Unsaturated soil collapsibility deformation calculation method and system

Abstract

The invention provides an unsaturated soil collapsibility deformation calculation method and system. The method comprises the following steps: obtaining structure parameters for quantifying the influence of saturation change on soil structure sensitivity; introducing the structure parameters into the volume change equation of the unsaturated soil, and constructing an unsaturated soil collapsibility deformation calculation model; and based on the constructed unsaturated soil collapsibility deformation calculation model, calculating to obtain the soil body deformation amount of unsaturated soil collapsibility deformation. According to the unsaturated soil collapsing deformation calculation method provided by the invention, the sensitivity of the soil structure along with the change of the saturation is reflected by introducing a structure parameter related to the saturation, so that the moisture-induced collapse behavior of the unsaturated soil controlled by the water content is effectively simulated; and help is provided for predicting foundation settlement, evaluating slope stability, solving engineering geology problems and the like.

Description

Technical Field

[0001] The present application relates to the technical field of unsaturated soil collapsible deformation research, and in particular to a method and system for calculating unsaturated soil collapsible deformation. Background Art

[0002] Influenced by factors such as rainfall and groundwater activity, soils in nature are usually partially saturated with water and in an unsaturated state. For soils with loose structures, such as loess, their mechanical response in an unsaturated state is particularly complex. When subjected to changes in saturation or matrix suction, the volume, shear strength, and hydraulic properties of soils such as loess will change significantly. In engineering geology, this significant volume deformation caused by increased saturation is defined as collapsible deformation, which is a direct factor leading to many geological engineering problems, including slope instability, foundation settlement, and underground structure failure. There are many reasons for soil collapsible deformation, including the dissolution of soluble soil components, the weakening of capillary water film and intergranular bridging, the rupture of soil intergranular contact cementation, and the resulting reorganization and destruction of the microstructure.

[0003] Specifically, the mechanism of collapsibility is that the contact and bonding between particles with large pore structures breaks down under the action of water, causing the large pore structure to be destroyed and the porosity of the soil to decrease. These complex interactions significantly change the macroscopic mechanical behavior of the soil, thereby increasing the challenge of using mathematical methods to describe the mechanical behavior of unsaturated soils. Accurately describing the impact of saturation changes on soil structure is the key to simulating the collapsible deformation of unsaturated soils.

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

[0005] υ=N-λlnp′

[0006] Where λ is the compression coefficient, and N is the value of the specific volume υ when lnp′=0. When the volume change equation of saturated soil is extended to unsaturated soil, the volume change of the soil is also significantly affected by the matrix suction. In this case, the effective stress should include two components: the net mean stress and the matrix suction, namely:

[0007]

[0008] in, is the net mean stress, p Sis a function of matrix suction, or a function of matrix suction and saturation. If effective stress does effectively control soil volume, then v should remain constant under 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. The soil compression path shows that when λ is a function of s, the slope of the normal compression line decreases with increasing matrix suction, that is, λ(s)<λ(0).

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

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

[0011] In a first aspect, the present application provides a method for calculating the soil deformation of unsaturated soil collapsible deformation, comprising the following steps:

[0012] Obtaining structural parameters used to quantify the effects of saturation changes on soil structural sensitivity;

[0013] Introducing structural parameters into the volume change equation of unsaturated soil, a calculation model for the collapse deformation of unsaturated soil is constructed;

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

[0015] In combination with the first aspect, in one embodiment, the functional relationship between the structural parameter and the saturation in the structural parameter used to quantify the effect of saturation change on soil structure sensitivity is as shown in the following formula:

[0016] δ=exp(<αln(1-S r )+β>)

[0017] In the formula, δ is the structural parameter, S r is the saturation, α is the first material parameter, β is the second material parameter, all of which are determined by curve fitting; <> are Macaulay brackets.

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

[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 slope of the compression curve in the lnv-lnp′ plane, N * is the intercept of the curve when lnp′ and lnδ are both 0;

[0021] The unsaturated soil collapsible deformation calculation model is rewritten into an incremental form as shown below:

[0022]

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

[0024] Extract idealized normal compression line of unsaturated soil based on test results;

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

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

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

[0028] According to the model response results of different parameter changes, the soil collapsibility characteristics simulation capability of the unsaturated soil collapsible deformation calculation model is verified.

