Calculation method and device for equivalent shear strength of fiber reinforced soil

Abstract

The application relates to the technical field of reinforced soil engineering, in particular to a kind of fiber reinforced soil equivalent shear strength calculation method and device, wherein, the method comprises: obtaining the length, diameter and content of target fiber in fiber reinforced soil, and calculating the volume content and slenderness ratio of target fiber;Obtain the length, diameter and content of target fiber in fiber reinforced soil, calculate the volume content and slenderness ratio;Based on the volume content and slenderness ratio, and the normal stress and cohesive force of un-reinforced soil, the initial equivalent normal stress and initial equivalent cohesive force of fiber reinforced soil are calculated;The initial equivalent normal stress and initial equivalent cohesive force are corrected to obtain the actual equivalent normal stress and actual equivalent cohesive force, and then the equivalent shear strength of fiber reinforced soil is calculated. Thus, in the related art, the situation that the shear strength of reinforced soil body is not considered in the case of fiber excess, and too many parameters are set in the calculation method, which is difficult to calibrate, and it is difficult to provide beneficial guidance for actual engineering design and other problems.

Description

TECHNICAL FIELD

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

[0002] As a new type of geosynthetic material, fiber is increasingly applied in geotechnical engineering construction. As a physical improvement method for soil, fiber reinforcement forms a composite reinforced body with soil after being mixed into the soil, and a three-dimensional network structure is formed inside the soil, which effectively improves the shear resistance of the soil. The fiber-fiber, fiber-soil particle and soil particle-soil particle in the composite reinforced body form a special load transfer path, which cooperatively bears external load. It can be seen that the influence of fiber on the shear strength of soil is not only related to the friction, pressure, tension and interlocking force generated when the fiber bends or interweaves, but also related to the formation of the three-dimensional network space constraint.

[0003] In the related art, a fiber with a wave shape can be mixed into soil for soil improvement, and by stirring, a proper amount of water is sprinkled into the soil and compacted into a sample, thereby obtaining a wave-shaped fiber reinforced soil, and then calculating the shear strength thereof; the dimensional influence can be removed, and a function of the cohesion of the reinforced soil and the fiber length, fiber content and fiber diameter is established, thereby obtaining a shear strength model, and in the model establishment process, regression analysis is performed through test data.

[0004] However, in the related art, the research focus is concentrated on the comparison of test phenomena and the explanation of mechanism, without considering the case that the excess of fiber causes the shear strength of the reinforced soil to attenuate, and there are too many parameters set in the calculation method, which is difficult to calibrate, and it is difficult to provide beneficial guidance for actual engineering design, and improvement is urgently needed. SUMMARY

[0005] The present application provides a method and device for calculating equivalent shear strength of fiber reinforced soil, to solve the problems in the related art that the research focus is concentrated on the comparison of test phenomena and the explanation of mechanism, without considering the case that the excess of fiber causes the shear strength of the reinforced soil to attenuate, and there are too many parameters set in the calculation method, which is difficult to calibrate, and it is difficult to provide beneficial guidance for actual engineering design.

[0006] The first aspect embodiment of the present application provides a fiber reinforced soil equivalent shear strength calculation method, including 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, and the normal stress and cohesion of the un-reinforced soil body; 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, 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 the 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 un-reinforced soil body, it further includes: obtaining the initial shear strength of the un-reinforced soil body; and obtaining the normal stress and cohesion of the un-reinforced soil body based on the initial shear strength.

[0008] Optionally, in one embodiment of the present application, 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, it further includes: judging whether the volume content and the slenderness ratio meet a preset condition; if the volume content and the slenderness ratio meet the preset condition, allowing the initial equivalent normal stress and the initial equivalent cohesion to be corrected, otherwise, not allowing the initial equivalent normal stress and the initial equivalent cohesion to be corrected.

