Method for evaluating vulnerability of transmission tower foundation by considering rolling stone energy and related equipment

Abstract

The invention discloses a method for evaluating the vulnerability of a transmission tower foundation by considering rolling stone energy and related equipment, and the method comprises the steps: calculating the residual impact resistance energy of the transmission tower foundation after the transmission tower foundation is impacted by rolling stones by analyzing the relationship between the maximum impact resistance energy of the transmission tower foundation and the total lateral shearing force as well as the vertex side displacement when the tower is completely collapsed; a transmission tower vulnerability model is established based on the residual impact resistance energy, and a vulnerability function is obtained; and a vulnerability coefficient is calculated by combining a vulnerability function, and the foundation damage state grade of the transmission tower is determined based on the vulnerability coefficient, so that a basis is provided for evaluating the damage vulnerability of the rolling stone to the transmission tower.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission tower foundation vulnerability assessment, and in particular to a method for assessing the vulnerability of a transmission tower foundation by considering rockfall energy and related equipment. Background Art

[0002] As an important lifeline project with a wide range of applications, transmission lines are one of the lifelines of national economic construction and development. As a carrier of high-load electric energy transmission, the safe operation of transmission lines is of vital importance. As an important national infrastructure, the safe and stable operation of the power system affects the development of the national economy and people's lives. Once a transmission line fails or is damaged, it will cause huge economic losses and trigger various secondary disasters. High-voltage transmission towers are the embodiment of my country's super-strong power system construction capabilities and are important power engineering facilities. Transmission towers often cross the complex topographic and geological conditions of mountainous areas (such as the western mountainous areas of my country). Transmission tower facilities are often selected in high and steep slopes, canyon areas, bank slope terraces, etc. where conditions are relatively suitable. However, the slopes or rock masses in these areas are prone to collapse disasters under the action of long-term geological forces (internal power, external power and other geological effects), resulting in power tower tilting, line breaking, tripping and other power grid accidents.

[0003] The global climate is complex and changeable. Extreme weather has occurred from time to time in recent years, such as heavy rains, long-term droughts, and drought-flood abrupt changes, which have had a certain impact on human production and life. Extreme weather has also exacerbated the frequent occurrence of geological disasters, which directly threatens the overall operation safety of transmission lines and transmission towers. The frequency of serious accidents such as collapse, tilt, and damage of transmission towers has gradually increased, which has also seriously affected the national economy and the lives of the people. In order to ensure the safe operation of transmission lines, studying the vulnerability of transmission tower foundations to geological disasters is the basis for ensuring the safe operation of transmission line tower foundations, and it is also a key issue that urgently needs to be solved.

[0004] Collapse and rockfall disaster is a common type of geological disaster. Under the action of tectonic stress, long-term weathering, unloading, etc., the slope rock mass forms a block controlled by multiple structural planes with different attitudes. The block loses stability under the action of gravity, tilts and falls in the direction of the air, and rolls on the slope, impacting and damaging the structure. It can be seen that the collapse and rockfall disaster poses a huge threat to transmission towers. For the same collapse geological disaster, different types of transmission tower foundations and when the transmission tower foundation is in different positions, the consequences of the disaster are different, and the degree of damage is very different. Therefore, considering the vulnerability assessment of transmission towers is an important measure for effective disaster prevention and mitigation of power grid projects. Vulnerability is an indicator to measure the degree of damage to the transmission tower foundation under the action of collapse disasters. It is related to both the disaster intensity and the disaster resistance performance of the transmission tower foundation itself. Therefore, when evaluating the vulnerability of the transmission pole foundation, it is necessary to consider the joint action relationship between the disaster-causing body and the transmission tower foundation. Therefore, the vulnerability assessment of transmission tower foundations is an important scientific and technological issue that needs to be solved urgently in the current collapse disaster risk assessment.

