Pole tower footing slope stability limit balance evaluation method under lightning impulse condition

Abstract

The invention discloses a tower footing side slope stability limit balance evaluation method under a lightning impulse condition, which comprises the following steps of: simulating a lightning stroke side slope tower test in a laboratory by inputting a potential sliding surface parameter and a rock-soil body material parameter of a certain side slope; calculating to obtain a conversion coefficient of the stress variation of the potential sliding surface of the side slope and heat generated by lightning impulse current, and further obtaining a calculation formula of the stress variation value of the potential sliding surface of the tower footing side slope of the tower under the lightning impulse condition, and taking the stress variation value of the potential sliding surface of the tower footing side slope of the tower under the lightning impulse condition as an input parameter; according to the method, the stability safety coefficient of the slope is calculated, the stability of the tower footing slope under the lightning impulse condition is evaluated according to the stability safety coefficient, accurate evaluation of the stability of the tower footing slope under the condition that the lightning impulse influences the stability of the tower footing slope is achieved, and the accuracy of slope stability analysis under the extreme weather condition is improved.

Description

Technical Field

[0001] The invention relates to the technical field of slope engineering safety assessment, and in particular to a limit equilibrium assessment method for the stability of a tower base slope under lightning impulse conditions. Background Art

[0002] Slope stability analysis is an important means to detect the stability of slopes and prevent slope landslides. Through a systematic analysis of multiple factors such as the geological structure of the slope, rock and soil characteristics, hydrological conditions, and external loads, the stability of the slope under different working conditions can be understood. This slope stability analysis is not a simple qualitative judgment, but involves complex mechanical models and mathematical calculations. It can predict the potential risk of slope landslides in advance and quantify this risk. This provides a key basis for taking targeted preventive measures, allowing us to take effective intervention measures before the slope shows signs of danger, such as reinforcing the slope, setting up drainage systems, adjusting load distribution, etc., thereby greatly reducing the possibility of slope landslides. In many engineering fields, such as mining, water conservancy projects, and construction projects, slope stability analysis is an important guarantee to ensure the safe and smooth progress of the project.

[0003] However, traditional slope stability analysis methods have limitations. Although these methods take into account factors such as the geometric shape of the slope, the physical and mechanical properties of the rock and soil, and the influence of groundwater, they do not take into account the impact of natural factors such as lightning strikes on slope stability. In particular, when there are poles and towers on the slope, the slope of the pole base under lightning strike conditions may cause a series of physical changes. For example, the current flowing through the pole resistance will generate heat, causing the temperature around the tower base to rise and causing slope stress changes, which will reduce the stability of the pole base slope. Since lightning strikes on slope poles and towers are a random and unpredictable natural phenomenon, their impact on slope stability is also relatively complex. Therefore, a method for analyzing the stability of the pole base slope under lightning strike conditions is needed to make up for the shortcomings of existing methods. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the influence of the slope on the tower pole is not fully considered, and the accuracy of the slope stability analysis under extreme weather conditions is low. The purpose is to provide a limit equilibrium assessment method for the stability of the tower base slope under lightning impulse conditions. By inputting the potential sliding surface parameters of a certain slope and the material parameters of the rock and soil body, a lightning strike slope tower test is simulated in the laboratory, and the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is calculated, and then a calculation formula for the stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is obtained. The stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is used as an input parameter to calculate the stability safety factor of the slope, and the stability of the tower base slope under lightning impulse conditions is evaluated according to the stability safety factor, thereby achieving an accurate assessment of the stability of the tower base slope under the influence of lightning impulses, and improving the accuracy of the slope stability analysis under extreme weather conditions.

[0005] The present invention is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a method for evaluating the limit equilibrium of a tower base slope stability under lightning impulse conditions, comprising the following specific steps:

[0007] Obtain the potential sliding surface parameters of the target slope and the material parameters of the rock and soil mass, and build a lightning-struck slope tower model;

[0008] Based on the lightning-struck slope tower model, the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is calculated;

[0009] Based on the conversion coefficient, a calculation function for the stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is constructed;

[0010] The potential sliding surface stress change value of the tower base slope under lightning impulse condition is obtained as the input parameter of the calculation function to obtain the stability safety factor of the slope;

[0011] According to the stability safety factor s Assess the stability of the tower base slope under lightning impulse conditions.

[0012] Furthermore, the potential sliding surface parameters of the slope include: the potential sliding surface area of ​​the slope and the angle between the potential sliding surface and the horizontal direction;

[0013] The rock and soil material parameters include: cohesion, original internal friction angle and original normal stress.

