Method and device for evaluating slope stability based on point safety factor of slopes using oblique strip method

Abstract

The present invention provides a method and device for evaluating slope stability based on a point safety factor of an inclined strip division method, which relates to the technical field of slope management, including dividing the sliding body of a slope into a plurality of inclined strip blocks; traversing upward from the inclined strip block at the bottom of the slope, and calculating the point safety factor of each inclined strip block according to a shear strength parameter; when the point safety factor of the traversed inclined strip block is less than a preset threshold, calculating the support force required when the point safety factor of the inclined strip block is equal to the preset threshold; calculating the point safety factor after providing the support force for the next traversal of the inclined strip block according to the shear strength parameter, and when the point safety factors of all inclined strip blocks are calculated, judging whether the point safety factor of the inclined strip block at the top of the slope is greater than the preset threshold: if so, the overall safety factor of the landslide is calculated based on the point safety factors of each inclined strip block. The present invention obtains the spatial sliding mechanism of the landslide by analyzing the distribution law of the point safety factors, and then performs targeted support and protection.

Description

Technical Field

[0001] The present invention relates to the technical field of slope management, in particular to a method and device for evaluating slope stability based on a point safety factor of an oblique strip method. Background Art

[0002] As engineering construction enters more complex geological conditions, we face an increasing number and complexity of engineering landslides. Simultaneously, changes in natural environmental conditions are leading to the resurgence of natural landslides, which have become increasingly hazardous. Statistics show that large-scale landslides have occurred almost annually since the 1980s, and this trend has intensified year by year. Frequent landslides have caused significant casualties and property damage. Against the backdrop of the continuous expansion of my country's transportation infrastructure, the prevalence of high and steep slopes has become a significant challenge. Accurately analyzing the stability of these slopes is crucial for determining the necessary types of engineering measures. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and device for evaluating slope stability based on the point safety factor of the oblique strip method to improve the above-mentioned problem. To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows:

[0004] In a first aspect, the present application provides a method for evaluating slope stability using a point safety factor based on the oblique strip method, comprising:

[0005] Obtaining the shear strength parameters of the slope, dividing the sliding body of the slope into a plurality of inclined strips, wherein the inclined strips are inclined from the bottom of the slope to the top of the slope;

[0006] Starting from the inclined bar at the bottom of the slope, the slope is traversed upwards, and the point safety factor of each inclined bar is calculated based on the shear strength parameter; when the point safety factor of the traversed inclined bar is less than a preset threshold, the support force required to make the point safety factor of the inclined bar equal to the preset threshold is calculated, and the support force is provided by the next traversed inclined bar;

[0007] The point safety factor after the next traversal of the inclined bars to provide support force is calculated based on the shear strength parameter. When the point safety factors of all inclined bars are calculated, it is determined whether the point safety factor of the inclined bars at the top of the slope is greater than the preset threshold:

[0008] If so, the overall safety factor of the landslide is calculated based on the point safety factors of each inclined strip;

[0009] Otherwise, the shear strength parameter is expanded according to a preset ratio, and the point safety factor of each inclined strip is recalculated using the expanded shear strength parameter until the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold;

[0010] Based on the strength reduction method, the overall safety factor of the landslide is calculated using the point safety factor of each inclined strip when the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold.

[0011] In a second aspect, the present application also provides a device for evaluating slope stability based on a point safety factor using a diagonal strip method, comprising:

[0012] A division module; obtaining the shear strength parameter of the slope, and dividing the sliding body of the slope into a plurality of inclined strips, wherein the inclined strips are inclined from the bottom of the slope to the top of the slope;

[0013] Traversal module: Starting from the inclined bar at the bottom of the slope, traverse upwards and calculate the point safety factor of each inclined bar based on the shear strength parameter; when the point safety factor of the traversed inclined bar is less than the preset threshold, calculate the support force required to make the point safety factor of the inclined bar equal to the preset threshold, and the support force is provided by the next traversed inclined bar;

[0014] The first calculation module: Calculate the point safety factor after the next traversal of the inclined bars to provide support force based on the shear strength parameter. When the point safety factors of all inclined bars are calculated, determine whether the point safety factor of the inclined bars at the top of the slope is greater than the preset threshold:

[0015] The second calculation module: if yes, then the overall safety factor of the landslide is calculated based on the point safety factors of each inclined strip;

[0016] Correction module: Otherwise, the shear strength parameter is expanded according to the preset ratio, and the point safety factor of each inclined strip is recalculated using the expanded shear strength parameter until the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold;

[0017] The third calculation module: Based on the strength reduction method, the overall safety factor of the landslide is calculated using the point safety factor of each inclined bar when the point safety factor of the inclined bar at the top of the slope is equal to the preset threshold.

