Method and device for calculating equivalent shear strength of fiber reinforced soil

Abstract

The invention relates to the technical field of reinforced soil engineering, in particular to a fiber reinforced soil equivalent shear strength calculation method and device.The method comprises the steps that the length, diameter and content of target fibers in fiber reinforced soil are obtained, and the volume content and slenderness ratio of the target fibers are calculated; obtaining the length, the diameter and the content of target fibers in the fiber reinforced soil, and calculating the volume content and the slenderness ratio; calculating the initial equivalent normal stress and the initial equivalent cohesion of the fiber reinforced soil based on the volume content, the slenderness ratio and the normal stress and the cohesion of the unreinforced soil body; correcting the initial equivalent normal stress and the initial equivalent cohesion to obtain actual equivalent normal stress and actual equivalent cohesion, and further calculating the equivalent shear strength of the fiber reinforced soil. Therefore, the problems that in related technologies, the situation that the shear strength of the reinforced soil body is attenuated due to excessive fibers is not considered, and in a calculation method, excessive set parameters are set, calibration is difficult, and beneficial guidance is difficult to provide for actual engineering design are solved.

Description

Technical Field

[0001] The present application relates to the technical field of reinforced soil engineering, and in particular to a method and device for calculating the equivalent shear strength of fiber reinforced soil. Background Art

[0002] As a new type of geosynthetics, fiber is increasingly used in geotechnical engineering construction. As a physical improvement method of soil, fiber reinforcement forms a composite reinforcement body with the soil after being mixed into the soil, forming a three-dimensional mesh structure interwoven inside the soil, which effectively improves the shear resistance of the soil. Special load transfer paths are formed between the fiber-fiber, fiber-soil particles, and soil particles-soil particles in the composite reinforcement body, which synergistically bear the external load. It can be seen that the effect of fiber on the shear strength of soil is not only related to the friction, pressure, tension and interlocking force generated when the fiber is bent or interwoven, but also related to the formation of spatial constraints of the three-dimensional fiber network.

[0003] In the related technology, wavy fibers can be added to the soil to improve the soil quality, and through stirring, an appropriate amount of water can be sprinkled into the soil and compacted into a sample, thereby obtaining wavy fiber reinforced soil, and then calculating its shear strength. It is also possible to remove the dimensional influence and establish a function of the cohesion of reinforced soil and the fiber length, fiber content and fiber diameter, thereby obtaining a shear strength model, and in the process of model establishment, regression analysis is performed through experimental data.

[0004] However, in related technologies, the research focuses on the comparison of experimental phenomena and the explanation of mechanisms, without considering the situation where the shear strength of reinforced soil is attenuated due to excessive fibers. In addition, there are too many parameters set in the calculation method, which makes calibration difficult and difficult to provide useful guidance for actual engineering design. Improvement is urgently needed. Summary of the invention

[0005] The present application provides a method and device for calculating the equivalent shear strength of fiber reinforced soil, in order to solve the problems in the related art that the research focus is concentrated on the comparison of experimental phenomena and the explanation of the mechanism, without considering the attenuation of the shear strength of the reinforced soil caused by excessive fiber, and there are too many parameters set in the calculation method, which makes calibration difficult and difficult to provide useful guidance for actual engineering design.

[0006] A first aspect of the present application provides a method for calculating the equivalent shear strength of fiber-reinforced soil, comprising the following steps: obtaining the length, diameter and content of target fibers in the fiber-reinforced soil, and calculating the volume content and slenderness ratio of the target fibers based on the length, diameter and content of the target fibers; calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber-reinforced soil based on the volume content and the slenderness ratio, as well as the normal stress and cohesion of the unreinforced soil; correcting the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, and calculating the final equivalent shear strength of the fiber-reinforced soil based on the actual equivalent normal stress and the actual equivalent cohesion.

[0007] Optionally, in one embodiment of the present application, before calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and the slenderness ratio, and the normal stress and cohesion of the unreinforced soil, it also includes: obtaining the initial shear strength of the unreinforced soil; and obtaining the normal stress and cohesion of the unreinforced soil based on the initial shear strength.

[0008] Optionally, in one embodiment of the present application, before correcting the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil respectively, it also includes: judging whether the volume content and the slenderness ratio meet preset conditions; if the volume content and the slenderness ratio meet the preset conditions, it is allowed to correct the initial equivalent normal stress and the initial equivalent cohesion, otherwise it is not allowed to correct the initial equivalent normal stress and the initial equivalent cohesion.

[0009] Optionally, in one embodiment of the present application, the initial equivalent normal stress and the initial equivalent cohesion are corrected based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, including: determining the internal friction angle of the fiber-reinforced soil based on the internal friction angle of the unreinforced soil; obtaining the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil based on the volume content, the slenderness ratio and the internal friction angle; obtaining the actual equivalent normal stress of the fiber-reinforced soil based on the measured equivalent normal stress and the initial equivalent normal stress; obtaining the actual equivalent cohesion of the fiber-reinforced soil based on the measured equivalent cohesion and the initial equivalent cohesion.

[0010] Optionally, in one embodiment of the present application, the calculation formula of the actual equivalent normal stress may be, but is not limited to,:

[0011]

[0012] The calculation formula of the actual equivalent cohesion may be, but is not limited to,:

[0013]

[0014] Among them, χ f is the fiber volume content, η f is the fiber slenderness ratio, α1 and α2 are test parameters, δ th is the χ value for all trials f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

[0015] Optionally, in one embodiment of the present application, the calculation formula of the final equivalent shear strength may be, but is not limited to,:

[0016]

[0017] in, is the internal friction angle of unreinforced soil.

