Method and system for analyzing safe distance between power transmission tower and earthquake type landslide

Abstract

The invention discloses a method and system for analyzing the safety distance between a power transmission tower and an earthquake type landslide, and the method comprises the steps: obtaining seismic data and geological data, and building a coupling model of the power transmission tower and the landslide under different seismic intensities; based on the coupling model of the power transmission tower and the landslide, establishing a damage model of the seismic landslide of the power transmission tower in combination with finite element analysis; calculating the safety distance from the power transmission tower to the earthquake type landslide based on the damage model of the power transmission tower earthquake type landslide; and based on an indoor simulation test, the calculated safety distance is verified. According to the method, the influence of earthquake factors is considered, the damage model of the power transmission tower earthquake type landslide is established, the safety distance between the power transmission tower and the earthquake type landslide is calculated, and the result is more accurate. According to the method, the defects of landslide deformation damage and formation mechanism research after an earthquake are overcome, a basic subject theory for geological disaster monitoring and early warning critical value research is formed, and a scientific basis is provided for geological disaster monitoring and early warning decision making.

Description

Technical Field

[0001] The invention relates to the technical field of safe distance between a transmission tower and a slope shoulder, and in particular to an analysis method and system for the safe distance between a transmission tower and an earthquake-type landslide. Background Art

[0002] In 2022, after experiencing the test of electricity consumption brought by extreme summer weather, the Sichuan-Chongqing 1000 kV UHV AC project was officially launched for social development and to meet the electricity demand in the southwest region. Due to the shortage of land for transmission line corridors, most of the lines pass through mountainous and hilly areas. Many transmission towers in the southwestern mountainous areas are located on the slope for economic and practical reasons. Once the slope where the transmission tower is located is unstable, it will inevitably affect the stability of the transmission tower and the safety of the transmission line. There are many factors that lead to the instability of the slope where the transmission tower is located, such as natural factors such as continuous rainfall and frequent earthquakes, as well as unreasonable human engineering activities that cause the lower part of the slope to lose support; human factors such as soil erosion caused by improper human activities such as deforestation, grass destruction, and land reclamation. However, the site selection of the transmission tower also plays a decisive role in the stability of the slope. If the transmission tower built on the slope maintains a certain safe distance from the landslide, it can avoid the impact of the landslide on the transmission tower line to a certain extent, and play a key role in maintaining the stability of the transmission tower. The safety distance value is a world-renowned discipline and technical problem that has long been recognized. Because each landslide has its own characteristics, it is difficult to find a common critical value. The deformation and destruction mechanism of landslides is complex and there are many triggering factors. According to the main triggering factors of landslides, establishing a safe distance value between the transmission tower and the slope shoulder is a technical difficulty that is relatively easy to overcome.

[0003] Research status at home and abroad: ① At present, there is no clear calculation method for the safe distance between transmission towers and slope shoulders in China. The requirements in the "Code for Design of Building Foundations" are limited to buildings with strip foundations and rectangular foundations, and are not requirements for tall structures such as transmission towers. ② The methods for determining the safe distance between transmission towers and slope shoulders based on landslide failure mechanism are mostly based on landslide models under natural conditions, and ignore the accelerated structural damage process caused by the change in the stress state of the slope during an earthquake. Therefore, it cannot truly reflect the impact of earthquakes on landslides in actual processes. There has been little research on the impact of slope structure changes after an earthquake on slope stability, and the methods and results are not very mature.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The purpose of the present invention is to provide a method and system for analyzing the safe distance between a transmission tower and an earthquake-type landslide. The present invention is aimed at most transmission towers, but is not limited to buildings with rectangular foundations and strip foundations. At the same time, the present invention only targets the tall structures of transmission towers, and the results are more accurate and more targeted. In addition, considering that the transmission tower corridor is located in a mountainous area and is prone to earthquakes, the present invention takes into account the influence of earthquake factors, establishes a destruction model of an earthquake-type landslide of a transmission tower, and calculates the safe distance between the transmission tower and the earthquake-type landslide.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide, the method comprising:

[0008] Obtain seismic data and geological data. Seismic data refers to the seismic data for a period of time before and after the landslide occurs; geological data refers to the survey data of topographical morphology, damage accumulation range, collapse and sliding process, and physical and mechanical parameters of rock and soil bodies during landslide deformation and destruction;

[0009] Based on earthquake data and geological data, a coupling model of transmission towers and landslides under different earthquake intensities is established; based on the coupling model of transmission towers and landslides, combined with finite element analysis, a failure model of transmission tower earthquake-induced landslides is established;

[0010] Based on the destruction model of earthquake-induced landslide of transmission tower, the safe distance between transmission tower and earthquake-induced landslide is calculated; and the calculated safe distance is verified based on indoor simulation test.

[0011] Furthermore, based on seismic data and geological data, a coupling model of transmission towers and landslides under different earthquake intensities is established; based on the coupling model of transmission towers and landslides, combined with finite element analysis, a failure model of transmission tower earthquake-induced landslides is established, including:

[0012] Based on geological data, the topographic map is constructed into a two-dimensional landslide model;

[0013] The two-dimensional landslide model and the transmission tower model are connected to each other to form a coupled model of transmission tower and landslide under different earthquake intensities;

[0014] The coupled model of transmission tower and landslide was imported into finite element software abaqus to process materials, loads and analysis steps;

[0015] Based on the finite element software abaqus, numerical simulation methods are used to analyze seismic waves of different frequencies and magnitudes;

[0016] Adjust the distance between the transmission tower and the landslide shoulder to form multiple groups of transmission tower landslide models with different distances;

[0017] After calculating all the model groups in the finite element software abaqus, the stress cloud map and strain cloud map of the landslide deformation and the gradual destruction process of the transmission tower in a certain period of time were obtained, that is, the destruction model of the transmission tower earthquake-induced landslide.

