Method for quantifying damage impact energy of collapsed rockfall or rolling stone to transmission tower

Abstract

The invention discloses a method for quantifying damage impact energy of collapsed rocks or rolling stones to a transmission tower, and relates to the technical field of geological engineering, comprising the following steps: acquiring geological conditions and disaster-gestation conditions of an engineering area according to field geological survey; calculating gravitational potential energy Wt0 at the beginning of movement and kinetic energy Kt0 when the falling stone or the rolling stone and the transmission tower are impacted and damaged; determining the position C0 of a load action point according to the scale and shape of the collapsed rockfall or rolling stone; calculating the overall equivalent lateral bending stiffness EI of the power transmission tower by using a material mechanics theoretical formula according to information such as the structure and the size of the power transmission tower; calculating the magnitude of impact energy; calculating the energy loss generated by the movement of the falling stone or the rolling stone on the rear-section slope; and calculating an impact failure coefficient. The quantification method provides a quantitative basis for evaluation of damage of collapse rockfall or rolling stone impact energy to the transmission tower body, and can be extensively applied to evaluation of impact damage of geological disasters to the transmission tower.

Description

Technical Field

[0001] The invention relates to the field of geological engineering technology, and in particular to a method for quantifying the destructive impact energy of collapsed rocks or rolling stones on a transmission tower. Background Art

[0002] The western mountainous areas have steep terrain, strong tectonic activities, deep valleys, and developed water systems, and the geological environment conditions along the lines are extremely complex. Under the control of complex geological environmental conditions, geological disasters such as landslides, collapses, and mud-rock flows are frequent. The transmission network is a complex system connected by wires and transmission towers. With the increase in the voltage of the transmission line and the expansion of the coverage area of ​​the power grid, the height of the transmission tower is also increasing, the structure becomes complex, and the operation of the power grid is becoming more and more complex. The operation of the power system is not only affected by internal factors of the system, but also by the external environment. Under the influence of geological disasters such as landslides, mud-rock flows, collapses, and ground subsidence, the safe operation of the transmission line is seriously threatened. With the increasing number of power transmission projects in western my country, how to ensure the safety of the transmission tower body and tower foundation when the transmission tower line passes through the mountainous area is an important prerequisite for ensuring the safety of the transmission project. Therefore, the evaluation of the effect of geological disasters on transmission towers under different terrain and geological conditions has important theoretical significance and engineering value.

[0003] In the slope area where the transmission towers are laid, the bedrock at the top of the slope forms joints and fissures of different directions and certain extension lengths due to the structure, weathering and unloading of the rock mass. These joints and fissures are combined and cut to form a certain scale of dangerous rock mass and loose unloaded rock mass, which may collapse and become unstable under the action of gravity, heavy rain or earthquake. In the area with large terrain height difference, the block becomes unstable and forms falling rocks or rolling stones, which roll down along the slope. When the falling rocks or rolling stones reach the vicinity of the transmission towers, they may have the characteristics of different shapes, different volumes, fast speeds and large energy. When such falling rocks or rolling stones with fast speeds and large energy hit the transmission towers, they often cause damage to the tower body or tower foundation of the transmission towers, destroy the transmission facilities, and threaten the safety of construction and maintenance personnel.

[0004] Before selecting the line, site and layout of transmission towers, the traditional method mainly conducts geological surveys and corresponding exploration work along the line according to the existing relevant regulations and specifications, which can basically identify the geological conditions along the line and the development and distribution characteristics of geological disasters, and conduct reasonable engineering geological evaluation of the selected line. However, in high and steep mountainous areas with deep canyons, it is impossible to achieve a comprehensive governance project due to the control of existing exploration means, survey methods and survey accuracy, as well as the high-level dangerous rocks, loose rock masses and even boulders on the slope surface that are randomly developed and distributed on high and steep slopes. Moreover, even stable or basically stable dangerous rock masses may become unstable under the action of heavy rain or accidental earthquakes. That is, despite detailed engineering geological exploration work, the towers of transmission projects in deep canyon areas are still likely to be threatened by high-level collapse and rockfall on the upper part of the slope.