[0029] In combination with the first aspect, in one implementation, the multiple groups of isotropic compression tests include soil compression curves at different matrix suction levels, soil compression curves at different first material parameters, and soil compression curves at different second material parameters.

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

[0031] Conduct isotropic compression tests on unsaturated silty clay and obtain the first compression test results;

[0032] Conduct compression-wetting-compression test on unsaturated soil and obtain the second compression test result;

[0033] Based on the first compression test results and the second compression test results, the calculation accuracy of the unsaturated soil collapsible deformation calculation model is verified.

[0034] In a second aspect, the present application provides a system for calculating the collapsible deformation of unsaturated soil, comprising:

[0035] A structural parameter acquisition module, used to obtain structural parameters for quantifying the effect of saturation changes on soil structural sensitivity;

[0036] A model building module is connected to the structural parameter acquisition model for introducing structural parameters into the volume change equation of unsaturated soil to build a calculation model for the collapse deformation of unsaturated soil;

[0037] The soil deformation calculation module is connected to the model building module for calculating the soil deformation of the unsaturated soil collapsible deformation based on the constructed unsaturated soil collapsible deformation calculation model.

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

[0039] Normal compression line acquisition unit, used to obtain the idealized normal compression line of unsaturated soil;

[0040] The compression line slope verification unit is in communication connection with 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 according to the acquired idealized normal compression line of unsaturated soil.

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

[0042] The parameter response result acquisition unit is used to simulate multiple groups of isotropic compression tests based on the constructed unsaturated soil collapsible deformation calculation model to obtain the model response results of different parameter changes;

[0043] The collapsible characteristic simulation verification unit is connected to the parameter response result acquisition unit for verifying the soil collapsible characteristic simulation capability of the unsaturated soil collapsible deformation calculation model according to the model response results of different parameter changes.

[0044] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0045] The calculation method of unsaturated soil shrinkage deformation provided in this application introduces a structural parameter related to saturation to reflect the sensitivity of soil structure to changes in saturation, effectively simulates the moisture-induced collapse behavior of unsaturated soil controlled by water content, and provides assistance in predicting foundation settlement, evaluating slope stability, and solving engineering geological problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A flow chart of a method for calculating the collapsible deformation of unsaturated soil provided in an embodiment of the present application;

[0047] Figure 2 It is the normal compression line diagram of idealized unsaturated soil;

[0048] Figure 3 A model response diagram of the embodiment of the present application as the matrix suction changes;

[0049] Figure 4 (a) is a model response diagram according to the first material parameter provided in an embodiment of the present application; Figure 4 (b) is a model response diagram provided in an embodiment of the present application as the second material parameter changes;

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

[0051] Figure 6 A curve diagram of the change in porosity of soil under different matrix suction effective stresses in a compression-wetting-compression test of unsaturated soil provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0054] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0055] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0056] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the 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 in sequence or in parallel, and these operations or steps may be combined.

[0057] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0058] NCL: Normal Compression Line Normal compression line.

[0059] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

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

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

[0062] Step S3: Based on the constructed unsaturated soil collapsible deformation calculation model, the soil deformation of the unsaturated soil collapsible deformation is calculated and obtained.

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

[0064] Step S11: Visual compression coefficient λ * and N * As a constant, a structural parameter is introduced to quantify the effect of saturation change on soil structure sensitivity. Based on the analysis and reasoning of existing literature and experimental data, the functional relationship between structural parameters 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 is saturation; α is the first material parameter, β is the second material parameter, both are determined by curve fitting; <> is the Macaulay bracket, which represents the non-negative part of a value. When the value in the bracket is positive or zero, the original value is taken, and when the value in the bracket is negative, it is taken as zero;

[0067] The present application provides a structural parameter directly related to the saturation. By introducing the structural parameter related to the saturation, the changes in soil structure at different saturations can be accurately described. The introduction of the structural parameter enables the model to capture the phenomenon of moisture-induced collapse and its impact on soil compressibility, thereby explaining the changes in the NCL slope under different suction conditions, effectively simulating the phenomenon of moisture-induced collapse, reflecting the sensitivity of soil structure to changes in saturation, and can well explain the different changes in the NCL slope under different suctions observed in the compression test and the NCL slope under saturated conditions.