[0018] Further material, load and analysis step processing is performed, including:

[0019] For the setting of transmission tower material parameters, Q420 steel was selected;

[0020] Seismic loads were applied by introducing seismic waves with acceleration amplitudes of 0.05g to 0.10g into the finite element analysis software;

[0021] For the analysis step setting, the dynamic implicit analysis method is used for landslide seismic analysis.

[0022] Furthermore, the numerical simulation method comprises:

[0023] Viscoelastic artificial boundaries are used to simulate seismic waves. The viscoelastic artificial boundaries are to establish a pair of dampers and springs in the normal and tangential directions of the boundary plane, respectively. The expression is:

[0024]

[0025] Where: K n and K s denote the normal and tangential spring stiffness at the boundary nodes respectively; A is half of the total length of all boundaries; R is the distance from the scattering source to the artificial boundary node; λ, G and ρ are the Lamley constant, shear modulus and mass density of the ground respectively; ar and br are correction coefficients with values ​​of 0.8 and 1.1 respectively.

[0026] Furthermore, based on the failure model of the earthquake-induced landslide of the transmission tower, the safe distance between the transmission tower and the earthquake-induced landslide is calculated, including:

[0027] Based on the failure model of earthquake-induced landslide of transmission tower, the coordinate changes of the tower feet at both ends of the transmission tower after the earthquake are queried;

[0028] According to the change of coordinate points, the inclination of the transmission tower is calculated, and the inclination of multiple groups of transmission towers with different distances from the slope shoulder are obtained;

[0029] According to the inverse relationship between the inclination of the transmission tower and the distance between the transmission tower and the shoulder of the landslide, a curve of the relationship between the distance between the transmission tower and the shoulder of the landslide and the inclination of the transmission tower is fitted;

[0030] According to the turning point in the relationship curve, the safe distance between the transmission tower and the earthquake-type landslide is obtained.

[0031] Furthermore, the calculated safety distance is verified based on indoor simulation tests, including:

[0032] A reduced-size transmission tower and landslide coupling model was built and placed in a steel frame plexiglass tank with dimensions of 4500mm×1500mm×800mm;

[0033] The steel frame plexiglass trough was placed on a vibration table, and the corresponding seismic wave parameters were input to conduct seismic tests on transmission towers and landslides;

[0034] By attaching strain sensors at key locations, we can obtain the strain change data of transmission towers and landslide earthquakes;

[0035] The distance between the transmission tower and the shoulder of the landslide is adjusted to obtain multiple sets of data on the distance between the transmission tower and the shoulder of the landslide and the inclination of the transmission tower corresponding to the numerical simulation, and a linear fitting is performed on them;

[0036] The fitting results are compared with the results of numerical simulation to further verify the correctness of the numerical simulation results.

[0037] In a second aspect, the present invention further provides a system for analyzing the safe distance between a transmission tower and an earthquake-induced landslide, the system comprising:

[0038] The acquisition unit is used to acquire seismic data and geological data. The seismic data refers to the seismic data within a period of time before and after the landslide occurs; the geological data refers to the survey data of the topographical morphology, the damage accumulation range, the collapse and sliding process, and the physical and mechanical parameters of the rock and soil body during the deformation and destruction of the landslide.

[0039] The damage model building unit is used to build a coupling model of transmission towers and landslides under different earthquake intensities based on earthquake data and geological data; based on the coupling model of transmission towers and landslides, combined with finite element analysis, a damage model of transmission tower earthquake-induced landslides is built;

[0040] A calculation unit, used for calculating a safe distance between the transmission tower and the earthquake-type landslide based on a failure model of the earthquake-type landslide of the transmission tower;

[0041] The verification unit is used to verify the calculated safety distance based on indoor simulation tests.

[0042] Furthermore, the damage model building unit includes:

[0043] The landslide model construction subunit is used to construct the topographic map into a two-dimensional landslide model based on geological data;

[0044] A coupling model building subunit is used to connect the two-dimensional landslide model and the transmission tower model to each other to form a coupling model of the transmission tower and the landslide under different earthquake intensities;

[0045] Finite element subunits are used to import the coupled model of transmission tower and landslide into the finite element software abaqus for material, load and analysis step processing;

[0046] The numerical simulation subunit is used to analyze seismic waves of different frequencies and magnitudes using numerical simulation methods based on the finite element software abaqus;

[0047] The model group forms a sub-unit, which is used to adjust the distance between the transmission tower and the landslide shoulder, forming multiple groups of transmission tower landslide model groups with different distances;

[0048] The destruction model forms sub-units, which are used to calculate all model groups in the finite element software abaqus to obtain the stress cloud map and strain cloud map of landslide deformation, as well as the gradual destruction process of the transmission tower within a certain period of time, that is, the destruction model of the earthquake-induced landslide of the transmission tower.