[0018] In a third aspect, the present application also provides a device for evaluating slope stability using a point safety factor based on the oblique strip method, comprising:

[0019] memory for storing computer programs;

[0020] A processor is used to implement the steps of the method for evaluating slope stability by using a point safety factor based on the oblique strip method when executing the computer program.

[0021] In a fourth aspect, the present application also provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned method for evaluating slope stability using a point safety factor based on the oblique strip method.

[0022] The beneficial effects of the present invention are:

[0023] This method divides the slope sliding mass into oblique bars and sequentially calculates the point safety factor and sliding force of each oblique bar under its own weight and / or inter-bar forces. It then takes a weighted average of the product of the sliding force and the point safety factor for each oblique bar to calculate the overall safety factor of the landslide. This fully utilizes the inter-bar forces and more accurately reflects the stress distribution within the slope under actual conditions. By analyzing the distribution of the point safety factors, the present invention derives the spatial sliding mechanism of the landslide, enabling targeted support and protection measures. The overall safety factor can also be used to evaluate the overall stability of the landslide.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 Schematic diagram of the flow of the method for evaluating slope stability by point safety factor based on the oblique strip method according to an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of force analysis of the oblique bar i in Example 1 of the present invention;

[0028] Figure 3 Schematic diagram of the force analysis of the oblique bar i+1 in Example 1 of the present invention Figure 1 ;

[0029] Figure 4 Schematic diagram of the force analysis of the oblique bar i+1 in Example 1 of the present invention Figure 2 ;

[0030] Figure 5 This is a schematic diagram of landslide segments described in Example 2 of the present invention;

[0031] Figure 6 This is a schematic diagram of the safety factor of a landslide point described in Example 2 of the present invention;

[0032] Figure 7 Schematic diagram of the structure of a device for evaluating slope stability using a point safety factor based on the oblique strip method according to an embodiment of the present invention;

[0033] Figure 8 Schematic diagram of the structure of the equipment for evaluating slope stability using a point safety factor based on the oblique strip method described in an embodiment of the present invention.

[0034] 800. Slope stability evaluation device using point safety factor based on oblique strip method; 801. Processor; 802. Memory; 803. Multimedia component; 804. I / O interface; 805. Communication component. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0037] Example 1:

[0038] This embodiment provides a method for evaluating slope stability using a point safety factor based on the oblique strip method. The basic assumptions of this embodiment are as follows:

[0039] a. Treat the slope stability problem as a plane strain problem;

[0040] b. The slider is subjected to a tangential force Ti parallel to the sliding surface and a normal pressure perpendicular to the sliding surface;

[0041] c. The sliding body is considered an ideal rigid body and does not deform during the force analysis process. Once the shear stress on the sliding surface reaches the shear strength of the sliding body material, the sliding body begins to shear along the sliding surface.

[0042] d. The failure of the sliding surface is based on the Mohr-Coulomb strength criterion;

[0043] e. The normal force and tangential force between the inclined bars are numerically proportional to each other on the inclined surface.

[0044] f. The static equilibrium condition is satisfied along the entire sliding surface, but the moment equilibrium condition is not satisfied;

[0045] The calculation method of the present invention comprises the following steps:

[0046] See also Figure 1 、 Figure 2 , the figure shows that the method includes:

[0047] S1. Obtain the shear strength parameters of the slope. Divide the sliding mass of the slope into n inclined bars, which are inclined from the bottom of the slope to the top. Specifically, the inclined bars are numbered from the bottom of the slope, i.e., the inclined bar at the bottom of the slope is numbered 1, and the inclined bar at the top of the slope is numbered n. The shear strength parameters include the cohesion c and the internal friction angle of the sliding surface.

[0048] Based on the above embodiment, the method further includes:

[0049] S2. Starting from the slope bottom, the inclined strips are traversed upwards, and the point safety factor of each inclined strip is calculated based on the shear strength parameter; when the point safety factor of the traversed inclined strip is less than the preset threshold, the support force required when the point safety factor of the inclined strip is equal to the preset threshold is calculated, and the support force is provided by the next inclined strip traversed;

[0050] Specifically, step S2 includes:

[0051] S21. Perform force analysis on the first traversed inclined bar, which is the inclined bar at the bottom of the slope. In this embodiment, the force on the first inclined bar includes the vertical downward gravity W1;

[0052] S22. Calculate the normal pressure and sliding force of the first inclined strip under its own gravity based on the initial shear strength:

[0053]

[0054] Where E1, N1 and α1 represent the sliding force, normal pressure and sliding surface angle of the first inclined block, respectively.