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

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

[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 slope of the compression curve in the lnδ-lnp′ plane, N * is the intercept of the curve when both lnp′ and lnδ are 0.

[0072] Step S122: rewrite the volume change equation of the unsaturated soil after the structural parameters are introduced into an incremental form, and construct an incremental form of unsaturated soil collapsible deformation calculation model, as shown in the following formula:

[0073]

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

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

[0076] The calculation method of unsaturated soil collapsible deformation provided in the present application introduces a structural parameter related to saturation to reflect the sensitivity of soil structure to changes in saturation, effectively simulates the moisture-induced collapse controlled by water content, and can well explain the different changes in the slope of the normal compression line under different matrix suctions observed in the compression test and the slope of the normal compression line under saturated conditions;

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

[0078] The present application provides a new volume change equation based on effective stress and soil structural properties, which captures these changes by changing the degree of saturation, provides accurate description and prediction, and is suitable for describing the behavior of various unsaturated soils including dry-wet cycle conditions. Dry-wet cycle conditions have a significant impact on soil deformation characteristics. This lays a solid foundation for establishing a constitutive model of unsaturated soils, enables the model to be effectively applied under various practical engineering conditions, more accurately reflects the deformation characteristics of soil under different water conditions, and more realistically describes the behavior of soil under dry-wet cycle conditions, providing a basis for the subsequent construction of an unsaturated soil constitutive model.

[0079] The method for calculating the collapsible deformation of unsaturated soil provided in this application obtains a volume change equation which is the basis for establishing the constitutive relationship of the soil, can accurately reflect the deformation characteristics of the soil under different water content conditions and more realistically describe the behavior of the soil under dry-wet cycle conditions. The equation structure is simple and can provide strong assistance for the subsequent construction of the unsaturated soil constitutive model.

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

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

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

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

[0084] Extract idealized normal compression line of unsaturated soil based on test results;

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

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

[0087] Obtain stress change data and soil mass change data of saturated soil, as well as stress change data and soil mass change data of unsaturated soil

[0088] like Figure 2As shown in the figure, the blue dashed line represents the normal compression line of saturated soil, the black dashed line and the black solid line represent the normal compression line of the transition stage and the actual trajectory of the unsaturated soil under constant matrix suction, respectively. When the soil transitions from the saturated state to the unsaturated state, the increase in effective stress causes the normal compression line to move from the position indicated by the blue dashed line to the position indicated by the black dashed line (marked as I). For the normal compression line of unsaturated soil under constant matrix suction, the increase in external stress (dp') causes the soil pores to be compressed, thereby increasing the degree of saturation (dS r >0). As the saturation changes, the normal compression line moves from position I to position III in the figure. In the lnυ-lnp′ plane 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 change). Connecting these points with a black solid line forms the actual trajectory of the normal compression line of unsaturated soil, that is, the idealized normal compression line of unsaturated soil obtained by the unsaturated soil compression test.

[0089] Depend on Figure 2 It can be seen that the slope of the actual trajectory of the normal compression line is determined by the effective stress p' and the saturation S r The common control can therefore well explain the phenomenon that the asymptotic slopes of the normal compression lines under different matrix suctions observed in the experiment are different in magnitude from the slopes of the normal compression lines under saturation conditions.

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

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

[0092] According to the model response results of different parameter changes, the soil collapsibility characteristics simulation capability of the unsaturated soil collapsible deformation calculation model is verified.

[0093] In a specific embodiment, step S2B: by focusing on the influence of effective stress and structural parameters on matrix suction, first material parameters and second material parameters, verifying the ability of the unsaturated soil collapsible deformation calculation model to simulate soil collapsible characteristics is implemented as follows:

[0094] Several sets of isotropic compression test simulations were carried out, focusing on the effects of effective stress and structural parameters on the soil collapsibility characteristics, namely the effects of three parameters: matrix suction s, the first material parameter α, and the second material parameter β;

[0095] like Figure 3The figure shows the compression curve of unsaturated soil when the matrix suction s is 0-400 kPa. Under different matrix suction levels, the normal compression lines intersect in the plane (the intersection position is shown as a black dot), and the curve corresponding to the low matrix suction is located below the high matrix suction curve on the right side of the intersection point, which indicates that the method provided by the present application effectively simulates the collapsible characteristic of the unsaturated soil body caused by moisture collapse controlled by the saturated state.