[0049] In a third aspect, the present invention 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 implements the above-mentioned method for analyzing the safe distance between a transmission tower and an earthquake-type landslide when executing the computer program.

[0050] In a fourth aspect, the present invention further provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned method for analyzing the safe distance between a transmission tower and an earthquake-type landslide.

[0051] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0052] 1. The present invention provides a method and system for analyzing the safe distance between a transmission tower and an earthquake-type landslide. The method is applicable to most transmission towers, but not limited to buildings with rectangular foundations and strip foundations. The present invention only targets the tall structures of transmission towers, and the results are more accurate and targeted. In addition, considering that the transmission tower corridor is located in a mountainous area and prone to earthquakes, the present invention takes into account the influence of earthquake factors, establishes a failure model of an earthquake-type landslide of a transmission tower, and calculates the safe distance between the transmission tower and the earthquake-type landslide.

[0053] 2. The present invention provides a method and system for analyzing the safe distance between a transmission tower and an earthquake-type landslide. The present invention proposes a method for determining the safe distance between transmission towers, which is free from the basic type restrictions of traditional methods. At the same time, the deformation and damage mode of typical landslides under earthquakes is explored, and the relationship between the safe distance between transmission towers and earthquake-type landslides and earthquake intensity, focal depth, transverse and longitudinal wave influence range, surface displacement and deep displacement when landslide and debris flow source bodies are destroyed is revealed, and the safe distance between transmission towers and earthquake-type slope shoulders is determined. This method makes up for the deficiencies in the research on deformation and damage of landslides after earthquakes and their formation mechanisms, forms a basic discipline theory for the research on critical values ​​of geological disaster monitoring and early warning, and provides a scientific basis for geological disaster monitoring and early warning decision-making. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0055] Figure 1 A flow chart of a method for analyzing the safe distance between a transmission tower and an earthquake-type landslide according to the present invention;

[0056] Figure 2 A detailed flow chart of a method for analyzing the safe distance between a transmission tower and an earthquake-type landslide according to the present invention;

[0057] Figure 3 It is the model source used in the numerical simulation in the embodiment of the present invention;

[0058] Figure 4 is a mathematical model established in the numerical simulation in the embodiment of the present invention;

[0059] Figure 5 is a time history diagram of seismic wave acceleration used in numerical simulation in an embodiment of the present invention;

[0060] Figure 6 It is a stress-strain result diagram of the transmission tower at different distances from the landslide shoulder in the numerical simulation in the embodiment of the present invention;

[0061] Figure 7 A diagram showing changes in coordinate points of the tower feet at both ends of a transmission tower after an earthquake in a numerical simulation in an embodiment of the present invention;

[0062] Figure 8 is a fitting curve diagram of the distance between the transmission tower and the shoulder of the landslide and the inclination of the transmission tower in the numerical simulation in the embodiment of the present invention;

[0063] Fig. 9 This is a schematic diagram of the structure of a model test tank according to an embodiment of the present invention;

[0064] Fig.10 The present invention is a structural block diagram of an analysis system for the safe distance between a transmission tower and an earthquake-induced landslide. DETAILED DESCRIPTION

[0065] 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.

[0066] At present, there is no clear method for determining the safe distance between transmission towers and slope shoulders in China, but the following methods are related to it:

[0067] 5.4.2 of the Code for Design of Building Foundations GB 50007-2011 proposes relevant specifications for buildings located on the top of a stable soil slope. For strip foundations and rectangular foundations, when the length of the foundation bottom surface perpendicular to the slope top edge line is less than or equal to 3m, the horizontal distance from the outer edge line of the foundation bottom surface to the slope top should meet the requirements of the following formula and be no less than 2.5m.

[0068] Strip foundation

[0069] Rectangular foundation

[0070] Where: a is the horizontal distance from the outer edge line of the foundation bottom surface to the top of the slope (m); b is the length of the foundation bottom surface perpendicular to the outer edge line of the slope top (m); d is the foundation burial depth (m); β is the slope angle (°).

[0071] However, it is a requirement for all buildings, not just for the towering structure of transmission towers, and there is only a method for determining the safe distance value for buildings with rectangular and strip foundations. Therefore, for transmission tower structures, such design requirements may not be precise, which greatly affects the reliability and accuracy of these design requirements to a certain extent. This may cause unnecessary economic losses when selecting the site for the transmission tower corridor.