[0055] S23. Calculate the point safety factor F of the first inclined bar based on the positive pressure and the sliding force s1 :

[0056]

[0057] Where l1 represents the sliding surface length of the first inclined bar, and c represents the cohesion of the sliding surface.

[0058] Specifically, the step S2 further includes:

[0059] S21. When the point safety factor of the traversed i-th oblique bar is less than the preset threshold, the force analysis of the traversed oblique bar is performed to establish the oblique bar under the support force and self-weight W i Under the static equilibrium model, the support force includes the tangential force X i and the normal force Y i In this embodiment, the support force on the i-th oblique bar is provided by the i+1-th oblique bar, and the preset threshold is 1. Figure 2 shown.

[0060] S22. Based on the static equilibrium model, a sliding force calculation model and a positive pressure calculation model of the inclined strips are established according to the initial shear strength coefficient;

[0061]

[0062] Where, E i 、N i They represent the sliding force and normal pressure of the i-th inclined block, α i , β i denote the sliding surface inclination angle and the inclination angle of the i-th inclined stripe respectively;

[0063] S23. Use the sliding force calculation model and the normal pressure calculation model of the inclined strip to construct a point safety factor calculation model:

[0064]

[0065] Where, l i represents the sliding surface length of the i-th inclined bar, F si Represents the safety factor of the i-th inclined bar point.

[0066] S24. Obtain the numerical relationship between the tangential force and the normal force, substitute the numerical relationship into the point safety factor calculation model, and calculate the tangential force and normal force required for the oblique bar when the point safety factor of the oblique bar is equal to the preset threshold;

[0067] Specifically, the numerical relationship between the tangential force and the normal force is:

[0068] Y i =λX i ;(5)

[0069] Wherein, λ represents the proportional coefficient, which is determined according to the properties of the rock and soil mass. Preferably, λ = 0.5;

[0070] make It can be calculated that:

[0071]

[0072] Among them, ζ1 and ζ2 are calculation parameters, and their expressions are:

[0073]

[0074] Based on the above embodiment, the method further includes:

[0075] S3. Calculate the point safety factor after the next traversal of the support force provided by the inclined strip i+1 based on the shear strength parameter. When the point safety factors of all inclined strips are calculated, determine whether the point safety factor of the inclined strip at the top of the slope is greater than the preset threshold:

[0076] For details, please refer to Figure 3 , the step S3 comprises:

[0077] S31. Perform stress analysis on the current inclined strips, based on the initial shear strength, self-weight W i+1 and the support force provided, calculate the normal pressure and sliding force of the current inclined bar;

[0078] Specifically, the positive pressure E of the i+1th oblique bar i+1 and the sliding force N i+1 for:

[0079]

[0080] Where, α i+1 and β i+1 are the sliding surface inclination angle and the inclination angle of the i+1th oblique strip, respectively.

[0081] S32. Calculate the point safety factor F of the current inclined bar based on the positive pressure and the sliding force s(i+1) :

[0082]

[0083] Where, l i+1 represents the sliding surface length of the i+1th oblique bar.

[0084] S33. If the point safety factor of the current inclined bar is less than the preset value 1, establish a static equilibrium model of the current inclined bar under its own gravity, support force, and its supporting force. Figure 4 ;

[0085] S34. Based on the static equilibrium model, establish the current inclined strip block sliding force calculation model E' according to the initial shear strength coefficient i+1 and positive pressure calculation model N′ i+1 ;

[0086] E′ i+1 =Wi+1 sinα i+1 +X i sin(α i+1 +β i+1 )+Y i cos(α i+1 +

[0087] β i+1 )-X i+1 sin(α i+1 +β i+1 )-Y i+1 cos(α i+1 +β i+1 );(10)

[0088] Where, X i+1 and Y i+1 represents the tangential force and normal force on the i+1th inclined bar;

[0089] N′ i+1 =W i+1 cosα i+1 +X i cos(α i+1 +β i+1 )+Y i sin(α i+1 +

[0090] β i+1 )-X i+1 cos(α i+1 +β i+1 )+Y i+1 sin(α i+1 +β i+1 );(11)

[0091] S35. Use the current inclined strip sliding force calculation model and the normal pressure calculation model to construct a point safety factor calculation model:

[0092]

[0093] S36. Substitute the numerical relationship into the point safety factor calculation model, and when the point safety factor of the inclined bar is equal to a preset threshold, calculate the tangential force and normal force required for the inclined bar.