[0005] At present, the study on the impact of collapsed rocks or rolling stones on transmission towers often uses computer software such as ANSYS, FLAC3D and other tools to simulate and analyze their effects. Since computer software generalizes some important geological phenomena and key factors controlling the occurrence of disaster bodies, and the selected calculation parameters have certain errors, the calculation results are inaccurate and cannot be well applied in actual projects. Summary of the invention

[0006] Based on the problem that the existing technology is insufficient in the quantification method of the impact energy of collapsed rocks or rolling stones on transmission towers, the purpose of the present invention is to provide a method for quantifying the impact energy of collapsed rocks or rolling stones on transmission towers. Starting from the evolution of geological disasters, energy evolution and the movement characteristics of rolling stones, the impact energy of high-position dangerous rocks, collapsed rocks or rolling stones rolling along the slope to the vicinity of the front edge transmission tower after instability is considered, and a reliable quantitative evaluation method for the impact energy of rolling stones on transmission towers is established. The method has good application value and promotion value, and provides a reference for personnel in the fields of engineering geology and geological disasters or for some geologists engaged in the line and site selection of transmission towers.

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

[0008] In a first aspect, the present application provides a method for quantifying the impact energy of rockfall or rolling stones on transmission towers, comprising the following steps:

[0009] According to the on-site geological survey, the geological conditions and disaster-prone conditions of the project area are obtained, and the gravitational potential energy W at the beginning of the movement is calculated. t0 The kinetic energy K when the falling rock or rolling stone impacts the transmission tower t0 ;

[0010] Determine the load action point C0 according to the scale and shape of the collapsed rocks or rolling stones;

[0011] According to the structure, size and other information of the transmission tower, the overall equivalent lateral bending stiffness EI of the transmission tower is calculated using the material mechanics theory formula;

[0012] Calculate the impact energy;

[0013] Calculate the energy loss caused by the movement of falling rocks or rolling rocks on the slope of the accumulation area;

[0014] Calculate the impact damage coefficient.

[0015] Furthermore, the on-site geological survey includes obtaining information on topography, stratum lithology, geological structure, groundwater, slope structural characteristics, overall slope characteristics, rock mass structure, weathering, joint and fissure development characteristics, the location of potential landslides or rockfalls, the block diameter and volume of rockfalls or rockfalls, the distance of landslides or rockfalls from transmission towers, and the foundation conditions of transmission towers (coordinates, tower height, tower structure type, foundation type and burial depth, etc.).

[0016] Furthermore, methods for calculating gravitational potential energy and kinetic energy include energy method, analytical method or numerical simulation method.

[0017] Furthermore, the gravitational potential energy W at time t0 is t0 The calculation formula is:

[0018] Among them, E total = mgh, m is the mass of the rockfall or rolling stone, g is the acceleration of gravity, and h is the height of the center of mass of the rockfall or rolling stone before it separates from the parent rock; E t0 W is the gravitational potential energy released during the time from 0 to t0; t0 is the gravitational potential energy of the collapsed rocks or rolling stones at time t0;

[0019] Kinetic Energy K t0 The calculation formula is:

[0020] Among them, A t0 K is the energy consumed by the internal friction of falling rocks or rolling stones; t0 K is the kinetic energy of the rockfall or rolling stone when it hits the ground. t1 E is the kinetic energy of the impact of collapsed rocks or rolling stones on the transmission tower, t1 is the gravitational potential energy released from 0 to t1, A t1-t0 B is the energy consumed by the internal friction collapse of the transmission tower after hitting the ground and before impacting it. t0 is the energy dissipated when the falling rock or rolling stone hits the ground from 0 to t0, C t1 It is the energy dissipated by friction between falling rocks or rolling stones and the slope surface before they impact the transmission tower during the time period from 0 to t1.

[0021] Furthermore, the calculation formula of impact energy is:

[0022]

[0023] Where I0 is the impact energy of falling rocks or rolling stones, R max is the maximum impact resistance of the transmission tower, K t0 is the kinetic energy of the collapsed rock or rolling stone when it hits the ground, E total E is the total energy released during the falling, rolling and impact of rockfall or rolling rocks. t0 is the gravitational potential energy released from 0 to t0, m is the mass of the falling rock or rolling stone, g is the gravitational acceleration, h is the center of mass height of the falling rock or rolling stone before separation from the parent rock, μ1 is the bottom friction factor of the rear section of the slope, μ2 and μ3 are the bottom friction factors of the middle section and the front section of the slope respectively.

[0024] Furthermore, the energy loss caused by the movement of falling rocks or rolling rocks on the slope of the accumulation distribution area is calculated as follows:

[0025] P = mgL (μ1 + μ2 + μ3) / 3;

[0026] Among them, μ1 is the bottom friction factor of the rear slope, μ2 and μ3 are the bottom friction factors of the middle and front slopes respectively, P is the total energy lost by the falling rocks or rolling stones in the entire accumulation distribution area after hitting the ground, L is the horizontal distance from the position where the falling rocks or rolling stones hit the slope ground to the tower, m is the mass of the falling rocks or rolling stones, and g is the acceleration of gravity.