[0072] At present, scholars at home and abroad have used a variety of methods to analyze landslides. Finite element software is often used to simulate the mechanical changes of landslides, and indoor and outdoor landslide tests are used to verify the results of numerical simulations. Jia Yuyue (2024) used the strength reduction method in the finite element analysis software Abaqus to analyze the stability of coastal rock and soil slopes, and considered the combined effects of rainfall and earthquakes and the unique geological conditions and characteristics of coastal areas. The results showed that increasing the seismic acceleration while maintaining a constant water content will lead to an increase in soil shear stress and a decrease in shear strength, thereby reducing the stability coefficient. Heavy rainfall and strong earthquakes occur simultaneously, pushing the slope to the most unstable state, resulting in the most significant decrease in the stability coefficient. The use of anti-slip piles can significantly improve the slope stability coefficient, and an optimal arrangement scheme for anti-slip piles under the most unfavorable conditions is proposed; Amin Askarinejad (2018) conducted a comprehensive landslide triggering experiment on a natural sandy slope subjected to an artificial earthquake event, and used a new slope deformation sensor (SDS) to monitor underground pre-destruction movement and precursors of artificially triggered landslides. The measurement results show that the horizontal earth pressure in the compression zone of the unstable area increases rapidly, and the external bending work applied to the slope deformation sensor. These data are compared with the changes in pore water pressure and volumetric water content that lead to failure. The measurement results show that the horizontal earth pressure in the compression zone of the unstable area increases rapidly, and the external bending work applied to the slope deformation sensor. These data are compared with the changes in pore water pressure and volumetric water content that lead to failure; Zhou Yongqiang (2022) et al. took the Yanzi Tower base landslide as the research object, and through physical model experiments and numerical theoretical analysis, studied the destruction process of the tower base in the landslide and the corresponding destruction mode under rainfall. The planning design and experimental process of the physical model experiment of the tower base landslide under rainfall were introduced, revealing the tower base destruction process at different positions of the landslide under rainfall.

[0073] The above existing technologies have the following defects: ① At present, there is no clear calculation method for the safe distance between the transmission tower and the slope shoulder in China. The requirements in the "Code for Design of Building Foundations" are limited to buildings with strip foundations and rectangular foundations, and are not requirements for tall structures such as transmission towers. ② The methods for determining the safe distance between the transmission tower and the slope shoulder based on the landslide failure mechanism are mostly based on the landslide model under natural conditions, and ignore the accelerated structural destruction process caused by the change in the stress state of the slope during an earthquake. Therefore, it cannot truly reflect the impact of earthquakes on landslides in actual processes. There has been little research on the impact of slope structural changes after an earthquake on slope stability, and the methods and results are not very mature.

[0074] Therefore, the present invention designs an analysis method for the safe distance between a transmission tower and an earthquake-type landslide, takes numerical simulation and model test as the research direction, and the correlation between the instability, damage and deformation of the transmission tower slope triggered by natural disasters. A landslide failure model is established for the typical transmission tower-slope type in the southwestern mountainous area, and abaqus finite element software is used for numerical simulation to analyze the mechanical change mechanism of the evolution of the landslide zone of the transmission tower line system under the action of an earthquake. In addition, the indoor model test is used to supplement the insufficiency of field monitoring, further verify the correctness of the reference value of the safe distance between the transmission tower and the earthquake-type landslide, make a further improvement based on the test results, and finally provide the safe distance between the transmission tower and the earthquake-type landslide.

[0075] Example 1

[0076] like Figure 1 and Figure 2 As shown, the present invention provides a method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide, the method comprising:

[0077] Step 1, obtaining seismic data and geological data. The seismic data refers to the seismic data within a period of time before and after the landslide occurs; the geological data refers to the survey data of the topographic morphology, damage accumulation range, collapse and sliding process, and physical and mechanical parameters of the rock and soil body during the deformation and destruction of the landslide;

[0078] In this example, the risk point is the 500kV Kangshu 1 and 2 line 53# tower landslide. Using UAV remote sensing technology, we obtain historical earthquake data before and after the landslide, topographic and geomorphological data during landslide deformation and destruction, damage accumulation range, collapse and slide process, physical and mechanical parameters of rock and soil, and other geological data (i.e., field monitoring data), which is the basis for establishing the failure model of transmission tower earthquake-induced landslide.

[0079] According to the investigation, the landslide is located in Gancao Village, Tianba Township, Luding County, at the front edge of a slope on the right bank of Mujiaogou. There is a landslide (Gancao Village landslide) about 26m away from the downslope side of the AB leg of the 53# tower. The optical image shows that the whole is in the shape of a long tongue, with an orientation of 90° and a front slope of about 31°. The landslide is about 245m long, 130m wide, and covers an area of ​​23,600m2. The height difference between the front and rear edges is 175m. It is a small-scale landslide. Figure 3 shown.

[0080] Historical earthquake data include acceleration of seismic waves, earthquake intensity, focal depth, impact range of transverse and longitudinal waves, surface displacement and deep displacement, etc.

[0081] Step 2: Based on earthquake data and geological data, a coupling model of transmission towers and landslides under different earthquake intensities is established; based on the coupling model of transmission towers and landslides, combined with finite element analysis, a failure model of transmission tower earthquake-induced landslides is established;

[0082] Step 2 specifically includes:

[0083] Step 21, based on the geological data, the topographic map is constructed into a two-dimensional landslide model, such as Figure 4 As shown;

[0084] Step 22, connecting the two-dimensional landslide model and the transmission tower model to each other to form a coupled model of the transmission tower and the landslide under different earthquake intensities;

[0085] Step 23, import the coupled model of the transmission tower and the landslide into the finite element software abaqus to process the materials, loads and analysis steps;

[0086] In this embodiment, material, load and analysis step processing is performed, including:

[0087] (1) For the setting of transmission tower material parameters, Q420 steel is selected. The parameters of this material are shown in Table 1.

[0088] Table 1

[0089]

[0090] (2) Seismic loads are applied by introducing seismic waves with acceleration amplitudes of 0.05g to 0.10g into the finite element analysis software; the seismic acceleration time curve of the basic input of the model is as follows: Figure 5 shown.