[0005] At present, there are relatively few studies on the vulnerability of transmission tower foundations to collapse and rockfall disasters. Statistical methods or vulnerability matrix methods that rely on historical data are usually used, which are in the qualitative to semi-quantitative evaluation stage. At the same time, numerical methods such as finite element and discrete element are currently used to calculate the parameters of the vulnerability model, thereby constructing a vulnerability model. However, computer software generalizes or ignores many important geological phenomena and geological conditions, and lacks the judgment of geological experts, resulting in distortion of numerical simulation results, which in turn leads to reduced accuracy of the vulnerability model and inaccurate direct evaluation results, which poses a great safety hazard. Summary of the invention

[0006] Based on the problems raised by the above background technology, the purpose of the present invention is to provide a method and related equipment for assessing the vulnerability of transmission tower foundations considering the energy of rolling stones, which solves the problem that computer software generalizes or ignores many important geological phenomena and geological conditions, lacks the judgment of geological experts, and leads to distortion of numerical simulation results, thereby reducing the accuracy of the vulnerability model and inaccurate direct assessment results.

[0007] The present invention is achieved through the following technical solutions:

[0008] The first aspect of the present invention provides a method for assessing the vulnerability of a transmission tower foundation considering the energy of rolling stones, comprising the following steps:

[0009] Step S1, based on the function-energy relationship of the transmission tower foundation being impacted by collapsed rolling stones, calculating the remaining impact resistance energy of the transmission tower foundation after being impacted by rolling stones;

[0010] Step S2: establishing a transmission tower vulnerability model according to the residual impact resistance energy, and calculating a vulnerability coefficient under the transmission tower vulnerability model;

[0011] Step S3: constructing a transmission tower foundation damage state level based on the vulnerability coefficient, and using the transmission tower foundation damage state level as a rolling stone to evaluate the transmission tower damage vulnerability.

[0012] In the above technical solution, the function-energy relationship data during the rockfall impact process are collected, including but not limited to the data of the impact force changing with time or displacement. The function-energy relationship data are used to calculate the total impact energy of the rockfall on the transmission tower foundation, and the energy that has been converted into deformation energy and dissipated is subtracted from the total impact energy to obtain the residual impact energy of the transmission tower foundation. Based on the function-energy relationship of the transmission tower foundation being impacted by the collapsed rockfall, the deformation energy dissipated when the transmission tower foundation is completely collapsed or destroyed is called the maximum impact energy of the transmission tower foundation, which is used as an indicator of disaster resistance performance. In addition, the impact energy is used as an indicator of disaster intensity. When the impact energy is greater than or equal to the maximum impact energy of the transmission tower foundation, the transmission tower foundation has no residual impact energy, and the transmission tower foundation is completely collapsed by the impact of the collapsed rockfall; when the impact energy is less than the maximum impact energy of the transmission tower foundation, the magnitude of the residual impact energy reflects the vulnerability of the transmission tower foundation.

[0013] On the basis of taking the maximum impact energy of the transmission tower foundation as the disaster resistance performance index and the impact energy as the disaster intensity index, when the impact energy is greater than or equal to the maximum impact energy of the transmission tower foundation, the vulnerability coefficient is equal to 1; when the impact energy is less than the maximum impact energy of the transmission tower foundation, the vulnerability coefficient is equal to the ratio of the impact energy to the maximum impact energy of the transmission tower foundation. Therefore, a quantitative functional relationship between the degree of damage to the transmission tower foundation and the disaster intensity and disaster resistance performance is established as the transmission tower vulnerability model. Using the vulnerability model, the vulnerability coefficient of the transmission tower after being impacted by a rolling stone is calculated. This coefficient can reflect the structural safety and reliability of the transmission tower under a specific impact.

[0014] The vulnerability coefficient calculated through the vulnerability function can reflect the damage level and status of the transmission tower foundation, and is used to evaluate the vulnerability of the transmission tower foundation. It reflects the quantitative relationship of the change in the degree of damage to the overall performance of the transmission tower, which is divided into six damage levels, namely intact, basically intact, slightly damaged, moderately damaged, severely damaged and collapsed. The value range of the vulnerability coefficient is also determined.

[0015] In an optional embodiment, based on the function-energy relationship of the transmission tower foundation being impacted by collapsed rolling stones, the remaining impact resistance energy of the transmission tower foundation after being impacted by rolling stones is calculated, including the following steps:

[0016] Obtain the lateral displacement of the top of the transmission tower foundation and the total lateral shear force of the transmission tower foundation when the tower foundation completely collapses;

[0017] The lateral displacement of the vertex and the total lateral shear force at the time of complete collapse are calculated by using definite integral to obtain the maximum impact resistance of the transmission tower foundation;

[0018] The remaining impact resistance of the transmission tower foundation after being impacted by a rolling stone is calculated according to the maximum impact resistance of the transmission tower foundation.