[0094] when When , the tangential force and normal force on the i+1th inclined bar are calculated as follows:

[0095]

[0096] Among them, ′ 1.ζ ′ 2 and ζ′ 3 represents the calculation coefficient, and its expression is:

[0097]

[0098] Based on the above embodiment, the method further includes:

[0099] If so, calculate the overall safety factor of the landslide based on the point safety factor of each inclined strip. s :

[0100]

[0101] Where, F si represents the point safety factor of the i-th inclined bar, E i Represents the sliding force of the i-th inclined bar.

[0102] Based on the above embodiment, the method further includes:

[0103] S5. Otherwise, the shear strength parameter is expanded according to a preset ratio, and the point safety factor of each diagonal strip is recalculated using the expanded shear strength parameter until the point safety factor of the diagonal strip at the top of the slope is equal to the preset threshold;

[0104] In this embodiment, since the point safety factor of the slope top slant bar is less than the preset threshold, it means that the slope top slant bar cannot stabilize itself. However, since the landslide is in a stable state as a whole, the slope top slant bar must be in a stable state. Therefore, the shear strength parameter needs to be corrected so that the point safety factor of the slope top slant bar is equal to 1.

[0105] Specifically, step S5 includes:

[0106] S51. Increase the tangent value of the internal friction angle and the cohesion of the rock and soil by the first ratio k1, i.e. c′=k1c,

[0107] S52. Traverse each diagonal bar block in turn, perform stress analysis on each diagonal bar block, and recalculate the point safety factor of each diagonal bar block using the expanded shear strength parameter. Specifically, repeat steps S2-S3 to calculate the point safety factors of all diagonal bar blocks.

[0108] S53. Determine whether the point safety factor of the slope top slant bar is equal to the preset threshold:

[0109] If so, the final point safety factor of each oblique bar is obtained;

[0110] S54. Otherwise, the tangent value of the expanded internal friction angle and the cohesion of the rock and soil mass are further expanded by a second ratio k2, ie, c″=k2c′.

[0111] The point safety factor of each inclined bar is repeatedly calculated using the expanded shear strength parameter until the point safety factor of the inclined bar at the top of the slope is equal to the preset threshold value 1. Specifically, when the tangent value of the internal friction angle and the cohesion of the rock and soil are expanded m times, the point safety factor of the inclined bar at the top of the slope is equal to the preset threshold value 1.

[0112] Based on the above embodiment, the method further includes:

[0113] S6. Based on the strength reduction method, the overall safety factor of the landslide is calculated using the point safety factor of each inclined strip when the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold.

[0114] Specifically, step S6 includes:

[0115] S61. Calculate the reduction factor based on the ratio of the shear strength parameter expansion;

[0116] Specifically, obtain the expansion ratio of shear strength parameters, such as k1, k2...k m , then the reduction factor The calculation formula is:

[0117]

[0118] S62. Perform a weighted summation of the product of the sliding force of each inclined bar and its point safety factor to obtain a first sum value;

[0119] S63. Calculate the sum of the sliding forces of each inclined bar to obtain a second sum;

[0120] S64. Calculate the overall safety factor F′ of the landslide based on the reduction factor, the first sum value, and the second sum value. s :

[0121]

[0122] The overall safety factor F′ calculated at this time s is the adjusted overall safety factor.

[0123] Example 2

[0124] This example calculates and analyzes the cohesion c and internal friction angle of a slope in its natural state and under rainstorm conditions. As shown in Table 1:

[0125] Table 1

[0126]

[0127] See also Figure 5, the slider of the slope is divided into 11 inclined bars, and the inclined bars are numbered from the bottom to the top. The point safety factor of each inclined bar is calculated in turn using the method provided in Example 1. The calculation results are as follows: Figure 6 According to the point safety factor of each inclined strip, the overall safety factor of the slope in the natural state and saturated state is calculated, and the results are shown in Table 2:

[0128] Table 2

[0129] state Overall safety factor State of Nature 1.109 Saturation 1.037

[0130] In order to verify the applicability of this method in calculating the overall stability of the slope, the MP method and the Spencer method were used to calculate the overall safety factor of the slope in the natural state and the saturated state. The results are shown in Table 3:

[0131] Table 3

[0132] Calculation method State of Nature Saturation MP method 1.090 1.010 Spencer Method 1.115 1.033

[0133] As can be seen from Table 3, the calculation results of the method proposed in this embodiment are basically the same as those of the Spencer method and the MP method, and meet the calculation accuracy requirements. Therefore, the point safety factor calculation method proposed in this embodiment is suitable for calculating the overall safety factor of the slope.