[0018] A second aspect of the present application provides a device for calculating the equivalent shear strength of fiber-reinforced soil, comprising: a first acquisition module, used to obtain the length, diameter and content of target fibers in the fiber-reinforced soil, and calculate the volume content and slenderness ratio of the target fibers based on the length, diameter and content of the target fibers; a calculation module, used to calculate the initial equivalent normal stress and initial equivalent cohesion of the fiber-reinforced soil based on the volume content and the slenderness ratio, as well as the normal stress and cohesion of the unreinforced soil; a first generation module, used to correct the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, and calculate the final equivalent shear strength of the fiber-reinforced soil based on the actual equivalent normal stress and the actual equivalent cohesion.

[0019] Optionally, in one embodiment of the present application, it also includes: a second acquisition module, used to obtain the initial shear strength of the unreinforced soil before calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and the slenderness ratio, and the normal stress and cohesion of the unreinforced soil; a second generation module, used to obtain the normal stress and cohesion of the unreinforced soil based on the initial shear strength.

[0020] Optionally, in one embodiment of the present application, it also includes: a judgment module, used to judge whether the volume content and the slenderness ratio meet preset conditions before correcting the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil respectively; a correction module, used to allow the initial equivalent normal stress and the initial equivalent cohesion to be corrected when the volume content and the slenderness ratio meet the preset conditions, otherwise the initial equivalent normal stress and the initial equivalent cohesion are not allowed to be corrected.

[0021] Optionally, in one embodiment of the present application, the first generation module includes: a determination unit, used to determine the internal friction angle of the fiber reinforced soil based on the internal friction angle of the unreinforced soil; an acquisition unit, used to obtain the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil in combination with the volume content, the slenderness ratio and the internal friction angle; a first generation unit, used to obtain the actual equivalent normal stress of the fiber reinforced soil based on the measured equivalent normal stress and the initial equivalent normal stress; a second generation unit, used to obtain the actual equivalent cohesion of the fiber reinforced soil based on the measured equivalent cohesion and the initial equivalent cohesion.

[0022] Optionally, in one embodiment of the present application, the calculation formula of the actual equivalent normal stress may be, but is not limited to,:

[0023]

[0024] The calculation formula of the actual equivalent cohesion may be, but is not limited to,:

[0025]

[0026] Among them, X f is the fiber volume content, η f is the fiber slenderness ratio, α1 and α2 are test parameters, δ th is the χ value for all trials f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

[0027] Optionally, in one embodiment of the present application, the calculation formula of the final equivalent shear strength may be, but is not limited to,:

[0028]

[0029] in, is the internal friction angle of unreinforced soil.

[0030] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for calculating the equivalent shear strength of fiber reinforced soil as described in the above embodiment.

[0031] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned method for calculating the equivalent shear strength of fiber-reinforced soil.

[0032] The fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, implements the above-mentioned method for calculating the equivalent shear strength of fiber-reinforced soil.

[0033] The embodiment of the present application can calculate the volume content and slenderness ratio of the target fiber of the fiber reinforced soil based on the length, diameter and content of the target fiber, and then calculate the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil in combination with the normal stress and cohesion of the unreinforced soil, and correct the initial equivalent normal stress and initial equivalent cohesion to obtain the actual equivalent normal stress and actual equivalent cohesion of the fiber reinforced soil, and finally realize the calculation of the equivalent shear strength of the fiber reinforced soil, and can accurately predict the enhanced and attenuated shear strength of the fiber reinforced soil throughout the whole process. In addition, the computational mechanics of the fiber reinforced soil in the embodiment of the present application is clear in concept, easy to apply, and reliable in result, which solves the problem that the shear strength calculation of the fiber reinforced soil is complicated and the reliability is not high, and provides an effective calculation method for the actual engineering design of the fiber reinforced soil. Therefore, the problems in the related art that the research focus is on the comparison of experimental phenomena and the explanation of the mechanism, and the situation that the shear strength of the reinforced soil is attenuated due to excessive fiber is not considered, and the calculation method sets too many parameters, which is difficult to calibrate and difficult to provide useful guidance for the actual engineering design are solved.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0036] Figure 1 A schematic block diagram of the force of a fiber reinforced soil unit provided according to an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the stress-strain relationship between fiber reinforced soil and unreinforced soil in an indoor triaxial compression test according to an embodiment of the present application;

[0038] Figure 3 (a) is a schematic block diagram of the change in equivalent cohesion under the influence of different fiber lengths provided according to an embodiment of the present application;

[0039] Figure 3 (b) is a schematic block diagram of the change in internal friction angle under the influence of different fiber lengths provided according to an embodiment of the present application;

[0040] Figure 4 (a) is a schematic block diagram of the change in equivalent cohesion under the influence of different fiber volume contents provided according to one embodiment of the present application;

[0041] Figure 4 (b) is a schematic block diagram of the change in internal friction angle under the influence of different fiber volume contents provided according to one embodiment of the present application;

[0042] Figure 5 A diagram showing a relationship between the product of the fiber volume content and the fiber slenderness ratio and the ratio of the equivalent tangent internal friction angle of fiber-reinforced soil to the tangent internal friction angle of unreinforced soil and a block diagram showing a calculated value according to an embodiment of the present application;