[0014] Furthermore, the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is calculated based on the lightning-struck slope tower model, specifically including:

[0015] Based on the lightning-struck slope tower model, the instantaneous value of the lightning current at the time, the tower grounding resistance and the lightning strike duration are obtained, and the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistance is obtained;

[0016] During a lightning strike, the stress change value of the potential sliding surface of the slope is obtained in real time. Combined with the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistor, the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is obtained.

[0017] Furthermore, the step of calculating the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistor includes:

[0018]

[0019] Where Q represents the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistance, i(t) represents the instantaneous value of the lightning current at time t, R represents the tower grounding resistance, and t represents the duration of the lightning strike.

[0020] Furthermore, the calculation step of the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current includes:

[0021]

[0022] Among them, △σ represents the stress change value of the potential sliding surface of the slope, k represents the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current, i(t) represents the instantaneous value of the lightning current at time t, R represents the grounding resistance of the tower, and t represents the duration of the lightning strike.

[0023] Furthermore, the calculation formula for the stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is constructed based on the conversion coefficient, which specifically includes:

[0024]

[0025] Among them, △σ represents the stress change value of the potential sliding surface of the slope, k represents the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current, i(t) represents the instantaneous value of the lightning current at time t, R represents the grounding resistance of the tower, and t represents the duration of the lightning strike.

[0026] Furthermore, the step of obtaining the potential sliding surface stress change value of the tower base slope under lightning impulse conditions as an input parameter of the calculation formula to obtain the stability safety factor of the slope includes:

[0027] The limit equilibrium method is used to analyze the stability of the tower base slope under lightning impulse conditions. The stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is used as the input parameter. Based on the limit equilibrium method, the stability safety factor of the slope is obtained.

[0028] Furthermore, based on the limit equilibrium method, the stability safety factor of the slope is obtained. The specific steps include:

[0029] Obtain the normal stress of the slope stress without any change, and obtain the corrected normal stress;

[0030] Based on the corrected normal stress, the force generated by the corrected normal stress is obtained;

[0031] Obtain the shear stress on the potential sliding surface of the slope when lightning impulse conditions are not considered, and obtain the corrected shear stress;

[0032] Based on the corrected shear stress, the force generated by the corrected shear stress is obtained;

[0033] Based on the force generated by the corrected normal stress and the force generated by the corrected shear stress, the anti-sliding force and the sliding force are obtained respectively;

[0034] Based on the anti-sliding force and sliding force, the stability safety factor of the tower base slope under lightning impulse conditions is determined.

[0035] Furthermore, the specific calculation steps of the slope stability safety factor include:

[0036] When the normal stress of the potential sliding surface of the slope changes, the corrected normal stress σ n1 for:

[0037] σ n1 =σ n0 +Δσcosθ

[0038] When the slope tower is not struck by lightning, the shear stress t0 on the potential sliding surface of the slope is:

[0039] τ0=σ n0 tanθ

[0040] The corrected shear stress τ1 is:

[0041] τ1=τ0+Δσsinθ

[0042] The force N′ generated by the corrected normal stress is:

[0043] N′=σ n1 A

[0044] The force T' generated by the corrected shear stress is:

[0045] T′=τ1A

[0046] Calculate the anti-slip force and sliding force:

[0047]

[0048] Sliding force = T'

[0049] Safety factor F of the stability of the tower base slope under lightning impulse conditions s for:

[0050]

[0051] Among them, σ n0 represents the initial normal stress, that is, the normal stress on the potential sliding surface of the slope without external force, Δσ represents the stress change, which represents the change of normal stress caused by lightning strike, θ represents the sliding surface inclination, that is, the inclination angle of the potential sliding surface of the slope, A represents the area of ​​the potential sliding surface of the slope, represents the internal friction angle, which is used to affect the magnitude of the anti-slip force, and c0 represents the cohesion.

[0052] Furthermore, the stability of the tower base slope under lightning impulse conditions is evaluated according to the stability safety factor, and the specific steps include:

[0053] The stability safety factor F of the tower base slope under lightning impulse conditions s >When the threshold is set, the slope is in a stable state;

[0054] The stability safety factor F of the tower base slope under lightning impulse conditions s =When the threshold is set, the slope is in the limit equilibrium state;

[0055] The stability safety factor F of the tower base slope under lightning impulse conditions s When the threshold is less than the set value, the slope is in an unstable state.