[0009] Optionally, in one embodiment of the present application, the 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 to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber reinforced soil includes: determining the internal friction angle of the fiber reinforced soil based on the internal friction angle of the un-reinforced soil body; 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; and 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 formula for calculating the actual equivalent normal stress can be, but is not limited to:

[0011]

[0012] The formula for calculating the actual equivalent cohesion may be, but is not limited to, the following:

[0013]

[0014] Where, χ f η is the fiber volume content. f α1 and α2 are experimental parameters, where α is the fiber slenderness ratio and δ is the fiber length ratio. th For all trials, χ² f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 c is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

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

[0016]

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

[0018] A second aspect of this application provides a device for calculating the equivalent shear strength of fiber-reinforced soil, comprising: a first acquisition module, configured 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, configured 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; and a first generation module, configured 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 this application, it further includes: a second acquisition module, configured to acquire 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, as well as the normal stress and cohesion of the unreinforced soil; and a second generation module, configured to obtain the normal stress and cohesion of the unreinforced soil based on the initial shear strength.

[0020] Optionally, in one embodiment of this application, it further includes: a judgment module, configured to determine 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; and a correction module, configured to allow correction of the initial equivalent normal stress and the initial equivalent cohesion when the volume content and the slenderness ratio meet the preset conditions, otherwise not allow correction of the initial equivalent normal stress and the initial equivalent cohesion.

[0021] Optionally, in one embodiment of this application, the first generation module includes: a determining unit, configured to determine the internal friction angle of the fiber-reinforced soil based on the internal friction angle of the unreinforced soil; an obtaining unit, configured to obtain the measured equivalent normal stress and measured equivalent cohesion of the fiber-reinforced soil by combining the volume content, the slenderness ratio, and the internal friction angle; a first generation unit, configured 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; and a second generation unit, configured 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 this application, the formula for calculating the actual equivalent normal stress may be, but is not limited to, the following:

[0023]

[0024] The formula for calculating the actual equivalent cohesion may be, but is not limited to, the following:

[0025]

[0026] Among them, X f η is the fiber volume content. f α1 and α2 are experimental parameters, where α is the fiber slenderness ratio and δ is the fiber length ratio. th For all trials, χ² f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 c is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

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

[0028]

[0029] in, The internal friction angle of the 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 equivalent shear strength calculation method of the fiber reinforced soil as described in the above embodiments.

[0031] The fourth aspect of the present application provides a computer readable storage medium, which stores a computer program executable by a processor to implement the equivalent shear strength calculation method of the fiber reinforced soil as described above.

[0032] The fifth aspect of the present application provides a computer program product comprising a computer program executable to implement the equivalent shear strength calculation method of the fiber reinforced soil as described above.

[0033] The embodiments 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 obtained, 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 un-reinforced soil body, 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, so as to finally realize the calculation of the equivalent shear strength of the fiber reinforced soil, which can accurately predict the enhanced and attenuated shear strength of the fiber reinforced soil throughout the whole process. In addition, the fiber reinforced soil calculation mechanics of the embodiments of the present application is clear in concept, easy to apply, and reliable in result, which solves the problems of complex shear strength calculation of the fiber reinforced soil and low reliability, and provides an effective calculation method for the actual engineering design of the fiber reinforced soil. Thus, the problems in the related art that the research focus is concentrated on the comparison of test phenomena and the explanation of mechanism, the attenuation of the shear strength of the reinforced soil body caused by excessive fiber is not considered, too many parameters are set in the calculation method, it is difficult to calibrate, and it is difficult to provide beneficial guidance for the actual engineering design are solved.

[0034] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

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

[0036] Figure 1 A block schematic diagram of the stress of the fiber reinforced soil unit body according to one embodiment of the present application is shown;

[0037] Figure 2 A block schematic diagram of the stress-strain relationship of the fiber reinforced soil and the un-reinforced soil body in the indoor triaxial compression test according to one embodiment of the present application is shown;

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

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

[0040] Figure 4 (a) a block diagram showing the change of equivalent cohesion under the influence of different fiber volume contents according to an embodiment of the present application;

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

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

[0043] Figure 6 a block diagram showing the relationship between the product of fiber volume content and fiber slenderness ratio and the ratio of equivalent cohesion of fiber reinforced soil to that of un-reinforced soil and the calculated values according to an embodiment of the present application;

[0044] Figure 7 a diagram showing the relationship between the test data of equivalent cohesion and the predicted values according to an embodiment of the present application;

[0045] Figure 8 a block diagram showing the relationship between the product of fiber volume content and fiber slenderness ratio and the ratio of equivalent normal stress of fiber reinforced soil to that of un-reinforced soil and the calculated values according to an embodiment of the present application;