[0019] In an optional embodiment, a definite integral is used to calculate the vertex lateral displacement, the lateral total shear force and the shadow area during the complete collapse, and the calculation expression is as follows:

[0020]

[0021] In the above formula, E max is the maximum impact resistance of the transmission tower foundation, F is the total lateral shear force of the transmission tower foundation, L x is the lateral displacement of the top of the transmission tower when the foundation collapses, U xmax It is the lateral displacement of the top when the foundation of the transmission tower collapses completely.

[0022] In an optional embodiment, establishing a transmission tower vulnerability model according to the residual impact resistance energy, and calculating a vulnerability coefficient under the transmission tower vulnerability model include the following steps:

[0023] The vulnerability function is established based on the quantitative functional relationship between the degree of damage to the transmission tower foundation and the disaster intensity and disaster resistance performance;

[0024] Taking a rolling stone as a mass point, calculating the impact velocity of the mass point by using an energy method, and calculating the impact energy of the rolling stone at the impact velocity;

[0025] The rock impact energy is combined with the vulnerability function to determine a vulnerability coefficient.

[0026] In an optional embodiment, the vulnerability function is established as follows:

[0027]

[0028] In the above formula, V is the vulnerability function, I is the impact energy of the rolling stone, and E max It is the maximum impact resistance of the transmission tower foundation.

[0029] In an optional embodiment, the rolling stone impact energy is calculated as follows:

[0030]

[0031] In the above formula, f1 and f2 are the friction factors of the slope and horizontal plane respectively; θ is the slope angle; Y is the distance from the transmission tower foundation to the slope foot; H is the drop of the rolling stone's center of mass; and m is the mass of the sliding body.

[0032] A second aspect of the present invention provides a system for assessing the vulnerability of a transmission tower foundation to rockfall energy, the system comprising:

[0033] The residual impact energy calculation module is used to calculate the residual impact energy of the transmission tower foundation after being impacted by the rolling stones based on the function-energy relationship of the transmission tower foundation impacted by the collapsed rolling stones;

[0034] A vulnerability coefficient calculation module, used to establish a transmission tower vulnerability model according to the residual impact resistance energy, and calculate the vulnerability coefficient under the transmission tower vulnerability model;

[0035] An evaluation module is used to construct a transmission tower foundation damage state level based on the vulnerability coefficient, and use the transmission tower foundation damage state level as a rolling stone to evaluate the transmission tower damage vulnerability.

[0036] In an optional embodiment, the vulnerability coefficient calculation module includes:

[0037] A vulnerability function unit is used to establish a vulnerability function based on the quantitative functional relationship between the degree of damage to the foundation of the transmission tower and the disaster intensity and disaster resistance performance;

[0038] An impact energy calculation unit, used to take a rolling stone as a mass point, calculate the impact velocity of the mass point by using an energy method, and calculate the impact energy of the rolling stone at the impact velocity;

[0039] The vulnerability coefficient unit is used to combine the rock rolling impact energy with the vulnerability function to determine a vulnerability coefficient.

[0040] A third aspect of 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 when the processor executes the program, a method for assessing the vulnerability of a transmission tower foundation taking into account the energy of rolling rocks is implemented.

[0041] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for assessing the vulnerability of a transmission tower foundation to rockfall energy.

[0042] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0043] Based on the relationship between the work done by impact force and deformation energy during the impact damage of rolling stones on the foundation of transmission towers, the work done by impact force (impact energy) is used as the disaster intensity index, and the deformation resistance of the transmission tower foundation is used as the disaster resistance performance index. A quantitative assessment model for the vulnerability of transmission tower foundations is established, which can be used for the vulnerability assessment of transmission tower foundations to collapse disasters and has important engineering use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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:

[0045] Figure 1 A schematic diagram of the damage mode of a transmission tower caused by collapsed rocks provided in Example 1 of the present invention;

[0046] Figure 2 The basic function-capability relationship of the transmission tower provided in Example 1 of the present invention;

[0047] Figure 3 The method for calculating the maximum impact energy Emax of the transmission tower foundation provided in Example 1 of the present invention;

[0048] Figure 4 A schematic diagram of a finite element analysis simulation structure of a transmission tower foundation provided in Example 1 of the present invention;

[0049] Figure 5 A schematic diagram of the structure of an electronic device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0050] 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.