[0043] Figure 6 A diagram showing a relationship between the product of fiber volume content and fiber slenderness ratio and the ratio of the equivalent cohesion of fiber reinforced soil to the cohesion of unreinforced soil and a block diagram of the calculated value according to one embodiment of the present application;

[0044] Figure 7 A schematic diagram of the relationship between equivalent cohesion test data and equivalent cohesion prediction values ​​provided according to an embodiment of the present application;

[0045] Figure 8 A diagram showing a relationship between the product of fiber volume content and fiber slenderness ratio and the ratio of the equivalent normal stress of fiber reinforced soil to the normal stress of unreinforced soil and a block diagram of the calculated value according to one embodiment of the present application;

[0046] Fig. 9 A schematic diagram of the relationship between equivalent normal stress test data and equivalent normal stress prediction values ​​provided according to an embodiment of the present application;

[0047] Fig.10 (a) is a schematic diagram showing a comparison between a measured value and a predicted value of a fiber slenderness ratio of 181.82 provided according to an embodiment of the present application;

[0048] Fig.10 (b) is a schematic diagram showing a comparison between a measured value and a predicted value of a fiber slenderness ratio of 272.73 provided according to an embodiment of the present application;

[0049] Fig.10(c) is a schematic diagram showing a comparison between a measured value and a predicted value of a fiber slenderness ratio of 363.64 provided according to an embodiment of the present application;

[0050] Fig.11 A flowchart of a method for calculating equivalent shear strength of fiber reinforced soil provided according to an embodiment of the present application;

[0051] Fig.12 A flowchart of the working principle of a method for calculating equivalent shear strength of fiber reinforced soil provided according to an embodiment of the present application;

[0052] Fig.13 It is a block diagram of a device for calculating equivalent shear strength of fiber reinforced soil provided in an embodiment of the present application;

[0053] Fig.14 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0054] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0055] The following describes the method and device for calculating the equivalent shear strength of fiber-reinforced soil according to an embodiment of the present application with reference to the accompanying drawings. In view of the fact that the research focus mentioned in the above background technology is concentrated on the comparison of experimental phenomena and the explanation of mechanisms, without considering the situation where the shear strength of reinforced soil is attenuated due to excessive fibers, and there are too many parameters set in the calculation method, which makes calibration difficult and difficult to provide useful guidance for actual engineering design, the present application provides a method for calculating the equivalent shear strength of fiber-reinforced soil. In this method, the volume content and slenderness ratio of the target fiber of the fiber-reinforced soil can be calculated based on the length, diameter and content of the target fiber, and then the initial strength of the fiber-reinforced soil can be calculated in combination with the normal stress and cohesion of the unreinforced soil. The initial equivalent normal stress and initial equivalent cohesion are obtained, and the initial equivalent normal stress and initial equivalent cohesion are corrected to obtain the actual equivalent normal stress and actual equivalent cohesion of the fiber reinforced soil, and finally the calculation of the equivalent shear strength of the fiber reinforced soil is realized, and the enhanced and attenuated shear strengths of the fiber reinforced soil can be accurately predicted throughout the whole process. In addition, the computational mechanics of the fiber reinforced soil in the embodiment of the present application is clear in concept, easy to apply, and reliable in result, which solves the problem of the complication and low reliability of the shear strength calculation of the fiber reinforced soil, and provides an effective calculation method for the actual engineering design of the fiber reinforced soil. Thus, the problems in the related technology that the research focus is on the comparison of experimental phenomena and the explanation of the mechanism, without considering the situation that the shear strength of the reinforced soil is attenuated due to excessive fiber, and the calculation method sets too many parameters, which makes calibration difficult and difficult to provide useful guidance for the actual engineering design are solved.

[0056] Before introducing the method for calculating the equivalent shear strength of fiber reinforced soil proposed in the embodiment of the present application, the relevant concepts involved in the embodiment of the present application are first introduced.

[0057] like Figure 1 As shown, the tensile strength of the soil in the embodiment of the present application is very small, while the tensile strength of the fiber is relatively large. When the fiber-reinforced soil is subjected to triaxial shearing, the shear stress is transferred to the fiber through the soil-fiber interface, generating tensile stress in the fiber. Since the fiber has a high tensile strength, the fiber-reinforced soil can withstand higher shear stress than the unreinforced soil. At this time, the stress transfer also depends to a large extent on the friction characteristics of the soil-fiber interface. In addition, in the fiber-reinforced soil, the fibers are interwoven through many intersections to form a three-dimensional network structure in the soil. When the fiber-reinforced soil is subjected to shear stress, the fibers tend to pull the interwoven fibers through the intersections under the action of tension, and then the tension gradually propagates to the entire fiber network structure, which will further restrict the movement of soil particles. Therefore, the fibers tend to gather soil particles together through the interwoven network structure, and this effect is equivalent to cohesion, which is the main cause of the cohesive resistance of the fiber-reinforced soil.

[0058] like Figure 2As shown, in the embodiment of the present application, before the axial strain of triaxial compression shear reaches 4%, the deviator stress of the fiber reinforced soil and the deviator stress of the unreinforced soil have a growth trend of similar magnitude, but after the axial strain continues to increase to 4%, the deviator stress of the fiber reinforced soil continues to increase, and its trend shows a strain hardening type; while the deviator stress of the unreinforced soil gradually decreases, and its trend shows a strain softening type.