[0046] Figure 9 a diagram showing the relationship between the test data of equivalent normal stress and the predicted values according to an embodiment of the present application;

[0047] Figure 10 (a) a diagram showing the comparison between the measured values and the predicted values of fiber slenderness ratio of 181.82 according to an embodiment of the present application;

[0048] Figure 10 (b) a diagram showing the comparison between the measured values and the predicted values of fiber slenderness ratio of 272.73 according to an embodiment of the present application;

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

[0050] Figure 11 A flow chart of a fiber reinforced soil equivalent shear strength calculation method provided according to an embodiment of the present application;

[0051] Figure 12 A flow chart of the working principle of a fiber reinforced soil equivalent shear strength calculation method provided according to an embodiment of the present application;

[0052] Figure 13 A block schematic diagram of a fiber reinforced soil equivalent shear strength calculation device provided according to an embodiment of the present application;

[0053] Figure 14 A structural schematic diagram of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0054] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are examples for explaining the present application and are not intended to be limiting of the present application.

[0055] The fiber reinforced soil equivalent shear strength calculation method and device of the embodiments of the present application are described below with reference to the accompanying drawings. In view of the fact that the research focus in the background art mentioned above is concentrated on the comparison of test phenomena and the explanation of mechanism, the attenuation of the shear strength of the reinforced soil caused by the excess of fibers is not considered, and too many parameters are set in the calculation method, which is difficult to calibrate and is difficult to provide beneficial guidance for actual engineering design, the present application provides a fiber reinforced soil equivalent shear strength calculation method. In the method, the volume content and the 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 obtained, and then the initial equivalent normal stress and the initial equivalent cohesion of the fiber reinforced soil are calculated in combination with the normal stress and the cohesion of the un-reinforced soil body, and the initial equivalent normal stress and the initial equivalent cohesion are corrected to obtain the actual equivalent normal stress and the actual equivalent cohesion of the fiber reinforced soil, and finally the calculation of the equivalent shear strength of the fiber reinforced soil is realized, which can accurately predict the reinforced and attenuated shear strength of the fiber reinforced soil throughout the process. In addition, the fiber reinforced soil calculation mechanics concept of the embodiments of the present application is clear, easy to apply, and the result is reliable, which solves the problem of complex calculation of the shear strength of the fiber reinforced soil and low reliability, and provides an effective calculation method for the actual engineering design of the fiber reinforced soil. Thus, the problems in the related art, such as the fact that the research focus is concentrated on the comparison of test phenomena and the explanation of mechanism, the attenuation of the shear strength of the reinforced soil caused by the excess of fibers is not considered, and too many parameters are set in the calculation method, which is difficult to calibrate and is difficult to provide beneficial guidance for actual engineering design, are solved.

[0056] Before introducing the fiber reinforced soil equivalent shear strength calculation method proposed in the embodiments of the present application, the related concepts involved in the embodiments of the present application are introduced.

[0057] As shown in Figure 1 , the tensile strength of the soil body itself is very small, while the tensile strength of the fiber is relatively large. When the fiber reinforced soil is subjected to triaxial shear, the shear stress is transmitted to the fiber through the soil-fiber interface, and tensile stress is generated in the fiber. Since the fiber has high tensile strength, the fiber reinforced soil can withstand higher shear stress than the un-reinforced soil body. At this time, the stress transmission is largely dependent on the friction characteristics of the soil-fiber interface. In addition, in the fiber reinforced soil, the fibers are intertwined through many intersection points to form a three-dimensional network structure in the soil body. When the fiber reinforced soil is subjected to shear stress, the fiber tends to pull the intertwined fiber through the intersection points 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 fiber tends to gather soil particles together through the intertwined network structure, and this effect is equivalent to cohesion, which is the main cause of the cohesive resistance of the fiber reinforced soil.

[0058] As shown in Figure 2As shown in the embodiments of this application, before the axial strain of triaxial compression shear reaches 4%, the deviatoric stress of fiber-reinforced soil and the deviatoric stress of unreinforced soil have similar growth trends. However, after the axial strain continues to increase to 4%, the deviatoric stress of fiber-reinforced soil continues to increase, and its trend is strain hardening type; while the deviatoric stress of unreinforced soil gradually decreases, and its trend is strain softening type.