[0027] Furthermore, the calculation formula for the impact damage coefficient is:

[0028]

[0029] Among them, ξ is the impact damage coefficient, c0 is the position of the load application point, EI is the equivalent lateral bending stiffness of the transmission tower, T1 is the impact force of falling rocks or rocks on the transmission tower during the impact process, and K t0 is the kinetic energy of the collapsed rock or rolling stone when it hits the ground, W t0 It is the gravitational potential energy of the collapsed rocks or rolling stones at time t0.

[0030] In a second aspect, the present application provides a computer program, which can implement the steps of any one of the methods described above.

[0031] In a third aspect, the present application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, enables the processor to perform the steps of any one of the methods described above.

[0032] In a fourth aspect, the present application provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of any one of the methods described above.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] The present invention starts with the evolution of geological disasters, energy evolution and the movement characteristics of rolling stones, considers the impact energy of high-position dangerous rocks, collapsed rocks or rolling stones rolling along the slope to the vicinity of the front edge transmission tower after instability, and establishes a reliable quantitative evaluation method for the impact energy of rolling stones on transmission towers. The method has good application value and promotion value, and provides a reference for personnel in the fields of engineering geology and geological disasters or for some geologists engaged in the line and site selection of transmission towers. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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:

[0036] Figure 1 It is a schematic diagram of the process of dangerous rock mass collapse-rolling-impacting to destroy the transmission tower in the present invention;

[0037] Figure 2 The total energy release and kinetic energy change curves during the rockfall or rockfall disaster in the present invention;

[0038] Figure 3 It is a schematic diagram of the process of impact energy generation during the movement of rockfall or rolling stones in the present invention;

[0039] Figure 4 A schematic diagram of the process of falling rocks or rolling stones impacting a transmission tower in the present invention;

[0040] Figure 5 It is a schematic diagram of slope division in the process of dangerous rock mass collapse-rolling-impact destruction of transmission tower in the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0042] The following describes in detail the embodiments of the present application that are specifically disclosed, with appropriate reference to the drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there are cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present application, and are not intended to limit the subject matter described in the claims. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0044] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0045] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0046] Example 1

[0047] This embodiment provides a method for quantifying the destructive impact energy of collapsed rocks or rolling stones on transmission towers. Based on the energy consumption mechanism of the impact process of collapsed rocks or rolling stones on transmission towers, a calculation formula for the impact energy of collapsed rocks is proposed, and an indicator characterizing the degree of damage to transmission towers caused by the impact energy, namely the impact damage coefficient, is defined.

[0048] Dangerous rock mass is a potential dangerous and hazard-ridden rock mass that collapses under the control of long-term weathering, unloading, cutting by structural surfaces, and combination. The effect of rockfall or rolling stones on transmission towers caused by collapse can be divided into two processes. The first is the process in which the blocks cut by structural surfaces in the collapsed dangerous rock mass are separated from the parent body and collapse toward the free surface; the second is the impact and damage process of collapse, rockfall or rolling stones on transmission towers. After the collapse and instability, a part of the rocks accumulate at the foot of the slope, and some rocks with large energy and moderate size roll forward and hit the transmission towers with greater energy, causing impact and damage to the transmission towers. Figure 1 shown.

[0049] The specific method is:

[0050] S1. Carry out engineering geological surveys in the on-site transmission tower layout area, identify the engineering geological conditions of the transmission tower erection location, obtain basic geological information such as topography, stratum lithology, geological structure, groundwater, and identify the slope structure characteristics (forward, reverse, tangential), overall slope characteristics (slope height, slope, free surface characteristics, plane shape, profile shape, etc.), rock mass structure, weathering, joint and fissure development characteristics, etc. Determine the location of potential collapsed rocks or rolling stones, and measure the block diameter and volume of the rocks or rolling stones. Measure the distance between the collapsed rocks or rolling stones and the transmission tower, and the basic conditions of the transmission tower.

[0051] S2. A model of the impact energy change of rockfall or rolling stones was established to determine the energy conversion process.

[0052] Collapsed rocks or rolling rocks are a type of geological disaster in which the rock and soil mass controlled by a certain structural surface is torn, dumped and separated from the parent body under the action of gravity in the direction of the air. In order to discuss the changing law of the impact energy generated by the dangerous rock mass during the collapse process, the evolution process of its energy is analyzed. During the collapse of the dangerous rock mass, its gravitational potential energy gradually decreases from its maximum value, while the kinetic energy gradually increases from 0. During the collapse process, the kinetic energy is relatively large, hitting the ground (part of the impact energy is converted into internal energy) and rolling towards the foot of the slope. When the falling rocks or rolling rocks roll to the front edge of the slope and contact the transmission tower, the remaining impact energy is converted into internal energy, causing certain damage or destruction to the transmission tower, and the energy gradually decreases to 0.