[0059] like Figure 3 As shown in the figure, the fiber length of the embodiment of the present application is 0, which means unreinforced soil. At the same fiber volume content, the cohesion increases with the increase of fiber length; however, the internal friction angle does not change significantly with the increase of fiber length. This is because longer fibers are more likely to form an interwoven fiber network, thereby enhancing the cohesion of the soil.

[0060] like Figure 4 As shown in the figure, the fiber volume content of the embodiment of the present application is 0, which means unreinforced soil. Under the same fiber length, the cohesion increases first and then decreases with the increase of fiber volume content; however, the internal friction angle does not increase significantly with the increase of fiber volume content. This is because excessive fiber will produce more fiber-fiber contact, which will reduce the bite ability between soil particles themselves, thereby reducing cohesion.

[0061] like Figure 5 As shown, the embodiment of the present application is Figure 3 (b) and Figure 4 (b) The results show that the ratio of the equivalent tangent internal friction angle of fiber reinforced soil to the tangent internal friction angle of unreinforced soil increases with χ f ·η f The increase fluctuates around 1.0, indicating that the addition of fibers to the soil has no significant effect on the internal friction angle of the soil itself.

[0062] like Figure 6 As shown in FIG. 1 , in the embodiment of the present application, at the same fiber volume content, the cohesion ratio of the fiber reinforced soil to the unreinforced soil increases with χ f ·η f This is because as the fiber content increases, more fibers will form a denser fiber network structure to wrap the soil particles, thereby increasing the cohesion. However, excessive fibers will produce more fiber-fiber contacts, which will reduce the bite ability between soil particles and thus reduce the cohesion.

[0063] like Figure 7 As shown, the cohesion value obtained by the calculation method proposed in the embodiment of the present application is compared with the cohesion value obtained by the experiment. The regression results show that the difference between the two is very small, and the calculation method of the embodiment of the present application is effective.

[0064] like Figure 8As shown in FIG. 1 , in the embodiment of the present application, at the same fiber volume content, the ratio of the normal stress of the fiber reinforced soil to that of the unreinforced soil also increases with χ f ·η f The reason is that with the increase of fiber content, more fibers will form a denser fiber network structure to wrap soil particles, which will cause the equivalent normal stress to increase. However, excessive fibers will produce more fiber-fiber contacts, which will block the effective stress transfer between fibers and soil particles, resulting in a decrease in the equivalent normal stress.

[0065] like Fig. 9 As shown, the equivalent normal stress value obtained by the calculation method proposed in the embodiment of the present application is compared with the equivalent normal stress value obtained by the experiment. The regression results show that the difference between the two is very small, and the calculation method of the embodiment of the present application is effective.

[0066] like Fig.10 As shown, the equivalent shear strength value of fiber reinforced soil obtained by the calculation method proposed in the embodiment of the present application is compared with the shear strength value obtained by the test. The comparison results show that the embodiment of the present application can better consider the characteristics of the loss of shear strength of soil caused by excessive fibers, further verifying the reliability of the calculation method.

[0067] Specifically, Fig.11 The present invention is a flowchart of a method for calculating the equivalent shear strength of fiber reinforced soil provided in an embodiment of the present application.

[0068] like Fig.11 As shown, the method for calculating the equivalent shear strength of fiber reinforced soil includes the following steps:

[0069] In step S1101, the length, diameter and content of target fibers in the fiber-reinforced soil are obtained, and the volume content and slenderness ratio of the target fibers are calculated based on the length, diameter and content of the target fibers.

[0070] In the actual implementation process, in order to calculate the volume content and slenderness ratio of the target fiber in the fiber-reinforced soil, the embodiment of the present application can first obtain the length, diameter and content of the target fiber, and then use formula (1) to formula (3) to calculate its volume content and slenderness ratio based on the obtained length, diameter and content of the target fiber. Among them, the expressions of formula (1) to formula (3) in the embodiment of the present application can be but are not limited to:

[0071]

[0072] Among them, χ f is the fiber volume content, V is the reinforced soil volume, V f is the fiber volume, m f is the fiber mass, ρ f is the fiber density, η fis the fiber slenderness ratio, L f is the fiber length, D f is the average fiber diameter.

[0073] For example, the target fiber selected in the present embodiment is polypropylene fiber, which generally has a density of 0.91 g·cm -3 The average diameter is 33 μm (generally between 18 μm and 48 μm, and this application does not make specific restrictions) μm, the lengths are 6 mm, 9 mm and 12 mm respectively, the volume contents are calculated by formula (1) and formula (2), and the calculated results are 0.59%, 1.19%, 1.78% and 2.37% respectively, the slenderness ratio is calculated by formula (3), and the calculated results are 181.82, 272.73 and 363.64 respectively, and the polypropylene fiber has good dispersion in the soil.

[0074] Optionally, in one embodiment of the present application, before calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and slenderness ratio, and the normal stress and cohesion of the unreinforced soil, it also includes: obtaining the initial shear strength of the unreinforced soil; and obtaining the normal stress and cohesion of the unreinforced soil based on the initial shear strength.

[0075] In some embodiments, before calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and slenderness ratio, and the normal stress and cohesion of the unreinforced soil, the embodiments of the present application can obtain the initial shear strength of the unreinforced soil, and then obtain the normal stress and cohesion of the unreinforced soil.