[0051] Example 1

[0052] Embodiment 1 of the present invention provides a method for assessing the vulnerability of a transmission tower foundation considering the energy of rolling stones, the method comprising the following steps:

[0053] Step S1, based on the function-energy relationship of the transmission tower foundation being impacted by collapsed rolling stones, calculating the remaining impact resistance energy of the transmission tower foundation after being impacted by rolling stones;

[0054] Step S2: establishing a transmission tower vulnerability model according to the residual impact resistance energy, and calculating a vulnerability coefficient under the transmission tower vulnerability model;

[0055] Step S3: constructing a transmission tower foundation damage state level based on the vulnerability coefficient, and using the transmission tower foundation damage state level as a rolling stone to evaluate the transmission tower damage vulnerability.

[0056] It should be noted that the collapse disaster process can be divided into two situations. One situation is that the transmission tower is on the collapse body. Once the collapse body becomes unstable, the transmission tower is completely damaged. Therefore, there is no need to study the vulnerability in this situation. The other situation is that the transmission tower is a certain distance away from the collapse body, and the collapse disaster is at a relatively high position. The tower may be damaged by rolling stones. Figure 1 As shown in the figure, the failure mode of the transmission tower foundation can be simplified to the impact damage of rolling stones on the transmission tower foundation. It can be further simplified to the failure model of the transmission tower foundation under the static state under the horizontal thrust. Taking the transmission tower foundation as a whole, the damage mode is simplified to the cantilever component under the lateral impact. Figure 2 As shown in the figure, the total lateral shear force-vertex displacement curve of the transmission tower foundation is the constitutive relationship curve of the generalized elastic-plastic model.

[0057] Among them, in the process of the rolling stone impacting the transmission tower foundation, the impact force does work to gradually convert the impact energy into the deformation energy of the transmission tower foundation. Due to the irreversible plastic deformation, the deformation energy is gradually dissipated, causing the transmission tower foundation to be damaged until it collapses. Therefore, this method collects the function-energy relationship data during the rolling stone impact process, including but not limited to the data of the impact force changing with time or displacement, and uses the function-energy relationship data to calculate the total impact energy of the rolling stone on the transmission tower foundation. The total impact energy is deducted from the energy that has been converted into deformation energy and dissipated, and the residual impact energy of the transmission tower foundation can be obtained. Based on the function-energy relationship of the transmission tower foundation impacted by the collapsed rolling stone, the deformation energy dissipated when the transmission tower foundation completely collapses or is destroyed is called the maximum impact energy of the transmission tower foundation, which is used as an indicator of disaster resistance performance. In addition, the magnitude of the impact energy is used as an indicator of disaster intensity. When the impact energy is greater than or equal to the maximum impact energy of the transmission tower foundation, the transmission tower foundation has no residual impact energy. At this time, the transmission tower foundation is completely collapsed by the impact of landslide and rolling stones. When the impact energy is less than the maximum impact energy of the transmission tower foundation, the size of the residual impact energy reflects the fragility of the transmission tower foundation.

[0058] On the basis of taking the maximum impact energy of the transmission tower foundation as the disaster resistance performance index and the impact energy as the disaster intensity index, when the impact energy is greater than or equal to the maximum impact energy of the transmission tower foundation, the vulnerability coefficient is equal to 1; when the impact energy is less than the maximum impact energy of the transmission tower foundation, the vulnerability coefficient is equal to the ratio of the impact energy to the maximum impact energy of the transmission tower foundation. Therefore, a quantitative function relationship between the degree of damage to the transmission tower foundation and the disaster intensity and disaster resistance performance can be established, and this quantitative function can be used as the vulnerability model of the transmission tower. Using the vulnerability model, the vulnerability coefficient of the transmission tower after being impacted by a rolling stone is calculated. This coefficient reflects the structural safety and reliability of the transmission tower under a specific impact.