[0134] Example 3:

[0135] like Figure 7 As shown, this embodiment provides a device for evaluating slope stability based on a point safety factor of the oblique strip method, the device comprising:

[0136] A division module; obtaining the shear strength parameter of the slope, and dividing the sliding body of the slope into a plurality of inclined strips, wherein the inclined strips are inclined from the bottom of the slope to the top of the slope;

[0137] Traversal module: Starting from the inclined bar at the bottom of the slope, traverse upwards and calculate the point safety factor of each inclined bar based on the shear strength parameter; when the point safety factor of the traversed inclined bar is less than the preset threshold, calculate the support force required to make the point safety factor of the inclined bar equal to the preset threshold, and the support force is provided by the next traversed inclined bar;

[0138] The first calculation module: Calculate the point safety factor after the next traversal of the inclined bars to provide support force based on the shear strength parameter. When the point safety factors of all inclined bars are calculated, determine whether the point safety factor of the inclined bars at the top of the slope is greater than the preset threshold:

[0139] The second calculation module: if yes, then the overall safety factor of the landslide is calculated based on the point safety factors of each inclined strip;

[0140] Correction module: Otherwise, the shear strength parameter is expanded according to the preset ratio, and the point safety factor of each inclined strip is recalculated using the expanded shear strength parameter until the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold;

[0141] The third calculation module: Based on the strength reduction method, the overall safety factor of the landslide is calculated using the point safety factor of each inclined bar when the point safety factor of the inclined bar at the top of the slope is equal to the preset threshold.

[0142] Based on the above embodiment, the traversal module includes:

[0143] The first analysis unit performs a force analysis on the first inclined bar block traversed, where the first inclined bar block is the inclined bar block at the bottom of the slope;

[0144] The first calculation unit: calculates the normal pressure and sliding force of the first inclined bar under the action of its own gravity based on the initial shear strength;

[0145] The second calculation unit calculates the point safety factor of the first oblique bar based on the normal pressure and the sliding force.

[0146] Based on the above embodiment, the traversal module further includes:

[0147] The second analysis unit performs a force analysis on the traversed oblique bars and establishes a static equilibrium model of the oblique bars under the support force and self-weight, wherein the support force includes a tangential force and a normal force;

[0148] The first establishing unit is configured to establish a sliding force calculation model and a normal pressure calculation model of the inclined strip block based on the static equilibrium model and the initial shear strength coefficient;

[0149] The second building unit: using the sliding force calculation model and the normal pressure calculation model of the inclined strip block to build a point safety factor calculation model;

[0150] The third calculation unit obtains the numerical relationship between the tangential force and the normal force, substitutes the numerical relationship into the point safety factor calculation model, and calculates the tangential force and normal force required by the oblique bar when the point safety factor of the oblique bar is equal to a preset threshold.

[0151] Based on the above embodiment, the first calculation module includes:

[0152] The third analysis unit: performs force analysis on the current inclined strip, and calculates the normal pressure and sliding force of the current inclined strip according to the initial shear strength, self-gravity and the provided support force;

[0153] A fourth calculation unit is configured to calculate a point safety factor of the current inclined bar based on the normal pressure and the sliding force;

[0154] The third establishing unit: if the point safety factor of the current inclined bar block is less than the preset value, establish a static equilibrium model of the current inclined bar block after being subjected to its own gravity, support force and the support force provided by it;

[0155] The fourth establishing unit: based on the static equilibrium model, establishes a sliding force calculation model and a normal pressure calculation model of the current oblique strip according to the initial shear strength coefficient;

[0156] The fifth building unit: constructing a point safety factor calculation model using the current sliding force calculation model and the normal pressure calculation model of the inclined strip;

[0157] Substitution unit: Substitute the numerical relationship into the point safety factor calculation model, and when the point safety factor of the inclined bar is equal to a preset threshold, calculate the tangential force and normal force required by the inclined bar.