[0091] (3) For the analysis step setting, the dynamic implicit analysis method is used for landslide earthquake modeling. Among them, the advantage of using the dynamic implicit analysis method for landslide earthquake modeling is that the implicit time integration scheme used in ABAQUS ensures accurate and stable results within a certain time step range, so that earthquakes of different frequencies and magnitudes can be accurately simulated.

[0092] Step 24, based on the finite element software abaqus, using a numerical simulation method to analyze seismic waves of different frequencies and magnitudes;

[0093] When using numerical simulation methods to analyze the seismic response of a two-dimensional layered slope site, it is necessary to separate the finite computational domain from the infinite ground. Artificial boundaries are usually used to simulate the scattered waves of the target structure and the non-reflected wave effects of truncated infinite domains. In the numerical simulation, the present invention uses a stable and accurate viscoelastic artificial boundary to simulate seismic waves, and establishes a pair of dampers and springs in the normal and tangential directions of the boundary plane, respectively. The expression is:

[0094]

[0095] Where: K n and K sdenote the normal and tangential spring stiffness at the boundary nodes respectively; A is half of the total length of all boundaries; R is the distance from the scattering source to the artificial boundary node; λ, G and ρ are the Lamley constant, shear modulus and mass density of the ground respectively; ar and br are correction coefficients with values ​​of 0.8 and 1.1 respectively.

[0096] Step 25, adjusting the distance between the transmission tower and the landslide shoulder, with 0.5 m as the interval unit, to form 8 groups of transmission tower landslide model groups with different distances;

[0097] Step 26, after all the model groups are operated in the finite element software abaqus, the stress cloud map and strain cloud map of the landslide deformation and the gradual destruction process of the transmission tower within a certain period of time are obtained, that is, the destruction model of the transmission tower earthquake-induced landslide.

[0098] In one of the models in this case, after the seismic wave was applied for 0.1938 steps, the maximum stress at the front leg of the transmission tower was 3.227e+5Pa, and the landslide began to have a displacement of 2.245e-4m. At this time, due to the influence of the earthquake vibration, the landslide deformed, the foundation of the transmission tower began to slide in the direction of the landslide, and the transmission tower also began to tilt. Finally, after the entire seismic wave was applied, the landslide had a total displacement of 5.171e-3m. The following is a graph of the stress-strain results at different distances between the transmission tower and the shoulder of the landslide, as shown below: Figure 6 shown.

[0099] Step 3, based on the failure model of the earthquake-induced landslide of the transmission tower, calculate the safe distance between the transmission tower and the earthquake-induced landslide;

[0100] Step 3 specifically includes:

[0101] Step 31, based on the failure model of the earthquake-induced landslide of the transmission tower, query the change of the coordinate points of the tower feet at both ends of the transmission tower after the earthquake;

[0102] In this embodiment, the change of the coordinate points of the tower feet at both ends of the transmission tower after the earthquake is queried from the failure model of the transmission tower earthquake landslide, such as Figure 7 As shown;

[0103] Step 32, calculating the inclination of the transmission tower according to the change of the coordinate point, and obtaining multiple groups of transmission tower inclinations at different distances from the transmission tower to the slope shoulder;

[0104] In this embodiment, the inclination of the transmission tower can be calculated according to the change of the coordinate points. The left foot of the transmission tower is point A, and the right foot of the transmission tower is point B. When the transmission tower is 2.5m away from the slope shoulder, after the action of the seismic wave, the height difference between points A and B is 0.0007m, and the distance between points A and B is 5m, which can be substituted into the inclination calculation formula:

[0105]

[0106] Where i is the inclination of the transmission tower; ΔH is the height difference between the two base points; L is the horizontal distance between the two base points;

[0107] The inclination of 8 groups of transmission towers with different distances from the slope shoulder can be obtained, as shown in Table 2. The safety of the tower can be judged according to the standard of tower inclination, as shown in Table 3.

[0108] Table 2

[0109] Distance(m) 2.5 3 3.5 4 4.5 5 5.5 6 tilt(‰) 1.43 0.82 0.52 0.47 0.43 0.41 0.39 0.40

[0110] Table 3

[0111]

[0112] Step 33, fitting a relationship curve between the distance from the transmission tower to the shoulder of the landslide and the inclination of the transmission tower according to the inverse relationship between the inclination of the transmission tower and the distance from the transmission tower to the shoulder of the landslide;

[0113] Step 34, according to the turning point in the relationship curve, the safe distance between the transmission tower and the earthquake-type landslide is obtained.

[0114] From Table 1, we can see that the inclination of the transmission tower is inversely proportional to the distance between the transmission tower and the shoulder of the landslide. The farther the transmission tower is from the landslide, the smaller the inclination of the transmission tower is, and the safer and more stable the transmission tower is. In order to further study the safe distance between the transmission tower and the shoulder of the landslide, we can perform a linear regression analysis on Table 1, as shown in Figure 1. Figure 8 As shown in the figure, according to the turning point where the slope of the curve changes from steep to gentle, it can be roughly determined that the safe distance between the transmission tower and the landslide in this model is 4m.

[0115] Step 4: Verify the calculated safety distance based on indoor simulation tests.