[0059] The vulnerability coefficient calculated through the vulnerability function can reflect the damage level and status of the transmission tower foundation, and is used to evaluate the vulnerability of the transmission tower foundation. It reflects the quantitative relationship between the change in the degree of damage to the overall performance of the transmission tower.

[0060] According to the degree of damage, the present invention divides the damage level into six levels and proposes the value ranges of the vulnerability coefficients of the six damage levels.

[0061] In an optional embodiment, based on the function-energy relationship of the transmission tower foundation being impacted by collapsed rolling stones, the remaining impact resistance energy of the transmission tower foundation after being impacted by rolling stones is calculated, including the following steps:

[0062] Obtain the lateral displacement of the top of the transmission tower foundation and the total lateral shear force of the transmission tower foundation when the tower foundation completely collapses;

[0063] The lateral displacement of the vertex and the total lateral shear force at the time of complete collapse are calculated by using definite integral to obtain the maximum impact resistance of the transmission tower foundation;

[0064] The remaining impact resistance of the transmission tower foundation after being impacted by a rolling stone is calculated according to the maximum impact resistance of the transmission tower foundation.

[0065] In an optional embodiment, a definite integral is used to calculate the vertex lateral displacement, the lateral total shear force and the shadow area during the complete collapse, and the calculation expression is as follows:

[0066]

[0067] In the above formula, E max is the maximum impact resistance of the transmission tower foundation, F is the total lateral shear force of the transmission tower foundation, L x is the lateral displacement of the top of the transmission tower when the foundation collapses, U xmax It is the lateral displacement of the top when the foundation of the transmission tower collapses completely.

[0068] It should be noted that in the process of the rolling stone impacting the transmission tower foundation, the impact force does work and gradually converts the impact energy into the deformation energy of the transmission tower foundation. Due to the irreversible plastic deformation, the deformation energy is gradually dissipated, which causes the transmission tower foundation to be damaged until it collapses. According to mathematical analysis, the impact energy on the transmission tower foundation is numerically equal to the definite integral of the impact force within the lateral displacement range of the vertex when the transmission tower foundation collapses completely. That is, it can be calculated by Figure 3 The shaded area under the force-displacement curve is used to calculate the definite integral, and the process is as follows:

[0069]

[0070] Furthermore, the remaining impact resistance of the transmission tower foundation after being impacted by a rolling stone is calculated according to the maximum impact resistance of the transmission tower foundation. Then, the remaining impact resistance of the transmission tower foundation after being impacted by a rolling stone is expressed as:

[0071]

[0072] Ignoring the internal energy dissipation of the rolling stone during the impact process, the kinetic energy of the impact body is completely converted into impact energy:

[0073]

[0074] In the above formula, I is the impact energy of the rolling stone, m is the mass of the rolling stone, and v is the impact velocity of the rolling stone.

[0075] In an optional embodiment, establishing a transmission tower vulnerability model according to the residual impact resistance energy, and calculating a vulnerability coefficient under the transmission tower vulnerability model include the following steps:

[0076] The vulnerability function is established based on the quantitative functional relationship between the degree of damage to the transmission tower foundation and the disaster intensity and disaster resistance performance;

[0077] Taking a rolling stone as a particle, calculating the impact velocity of the particle by using an energy method, and calculating the impact energy of the rolling stone at the impact velocity;

[0078] The rock impact energy is combined with the vulnerability function to determine a vulnerability coefficient.

[0079] It should be noted that in this step, a transmission tower vulnerability model was established, the expression of the vulnerability function was obtained, and the calculation of the impact energy considering horizontal friction factors, rockfall impact velocity, slope angle, distance from the transmission tower foundation to the slope foot, rockfall center of mass drop, and rockfall mass was proposed.

[0080] In an optional embodiment, the vulnerability function is established as follows:

[0081]

[0082] In the above formula, V is the vulnerability function, I is the impact energy of the rolling stone, and E max It is the maximum impact resistance of the transmission tower foundation.

[0083] Specifically, the vulnerability function can be expressed as:

[0084]

[0085] Substituting formula (3) into formula (4), we can obtain:

[0086]

[0087] Formula (5) is the required vulnerability function. According to dimensional analysis, the vulnerability coefficient V is dimensionless.