[0053] Figure 2 As shown in Figure 1, the relationship curve between total energy, kinetic energy and time in the process of landslide or rockfall disaster. In the figure, at time t0, the rockfall or rockfall hits the ground, at time t1, the landslide or rockfall contacts the transmission tower and an impact occurs, and at time t2, the impact ends.

[0054] Figure 2 It can be seen that in the whole process, the total energy of the collapsed rocks or rolling stones is greater than the kinetic energy, indicating that the gravitational potential energy of the dangerous rock mass before the collapse occurs is converted into kinetic energy while being released, and the other part is dissipated due to the falling and rolling of the rocks or rolling stones. The ways of dissipating energy include: (1) the energy consumed by the friction between the dangerous rock mass and the parent body; (2) the energy consumed by the internal friction and collision when the collapsed rocks or rolling stones decompose; (3) the energy loss caused by the rocks or rolling stones hitting the ground; (4) the energy consumed by the rocks or rolling stones rolling on the slope and the friction with the slope; (5) the energy consumed by the rocks or rolling stones hitting the transmission tower body, such as Figure 3 shown.

[0055] According to the above analysis, the parameters in the process of rockfall or rolling disasters satisfy the following relationship:

[0056] E total =mgh (1)

[0057]

[0058] In formulas (1) to (4), E total K is the total energy released during the falling, rolling and impact process of rockfall or rockfall. m is the mass of rockfall or rockfall, g is the acceleration of gravity, h is the height of the center of mass of rockfall or rockfall before it separates from the parent rock; t0 K is the kinetic energy of the rockfall or rolling stone when it hits the ground. t1 E is the kinetic energy of the impact of collapsed rocks or rolling stones on the transmission tower, t0 is the gravitational potential energy released from 0 to t0, E t1 is the gravitational potential energy released from 0 to t1, A t0 A is the energy consumed by the internal friction of falling rocks or rolling stones. t1-t0 B is the energy consumed by the internal friction collapse of the transmission tower after hitting the ground and before impacting it. t0 is the energy dissipated when the falling rock or rolling stone hits the ground from 0 to t0, C t1 W is the energy dissipated by friction between falling rocks or rolling rocks and the slope surface before impacting the transmission tower during the period from 0 to t1, t0 It is the gravitational potential energy of the collapsed rocks or rolling stones at time t0.

[0059] S3. Establish an expression for the energy loss caused by falling rocks during slope instability and propose a formula for calculating impact energy, which provides a quantitative basis for calculating the impact energy of falling rocks or rolling rocks on the tower body of a transmission tower.

[0060] During the impact, due to the impact force, the transmission tower is deformed and damaged, and the kinetic energy is converted into deformation energy. At the same time, as the deformation continues to increase, the transmission tower undergoes plastic deformation and cannot be restored, eventually leading to the destruction of the transmission tower. The impact energy at this time becomes the maximum impact resistance energy R of the transmission tower. max , is the inherent characteristic of the transmission tower itself, and is closely related to the type, structure, and material properties of the transmission tower. Therefore, the calculation formula for impact energy can be expressed as follows:

[0061]

[0062] B t1-t0 is the energy dissipated after the falling rock or rolling stone hits the ground from t0 to t1; R max is the maximum impact energy that the transmission tower can withstand, and I0 is the impact energy of falling rocks or rolling stones. Substituting (4) into (5), we can get

[0063]

[0064] I0 is the index of the final demand solution and is an important basis for quantitatively evaluating the impact of rockfall or rolling rocks on transmission towers. In formula (6), K t0 、E total and E t0 can be obtained according to various calculation methods based on the engineering geological conditions of rockfall or rockfall. Therefore, the key to calculating I0 is A t1-t0 A t1-t0 With A t0 The difference between the two is that the latter is the internal energy dissipation caused by the separation and rupture of the falling rocks or rolling rocks from the parent rock before they hit the ground, while the former is the energy loss caused by the friction with the slope after hitting the ground. Figure 4 As shown in the figure, during the impact process, both the collapsed rockfall or rolling stone and the transmission tower are nonlinear systems with complex elastic-plastic properties, which makes the calculation of the former more complicated. It is generally believed that the motion analysis of the rockfall or rolling stone can be regarded as a rigid body, that is, ignoring its internal friction energy consumption, and the expression of the impact energy is:

[0065]

[0066] If the impact energy is calculated according to formula (7), a large error will inevitably occur, because falling rocks or rolling stones will inevitably lose a certain amount of energy when rolling on the slope.