[0076] The calculation formula of the initial shear strength of the unreinforced soil in the embodiment of the present application can be, but is not limited to, expressed as:

[0077]

[0078] Optionally, in one embodiment of the present application, before correcting the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil respectively, it also includes: judging whether the volume content and the slenderness ratio meet the preset conditions; if the volume content and the slenderness ratio meet the preset conditions, it is allowed to correct the initial equivalent normal stress and the initial equivalent cohesion, otherwise it is not allowed to correct the initial equivalent normal stress and the initial equivalent cohesion.

[0079] It should be noted that, before correcting the initial equivalent shear strength of the target fiber based on the actual equivalent normal stress and the actual equivalent cohesion, the embodiment of the present application also needs to determine whether the volume content and the slenderness ratio meet certain conditions.

[0080] Exemplarily, in some embodiments, the embodiments of the present application allow the initial equivalent shear strength to be modified when the volume content and the slenderness ratio meet certain conditions.

[0081] In some embodiments, the embodiments of the present application do not allow correction of the initial equivalent shear strength when the volume content and the slenderness ratio do not meet certain conditions.

[0082] Among them, certain conditions may be excess volume content and aspect ratio, which can be specifically set by technicians in this field according to actual conditions, and this application does not impose any specific restrictions.

[0083] In step S102, the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil are calculated based on the volume content and the slenderness ratio, and the normal stress and cohesion of the unreinforced soil.

[0084] It can be understood that the fiber reinforced soil in the embodiment of the present application is a composite reinforced soil body, and its single fiber is flexible. When the surrounding soil particles squeeze the fiber, the fiber will twist and bend. Then, when the fiber reinforced soil is subjected to shear, the tensile stress generated in the bent fiber will generate positive stress at the soil-fiber contact point. This generated positive stress is recorded as equivalent positive stress and can be expressed as: σ n,eq In addition, the normal stress on the soil-fiber contact surface acts as an additional confining pressure on the soil skeleton, which mainly improves the cohesion of the fiber-reinforced soil. This pseudo-cohesion is recorded as equivalent cohesion and can be expressed as: c a,eq .

[0085] Among them, the embodiment of the present application is based on the equivalent normal stress σ defined above n,eq and equivalent cohesion c a,eq , the equivalent shear strength of fiber reinforced soil can be obtained, which can be expressed as but not limited to:

[0086]

[0087] Among them, τ eq is the equivalent shear strength of fiber reinforced soil, is the equivalent internal friction angle of fiber reinforced soil.

[0088] Furthermore, the present invention combines the test results to find that the internal friction angle of the unreinforced soil is Internal friction angle with fiber reinforced soil Basically equal, the equivalent shear strength of fiber reinforced soil can be expressed as but not limited to:

[0089]

[0090] Furthermore, the embodiment of the present application assumes that the equivalent normal stress σ n,eq and equivalent cohesion ca,eq is the product of fiber volume content and fiber slenderness ratio f ·η f The function also includes the normal stress σ0 and cohesion c0 of the unreinforced soil. The initial equivalent normal stress and initial equivalent cohesion of the embodiment of the present application can be expressed as, but not limited to:

[0091] σ n,eq =σ n,0 (1+α2·χ f ·η f ), (8)

[0092] c a,eq =c0(1+α1·χ f ·η f ), (9)

[0093] Among them, α1 and α2 are test parameters.

[0094] It should be noted that the formulas (8) and (9) of the present application can only calculate the shear strength with χ f ·η f The stage in which the shear strength decreases due to excessive fibers cannot be calculated.

[0095] It can be understood that the embodiment of the present application uses formula (8) and formula (9) to calculate the initial equivalent normal stress and initial equivalent cohesion of the fiber-reinforced soil. Through the above analysis, it can be seen that in the embodiment of the present application, when the shear strength is reduced due to excessive fibers, the equivalent normal stress and equivalent cohesion calculated by formula (8) and formula (9) will fail. Furthermore, in order to realize the calculation of the loss of equivalent shear strength caused by excessive fibers in the fiber-reinforced soil, the embodiment of the present application introduces a Gaussian mapping function in formula (8) and formula (9) to describe the strength reduction of the fiber-reinforced soil.

[0096] In step S103, the initial equivalent normal stress and the initial equivalent cohesion are corrected based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, and the final equivalent shear strength of the fiber-reinforced soil is calculated based on the actual equivalent normal stress and the actual equivalent cohesion.

[0097] As a possible implementation method, the embodiment of the present application can correct the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, and then calculate the final equivalent shear strength of the fiber-reinforced soil.

[0098] For example, the soil sample selected in the present embodiment is low plasticity clay with a maximum dry density of 1.98 g·cm-3 , the liquid limit is 25.67%, the plastic limit is 17.56%, and the optimal moisture content is 12.55%.

[0099] Furthermore, in the embodiment of the present application, the prepared materials are prepared into fiber-reinforced soil specimens according to the "Standard for Geotechnical Test Methods" GB / T50123-2019, and the specimens are loaded according to the triaxial compression test to obtain stress-strain curves of the fiber-reinforced soil and unreinforced soil under different confining pressures of 50 kPa, 100 kPa, 200 kPa and 300 kPa.