[0116] As field monitoring data may not necessarily include the process of landslide deformation under different earthquake intensities, the indoor model test method is used to supplement the data that cannot be monitored. The entire test process is recorded by a high-definition camera, and the displacement of any point in the observation surface at any time in the model test is measured by combining the PIV (Particle Image Velocimetry) particle image testing technology. The complete process of earthquake landslide deformation until destruction can be obtained under the reference value of the safety distance between the transmission tower and the typical earthquake-type landslide, so as to deeply study the relationship between the landslide surface deformation, the local strain of the transmission tower and the tower slope destruction process under different safety distances; and then the displacement field changes during landslide destruction are monitored by surface inclinometers set at different heights on the slope surface, and the relationship between different safety distances and displacement is established.

[0117] Step 4 specifically includes:

[0118] A reduced-size transmission tower and landslide coupling model was built and placed in a steel frame plexiglass tank with dimensions of 4500mm×1500mm×800mm;

[0119] The steel frame plexiglass trough was placed on a vibration table, and the corresponding seismic wave parameters were input to conduct seismic tests on transmission towers and landslides;

[0120] By attaching strain sensors at key locations, we can obtain the strain change data of transmission towers and landslide earthquakes;

[0121] The distance between the transmission tower and the shoulder of the landslide was adjusted to obtain 8 sets of data on the distance between the transmission tower and the shoulder of the landslide and the inclination of the transmission tower corresponding to the numerical simulation, and a linear fitting was performed on them.

[0122] The fitting results are compared with the results of numerical simulation to further verify the correctness of the numerical simulation results.

[0123] In this embodiment, the verification equipment and process description in step 4 are as follows:

[0124] (1) Model test tank

[0125] The model experiment uses a steel frame organic glass tank with a size of 4500mm×1500mm×800mm (length×width×height) and is mainly composed of a glass baffle and a metal bracket. The maximum material that can be loaded is 7m3, which meets the geometric similarity ratio of 1:200 proposed by the present invention. Fig. 9 shown.

[0126] (2) Earthquake simulation equipment

[0127] The earthquake simulation vibration table is a physical performance testing instrument used in the basic disciplines of mechanics, earth science, engineering and technology science. The table size is 3m×3m; frequency range: 0.4~50Hz; maximum model weight: 60t; maximum displacement: X direction: ±127mm; maximum speed: X direction: 600mm / s; maximum acceleration: X direction: 1.0g; maximum overturning moment: 30t*m.

[0128] (3) Data acquisition and video monitoring system

[0129] The original instruments and equipment include multi-channel data acquisition devices, resistive strain gauge measurements, vibrating string sensor measurements, surface inclinometers, GPRS communication equipment, high-definition digital cameras, etc., which connect the test monitoring data to the monitoring and early warning platform of the landslide room of the Mountain Institute.

[0130] Parameter measurement and analysis of this specific implementation method:

[0131] ① Physical and mechanical parameters of the model

[0132] The geotechnical triaxial test method is used to measure the natural water content, density, specific gravity (natural, saturated), void ratio, plastic limit, liquid limit, cohesion, internal friction angle, elastic modulus, Poisson's ratio, etc. of typical landslide bodies and sliding belt soils.

[0133] ②Displacement (three methods)

[0134] Method 1: Use a surface inclinometer to measure the change in the displacement of the slope surface during the destruction of the measuring point;

[0135] Method 2: Use the grid division method to measure the change in deep displacement during the slope change process;

[0136] Method 3: Combine PIV technology to measure the displacement of any point in the observation surface at any time.

[0137] ③ Earthquake related parameters

[0138] The earthquake simulation vibration table can set relevant parameters such as frequency, vibration amplitude, vibration direction, etc. according to the needs of the test.

[0139] ④Data analysis and collation

[0140] The experimental data were sorted out, and a statistical analysis was conducted on the distance between the transmission tower and the slope shoulder when the landslide was damaged under strong earthquake conditions. Combined with the in-situ monitoring data of typical earthquake landslides in the field, the relationship between the landslide displacement, transmission tower inclination and earthquake intensity during typical rainfall landslide damage was revealed, and a preliminary safe distance between the transmission tower and the earthquake-type landslide was established.

[0141] The test method of this specific implementation method: the model test uses a typical landslide as a prototype, and conducts a similar model test of the landslide deformation and destruction process under earthquake conditions, revealing the dynamic change law between the displacement of a typical earthquake-type landslide, the inclination of a transmission tower and the earthquake intensity, supplementing the blank part of the field monitoring data, and serving as a reliable source of data in numerical simulation, providing a corresponding scientific basis for further perfecting and improving the actual value of the safe distance between the transmission tower and the earthquake-type landslide.

[0142] It is planned to explore the physical process and mechanical mechanism of earthquake-induced landslide damage of transmission towers through inversion experiments on typical landslide deformation and failure processes, obtain the relationship between different earthquake intensities and their spatial distribution of slope deformation and time, and invert the safe distance value of transmission towers from earthquake-type landslides under different influencing factors through the landslide displacement and transmission tower inclination in the experiment.

[0143] At present, there is no clear calculation method for the safe distance between the transmission tower and the slope shoulder in China. The present invention proposes a method for determining the safe distance of the transmission tower, which is free from the basic type restrictions of the traditional method. At the same time, the deformation and damage mode of typical landslides under earthquakes is explored, and the relationship between the safe distance between the transmission tower and the earthquake-type landslide and the earthquake intensity, focal depth, transverse and longitudinal wave influence range, surface displacement and deep displacement when the source body of the landslide and debris flow is destroyed is revealed, and the safe distance between the transmission tower and the earthquake-type slope shoulder is determined. Make up for the deficiencies in the research on the deformation and damage of landslides after earthquakes and their formation mechanism, form a basic discipline theory for the research on the critical value of geological disaster monitoring and early warning, and provide a scientific basis for geological disaster monitoring and early warning decision-making.