[0059] like Figure 3 As shown, in this embodiment, a fiber length of 0 represents unreinforced soil. With the same fiber volume content, cohesion increases with increasing fiber length; however, the internal friction angle does not change significantly with increasing fiber length. This is because longer fibers are more likely to form an interwoven fiber network, thereby enhancing the soil's cohesion.

[0060] like Figure 4 As shown in the embodiments of this application, a fiber volume content of 0 indicates unreinforced soil. Under the same fiber length, cohesion first increases and then decreases with increasing fiber volume content; however, the internal friction angle does not increase significantly with increasing fiber volume content. This is because excessive fiber generates more fiber-fiber contact, which reduces the interlocking ability between soil particles, thus leading to decreased cohesion.

[0061] like Figure 5 As shown, the embodiments of this application are derived from... Figure 3 (b) and Figure 4 (b) The results show that the ratio of the equivalent tangential internal friction angle of fiber-reinforced soil to that of unreinforced soil increases with χ. f ·η f The increase in ...

[0062] like Figure 6 As shown in the embodiments of this application, under the same fiber volume content, the ratio of the cohesion of fiber-reinforced soil to that of unreinforced soil varies with χ. f ·η f The strength initially increases and then decreases with increasing fiber content. This is because as fiber content increases, more fibers form a denser fibrous network that encapsulates soil particles, thus increasing cohesion. However, excessive fibers generate more fiber-fiber contact, which reduces the interlocking ability between soil particles, leading to decreased cohesion.

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

[0064] like Figure 8As shown, the ratio of the normal stress of the fiber-reinforced soil to the soil without reinforcement also increases first and then decreases with the increase of χ f ·η f This is because with the increase of fiber content, more fibers will form a denser fiber network structure to wrap the soil particles, thereby causing the equivalent normal stress to increase. However, excessive fibers will produce more fiber-fiber contact, which will block the effective stress transmission between the fibers and the soil particles, thereby causing the equivalent normal stress to decrease.

[0065] As shown in Figure 9 , the equivalent normal stress values obtained by the calculation method proposed in the embodiment of the present application are compared with the equivalent normal stress values obtained by the test, and the regression result shows that the difference between them is very small, and the calculation method of the embodiment of the present application is effective.

[0066] As shown in Figure 10 , the equivalent shear strength values of the fiber-reinforced soil obtained by the calculation method proposed in the embodiment of the present application are compared with the shear strength values obtained by the test. The comparison result shows that the embodiment of the present application can better consider the characteristics of the loss of soil shear strength caused by excessive fibers, further verifying the reliability of the calculation method.

[0067] Specifically, Figure 11 is a flowchart of a fiber-reinforced soil equivalent shear strength calculation method provided according to the embodiment of the present application.

[0068] As shown in Figure 11 , the fiber-reinforced soil equivalent shear strength calculation method includes the following steps:

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

[0070] In the actual execution process, in order to calculate the volume content and slenderness ratio of the target fiber in the fiber-reinforced soil, the length, diameter and content of the target fiber can be obtained first, and the volume content and slenderness ratio thereof are calculated based on the obtained length, diameter and content of the target fiber by using formula (1)-formula (3). The expression of formula (1)-formula (3) in the embodiment of the present application can be but is not limited to:

[0071]

[0072] Wherein, χ f is the fiber volume content, V is the volume of the reinforced soil, V f is the fiber volume, m f is the fiber mass, ρ f is the fiber density, η fL is a fiber length f D is a fiber length f D is a fiber length

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

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

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

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

[0077]

[0078] Optionally, in an 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, the embodiment of the present application further includes: judging whether the volume content and the slenderness ratio meet a preset condition; if the volume content and the slenderness ratio meet the preset condition, allowing the initial equivalent normal stress and the initial equivalent cohesion to be corrected, otherwise not allowing the initial equivalent normal stress and the initial equivalent cohesion to be corrected.

[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 judge whether the volume content and the slenderness ratio meet a certain condition.

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

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

[0082] The certain conditions can be an excess of the volume content and the slenderness ratio, which can be set by a person skilled in the art according to actual conditions, and the present application does not make specific limitations.