[0100] Optionally, in one embodiment of the present application, the initial equivalent normal stress and the initial equivalent cohesion are corrected based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, including: determining the internal friction angle of the fiber-reinforced soil based on the internal friction angle of the unreinforced soil; obtaining the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil in combination with the volume content, the slenderness ratio and the internal friction angle; obtaining the actual equivalent normal stress of the fiber-reinforced soil based on the measured equivalent normal stress and the initial equivalent normal stress; obtaining the actual equivalent cohesion of the fiber-reinforced soil based on the measured equivalent cohesion and the initial equivalent cohesion, wherein the calculation formula of the actual equivalent normal stress may be, but is not limited to,:

[0101]

[0102] The calculation formula of the actual equivalent cohesion can be but is not limited to:

[0103]

[0104] Among them, χ f is the fiber volume content, η f is the fiber slenderness ratio, α1 and α2 are test parameters, δ th is the χ value for all trials f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

[0105] As a possible implementation method, the embodiment of the present application can determine the internal friction angle of the fiber reinforced soil based on the internal friction angle of the unreinforced soil, and then obtain the measured equivalent normal stress and measured equivalent cohesion of the fiber reinforced soil by combining the volume content, slenderness ratio and internal friction angle, and then obtain the actual equivalent normal stress and actual equivalent cohesion of the fiber reinforced soil.

[0106] For example, in the embodiment of the present application, a Gaussian mapping function is introduced into equations (8) and (9) to describe the decrease in strength of fiber reinforced soil. Then, equations (8) and (9) can be rewritten as shown in equations (10) and (11), which can be expressed as, but not limited to:

[0107]

[0108] Among them, β1 and β2 are test parameters, δ th is the χ value for all trials f ·η f The maximum value corresponding to the optimal fiber content.

[0109] Optionally, in one embodiment of the present application, the calculation formula of the final equivalent shear strength may be, but is not limited to,:

[0110]

[0111] in, is the internal friction angle of unreinforced soil.

[0112] In the actual implementation process, the embodiment of the present application can substitute equation (10) and equation (11) into equation (7) to obtain the calculation formula of the final equivalent shear strength of the fiber reinforced soil, which can be but is not limited to:

[0113]

[0114] It can be understood that, in the embodiment of the present application, when the target fiber volume content and slenderness ratio are 0, χ in formula (12) f ·η f and δ th are also 0. At this time, α1 and α2 are specified as 0, and the expression degenerates into the cohesion and normal stress of the unreinforced soil.

[0115] For example, in the embodiment of the present application, based on the stress-strain values ​​obtained above, the deviatoric stress corresponding to 20% of the axial strain is taken to determine the actual cohesion, actual normal stress and internal friction angle of the shear strength, and the initial equivalent shear strength is determined by formula (7).

[0116] Furthermore, the present embodiment fits the test data under known different test conditions through equations (10) and (11) to determine the parameters α1, α2, β1, β2 and δ th After data fitting, the α1 of polypropylene fiber reinforced soil is 3.50, α2 is 0.40, β1 is 0.05, β2 is 0.06, and δ th is 6.47. Then, by substituting equations (10) and (11) into equation (7), we can obtain expression (12) for calculating the final equivalent shear strength of polypropylene fiber reinforced soil.

[0117] The working principle of the method for calculating the equivalent shear strength of fiber reinforced soil proposed in the embodiment of the present application is described in detail below with reference to a specific embodiment.

[0118] Embodiment 1:

[0119] Step S1201: Select target fibers and calculate the volume content and slenderness ratio of the target fibers.

[0120] The target fiber selected in the present embodiment is polypropylene fiber, which generally has a density of 0.91 g·cm -3 The average diameter is 33 μm (generally between 18 μm and 48 μm, and this application does not make specific restrictions) μm, the lengths are 6 mm, 9 mm and 12 mm respectively, the volume contents are calculated by formula (1) and formula (2), and the calculated results are 0.59%, 1.19%, 1.78% and 2.37% respectively, the slenderness ratio is calculated by formula (3), and the calculated results are 181.82, 272.73 and 363.64 respectively, and the polypropylene fiber has good dispersion in the soil.

[0121] Step S1202: Select soil samples.

[0122] The soil sample selected in the present embodiment is low plasticity clay with a maximum dry density of 1.98 g·cm -3 , the liquid limit is 25.67%, the plastic limit is 17.56%, and the optimal moisture content is 12.55%.

[0123] Step S1203: respectively obtaining stress-strain curves of the fiber reinforced soil and the unreinforced soil.

[0124] Among them, the embodiment of the present application prepares the prepared materials into fiber reinforced soil samples according to the "Geotechnical Test Method Standard" GB / T50123-2019, loads the samples according to the triaxial compression test, and obtains the stress-strain curves of the fiber reinforced soil and unreinforced soil under different confining pressures of 50kPa, 100kPa, 200kPa and 300kPa.

[0125] Step S1204: Calculate the initial equivalent shear strength.

[0126] Among them, according to the stress-strain values ​​obtained above, the embodiment of the present application takes the deviatoric stress corresponding to 20% of the axial strain to determine the actual cohesion, actual normal stress and internal friction angle of the shear strength, and the initial equivalent shear strength is determined by formula (7).

[0127] Step S1205: Obtain relevant test parameter values.

[0128] Among them, the embodiment of the present application uses equations (10) and (11) to fit the test data under known different test conditions to determine the parameters α1, α2, β1, β2 and δ th After data fitting, the α1 of polypropylene fiber reinforced soil is 3.50, α2 is 0.40, β1 is 0.05, β2 is 0.06, and δ th It is 6.47.

[0129] Step S1206: Generate the final equivalent shear strength.

[0130] In this embodiment of the present application, by substituting equations (10) and (11) into equation (7), expression (12) for calculating the final equivalent shear strength of polypropylene fiber reinforced soil can be obtained.

