suction, the increase in external stress (dp') causes the soil pores to be compressed, thereby increasing the saturation (dS). r >0). As saturation changes, the normal compression line moves from position I to position III in the diagram. In the lnυ-lnp′ flat space, the actual state of the soil moves from the point marked by curve I (initial state) to the point marked by curve III (state after stress and saturation changes). Connecting these points with a solid black line forms the actual trajectory of the unsaturated soil normal compression line, i.e., the idealized unsaturated soil normal compression line obtained from unsaturated soil compression tests.

[0089] Depend on Figure 2 It can be seen that the slope of the actual trajectory of a normal compression line is determined by the effective stress p' and the degree of saturation S. r The combined control allows for a good explanation of the difference in the asymptotic slope of the normal compression line under different matrix suction conditions compared to the slope of the normal compression line under saturation conditions observed in the experiment.

[0090] In one embodiment, step S2B: by focusing on the influence of effective stress and structural parameters on matrix suction, the first material parameter, and the first material parameter, the simulation capability of the unsaturated soil collapsibility deformation calculation model is verified, specifically including the following steps:

[0091] Based on the constructed calculation model of unsaturated soil collapsibility deformation, multiple sets of isotropic compression tests were simulated to obtain the model response results with different parameter variations;

[0092] Based on the model response results with different parameter variations, the simulation capability of the unsaturated soil collapsibility deformation calculation model is verified.

[0093] In one specific embodiment, step S2B: by focusing on the influence of effective stress and structural parameters on matrix suction, the first material parameter, and the second material parameter, the ability of the calculation model for unsaturated soil collapsibility deformation to simulate soil collapsibility characteristics is verified, which is achieved as follows:

[0094] Several sets of isotropic compression simulation tests were conducted, focusing on the effects of effective stress and structural parameters on the soil collapsibility characteristics, namely the effects of matrix suction s, the first material parameter α, and the second material parameter β.

[0095] like Figure 3The figure shows the compression curves of unsaturated soil with matrix suction s ranging from 0 to 400 kPa. Under different matrix suction levels, the normal compression lines intersect in the plane (the intersection point is shown as a black dot), and the curve corresponding to low matrix suction is located to the right of the intersection point below the curve of high matrix suction. This indicates that the method provided in this application effectively simulates the collapsible characteristic of unsaturated soil under saturation control.

[0096] Figure 4 (a) and Figure 4 In (b), the normal compression lines are for different first material parameters α and second material parameters β, respectively. The results show that by adjusting the values ​​of α and β to reduce the structural parameter δ, the normal compression line can be shifted to the left, indicating that the calculation method can effectively reflect structural damage and wet-induced deformation of the soil.

[0097] In one embodiment, step S2C: verifying the calculation accuracy of the calculation model for the collapsible deformation of unsaturated soil, specifically includes the following steps:

[0098] Isotropic compression tests were conducted on unsaturated silty clay to obtain the results of the first compression test.

[0099] A compression-wetting-compression test was conducted on unsaturated soil to obtain the results of the second compression test.

[0100] The accuracy of the calculation model for the collapsible deformation of unsaturated soil was verified based on the results of the first and second compression tests.

[0101] In one specific embodiment, step S2C: verifying the calculation accuracy of the calculation model for the collapsible deformation of unsaturated soil, is implemented as follows:

[0102] Simulations were performed on the isotropic compression test results of unsaturated silty clay and the compression-wetting-compression test results of unsaturated soil to verify the accuracy of the method. The results are as follows: Figure 5 and Figure 6 As shown, this indicates that the model simulation matches the experimental data well and can accurately reflect the collapsibility behavior and compression characteristics of unsaturated soil.

[0103] From steps S2A, S2B, and S2C, we can see that:

[0104] 1. This method directly reflects the soil wetting and collapse by introducing effective stress and structural parameters, and intuitively reveals the volume change characteristics of soil with saturation. It does not require involvement of complex mechanical and chemical mechanisms, and has the advantages of being simple, efficient and easy to integrate into the establishment of various constitutive models.