[0144] Example 2

[0145] like Fig.10 As shown, the difference between this embodiment and embodiment 1 is that this embodiment provides an analysis system for the safe distance between a transmission tower and an earthquake-type landslide, and the system corresponds to the analysis method for the safe distance between a transmission tower and an earthquake-type landslide in embodiment 1 in a one-to-one manner, and the system includes:

[0146] The acquisition unit is used to acquire seismic data and geological data. The seismic data refers to the seismic data within a period of time before and after the landslide occurs; the geological data refers to the survey data of the topographical morphology, the damage accumulation range, the collapse and sliding process, and the physical and mechanical parameters of the rock and soil body during the deformation and destruction of the landslide.

[0147] The damage model building unit is used to establish the coupling model of transmission towers and landslides under different earthquake intensities based on earthquake data and geological data; based on the coupling model of transmission towers and landslides, combined with finite element analysis, the damage model of transmission tower earthquake-type landslides is established;

[0148] A calculation unit, used for calculating a safe distance between the transmission tower and the earthquake-type landslide based on a failure model of the earthquake-type landslide of the transmission tower;

[0149] The verification unit is used to verify the calculated safety distance based on indoor simulation tests.

[0150] As a further implementation, the damage model building unit includes:

[0151] The landslide model construction subunit is used to construct the topographic map into a two-dimensional landslide model based on geological data;

[0152] A coupling model building subunit is used to connect the two-dimensional landslide model and the transmission tower model to each other to form a coupling model of the transmission tower and the landslide under different earthquake intensities;

[0153] Finite element subunits are used to import the coupled model of transmission tower and landslide into the finite element software abaqus for material, load and analysis step processing;

[0154] The numerical simulation subunit is used to analyze seismic waves of different frequencies and magnitudes using numerical simulation methods based on the finite element software abaqus;

[0155] The model group forms a sub-unit, which is used to adjust the distance between the transmission tower and the landslide shoulder, forming multiple groups of transmission tower landslide model groups with different distances;

[0156] The destruction model forms sub-units, which are used to calculate all model groups in the finite element software abaqus to obtain the stress cloud map and strain cloud map of landslide deformation, as well as the gradual destruction process of the transmission tower within a certain period of time, that is, the destruction model of the earthquake-induced landslide of the transmission tower.

[0157] The execution process of each unit can be performed according to the process steps of the analysis method for the safe distance between a transmission tower and an earthquake-type landslide in Example 1, and will not be repeated in this embodiment.

[0158] At the same time, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned method for analyzing the safe distance between a transmission tower and an earthquake-type landslide is implemented.

[0159] At the same time, the present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the above-mentioned method for analyzing the safe distance between a transmission tower and an earthquake-type landslide.

[0160] The present invention uses model tests, numerical simulations and the research direction of the safe distance between transmission towers and earthquake-type landslides, and for typical landslide types in earthquake-stricken areas, establishes a mathematical model of transmission tower lines and earthquake-type landslides, analyzes the dynamic response and failure mode of the transmission tower line system under earthquake action, analyzes the dynamic coupling mechanism of seismic waves and the evolution of the landslide area of ​​the transmission tower line system, obtains the safe distance value of the transmission tower from the slope shoulder during the deformation and failure process of earthquake landslides, provides another method for determining the safety of transmission towers in mountainous areas, and provides technical references and scientific basis for the site selection and geological disaster prevention of transmission tower line corridors in southwest my country. The present invention makes up for the deficiencies in the research on deformation and failure of landslides after earthquakes and their formation mechanism, and provides a scientific basis for monitoring and early warning of geological disasters in mountainous areas in southwest China.

[0161] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0162] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0163] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0164] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0165] 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 method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide, characterized in that: The method includes: Acquire seismic data and geological data, wherein the seismic data is seismic data within a period of time before and after the landslide occurs; the geological data is survey data of topographical morphology, damage accumulation range, collapse and sliding process, and physical and mechanical parameters of rock and soil bodies during landslide deformation and destruction; Based on the earthquake data and geological data, a coupling model of transmission towers and landslides under different earthquake intensities is established; based on the coupling model of transmission towers and landslides, combined with finite element analysis, a failure model of transmission tower earthquake-type landslides is established; Based on the destruction model of the earthquake-induced landslide of the transmission tower, the safe distance between the transmission tower and the earthquake-induced landslide is calculated; and based on indoor simulation tests, the calculated safe distance is verified.

2. The method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide according to claim 1, characterized in that: Based on the earthquake data and geological data, a coupling model of transmission towers and landslides under different earthquake intensities is established; Based on the coupling model of transmission tower and landslide, combined with finite element analysis, a failure model of transmission tower earthquake-induced landslide is established, including: Based on the geological data, constructing the topographic map into a two-dimensional landslide model; The two-dimensional landslide model and the transmission tower model are connected to each other to form a coupled model of the transmission tower and the landslide under different earthquake intensities; Importing the transmission tower and landslide coupling model into finite element software to process materials, loads and analysis steps; Based on finite element software, numerical simulation methods are used to analyze seismic waves of different frequencies and magnitudes; Adjust the distance between the transmission tower and the landslide shoulder to form multiple groups of transmission tower landslide models with different distances; After calculating all model groups in finite element software, the stress cloud map and strain cloud map of landslide deformation and the gradual destruction process of the transmission tower in a certain period of time were obtained, that is, the destruction model of the transmission tower earthquake-induced landslide.