[0088] In an optional embodiment, the rolling stone impact energy is calculated as follows:

[0089]

[0090] In the above formula, f1 and f2 are the friction factors of the slope and horizontal plane respectively; θ is the slope angle; Y is the distance from the base of the transmission tower to the foot of the slope; H is the drop of the center of mass of the rolling stone; mm is the mass of the rolling stone, and g is the acceleration of gravity.

[0091] Furthermore, the mass of the boulder m=ρA, ρ is the density of the boulder, and A is the volume of the boulder.

[0092] It should be noted that after establishing the vulnerability function, it is necessary to derive the calculation of the impact energy of the rockfall. The rockfall is regarded as a particle and the energy method is used to calculate the impact velocity of the rockfall without considering the internal energy dissipation. This method is only applicable to some special landslides.

[0093] The impact energy is equal to the original gravitational potential energy of the rolling stone minus the work done by friction, that is:

[0094]

[0095] Substituting formula (6) into formula (5) yields:

[0096]

[0097] Formula (7) is the transmission tower foundation vulnerability function under the simplified rolling stone motion model.

[0098] The above vulnerability function is a combination of the energy method for calculating the speed of rolling stones. It considers the main factors that can reflect the disaster intensity under simplified conditions (such as horizontal friction factors, rolling stone impact speed, slope angle, distance from the transmission tower foundation to the slope foot, and the drop of the center of mass of rolling stones), and then considers the quantitative relationship between disaster resistance factors and vulnerability, thereby obtaining a model that can be used to evaluate the vulnerability of rolling stones to the transmission tower foundation.

[0099] Furthermore, this embodiment provides a comparison table of the damage status levels of transmission tower foundations as shown in Table 1 below:

[0100] Table 1 Comparison table of damage status of transmission tower foundation

[0101]

[0102] This embodiment takes the transmission tower foundation under a small collapse as an example to implement a method for assessing the vulnerability of the transmission tower foundation considering the energy of rolling stones and demonstrate its technical effect.

[0103] Specifically, Figure 1 As shown, the slope height H = 40m, the slope θ = 47°, and the rolling stone density ρ = 2800kg / m 3 The average friction coefficient f1 of the collapse path is 0.5, and the average f2 is 1.2; the volume of the rolling stone is 500m 3 The distance between the transmission tower foundation and the slope foot is Y=17m. The transmission tower foundation is a pile foundation, using a reinforced concrete frame structure, with a concrete strength grade of C30 and a reinforcement material of Q235.

[0104] First, the failure process of the transmission tower foundation is analyzed, in which lateral force is applied to the structure until the plastic hinges of the bottom column of the structure reach a complete failure state. The changes in the total shear force and lateral displacement of the bottom layer of the structure during the failure of the transmission tower foundation are recorded. According to the deformation of the transmission tower foundation and whether the overall stiffness of the transmission tower foundation is consistent with the actual situation, it is judged whether there is a need for vulnerability assessment and the correctness of the calculation.

[0105] If there is a need for vulnerability assessment, the maximum impact energy of the transmission tower foundation is calculated. First, establish Figure 3 The finite element numerical analysis model of the transmission tower foundation shown in the figure replaces the entire elastic domain with infinite degrees of freedom with a collection of a series of regions with a finite number of finite sizes and connected to each other only at a finite number of points. The overall structure uses the node displacement parameters as the basic unknowns. Secondly, the balance of the unit is considered. A function is set in the unit area to represent the displacement of any point changing with position. The basic equation of the unit is established using the energy principle. All units are then brought together for overall force analysis, and a set of multivariate algebraic equations with node displacement parameters as the basic unknowns is obtained. The node displacement parameters can be solved in combination with the displacement boundary conditions. After solving the node displacement parameters, the strain and stress of any point in the elastic domain can be obtained based on the unit displacement interpolation function and the basic equation of elasticity theory.

[0106] Through the above finite element method, the total shear force-vertex displacement curve of the transmission tower foundation can be drawn according to the development of the plastic hinge of the transmission tower foundation under each load step. The maximum impact energy of the transmission tower foundation is numerically equal to the work done by the lateral thrust on the transmission tower when the transmission tower is completely damaged, that is, Figure 4 The area under the total shear force-vertex displacement curve when the structure completely collapses.

[0107] In this embodiment, the maximum impact energy of the transmission tower foundation is calculated to be 16000 kJ.