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

[0084] It can be understood that the fiber-reinforced soil of the embodiments of the present application is a composite reinforced soil body, and the single fiber is flexible. When the surrounding soil particles extrude the fiber, the fiber will be twisted and bent, and then when the fiber-reinforced soil is subjected to shear action, the tensile stress generated in the bent fiber will generate a normal stress at the soil-fiber contact, which is called equivalent normal stress, which 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, mainly improving the cohesion of the fiber-reinforced soil, which is called equivalent cohesion, which can be expressed as: c a,eq .

[0085] According to the above definitions of the equivalent normal stress σ n,eq and the equivalent cohesion c a,eq , the equivalent shear strength of the fiber-reinforced soil can be obtained, which can be but not limited to expressed as:

[0086]

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

[0088] Further, the embodiments of the present application can be combined with test results, and it can be known that the internal friction angle of the un-reinforced soil is basically equal to the internal friction angle of the fiber-reinforced soil , so the equivalent shear strength of the fiber-reinforced soil can be but not limited to expressed as:

[0089]

[0090] Further, the embodiments of the present application assume that the equivalent normal stress σ n,eq and the equivalent cohesion ca,eq It is the product of fiber volume content and fiber slenderness ratio, χ. f ·η f The function includes the normal stress σ0 and cohesion c0 of the unreinforced soil, wherein the initial equivalent normal stress and initial equivalent cohesion in the embodiments of this application can be, but are not limited to, expressed as:

[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] Where α1 and α2 are experimental parameters.

[0094] It should be noted that equations (8) and (9) in the embodiments of this application can only calculate the shear strength as a function of x. f ·η f The stage where the shear strength increases monotonically due to the increase in fiber density cannot be calculated, as it is the stage where the shear strength decreases due to excessive fiber density.

[0095] It can be understood that the embodiments of this application use equations (8) and (9) to calculate the initial equivalent normal stress and initial equivalent cohesion of fiber-reinforced soil. As can be seen from the above analysis, in the stage where the shear strength is reduced due to excessive fibers, the calculation of equivalent normal stress and equivalent cohesion by equations (8) and (9) will fail. Furthermore, in order to realize the calculation of the loss of equivalent shear strength caused by excessive fibers in fiber-reinforced soil, the embodiments of this application introduce a Gaussian mapping function in equations (8) and (9) to describe the strength reduction of fiber-reinforced soil.

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

[0097] As one possible approach, embodiments of this application can correct the initial equivalent normal stress and initial equivalent cohesion based on the measured equivalent normal stress and measured equivalent cohesion of the fiber-reinforced soil, respectively, to obtain the actual equivalent normal stress and 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 this application embodiment is low-plasticity clay with a maximum dry density of 1.98 g·cm³.-3 The liquid limit is 25.67%, the plastic limit is 17.56%, and the optimum water content is 12.55%.

[0099] Further, the prepared material is prepared into a fiber-reinforced soil sample according to the Soil Test Method Standard GB / T50123-2019, the sample is loaded according to the triaxial compression test, and stress-strain curves of the fiber-reinforced soil and the unreinforced soil body under different confining pressures 50kPa, 100kPa, 200kPa and 300kPa are obtained.

[0100] Optionally, in an 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 body; 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 can 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] wherein 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 f ·η f of all tests, β1 and β2 are test parameters, σ n,0 is the normal stress of the unreinforced soil body, and c0 is the cohesion of the unreinforced soil body.

[0105] As a possible implementation manner, the internal friction angle of the fiber-reinforced soil can be determined based on the internal friction angle of the unreinforced soil body, and then the measured equivalent normal stress and the measured equivalent cohesion of the fiber-reinforced soil are obtained in combination with the volume content, the slenderness ratio and the internal friction angle, and then the actual equivalent normal stress and the actual equivalent cohesion of the fiber-reinforced soil are obtained.

[0106] Exemplarily, the embodiment of the present application introduces Gaussian mapping functions in formula (8) and formula (9) to describe the strength degradation of the fiber reinforced soil, and then formula (8) and formula (9) can be rewritten in the form of formula (10) and formula (11), which can be but not limited to expressed as:

[0107]

[0108] wherein β1 and β2 are test parameters, δ th is the maximum value corresponding to the optimal fiber content of all tests. f ·η f is the maximum value corresponding to the optimal fiber content of all tests.