[0131] According to the method for calculating the equivalent shear strength of fiber-reinforced soil proposed in the embodiment of the present application, the volume content and slenderness ratio of the target fibers of the fiber-reinforced soil can be calculated based on the length, diameter and content of the target fibers, and then the initial equivalent normal stress and initial equivalent cohesion of the fiber-reinforced soil can be calculated in combination with the normal stress and cohesion of the unreinforced soil. The initial equivalent normal stress and initial equivalent cohesion are corrected to obtain the actual equivalent normal stress and actual equivalent cohesion of the fiber-reinforced soil, and finally the calculation of the equivalent shear strength of the fiber-reinforced soil is realized, and the enhanced and attenuated shear strengths of the fiber-reinforced soil can be accurately predicted throughout the whole process. In addition, the computational mechanics of the fiber-reinforced soil in the embodiment of the present application is clear in concept, easy to apply, and reliable in result, which solves the problem of complicated shear strength calculation of fiber-reinforced soil and low reliability, and provides an effective calculation method for the actual engineering design of fiber-reinforced soil. This solves the problems in related technologies, such as the research focus is on the comparison of experimental phenomena and the explanation of mechanisms, without considering the attenuation of the shear strength of reinforced soil caused by excessive fibers, and too many parameters are set in the calculation method, which makes calibration difficult and difficult to provide useful guidance for actual engineering design.

[0132] Next, a fiber reinforced soil equivalent shear strength calculation device proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0133] Fig.13 It is a block diagram of a device for calculating the equivalent shear strength of fiber reinforced soil provided according to an embodiment of the present application.

[0134] like Fig.13 As shown, the fiber reinforced soil equivalent shear strength calculation device 10 includes: a first acquisition module 100, a calculation module 200 and a first generation module 300.

[0135] The first acquisition module 100 is used to acquire the length, diameter and content of target fibers in the fiber-reinforced soil, and calculate the volume content and slenderness ratio of the target fibers based on the length, diameter and content of the target fibers.

[0136] The calculation module 200 is used to calculate the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and the slenderness ratio, and the normal stress and cohesion of the unreinforced soil.

[0137] The first generation module 300 is used to correct the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, and to calculate the equivalent shear strength of the fiber-reinforced soil based on the actual equivalent normal stress and the actual equivalent cohesion.

[0138] Optionally, in one embodiment of the present application, it also includes: a second acquisition module and a second generation module.

[0139] The second acquisition module is used to obtain the initial shear strength of the unreinforced soil before calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and the slenderness ratio, and the normal stress and cohesion of the unreinforced soil.

[0140] The second generation module is used to obtain the normal stress and cohesion of the unreinforced soil based on the initial shear strength.

[0141] Optionally, in an embodiment of the present application, it also includes: a judgment module and a correction module.

[0142] Among them, the judgment module is used to judge whether the volume content and the slenderness ratio meet the preset conditions before correcting the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil respectively.

[0143] The correction module is used to allow the initial equivalent normal stress and the initial equivalent cohesion to be corrected when the volume content and the slenderness ratio meet the preset conditions, otherwise the initial equivalent normal stress and the initial equivalent cohesion are not allowed to be corrected.

[0144] Optionally, in one embodiment of the present application, the first generating module 300 includes: a determining unit, an acquiring unit, a first generating unit and a second generating unit.

[0145] The determination unit is used to determine the internal friction angle of the fiber reinforced soil based on the internal friction angle of the unreinforced soil.

[0146] The acquisition unit is used to obtain the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil in combination with the volume content, slenderness ratio and internal friction angle.

[0147] The first generating unit is used to obtain the actual equivalent normal stress of the fiber reinforced soil based on the measured equivalent normal stress and the initial equivalent normal stress.

[0148] The second generating unit is used to obtain the actual equivalent cohesion of the fiber reinforced soil based on the measured equivalent cohesion and the initial equivalent cohesion.

[0149] Optionally, in one embodiment of the present application, the calculation formula of the actual equivalent normal stress may be, but is not limited to,:

[0150]

[0151] The calculation formula of the actual equivalent cohesion can be but is not limited to:

[0152]

[0153] Among them, χ f is the fiber volume content, η f is the fiber slenderness ratio, α1 and α2 are test parameters, δ th is the χ value for all trials f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

[0154] Optionally, in one embodiment of the present application, the calculation formula of the final equivalent shear strength may be, but is not limited to,:

[0155]

[0156] in, is the internal friction angle of unreinforced soil.

[0157] It should be noted that the above explanations of the embodiment of the method for calculating the equivalent shear strength of fiber-reinforced soil are also applicable to the device for calculating the equivalent shear strength of fiber-reinforced soil of this embodiment, and will not be repeated here.