[0108] Finally, calculate the fragility coefficient under constant value conditions. Slope height H = 40m, slope θ = 47°, and rock density ρ = 2800kg / m 3 , the friction coefficient of the collapse path is f1 = 0.5, f2 = 1.2, and the volume of the rolling stone is A = 500m3 , the distance between the transmission tower foundation and the slope foot is Y = 17m. Substituting into formula (6), the impact energy of the collapse rolling stone in this case is I = 14000kJ. Then substituting the impact energy of the collapse rolling stone I = 14000kJ and the maximum impact resistance of the transmission tower foundation 16000kJ into formula (7) for calculation, the vulnerability coefficient V = 0.875 can be obtained. According to the comparison table 1, the damage level of the transmission tower foundation is severe damage, level E.

[0109] Example 2

[0110] Embodiment 2 of the present invention provides a system for assessing the vulnerability of transmission tower foundations considering the energy of rolling stones, the system comprising:

[0111] The residual impact energy calculation module is used to calculate the residual impact energy of the transmission tower foundation after being impacted by the rolling stones based on the function-energy relationship of the transmission tower foundation impacted by the collapsed rolling stones;

[0112] A vulnerability coefficient calculation module, used to establish a transmission tower vulnerability model according to the residual impact resistance energy, and calculate the vulnerability coefficient under the transmission tower vulnerability model;

[0113] An evaluation module is used to construct a transmission tower foundation damage state level based on the vulnerability coefficient, and use the transmission tower foundation damage state level as a rolling stone to evaluate the transmission tower damage vulnerability.

[0114] In an optional embodiment, the vulnerability coefficient calculation module includes:

[0115] A vulnerability function unit is used to establish a vulnerability function based on the quantitative functional relationship between the degree of damage to the foundation of the transmission tower and the disaster intensity and disaster resistance performance;

[0116] An impact energy calculation unit, used to take a rolling stone as a mass point, calculate the impact velocity of the mass point by using an energy method, and calculate the impact energy of the rolling stone at the impact velocity;

[0117] The vulnerability coefficient unit is used to combine the rock rolling impact energy with the vulnerability function to determine a vulnerability coefficient.

[0118] Example 3

[0119] Figure 5 A schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention is shown in FIG. Figure 5 As shown, the electronic device includes a processor 21, a memory 22, an input device 23 and an output device 24; the number of processors 21 in the computer device can be one or more. Figure 5A processor 21 is taken as an example; the processor 21, the memory 22, the input device 23 and the output device 24 in the electronic device can be connected by a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0120] The memory 22 is a computer-readable storage medium that can be used to store software programs, computer executable programs and modules. The processor 21 executes various functional applications and data processing of the electronic device by running the software programs, instructions and modules stored in the memory 22, that is, the method for evaluating the vulnerability of the transmission tower foundation considering the rolling stone energy of Example 1 is implemented.

[0121] The memory 22 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 22 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 22 may further include a memory remotely arranged relative to the processor 21, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0122] The input device 23 can be used to receive the ID and password input by the user, etc. The output device 24 is used to output the network configuration page.

[0123] Example 4

[0124] Embodiment 4 of the present invention further provides a computer-readable storage medium, wherein the computer-executable instructions, when executed by a computer processor, are used to implement the method for assessing the vulnerability of a transmission tower foundation considering the energy of rolling rocks as provided in Embodiment 1.

[0125] An embodiment of the present invention provides a storage medium containing computer executable instructions, and its computer executable instructions are not limited to the method operations provided in Example 1, and can also execute related operations in the method for assessing the vulnerability of transmission tower foundations considering rolling stone energy provided in any embodiment of the present invention.

[0126] 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 assessing the vulnerability of transmission tower foundations considering rockfall energy, characterized in that: The steps include: Step S1, based on the function-energy relationship of the transmission tower foundation being impacted by collapsed rolling stones, calculating the remaining impact resistance energy of the transmission tower foundation after being impacted by rolling stones; Step S2: establishing a transmission tower vulnerability model according to the residual impact resistance energy, and calculating a vulnerability coefficient under the transmission tower vulnerability model; Step S3: constructing a transmission tower foundation damage state level based on the vulnerability coefficient, and using the transmission tower foundation damage state level as a rolling stone to evaluate the transmission tower damage vulnerability.