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

[0110]

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

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

[0113]

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

[0115] For example, according to the stress-strain values obtained above, the actual cohesion, the actual normal stress and the internal friction angle of the shear strength are determined by taking the deviatoric stress corresponding to the axial strain of 20%, and the initial equivalent shear strength is determined by formula (7).

[0116] Further, the embodiment of the present application determines parameters α1, α2, β1, β2 and δ th by fitting the test data under different known test conditions through formula (10) and formula (11), and after data fitting, α1 of the 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 formula (10) and formula (11) into formula (7), the expression (12) for calculating the final equivalent shear strength of the polypropylene fiber reinforced soil can be obtained.

[0117] The working principle of the equivalent shear strength calculation method of the fiber reinforced soil according to the embodiments of the present application is described in detail below in combination with a specific embodiment.

[0118] Embodiment one:

[0119] Step S1201: selecting a target fiber and calculating the volume content and slenderness ratio of the target fiber.

[0120] In the embodiments of the present application, the target fiber selected is a polypropylene fiber, the density of which is generally 0.91 g·cm -3 -1, the average diameter is 33 (generally between 18 μm and 48 μm, which is not specifically limited in the present application) μm, the length is 6 mm, 9 mm and 12 mm respectively, the volume content is calculated by formula (1) and formula (2), the calculation results are 0.59%, 1.19%, 1.78% and 2.37% respectively, and the slenderness ratio is calculated by formula (3), the calculation results are 181.82, 272.73 and 363.64 respectively, and the polypropylene fiber has good dispersibility in the soil body.

[0121] Step S1202: selecting a soil sample.

[0122] In the embodiments of the present application, the soil sample selected is low plastic clay, the maximum dry density is 1.98 g·cm -3 -1, the liquid limit is 25.67%, the plastic limit is 17.56%, and the optimum water content is 12.55%.

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

[0124] In the embodiments of the present application, the prepared material is prepared into a fiber reinforced soil sample according to the “Standard for Soil Test Methods” GB / T50123-2019, the sample is loaded according to the triaxial compression test, and the stress-strain curves of the fiber reinforced soil and the unreinforced soil body under different confining pressures 50 kPa, 100 kPa, 200 kPa and 300 kPa test conditions are obtained.

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

[0126] In the embodiments of the present application, the actual cohesion, the actual normal stress and the internal friction angle of the shear strength are determined according to the stress-strain values obtained above, the stress corresponding to the axial strain of 20% is taken, and the initial equivalent shear strength is determined by formula (7).

[0127] Step S1205: obtaining the related test parameter values.

[0128] In this embodiment of the application, experimental data under known test conditions are fitted using equations (10) and (11) to determine parameters α1, α2, β1, β2 and δ. th After data fitting, the values ​​of α1, α2, β1, and β2 for polypropylene fiber reinforced soil were found to be 3.50, 0.40, 0.05, and 0.06, respectively, with δ... th It is 6.47.

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

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

[0131] The method for calculating the equivalent shear strength of fiber-reinforced soil proposed in this application can calculate the volume content and slenderness ratio of the target fibers based on the obtained length, diameter, and content of the fiber-reinforced soil. Then, combined with the normal stress and cohesion of the unreinforced soil, the initial equivalent normal stress and initial equivalent cohesion of the fiber-reinforced soil are calculated. These initial equivalent normal stress and initial equivalent cohesion are then corrected to obtain the actual equivalent normal stress and actual equivalent cohesion of the fiber-reinforced soil, ultimately realizing the calculation of the equivalent shear strength of the fiber-reinforced soil. This method can accurately predict the enhanced and diminished shear strength of the fiber-reinforced soil throughout the entire process. Furthermore, the computational mechanics concepts for fiber-reinforced soil in this application are clear, easy to apply, and the results are reliable. It solves the problems of complex and unreliable calculations of the shear strength of fiber-reinforced soil, providing an effective calculation method for the practical engineering design of fiber-reinforced soil. This solves the problems in related technologies, such as the research focus being on the comparison of experimental phenomena and the explanation of mechanisms, without considering the reduction in shear strength of reinforced soil caused by excessive fiber, and the calculation methods having too many parameters, making calibration difficult and failing to provide useful guidance for practical engineering design.