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

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

[0098] Conduct isotropic compression tests on unsaturated silty clay and obtain the first compression test results;

[0099] Conduct compression-wetting-compression test on unsaturated soil and obtain the second compression test result;

[0100] Based on the first compression test results and the second compression test results, the calculation accuracy of the unsaturated soil collapsible deformation calculation model is verified.

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

[0102] The isotropic compression test of unsaturated silty clay and the compression-wetting-compression test of unsaturated soil were simulated to verify the accuracy of the method. The results are as follows: Figure 5 and Figure 6 This shows that the model simulation is in good agreement with the test data and can accurately reflect the collapsible behavior of unsaturated soil and the compression characteristics of soil.

[0103] From step S2A, step S2B, and step S2C, it can be seen that:

[0104] 1. This method directly reflects the wetting collapse of soil by introducing effective stress and structural parameters, and intuitively reveals the volume change characteristics of soil with the change of saturation. It does not need to involve complex mechanism processes such as mechanics and chemistry, and shows the advantages of simplicity, efficiency and easy integration into the establishment process of various constitutive models.

[0105] 2. The structural parameters proposed in this method are functions directly related to the saturation and are used to describe the collapse behavior caused by saturation changes. The proposed model well explains the different changes in the NCL slope under different suctions observed in the compression test, which 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 conditions and the behavior of soil under dry-wet cycle conditions. It can be applied to construct the constitutive model of unsaturated soil, making the constructed unsaturated soil constitutive model structure simpler and effectively applied to a variety of actual engineering conditions.

[0107] In the second aspect, the present application provides a system for calculating the collapsible 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 is used to obtain structural parameters for quantifying the influence of saturation changes on soil structural sensitivity; the model construction module is connected in communication with the structural parameter acquisition model, and is used to introduce structural parameters into the volume change equation of unsaturated soil to construct a calculation model for collapsible deformation of unsaturated soil; the soil deformation calculation module is connected in communication with the model construction module, and is used to calculate and obtain the soil deformation of unsaturated soil collapsible deformation based on the constructed calculation model for collapsible deformation of unsaturated soil.

[0108] Among them, the functional implementation of each module in the above-mentioned unsaturated soil collapsible deformation calculation system corresponds to the steps in the above-mentioned unsaturated soil collapsible deformation calculation method embodiment, and its functions and implementation processes are no longer repeated here one by one.

[0109] In one embodiment, it further includes:

[0110] Normal compression line acquisition unit, used to obtain the idealized normal compression line of unsaturated soil;

[0111] The compression line slope verification unit is in communication connection with the normal compression line acquisition unit and is used to verify the validity of the compression line slope of the unsaturated soil collapsible deformation calculation model according to the acquired idealized normal compression line of unsaturated soil.

[0112] In one embodiment, it further includes:

[0113] The parameter response result acquisition unit is used to simulate multiple groups of isotropic compression tests based on the constructed unsaturated soil collapsible deformation calculation model to obtain the model response results of different parameter changes;

[0114] The collapsible characteristic simulation verification unit is connected to the parameter response result acquisition unit for verifying the soil collapsible characteristic simulation capability of the unsaturated soil collapsible deformation calculation model according to the model response results of different parameter changes.

[0115] In a third aspect, an embodiment of the present application provides a device for calculating the collapsible deformation of unsaturated soil. The device for calculating the soil deformation of unsaturated soil collapsible deformation can be a personal computer (PC), a laptop computer, a server, or other device with data processing function.

[0116] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the unsaturated soil collapsible deformation calculation device, and the interface used to realize the interconnection between the unsaturated soil collapsible deformation calculation device and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0117] The 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 may be a general-purpose processor, which may call the unsaturated soil collapsible deformation calculation program stored in the memory and execute the unsaturated soil collapsible deformation calculation method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the unsaturated soil collapsible deformation calculation program is called may refer to the various embodiments of the unsaturated soil collapsible deformation calculation method of the present application, which will not be described in detail here.

[0119] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0120] The readable storage medium of the present application stores an unsaturated soil collapsible deformation calculation program, wherein when the unsaturated soil collapsible deformation calculation program is executed by a processor, the steps of the unsaturated soil collapsible deformation calculation method as described above are implemented.