3. The method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide according to claim 2, characterized in that: Perform material, load, and analysis step processing, including: For the setting of transmission tower material parameters, Q420 steel was selected; Seismic loads were applied by introducing seismic waves with acceleration amplitudes of 0.05g to 0.10g into the finite element analysis software; For the analysis step setting, the dynamic implicit analysis method is used for landslide seismic modeling.

4. The method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide according to claim 2, characterized in that: The numerical simulation method comprises: A viscoelastic artificial boundary is used to simulate seismic waves. The viscoelastic artificial boundary is to establish a pair of dampers and springs in the normal and tangential directions of the boundary plane, respectively. The expression is: Where: K n and K s denote the normal and tangential spring stiffness at the boundary nodes respectively; A is half of the total length of all boundaries; R is the distance from the scattering source to the artificial boundary node; λ, G and ρ are the Lamley constant, shear modulus and mass density of the ground respectively; ar and br are correction coefficients.

5. The method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide according to claim 1, characterized in that: Based on the failure model of the transmission tower earthquake-induced landslide, the safe distance between the transmission tower and the earthquake-induced landslide is calculated, including: Based on the failure model of the transmission tower earthquake-induced landslide, query the change of the coordinate points of the tower feet at both ends of the transmission tower after the earthquake; According to the change of coordinate points, the inclination of the transmission tower is calculated, and the inclination of multiple groups of transmission towers with different distances from the slope shoulder are obtained; According to the inverse relationship between the inclination of the transmission tower and the distance between the transmission tower and the shoulder of the landslide, a curve of the relationship between the distance between the transmission tower and the shoulder of the landslide and the inclination of the transmission tower is fitted; According to the turning point in the relationship curve, the safe distance between the transmission tower and the earthquake-type landslide is obtained.

6. The method for analyzing the safe distance between a transmission tower and an earthquake-induced landslide according to claim 1, characterized in that: The calculated safety distance is verified based on indoor simulation tests, including: Build a scaled-down transmission tower and landslide coupling model and place it in a steel frame plexiglass tank; The steel frame organic glass tank is placed on a vibration table, and the corresponding seismic wave parameters are input to conduct seismic tests on the transmission tower and the landslide; By attaching strain sensors at key locations, we can obtain the strain change data of transmission towers and landslide earthquakes; The distance between the transmission tower and the shoulder of the landslide is adjusted to obtain multiple sets of data on the distance between the transmission tower and the shoulder of the landslide and the inclination of the transmission tower corresponding to the numerical simulation, and a linear fitting is performed on them; The fitting results are compared with the results of numerical simulation to further verify the correctness of the numerical simulation results.

7. An analysis system for the safe distance between a transmission tower and an earthquake-induced landslide, characterized in that: The system includes: An acquisition unit is used to acquire seismic data and geological data, wherein the seismic data is seismic data within a period of time before and after the landslide occurs; and the geological data is survey data of topographical morphology, damage accumulation range, collapse and sliding process, and physical and mechanical parameters of rock and soil bodies during landslide deformation and destruction; A damage model building unit is used to build a coupling model of a transmission tower and a landslide under different earthquake intensities based on the earthquake data and geological data; based on the coupling model of the transmission tower and the landslide, combined with finite element analysis, a damage model of an earthquake-type landslide of a transmission tower is built; A calculation unit, used for calculating the safe distance between the transmission tower and the earthquake-type landslide based on the failure model of the earthquake-type landslide of the transmission tower; The verification unit is used to verify the calculated safety distance based on indoor simulation tests.

8. The analysis system for the safe distance between a transmission tower and an earthquake-induced landslide according to claim 7, characterized in that: The damage model building unit comprises: A landslide model construction subunit is used to construct a topographic map into a two-dimensional landslide model based on the geological data; A coupling model building subunit is used to connect the two-dimensional landslide model and the transmission tower model to each other to form a coupling model of the transmission tower and the landslide under different earthquake intensities; A finite element subunit is used to import the coupling model of the transmission tower and the landslide into the finite element software to perform material, load and analysis step processing; Numerical simulation subunit, used to analyze seismic waves of different frequencies and magnitudes using numerical simulation methods based on finite element software; The model group forms a sub-unit, which is used to adjust the distance between the transmission tower and the landslide shoulder, forming multiple groups of transmission tower landslide model groups with different distances; The destruction model forms a sub-unit, which is used to calculate all model groups in the finite element software to obtain the stress cloud map and strain cloud map of the landslide deformation, as well as the gradual destruction process of the transmission tower in a certain period of time, that is, the destruction model of the earthquake-type landslide of the transmission tower.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for analyzing the safe distance between a transmission tower and an earthquake-type landslide as described in any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for analyzing the safe distance between a transmission tower and an earthquake-type landslide as described in any one of claims 1 to 6 is implemented.

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