[0132] Next, referring to the accompanying drawings, a device for calculating the equivalent shear strength of fiber-reinforced soil according to an embodiment of this application is described.

[0133] Figure 13 This is a block diagram of a device for calculating the equivalent shear strength of fiber-reinforced soil according to an embodiment of this application.

[0134] like Figure 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 the target fiber in the fiber-reinforced soil, and to calculate the volume content and slenderness ratio of the target fiber based on the length, diameter and content of the target fiber.

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

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

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

[0139] The second acquisition module is used to acquire 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, slenderness ratio, normal stress, and cohesion of the unreinforced soil.

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

[0141] Optionally, in one embodiment of this application, it further includes a determination module and a correction module.

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

[0143] The correction module allows for correction of the initial equivalent normal stress and initial equivalent cohesion when the volume content and slenderness ratio meet preset conditions; otherwise, correction of the initial equivalent normal stress and initial equivalent cohesion is not allowed.

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

[0145] Among them, the determining unit is used to determine the internal friction angle of fiber-reinforced soil based on the internal friction angle of unreinforced soil.

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

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

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

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

[0150]

[0151] The formula for calculating the actual equivalent cohesion can be, but is not limited to, the following:

[0152]

[0153] Where, χ f η is the fiber volume content. f α1 and α2 are experimental parameters, where α is the fiber slenderness ratio and δ is the fiber length ratio. th For all trials, χ² f ·η f The maximum value corresponding to the optimal fiber content, β1 and β2 are experimental parameters, σ n,0 c is the normal stress of the unreinforced soil, and c0 is the cohesion of the unreinforced soil.

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

[0155]

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

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

[0158] The fiber reinforced soil equivalent shear strength calculation device provided by the embodiment of the 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 of the fiber reinforced soil obtained, 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 body, 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, so as to finally realize the calculation of the equivalent shear strength of the fiber reinforced soil, and accurately predict the enhanced shear strength and attenuated shear strength of the fiber reinforced soil in the whole process. In addition, the fiber reinforced soil calculation mechanics provided by the embodiment of the application is clear in concept, convenient to apply and reliable in result, solves the problems of complex shear strength calculation of the fiber reinforced soil and low reliability, and provides an effective calculation method for the actual engineering design of the fiber reinforced soil. Therefore, the problems in the related art, such as the focus on the comparison of test phenomena and the explanation of mechanism, the failure to consider the attenuation of the shear strength of the reinforced soil body caused by excessive fibers, too many parameters set in the calculation method, the difficulty in calibration, and the difficulty in providing beneficial guidance for the actual engineering design, are solved.

[0159] Figure 14 A structural schematic diagram of an electronic device provided by the embodiment of the application is shown. The electronic device can include:

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

[0161] The processor 1402 implements the fiber reinforced soil equivalent shear strength calculation method provided in the above embodiment when executing the program.

[0162] Further, the electronic device further includes:

[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 the computer program executable on the processor 1402.

[0165] The memory 1401 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, 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 with each other through a bus and complete communication between 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, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 14 Only one thick line is used to represent the bus in the figure, but it 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 complete communication between each other through an internal interface.

[0168] The processor 1402 can 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] The embodiments of the present application further provide a computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the above-mentioned equivalent shear strength calculation method of fiber reinforced soil.

[0170] The embodiments of the present application further provide a computer program product, comprising a computer program, which, when executed by a processor, implements the above-mentioned equivalent shear strength calculation method of fiber reinforced soil.

[0171] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, the usage of "N" means at least two, for example, two, three or the like, unless explicitly stated otherwise.

[0172] Furthermore, the terms "first", "second", or the like, are used merely as a designation of certain elements or features of the application, and do not imply or connote relative importance or a specific order of precedence. Thus, features defined with "first", "second", etc. can include at least one of the features, either explicitly or implicitly.

[0173] Any process or method descriptions or blocks in flow charts or otherwise described herein represent embodiments of modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions or steps, and alternate implementations are possible. In some embodiments, the processes or methods described in flow charts or otherwise described herein are not necessarily performed in the order shown or discussed, including, for example, performing or depending from other operations or stages, in parallel, in reverse order, or in other orders.