[0105] 2. The structural parameters proposed in this method are functions directly related to saturation and are used to describe the collapse behavior caused by changes in saturation. The proposed model well explains the different changes in the NCL slope under different suction forces observed in the compression test. It is of great significance for evaluating indoor compression tests and traditional soil mechanics problems such as foundation settlement and slope stability.

[0106] 3. This method is simple in form and can accurately capture the deformation characteristics of soil under different water content conditions and the behavior of soil under wet-dry cycle conditions. It can be applied to construct constitutive models of unsaturated soil, making the structure of the constructed unsaturated soil constitutive models simpler and effectively applicable to a variety of practical engineering conditions.

[0107] Secondly, this application provides a system for calculating the collapsibility deformation of unsaturated soil, including a structural parameter acquisition module, a model construction module, and a soil deformation calculation module. The structural parameter acquisition module acquires structural parameters used to quantify the influence of saturation changes on the soil's structural sensitivity. The model construction module is communicatively connected to the structural parameter acquisition model and is used to introduce the structural parameters into the volume change equation of unsaturated soil to construct a calculation model for the collapsibility deformation of unsaturated soil. The soil deformation calculation module is communicatively connected to the model construction module and is used to calculate the soil deformation amount of unsaturated soil based on the constructed calculation model.

[0108] The functions of each module in the above-mentioned unsaturated soil collapsibility deformation calculation system correspond to the steps in the above-mentioned unsaturated soil collapsibility deformation calculation method embodiment, and their functions and implementation processes will not be described in detail here.

[0109] In one embodiment, it further includes:

[0110] The normal compression line acquisition unit is used to acquire the idealized normal compression line of unsaturated soil.

[0111] The compression line slope verification unit is communicatively connected to the normal compression line acquisition unit and is used to verify the effectiveness of the compression line slope of the calculation model for unsaturated soil collapsibility based on the acquired idealized unsaturated soil normal compression line.

[0112] In one embodiment, it further includes:

[0113] The parameter response result acquisition unit is used to simulate multiple sets of isotropic compression tests based on the constructed calculation model of unsaturated soil collapsibility deformation, and obtain the model response results with different parameter variations.

[0114] The collapsibility characteristic simulation verification unit is communicatively connected to the parameter response result acquisition unit, and is used to verify the soil collapsibility characteristic simulation capability of the unsaturated soil collapsibility deformation calculation model based on the model response results of different parameter changes.

[0115] Thirdly, this application provides a device for calculating the collapsible deformation of unsaturated soil. The device for calculating the soil deformation of unsaturated soil can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0116] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting internal components of the unsaturated soil collapsibility deformation calculation device, as well as interfaces used for interconnecting the calculation device with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0117] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0118] The processor can be a general-purpose processor, which can call the unsaturated soil collapsibility deformation calculation program stored in the memory and execute the unsaturated soil collapsibility deformation calculation method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the unsaturated soil collapsibility deformation calculation program is called can refer to the various embodiments of the unsaturated soil collapsibility deformation calculation method of this application, and will not be repeated here.

[0119] Fourthly, embodiments of this application also provide a readable storage medium.

[0120] This application has a readable storage medium storing a program for calculating the collapsible deformation of unsaturated soil, wherein when the program is executed by a processor, it implements the steps of the above-described method for calculating the collapsible deformation of unsaturated soil.

[0121] The method implemented when the unsaturated soil collapsibility deformation calculation program is executed can be referred to in the various embodiments of the unsaturated soil collapsibility deformation calculation method of this application, and will not be repeated here.

[0122] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0123] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0124] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for calculating the collapsibility deformation of unsaturated soil, characterized in that, Includes the following steps: The structural parameters used to quantify the impact of saturation changes on soil structure sensitivity are obtained. The functional relationship between the structural parameters and saturation is shown in the following equation: In the formula, For structural parameters, For saturation, The first material parameter, This is the second material parameter. Macaulay brackets; By incorporating structural parameters into the volume change equation of unsaturated soil, a calculation model for the collapsible deformation of unsaturated soil is constructed, as shown in the following equation: In the formula, For specific volume, For the average effective stress, For the compression curve at Slope in the plane for and The intercept of the curve when both are 0; The calculation model for unsaturated soil deformation is rewritten in incremental form as shown in the following equation: ； Based on the constructed calculation model for unsaturated soil collapsibility deformation, the soil deformation amount of unsaturated soil collapsibility deformation is calculated.