[0056] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0057] By inputting the parameters of the potential sliding surface of a certain slope and the material parameters of the rock and soil, the lightning strike on the slope tower test was simulated in the laboratory, and the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current was calculated. Then, the calculation formula for the stress change value of the potential sliding surface of the tower base slope under the condition of lightning impulse was obtained. The stress change value of the potential sliding surface of the tower base slope under the condition of lightning impulse was taken as the input parameter to calculate the stability safety factor of the slope. The stability of the tower base slope under the condition of lightning impulse was evaluated according to the stability safety factor, which achieved an accurate evaluation of the stability of the tower base slope under the influence of lightning impulse, and improved the accuracy of slope stability analysis under extreme weather conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the exemplary 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 should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0059] Figure 1 It is a flow chart of the stability analysis of the tower base slope under lightning impulse conditions in an embodiment of the present invention;

[0060] Figure 2 It is a structural diagram of an experimental device for analyzing the stability of a tower base slope under lightning impulse conditions in an embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0062] As a possible implementation, Figure 1 and Figure 2 As shown, this embodiment provides a method for evaluating the limit equilibrium of the slope stability of a tower base under lightning impulse conditions, including the following specific steps:

[0063] Obtain the potential sliding surface parameters of the target slope and the material parameters of the rock and soil mass, and build a lightning-struck slope tower model;

[0064] Based on the lightning-struck slope tower model, the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is calculated;

[0065] Based on the conversion coefficient, a calculation function for the stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is constructed;

[0066] The potential sliding surface stress change value of the tower base slope under lightning impulse condition is obtained as the input parameter of the calculation function to obtain the stability safety factor of the slope;

[0067] According to the stability safety factor s Assess the stability of the tower base slope under lightning impulse conditions.

[0068] This embodiment can achieve accurate assessment of the stability of the tower base slope under conditions affected by lightning strikes, and improve the accuracy of slope stability analysis under extreme weather conditions.

[0069] In some possible implementations, the potential sliding surface of the slope can be determined based on the geometric shape and position of the slope tower base to determine the impact area of ​​the tower base slope under lightning strike conditions, thereby determining the potential sliding surface of a slope.

[0070] In some possible implementations, the potential sliding surface parameters of the slope include: the potential sliding surface area of ​​the slope and the angle between the potential sliding surface and the horizontal direction; the rock and soil material parameters include: cohesion, original internal friction angle and original normal stress; the specific parameter values ​​are shown in Table 1:

[0071] Table 1

[0072]

[0073] In some possible implementations, based on the lightning-struck slope tower model, the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is calculated, specifically including:

[0074] Based on the lightning-struck slope tower model, the instantaneous value of the lightning current at the time, the tower grounding resistance and the lightning strike duration are obtained, and the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistance is obtained. The calculation steps include:

[0075]

[0076] Where Q represents the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistance, i(t) represents the instantaneous value of the lightning current at time t, R represents the tower grounding resistance, and t represents the duration of the lightning strike.

[0077] During the lightning strike, the pressure sensor is used to measure the stress change value of the potential sliding surface of the slope in real time. Combined with the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistor, the conversion coefficient of the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is obtained. The calculation steps include:

[0078]

[0079] Specifically, the lightning current waveform function applied in this embodiment is:

[0080]

[0081] The lightning current action time is 2×10 -6 s, the tower grounding resistance is 10Ω, and the stress change value is 2.98kPa.

[0082] Substituting the above conditions into the formula, we can obtain k=0.25.

[0083] Based on the theories of thermodynamics and elastic mechanics, the calculation formula for the stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is obtained;

[0084]

[0085] Among them, △σ represents the stress change value of the potential sliding surface of the slope, k represents the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current, i(t) represents the instantaneous value of the lightning current at time t, R represents the grounding resistance of the tower, and t represents the duration of the lightning strike.

[0086] In some possible implementations, the stress change value of the potential sliding surface of the slope is measured by a pressure sensor.

[0087] In some possible implementations, i(t) and t may be obtained through a lightning current monitoring device, and R may be obtained by referring to slope tower construction standards.

[0088] In some possible implementations, the stress change value of the potential sliding surface of the tower base slope under the condition of lightning impulse is obtained as an input parameter of the calculation formula to obtain the stability safety factor of the slope. The specific steps include:

[0089] The limit equilibrium method is used to analyze the stability of the tower base slope under lightning impulse conditions. The stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is used as the input parameter. Based on the limit equilibrium method, the stability safety factor of the slope is obtained.