[0174] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of executable instructions stored in a computer readable medium, which can be executed by an instruction execution system, apparatus or device, such as a computer-based system, a processor-based system, or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or a combination of the above. For the purposes of this specification, a "computer readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus or device. The computer readable medium can be a computer readable storage medium or a computer readable signal medium. The computer readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a propagation medium. The computer readable signal medium can include, but is not limited to, a computer readable medium that facilitates transfer of the program from one place to another. A specific example of a computer readable medium is a non-transitory computer-readable storage medium. A specific example of a computer readable signal medium is a source or destination of the computer readable medium. Another specific example of a computer readable signal medium is a computer readable signal travelling through space. Thus, a computer readable medium can take many forms of hardware to carry out the program for use by or in connection with the instruction execution system, apparatus or device.

[0175] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware and in another embodiment, the hardware can be implemented using any or a combination of the following technologies, which are each well known in the art: a discrete logic circuit(s) having logic gates for implementing logic functions upon an application of data signals, an application specific integrated circuit having appropriate combinational logic gates, a programmable gate array(s) (PGA), a field programmable gate array (FPGA), etc.

[0176] Those of skill in the art would understand that the steps carried out by the above-mentioned embodiments can be implemented by a program instructing the relevant hardware to complete all or part of the steps, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiments or a combination thereof.

[0177] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0178] The storage medium mentioned above can 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 should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for calculating equivalent shear strength of a fiber reinforced soil, characterized by, The method comprises 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, and the normal stress and cohesion of the unreinforced soil body; 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; wherein the calculation formula of the actual equivalent normal stress is: ， the calculation formula of the actual equivalent cohesion is: ， wherein, is the fiber volume content, is the fiber aspect ratio, and is the test parameter, is the maximum value corresponding to the optimal fiber content for all tests, is the maximum value corresponding to the optimal fiber content for all tests, and is the test parameter, is the normal stress of the unreinforced soil body, is the cohesion of the unreinforced soil body.

2. The method of claim 1, wherein, Before calculating the initial equivalent normal stress and the 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 body, the method further comprises: obtaining the initial shear strength of the unreinforced soil body; obtaining the normal stress and cohesion of the unreinforced soil body based on the initial shear strength.

3. The method of claim 1, wherein, 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, the method further comprises: determining whether the volume content and the slenderness ratio meet a preset condition; if the volume content and the slenderness ratio meet the preset condition, allowing the initial equivalent normal stress and the initial equivalent cohesion to be corrected, otherwise, not allowing the initial equivalent normal stress and the initial equivalent cohesion to be corrected.

4. The method of claim 1, wherein, The method of 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 body; 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.

5. The method of claim 1, wherein, The calculation formula of the final equivalent shear strength is: ， wherein, is the internal friction angle of the un-reinforced soil.

6. A device for calculating equivalent shear strength of a fiber reinforced soil, characterized by comprising: a device for calculating equivalent shear strength of a fiber reinforced soil according to any one of claims 1 to 5. The method comprises: an obtaining module, configured 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 calculating module, configured 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 body; The generating module is configured 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 actual equivalent normal stress and actual equivalent cohesion of the fiber reinforced soil, and to calculate a final equivalent shear strength of the fiber reinforced soil based on the actual equivalent normal stress and the actual equivalent cohesion. The calculation formula of the actual equivalent normal stress is: ， The calculation formula of the actual equivalent cohesion is: ， wherein, is the fiber volume content, is the fiber aspect ratio, and is the test parameter, is the maximum value corresponding to the optimal fiber content for all tests, is the maximum value corresponding to the optimal fiber content for all tests, and is the test parameter, is the normal stress of the unreinforced soil body, is the cohesion of the unreinforced soil body.

7. An electronic device, comprising: The calculation formula of the actual equivalent normal stress is: The computer program is stored in the memory and executable on the processor, and the processor executes the program to implement the fiber reinforced soil equivalent shear strength calculation method according to any one of claims 1-5.

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

9. A computer program product, characterised in that, The computer program is executed to implement the fiber reinforced soil equivalent shear strength calculation method according to any one of claims 1-5.

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