[0158] According to the fiber-reinforced soil equivalent shear strength calculation device proposed in the embodiment of the present application, the volume content and slenderness ratio of the target fiber of the fiber-reinforced soil can be calculated based on the length, diameter and content of the target fiber of the fiber-reinforced soil, and then the initial equivalent normal stress and initial equivalent cohesion of the fiber-reinforced soil are calculated in combination with the normal stress and cohesion of the unreinforced soil, and the initial equivalent normal stress and initial equivalent cohesion are corrected to obtain the actual equivalent normal stress and actual equivalent cohesion of the fiber-reinforced soil, and finally the calculation of the equivalent shear strength of the fiber-reinforced soil is realized, and the enhanced and attenuated shear strengths of the fiber-reinforced soil can be accurately predicted throughout the whole process. In addition, the computational mechanics of the fiber-reinforced soil in the embodiment of the present application is clear in concept, easy to apply, and reliable in result, which solves the problem of complicated shear strength calculation of fiber-reinforced soil and low reliability, and provides an effective calculation method for the actual engineering design of fiber-reinforced soil. This solves the problems in related technologies, such as the research focus is on the comparison of experimental phenomena and the explanation of mechanisms, without considering the attenuation of the shear strength of reinforced soil caused by excessive fibers, and too many parameters are set in the calculation method, which makes calibration difficult and difficult to provide useful guidance for actual engineering design.

[0159] Fig.14 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. The electronic device may include:

[0160] A memory 1401 , a processor 1402 , and a computer program stored in the memory 1401 and executable on the processor 1402 .

[0161] When the processor 1402 executes the program, the method for calculating the equivalent shear strength of fiber reinforced soil provided in the above embodiment is implemented.

[0162] Furthermore, the electronic device further comprises:

[0163] The communication interface 1403 is used for communication between the memory 1401 and the processor 1402 .

[0164] The memory 1401 is used to store computer programs that can be executed on the processor 1402 .

[0165] The memory 1401 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0166] If the memory 1401, the processor 1402 and the communication interface 1403 are implemented independently, the communication interface 1403, the memory 1401 and the processor 1402 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.14 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0167] Optionally, in a specific implementation, if the memory 1401, the processor 1402 and the communication interface 1403 are integrated on a chip, the memory 1401, the processor 1402 and the communication interface 1403 can communicate with each other through an internal interface.

[0168] The processor 1402 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0169] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for calculating the equivalent shear strength of fiber-reinforced soil.

[0170] An embodiment of the present application also provides a computer program product, including a computer program, which, when executed, implements the above method for calculating the equivalent shear strength of fiber-reinforced soil.

[0171] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0172] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0173] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0174] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0175] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0176] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0177] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0178] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for calculating the equivalent shear strength of fiber reinforced soil, characterized in that: The following steps are involved: Obtaining the length, diameter and content of target fibers in the fiber-reinforced soil, and calculating the volume content and slenderness ratio of the target fibers based on the length, diameter and content of the target fibers; Calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and the slenderness ratio, as well as the normal stress and cohesion of the unreinforced soil; The initial equivalent normal stress and the initial equivalent cohesion are respectively corrected based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, and the final equivalent shear strength of the fiber-reinforced soil is calculated based on the actual equivalent normal stress and the actual equivalent cohesion.

2. The method according to claim 1, characterized in that Before calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and the slenderness ratio, and the normal stress and cohesion of the unreinforced soil, the method further includes: Obtaining the initial shear strength of the unreinforced soil; Based on the initial shear strength, the normal stress and cohesion of the unreinforced soil are obtained.

3. The method according to claim 1, characterized in that Before respectively correcting the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil, the method further comprises: Determining whether the volume content and the slenderness ratio meet preset conditions; If the volume content and the slenderness ratio meet the preset conditions, the initial equivalent normal stress and the initial equivalent cohesion are allowed to be corrected; otherwise, the initial equivalent normal stress and the initial equivalent cohesion are not allowed to be corrected.

4. The method according to claim 1, characterized in that The correcting the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil respectively to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber reinforced soil comprises: Determining the internal friction angle of the fiber reinforced soil based on the internal friction angle of the unreinforced soil; Combining the volume content, the slenderness ratio and the internal friction angle, obtaining the measured equivalent normal stress and the measured equivalent cohesion of the fiber reinforced soil; Obtaining the actual equivalent normal stress of the fiber reinforced soil based on the measured equivalent normal stress and the initial equivalent normal stress; The actual equivalent cohesion of the fiber reinforced soil is obtained based on the measured equivalent cohesion and the initial equivalent cohesion.

5. The method according to claim 1, characterized in that in, The calculation formula of the actual equivalent normal stress is: The calculation formula of the actual equivalent cohesion is: Among them, χ f is the fiber volume content, η f is the fiber slenderness ratio, α1 and α2 are test parameters, δ th is the χ value for all trials f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

6. The method according to claim 1, characterized in that The calculation formula of the final equivalent shear strength is: in, is the internal friction angle of unreinforced soil.

7. A device for calculating equivalent shear strength of fiber reinforced soil, characterized in that: include: An acquisition module, used to acquire the length, diameter and content of target fibers in the fiber-reinforced soil, and calculate the volume content and slenderness ratio of the target fibers based on the length, diameter and content of the target fibers; A calculation module, used for calculating the initial equivalent normal stress and initial equivalent cohesion of the fiber reinforced soil based on the volume content and the slenderness ratio, and the normal stress and cohesion of the unreinforced soil; A generation module is used to correct the initial equivalent normal stress and the initial equivalent cohesion based on the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil, and to calculate the final equivalent shear strength of the fiber-reinforced soil based on the actual equivalent normal stress and the actual equivalent cohesion.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for calculating the equivalent shear strength of fiber reinforced soil as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for calculating the equivalent shear strength of fiber reinforced soil as described in any one of claims 1 to 5.

10. A computer program product, characterized in that It comprises a computer program, which, when executed, is used to implement the method for calculating the equivalent shear strength of fiber reinforced soil as claimed in any one of claims 1 to 5.

Images