[0158] Based on the above embodiment, the correction module includes:

[0159] The first correction unit: the tangent value of the internal friction angle and the cohesion of the rock and soil mass are expanded by a first ratio;

[0160] The fifth calculation unit: traverses each inclined bar block in turn, performs a stress analysis on each inclined bar block, and recalculates the point safety factor of each inclined bar block using the expanded shear strength parameter;

[0161] Judgment unit: judge whether the point safety factor of the slope top slant block is equal to the preset threshold:

[0162] If so, the final point safety factor of each oblique bar is obtained;

[0163] Second correction unit: Otherwise, the tangent value of the expanded internal friction angle and the cohesion of the rock and soil are expanded again by a second ratio, and the point safety factor of each inclined bar is repeatedly calculated using the expanded shear strength parameter until the point safety factor of the inclined bar at the top of the slope is equal to the preset threshold.

[0164] Based on the above embodiment, the third calculation module includes:

[0165] The sixth calculation unit: calculate the reduction factor according to the ratio of shear strength parameter expansion;

[0166] The seventh calculation unit: performing weighted summation on the product of the sliding force of each inclined bar and its point safety factor to obtain a first sum value;

[0167] An eighth calculation unit: calculating the sum of the sliding forces of the inclined bars to obtain a second sum value;

[0168] Calculation Unit 9: Calculate the overall safety factor of the landslide based on the reduction factor, the first sum value and the second sum value.

[0169] It should be noted that, regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0170] Example 4:

[0171] Corresponding to the above method embodiment, this embodiment also provides a device for evaluating slope stability based on a point safety factor of the oblique strip method. The device for evaluating slope stability based on a point safety factor of the oblique strip method described below and the method for evaluating slope stability based on a point safety factor of the oblique strip method described above can be referred to each other.

[0172] Figure 8 FIG. 8 is a block diagram of a device 800 for evaluating slope stability using a point safety factor based on a slant strip method according to an exemplary embodiment. Figure 8 As shown, the device 800 for evaluating slope stability using a point safety factor based on the oblique strip method may include: a processor 801 and a memory 802. The device 800 may also include one or more of a multimedia component 803, an I / O interface 804, and a communication component 805.

[0173] The processor 801 is used to control the overall operation of the device 800 for evaluating slope stability using a point safety factor based on the oblique strip method, so as to complete all or part of the steps in the aforementioned method for evaluating slope stability using a point safety factor based on the oblique strip method. The memory 802 is used to store various types of data to support the operation of the device 800. This data may include, for example, instructions for any application or method operating on the device 800, as well as application-related data, such as contact information, sent and received messages, images, audio, video, and the like. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 803 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 802 or transmitted via the communication component 805. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 804 provides an interface between the processor 801 and other interface modules, and the above-mentioned other interface modules can be a keyboard, a mouse, buttons, etc. These buttons can be virtual buttons or physical buttons. The communication component 805 is used for wired or wireless communication between the slope stability evaluation device 800 based on the oblique strip method and other devices. Wireless communication, such as Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 805 can include: Wi-Fi module, Bluetooth module, NFC module.

[0174] In an exemplary embodiment, the device 800 for evaluating slope stability by using a point safety factor based on the oblique strip method can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned method for evaluating slope stability by using a point safety factor based on the oblique strip method.

[0175] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided. When executed by a processor, the program instructions implement the steps of the aforementioned method for evaluating slope stability using a point safety factor based on the oblique strip method. For example, the computer-readable storage medium may be the aforementioned memory 802 including the program instructions. The program instructions may be executed by the processor 801 of the device 800 for evaluating slope stability using a point safety factor based on the oblique strip method to implement the aforementioned method for evaluating slope stability using a point safety factor based on the oblique strip method.

[0176] Example 5:

[0177] Corresponding to the above method embodiment, this embodiment further provides a readable storage medium. The readable storage medium described below and the above-described method for evaluating slope stability using a point safety factor based on the oblique strip method can refer to each other.

[0178] A readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for evaluating slope stability by using a point safety factor based on the oblique strip method in the above-mentioned method embodiment.