2. The method for assessing the vulnerability of transmission tower foundations considering rockfall energy according to claim 1, characterized in that: Based on the function-energy relationship of the transmission tower foundation impacted by collapsed rolling stones, the residual impact energy of the transmission tower foundation after being impacted by rolling stones is calculated, including the following steps: Obtain the lateral displacement of the top of the transmission tower foundation and the total lateral shear force of the transmission tower foundation when the tower foundation completely collapses; The lateral displacement of the vertex and the total lateral shear force at the time of complete collapse are calculated by using definite integral to obtain the maximum impact resistance of the transmission tower foundation; The remaining impact resistance of the transmission tower foundation after being impacted by a rolling stone is calculated based on the maximum impact resistance of the transmission tower foundation.

3. The method for assessing the vulnerability of transmission tower foundations considering rockfall energy according to claim 2, characterized in that: The lateral displacement of the vertex, the total lateral shear force and the shadow area during the complete collapse are calculated using definite integrals. The calculation expressions are as follows: In the above formula, E max is the maximum impact resistance of the transmission tower foundation, F is the total lateral shear force of the transmission tower foundation, L x is the lateral displacement of the top of the transmission tower when the foundation collapses, U xmax It is the lateral displacement of the top when the transmission tower foundation collapses completely.

4. The method for assessing the vulnerability of transmission tower foundations considering rockfall energy according to claim 1, characterized in that: Establishing a transmission tower vulnerability model according to the residual impact resistance energy, and calculating a vulnerability coefficient under the transmission tower vulnerability model, comprising the following steps: The vulnerability function is established based on the quantitative functional relationship between the degree of damage to the transmission tower foundation and the disaster intensity and disaster resistance performance; Taking a rolling stone as a particle, calculating the impact velocity of the particle by using an energy method, and calculating the impact energy of the rolling stone at the impact velocity; The rock impact energy is combined with the vulnerability function to determine a vulnerability coefficient.

5. The method for assessing the vulnerability of transmission tower foundations considering rockfall energy according to claim 4, characterized in that: The vulnerability function is established as follows: In the above formula, V is the vulnerability function, I is the impact energy of the rolling stone, and E max It is the maximum impact resistance of the transmission tower foundation.

6. The method for assessing the vulnerability of transmission tower foundations considering rockfall energy according to claim 5, characterized in that: The tumbling stone impact energy is calculated as follows: In the above formula, f1 and f2 are the friction factors of the slope and horizontal plane respectively; θ is the slope angle; Y is the distance from the base of the transmission tower to the foot of the slope; H is the height difference of the center of mass of the rolling stone; and m is the mass of the sliding body.

7. A system for assessing the vulnerability of transmission tower foundations to rockfall energy, characterized in that: include: The residual impact energy calculation module is used to calculate the residual impact energy of the transmission tower foundation after being impacted by the rolling stones based on the function-energy relationship of the transmission tower foundation impacted by the collapsed rolling stones; A vulnerability coefficient calculation module, used to establish a transmission tower vulnerability model according to the residual impact resistance energy, and calculate the vulnerability coefficient under the transmission tower vulnerability model; An evaluation module is used to construct a transmission tower foundation damage state level based on the vulnerability coefficient, and use the transmission tower foundation damage state level as a rolling stone to evaluate the transmission tower damage vulnerability.

8. The system for assessing the vulnerability of transmission tower foundations considering rockfall energy according to claim 7, characterized in that: include: A vulnerability function unit is used to establish a vulnerability function based on the quantitative functional relationship between the degree of damage to the foundation of the transmission tower and the disaster intensity and disaster resistance performance; An impact energy calculation unit, used to take a rolling stone as a mass point, calculate the impact velocity of the mass point by using an energy method, and calculate the impact energy of the rolling stone at the impact velocity; The vulnerability coefficient unit is used to combine the rock rolling impact energy with the vulnerability function to determine a vulnerability coefficient.

9. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for assessing the vulnerability of a transmission tower foundation by taking into account the energy of rolling rocks as claimed in any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the method for evaluating the vulnerability of a transmission tower foundation considering rockfall energy as claimed in any one of claims 1 to 6 is implemented.

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