[0090] In some possible implementations, a slope stability analysis model considering lightning impulse conditions is established, the influence of lightning impulse conditions on the potential sliding surface stress of the slope is used as the input parameter of the model, and the stability safety factor F of the slope is calculated. s :

[0091] Obtain the normal stress of the potential sliding surface of the slope when the slope tower is not struck by lightning, and calculate the corrected normal stress σ when the normal stress of the potential sliding surface of the slope changes n1 for:

[0092] σ n1 =σ n0 +Δσcosθ

[0093] When the slope tower is not struck by lightning, the shear stress t0 on the potential sliding surface of the slope is:

[0094] τ0=σ n0 tanθ

[0095] The corrected shear stress τ1 is:

[0096] τ1=τ0+Δσsinθ

[0097] The force N′ generated by the corrected normal stress is:

[0098] N′=σ n1 A

[0099] The force T' generated by the corrected shear stress is:

[0100] T′=τ1A

[0101] Calculate the anti-slip force and sliding force:

[0102]

[0103] Sliding force = T'

[0104] Safety factor F of the stability of the tower base slope under lightning impulse conditions s for:

[0105]

[0106] The specific calculation data are shown in Table 2:

[0107] Table 2

[0108]

[0109]

[0110] Among them, σ n0 represents the initial normal stress, that is, the normal stress on the potential sliding surface of the slope without external force, Δσ represents the stress change, which represents the change of normal stress caused by lightning strike, θ represents the sliding surface inclination, that is, the inclination angle of the potential sliding surface of the slope, A represents the area of ​​the potential sliding surface of the slope, represents the internal friction angle, which is used to affect the magnitude of the anti-slip force, and c0 represents the cohesion.

[0111] In some possible implementations, when the slope tower is not struck by lightning, the shear stress on the potential sliding surface of the slope only considers the component of the normal stress on the potential sliding surface of the rock mass in the tangent direction of the potential sliding surface.

[0112] In some possible implementations, the anti-slip force mainly consists of two parts: the anti-slip force generated by cohesion and the anti-slip force generated by friction; the sliding force is the sliding force generated by the shear stress on the potential sliding surface.

[0113] In some possible implementations, the stability of the tower base slope under lightning impulse conditions is evaluated according to the stability safety factor, and the specific steps include: s > When the threshold is set, the slope is in a stable state; when F s= When the threshold is set, the slope is in the limit equilibrium state; when F s When the threshold is less than the set value, the slope is in an unstable state.

[0114] In some possible implementations, the calculated slope stability safety factor F s Compare with 1. When F s >1, the slope is in a stable state; when F s =1, the slope is in a state of limit equilibrium; when F s When F is less than 1, the slope is in an unstable state. Compare the stability of the slope tower when it is not struck by lightning and when it is struck by lightning to evaluate the impact of lightning on the stability of the slope tower. s =1.41>1, the slope is in a stable state.

[0115] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A limit equilibrium assessment method for the stability of the tower foundation slope under lightning impulse conditions, characterized in that: The specific steps include: Obtain the potential sliding surface parameters of the target slope and the material parameters of the rock and soil mass, and build a lightning-struck slope tower model; Based on the lightning-struck slope tower model, the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is calculated; Based on the conversion coefficient, a calculation function for the stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is constructed; The potential sliding surface stress change value of the tower base slope under lightning impulse condition is obtained as the input parameter of the calculation function to obtain the stability safety factor of the slope; According to the stability safety factor s Assess the stability of the tower base slope under lightning impulse conditions.

2. The method for evaluating the limit equilibrium stability of the tower foundation slope under lightning impulse conditions according to claim 1 is characterized in that: The potential sliding surface parameters of the slope include: the potential sliding surface area of ​​the slope and the angle between the potential sliding surface and the horizontal direction; The rock and soil material parameters include: cohesion, original internal friction angle and original normal stress.

3. The method for evaluating the limit equilibrium of the tower foundation slope stability under lightning impulse conditions according to claim 1 is characterized in that: The calculation of the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current based on the lightning-struck slope tower model specifically includes: Based on the lightning-struck slope tower model, the instantaneous value of the lightning current at the time, the tower grounding resistance and the lightning strike duration are obtained, and the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistance is obtained; During a lightning strike, the stress change value of the potential sliding surface of the slope is obtained in real time. Combined with the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistor, the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current is obtained.