2. The method for calculating the collapsibility deformation of unsaturated soil as described in claim 1, characterized in that, After introducing structural parameters into the volume change equation of unsaturated soil and constructing a calculation model for the collapsible deformation of unsaturated soil, the following steps are also included: Based on the experimental results, an idealized normal compression line for unsaturated soil was extracted; Based on the obtained idealized normal compression line of unsaturated soil, the effectiveness of the compression line slope of the unsaturated soil deformation calculation model is verified.

3. The method for calculating the collapsibility deformation of unsaturated soil as described in claim 1, characterized in that, After introducing structural parameters into the volume change equation of unsaturated soil and constructing a calculation model for the collapsible deformation of unsaturated soil, the following steps are also included: Based on the constructed calculation model of unsaturated soil collapsibility deformation, multiple sets of isotropic compression tests were simulated to obtain the model response results with different parameter variations; Based on the model response results with different parameter variations, the simulation capability of the unsaturated soil collapsibility deformation calculation model is verified.

4. The method for calculating the collapsibility deformation of unsaturated soil as described in claim 3, characterized in that, The multiple sets of isotropic compression tests include soil compression curves under different matrix suction levels, soil compression curves under different first material parameters, and soil compression curves under different second material parameters.

5. The method for calculating the collapsibility deformation of unsaturated soil as described in claim 1, characterized in that, After introducing structural parameters into the volume change equation of unsaturated soil and constructing a calculation model for the collapsible deformation of unsaturated soil, the following steps are also included: Isotropic compression tests were conducted on unsaturated silty clay to obtain the results of the first compression test. A compression-wetting-compression test was conducted on unsaturated soil to obtain the results of the second compression test. The accuracy of the calculation model for unsaturated soil deformation was verified based on the results of the first and second compression tests.

6. A calculation system for the collapsibility deformation of unsaturated soil, characterized in that, include: The structural parameter acquisition module is used to acquire structural parameters that quantify the impact of saturation changes on soil structure sensitivity. The functional relationship between structural parameters and saturation is shown in the following equation: In the formula, For structural parameters, For saturation, The first material parameter, This is the second material parameter. Macaulay brackets; The model building module, which communicates with the structural parameter acquisition model, is used to introduce structural parameters into the volume change equation of unsaturated soil and construct a calculation model for the collapsible deformation of unsaturated soil, as shown in the following equation: In the formula, For specific volume, For the average effective stress, For the compression curve at Slope in the plane for and The intercept of the curve when both are 0; The calculation model for unsaturated soil deformation is rewritten in incremental form as shown in the following equation: ； The soil deformation calculation module is communicatively connected to the model construction module and is used to calculate and obtain the soil deformation of unsaturated soil collapsibility based on the constructed unsaturated soil collapsibility deformation calculation model.

7. The calculation system for unsaturated soil collapsibility deformation as described in claim 6, characterized in that, Also includes: Normal compression line acquisition unit is used to experimentally obtain an idealized normal compression line of unsaturated soil. The compression line slope verification unit is communicatively connected to the normal compression line acquisition unit and is used to verify the effectiveness of the compression line slope of the calculation model for unsaturated soil collapsibility based on the acquired idealized unsaturated soil normal compression line.

8. The calculation system for unsaturated soil collapsibility deformation as described in claim 6, characterized in that, Also includes: The parameter response result acquisition unit is used to simulate multiple sets of isotropic compression tests based on the constructed calculation model of unsaturated soil collapsibility deformation, and obtain the model response results with different parameter variations. The collapsibility characteristic simulation verification unit is communicatively connected to the parameter response result acquisition unit, and is used to verify the soil collapsibility characteristic simulation capability of the unsaturated soil collapsibility deformation calculation model based on the model response results of different parameter changes.

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