[0121] Among them, the method implemented when the unsaturated soil collapsible deformation calculation program is executed can refer to the various embodiments of the unsaturated soil collapsible deformation calculation method of the present application, and will not be repeated here.

[0122] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0123] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0124] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for calculating the collapsible deformation of unsaturated soil, characterized in that: The following steps are involved: Obtaining structural parameters used to quantify the effects of saturation changes on soil structural sensitivity; Introducing structural parameters into the volume change equation of unsaturated soil, a calculation model for the collapse deformation of unsaturated soil is constructed; Based on the constructed unsaturated soil collapsible deformation calculation model, the soil deformation of the unsaturated soil collapsible deformation is calculated.

2. The method for calculating the collapsible deformation of unsaturated soil according to claim 1, characterized in that: The functional relationship between the structural parameter and the saturation in the structural parameter used to quantify the influence of saturation change on soil structure sensitivity is shown in the following formula: δ=exp(<αln(1-S r )+b>) In the formula, δ is the structural parameter, S r is the saturation, α is the first material parameter, β is the second material parameter, and <> are Macaulay brackets.

3. The method for calculating the collapsible deformation of unsaturated soil according to claim 1, characterized in that: The structural parameters are introduced into the volume change equation of unsaturated soil to construct the unsaturated soil collapsible deformation calculation model, as shown in the following formula: lnv=N * -l * lnp′+λ * lnδ In the formula, v is the specific volume, p′ is the average effective stress, and λ * is the slope of the compression curve in the lnv-lnp′ plane, N * is the intercept of the curve when lnp′ and lnδ are both 0; The unsaturated soil deformation calculation model is rewritten into an incremental form as shown below:

4. The method for calculating the collapsible deformation of unsaturated soil according to claim 1, characterized in that: After introducing the structural parameters into the volume change equation of unsaturated soil and constructing the unsaturated soil collapsible deformation calculation model, the following steps are also included: Extract idealized normal compression line of unsaturated soil based on test results; Based on the idealized normal compression line of unsaturated soil obtained, the effectiveness of the compression line slope of the unsaturated soil deformation calculation model is verified.

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

6. The method for calculating the collapsible deformation of unsaturated soil according to claim 5, characterized in that: The multiple groups 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.

7. The method for calculating the collapsible deformation of unsaturated soil according to claim 1, characterized in that: After introducing the structural parameters into the volume change equation of unsaturated soil and constructing the unsaturated soil collapsible deformation calculation model, the following steps are also included: Conduct isotropic compression tests on unsaturated silty clay and obtain the first compression test results; Conduct compression-wetting-compression test on unsaturated soil and obtain the second compression test result; According to the first compression test results and the second compression test results, the calculation accuracy of the unsaturated soil deformation calculation model is verified.

8. An unsaturated soil collapsible deformation calculation system, characterized in that: include: A structural parameter acquisition module, used to obtain structural parameters for quantifying the effect of saturation changes on soil structural sensitivity; A model building module is connected to the structural parameter acquisition model for introducing structural parameters into the volume change equation of unsaturated soil to build a calculation model for the collapse deformation of unsaturated soil; The soil deformation calculation module is connected to the model building module for calculating the soil deformation of the unsaturated soil collapsible deformation based on the constructed unsaturated soil collapsible deformation calculation model.

9. The unsaturated soil collapsible deformation calculation system according to claim 8, characterized in that: Also includes: Normal compression line acquisition unit, used to obtain the idealized normal compression line of unsaturated soil in the test; The compression line slope verification unit is in communication connection with the normal compression line acquisition unit and is used to verify the validity of the compression line slope of the unsaturated soil collapsible deformation calculation model according to the acquired idealized normal compression line of unsaturated soil.

10. The unsaturated soil collapsible deformation calculation system according to claim 8, characterized in that: Also includes: The parameter response result acquisition unit is used to simulate multiple groups of isotropic compression tests based on the constructed unsaturated soil collapsible deformation calculation model to obtain the model response results of different parameter changes; The collapsible characteristic simulation verification unit is connected to the parameter response result acquisition unit for verifying the soil collapsible characteristic simulation capability of the unsaturated soil collapsible deformation calculation model according to the model response results of different parameter changes.

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