[0179] The readable storage medium may specifically be any readable storage medium that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0180] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0181] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for evaluating slope stability using a point safety factor based on the oblique strip method, characterized in that: include: Obtaining the shear strength parameters of the slope, dividing the sliding body of the slope into a plurality of inclined strips, wherein the inclined strips are inclined from the bottom of the slope to the top of the slope; Starting from the inclined bar at the bottom of the slope, the slope is traversed upwards, and the point safety factor of each inclined bar is calculated based on the shear strength parameter; when the point safety factor of the traversed inclined bar is less than a preset threshold, the support force required to make the point safety factor of the inclined bar equal to the preset threshold is calculated, and the support force is provided by the next traversed inclined bar; The point safety factor after the next traversal of the inclined bars to provide support force is calculated based on the shear strength parameter. When the point safety factors of all inclined bars are calculated, it is determined whether the point safety factor of the inclined bars at the top of the slope is greater than the preset threshold: If so, the overall safety factor of the landslide is calculated based on the point safety factors of each inclined strip; Otherwise, the shear strength parameter is expanded according to a preset ratio, and the point safety factor of each inclined strip is recalculated using the expanded shear strength parameter until the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold; Based on the strength reduction method, the overall safety factor of the landslide is calculated by using the point safety factor of each inclined strip when the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold. When the point safety factor of the traversed oblique bar is less than a preset threshold, the support force required when the point safety factor of the oblique bar is equal to the preset threshold is calculated, including: Performing force analysis on the traversed oblique bars and establishing a static equilibrium model of the oblique bars under support force and self-weight, wherein the support force includes tangential force and normal force; Based on the static equilibrium model, a sliding force calculation model and a normal pressure calculation model of the inclined strip are established according to the initial shear strength coefficient; The point safety factor calculation model is constructed using the sliding force calculation model and the normal pressure calculation model of the inclined strip; Obtaining the numerical relationship between the tangential force and the normal force, substituting the numerical relationship into a point safety factor calculation model, and calculating the tangential force and normal force required for the oblique bar when the point safety factor of the oblique bar is equal to a preset threshold; The point safety factor after the next traversal of the inclined strips to provide support force is calculated based on the shear strength parameters, including: Perform force analysis on the current inclined strips and calculate the normal pressure and sliding force of the current inclined strips based on the initial shear strength, self-gravity and the support force provided; Calculate the point safety factor of the current inclined bar based on the normal pressure and the sliding force; If the point safety factor of the current inclined bar is less than the preset value 1, a static equilibrium model of the current inclined bar is established after it is subjected to its own gravity, support force, and its supporting force; The point safety factor calculation model is constructed using the current sliding force calculation model and normal pressure calculation model of the inclined strip; Substituting the numerical relationship into the point safety factor calculation model, and setting the point safety factor of the oblique bar block equal to a preset threshold, the tangential force and normal force required by the oblique bar block are calculated.

2. The method for evaluating slope stability by using a point safety factor based on the oblique strip method according to claim 1 is characterized in that , starting from the inclined strip at the bottom of the slope and traversing upwards, calculate the point safety factor of each inclined strip according to the shear strength parameters, including: Performing a force analysis on the first inclined bar block traversed, where the first inclined bar block is the inclined bar block at the bottom of the slope; Calculate the normal pressure and sliding force of the first inclined strip under the action of its own weight based on the initial shear strength; The point safety factor of the first oblique bar is calculated based on the normal pressure and the sliding force.

3. The method for evaluating slope stability by using a point safety factor based on the oblique strip method according to claim 1 is characterized in that , expand the shear strength parameters according to a preset ratio, and recalculate the point safety factor of each inclined strip block using the expanded shear strength parameters until the point safety factor of the inclined strip block at the top of the slope is equal to the preset threshold. The shear strength parameters include the cohesion and internal friction angle of the rock and soil mass, including: Expand the tangent of the internal friction angle and the cohesion of the rock and soil mass by a first ratio; Traverse each inclined bar block in turn, perform stress analysis on each inclined bar block, and recalculate the point safety factor of each inclined bar block using the expanded shear strength parameters; Determine whether the point safety factor of the slope top slant block is equal to the preset threshold: If so, the final point safety factor of each oblique bar is obtained; Otherwise, the tangent value of the expanded internal friction angle and the cohesion of the rock and soil are expanded again by a second ratio, and the point safety factor of each inclined bar is repeatedly calculated using the expanded shear strength parameter until the point safety factor of the inclined bar at the top of the slope is equal to the preset threshold.

4. The method for evaluating slope stability by using a point safety factor based on the oblique strip method according to claim 3 is characterized in that ,Based on the strength reduction method, the overall safety factor of the landslide is calculated by using the point safety factor of each inclined strip when the point safety factor of the slope top is equal to the preset threshold, including: The reduction factor is calculated based on the ratio of shear strength parameter expansion; The first sum value is obtained by weighted summing the product of the sliding force of each inclined bar and its point safety factor; Calculate the sum of the sliding forces of each inclined bar to obtain the second sum value; The overall safety factor of the landslide is calculated based on the reduction factor, the first sum value and the second sum value.