4. The method for evaluating the limit equilibrium of the tower foundation slope stability under lightning impulse conditions according to claim 3 is characterized in that: The heat calculation step of the lightning impulse current flowing through the grounding resistance in the tower base slope comprises: Where Q represents the heat generated in the tower base slope by the lightning impulse current flowing through the grounding resistance, i(t) represents the instantaneous value of the lightning current at time t, R represents the tower grounding resistance, and t represents the duration of the lightning strike.

5. The method for evaluating the limit equilibrium of the slope stability of the tower foundation under lightning impulse conditions according to claim 4 is characterized in that: The calculation steps of the conversion coefficient between the stress variation of the potential sliding surface of the slope and the heat generated by the lightning impulse current include: Among them, △σ represents the stress change value of the potential sliding surface of the slope, k represents the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current, i(t) represents the instantaneous value of the lightning current at time t, R represents the grounding resistance of the tower, and t represents the duration of the lightning strike.

6. The method for evaluating the limit equilibrium of the slope stability of the tower foundation under lightning impulse conditions according to claim 5 is characterized in that: The calculation formula for the stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is constructed based on the conversion coefficient, specifically including: Among them, △σ represents the stress change value of the potential sliding surface of the slope, k represents the conversion coefficient between the stress change of the potential sliding surface of the slope and the heat generated by the lightning impulse current, i(t) represents the instantaneous value of the lightning current at time t, R represents the grounding resistance of the tower, and t represents the duration of the lightning strike.

7. The method for evaluating the limit equilibrium stability of a tower foundation slope under lightning impulse conditions according to claim 1 is characterized in that: The step of obtaining the potential sliding surface stress change value of the tower base slope under lightning impulse conditions as an input parameter of the calculation formula to obtain the stability safety factor of the slope includes: The limit equilibrium method is used to analyze the stability of the tower base slope under lightning impulse conditions. The stress change value of the potential sliding surface of the tower base slope under lightning impulse conditions is used as the input parameter. Based on the limit equilibrium method, the stability safety factor of the slope is obtained.

8. The method for evaluating the limit equilibrium stability of the tower foundation slope under lightning impulse conditions according to claim 7 is characterized in that: Based on the limit equilibrium method, the stability safety factor of the slope is obtained. The specific steps include: Obtain the normal stress of the slope stress without any change, and obtain the corrected normal stress; Based on the corrected normal stress, the force generated by the corrected normal stress is obtained; Obtain the shear stress on the potential sliding surface of the slope when lightning impulse conditions are not considered, and obtain the corrected shear stress; Based on the corrected shear stress, the force generated by the corrected shear stress is obtained; Based on the force generated by the corrected normal stress and the force generated by the corrected shear stress, the anti-sliding force and the sliding force are obtained respectively; Based on the anti-sliding force and sliding force, the stability safety factor of the tower base slope under lightning impulse conditions is determined.

9. The method for evaluating the limit equilibrium of the slope stability of the tower foundation under lightning impulse conditions according to claim 8 is characterized in that: The specific calculation steps of the slope stability safety factor include: When the normal stress of the potential sliding surface of the slope changes, the corrected normal stress σ n1 for: s n1 =s n0 +Δσcosθ When the slope tower is not struck by lightning, the shear stress t0 on the potential sliding surface of the slope is: τ0=σ n0 tanθ The corrected shear stress τ1 is: τ1=τ0+Δσsinθ The force N′ generated by the corrected normal stress is: N′=σ n1 A The force T′ generated by the corrected shear stress is: T′=τ1A Calculate the anti-slip force and sliding force: Sliding force = T' Safety factor F of the stability of the tower base slope under lightning impulse conditions s for: Among them, σ n0 represents the initial normal stress, that is, the normal stress on the potential sliding surface of the slope without external force, Δσ represents the stress change, which represents the change of normal stress caused by lightning strike, θ represents the sliding surface inclination, that is, the inclination angle of the potential sliding surface of the slope, A represents the area of ​​the potential sliding surface of the slope, represents the internal friction angle, which is used to affect the magnitude of the anti-slip force, and c0 represents the cohesion.

10. The method for evaluating the limit equilibrium stability of a tower foundation slope under lightning impulse conditions according to claim 1, characterized in that: The specific steps of evaluating the stability of the tower base slope under lightning impulse conditions according to the stability safety factor include: The stability safety factor F of the tower base slope under lightning impulse conditions s >When the threshold is set, the slope is in a stable state; The stability safety factor F of the tower base slope under lightning impulse conditions s =When the threshold is set, the slope is in the limit equilibrium state; The stability safety factor F of the tower base slope under lightning impulse conditions s When the threshold is less than the set value, the slope is in an unstable state.

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