5. A device for evaluating slope stability based on the point safety factor of the oblique strip method, characterized in that: include: Divide modules; Obtaining the shear strength parameters of the slope, dividing the sliding body of the slope into a plurality of inclined strips, wherein the inclined strips are inclined from the bottom of the slope to the top of the slope; Traversal module: Starting from the inclined bar at the bottom of the slope, traverse upwards and calculate the point safety factor of each inclined bar based on the shear strength parameter; when the point safety factor of the traversed inclined bar is less than the preset threshold, calculate the support force required to make the point safety factor of the inclined bar equal to the preset threshold, and the support force is provided by the next traversed inclined bar; The first calculation module: Calculate the point safety factor after the next traversal of the inclined bars to provide support force based on the shear strength parameter. When the point safety factors of all inclined bars are calculated, determine whether the point safety factor of the inclined bars at the top of the slope is greater than the preset threshold: The second calculation module: if yes, then the overall safety factor of the landslide is calculated based on the point safety factors of each inclined strip; Correction module: Otherwise, the shear strength parameter is expanded according to the preset ratio, and the point safety factor of each inclined strip is recalculated using the expanded shear strength parameter until the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold; The third calculation module: Based on the strength reduction method, the overall safety factor of the landslide is calculated by using the point safety factor of each inclined strip when the point safety factor of the inclined strip at the top of the slope is equal to the preset threshold; Wherein, the traversal module further includes: The second analysis unit performs a force analysis on the traversed oblique bars and establishes a static equilibrium model of the oblique bars under the support force and self-weight, wherein the support force includes a tangential force and a normal force; The first establishing unit is configured to establish a sliding force calculation model and a normal pressure calculation model of the inclined strip block based on the static equilibrium model and the initial shear strength coefficient; The second building unit: using the sliding force calculation model and the normal pressure calculation model of the inclined strip block to build a point safety factor calculation model; The third calculation unit is configured to obtain a numerical relationship between the tangential force and the normal force, substitute the numerical relationship into a point safety factor calculation model, and calculate the tangential force and normal force required by the oblique bar when the point safety factor of the oblique bar is equal to a preset threshold; The first calculation module includes: Perform force analysis on the current inclined strips and calculate the normal pressure and sliding force of the current inclined strips based on the initial shear strength, self-gravity and the support force provided; Calculate the point safety factor of the current inclined bar based on the normal pressure and the sliding force; If the point safety factor of the current inclined bar is less than the preset value 1, a static equilibrium model of the current inclined bar is established after it is subjected to its own gravity, support force, and its supporting force; The point safety factor calculation model is constructed using the current sliding force calculation model and normal pressure calculation model of the inclined strip; Substituting the numerical relationship into the point safety factor calculation model, and setting the point safety factor of the oblique bar block equal to a preset threshold, the tangential force and normal force required by the oblique bar block are calculated.

6. The device for evaluating slope stability by using a point safety factor based on the oblique strip method according to claim 5, characterized in that: The traversal module includes: The first analysis unit performs a force analysis on the first inclined bar block traversed, where the first inclined bar block is the inclined bar block at the bottom of the slope; The first calculation unit: calculates the normal pressure and sliding force of the first inclined bar under the action of its own gravity based on the initial shear strength; The second calculation unit calculates the point safety factor of the first oblique bar based on the normal pressure and the sliding force.

7. The device for evaluating slope stability by point safety factor based on the oblique strip method according to claim 5, characterized in that: The correction module includes: The first correction unit: the tangent value of the internal friction angle and the cohesion of the rock and soil mass are expanded by a first ratio; The fifth calculation unit: traverses each inclined bar block in turn, performs a stress analysis on each inclined bar block, and recalculates the point safety factor of each inclined bar block using the expanded shear strength parameter; Judgment unit: judge whether the point safety factor of the slope top slant block is equal to the preset threshold: If so, the final point safety factor of each oblique bar is obtained; Second correction unit: Otherwise, the tangent value of the expanded internal friction angle and the cohesion of the rock and soil are expanded again by a second ratio, and the point safety factor of each inclined bar is repeatedly calculated using the expanded shear strength parameter until the point safety factor of the inclined bar at the top of the slope is equal to the preset threshold.

8. The device for evaluating slope stability by using a point safety factor based on the oblique strip method according to claim 7, characterized in that: The third calculation module includes: The sixth calculation unit: calculate the reduction factor according to the ratio of shear strength parameter expansion; The seventh calculation unit: performing weighted summation on the product of the sliding force of each inclined bar and its point safety factor to obtain a first sum value; An eighth calculation unit: calculating the sum of the sliding forces of the inclined bars to obtain a second sum value; Calculation Unit 9: Calculate the overall safety factor of the landslide based on the reduction factor, the first sum value and the second sum value.

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