[0067] Assume that the horizontal distance between the position where the rockfall or rolling stone hits the slope ground (impact point) and the tower is L, the mass of the rockfall or rolling stone is m, and the slope angle can be roughly divided into three sections. The angle between the slope surface and the horizontal direction in the rear section is θ1, and the angle between the slope surface line in the middle section and the horizontal direction is θ 2， The angle between the front slope surface and the horizontal direction is θ3. Assuming that the horizontal distances of the front, middle and rear sections are equal, the distance that the falling rock or rolling stone moves from the slope surface to the transmission tower after hitting the ground can be expressed as L /

[0068] (cosθ1+cosθ2+cosθ3), the vertical height difference (center of mass height) between the impact point and the slope foot is h'=L(tanθ1+tanθ2+tanθ3), then the energy loss caused by the movement of falling rocks or rolling rocks on the slope of the accumulation distribution area can be expressed as:

[0069] P1=μ1mgcosθ1·(L / 3cosθ1)=mgLμ1 / 3 (8)

[0070] Among them, μ1 is the bottom friction factor of the rear slope; P1 is the energy lost by falling or rolling rocks on the rear slope;

[0071] Similarly, the energy lost by falling or rolling rocks in the middle and front sections of the slope is the same as that in formula (8), except for the bottom friction factor and the angle between the slope surface line and the horizontal direction.

[0072] Therefore, the energy lost by a falling rock or rolling stone after it hits the ground and before it hits the transmission tower can be expressed as:

[0073] P = mgL (μ1 + μ2 + μ3) / 3 (9)

[0074] In the above formula, μ2 and μ3 are the bottom friction factors of the middle and front sections of the slope respectively; P is the total energy lost by the falling rocks or rolling stones in the entire accumulation distribution area after hitting the ground; therefore, A t1-t0 =P=mgL(μ1+μ2+μ3) / 3.

[0075] Therefore, the impact energy calculation formula can be calculated using the following formula.

[0076]

[0077] S4. Determine the evaluation index of the impact damage to transmission towers caused by rock collapse or rolling rocks, namely the impact damage coefficient, and propose a calculation method for the impact damage coefficient.

[0078] Assume that T1 is the impact force of falling rocks or rolling stones on the transmission tower during the impact process, T2 is the force of the transmission tower on the falling rocks or rolling stones during the impact process, and the vertical transmission tower is regarded as a cantilever beam. The variable performance of the elastic cantilever beam is W b (equivalent to impact energy I0) is:

[0079]

[0080] In the formula, c0 is the position of the load point, which is approximately equal to 1 / 2 of the diameter of the falling rock or rolling stone, EI is the equivalent lateral bending stiffness of the transmission tower, T1 and T2 are a pair of couples, and T1 = T2. Using the simplified asymptote calculation method of the cantilever beam, it can be seen that:

[0081] Order I 02 The impact energy of falling rocks or rolling stones is not considered because of the internal friction that dissipates the internal energy during the impact.

[0082]

[0083] Taking the two impact energies as the quotient, we get:

[0084]

[0085] ξ is the impact damage coefficient. The larger the ξ is, the smaller the internal friction dissipation of the falling or rolling rocks is, which also indicates that the transmission tower has better stability, smaller impact energy, and less damage; the smaller the ξ is, the greater the internal friction dissipation of the falling or rolling rocks is, the greater the impact energy is, which indicates that the transmission tower is more damaged. In addition, the impact damage coefficient is only related to the ratio of the equivalent lateral bending stiffness of the transmission tower to the deformation modulus of the falling or rolling rocks, that is, it is only related to the degree of difference between the characteristics of the transmission tower and the falling or rolling rocks. It also shows that the impact energy and the internal energy dissipation of the falling or rolling rocks are only related to the degree of difference between the deformation characteristics of the transmission tower and the falling or rolling rocks, and have nothing to do with the specific values ​​of the deformation modulus and the equivalent lateral bending stiffness. Its size is determined by the falling or rolling rocks and the transmission tower. The smaller the impact damage coefficient is, the more fragile the transmission tower is relative to falling rocks or rolling stones, the greater the impact energy is, and the smaller the internal energy consumption of falling rocks or rolling stones is; the larger the impact damage coefficient is, the stronger the affected body is relative to the sliding body, the smaller the impact energy is, and the greater the internal energy consumption of the sliding body is.

[0086] High-altitude rockfall or rockfall is affected by many factors. After the rockfall or rockfall occurs, it rolls over the slope surface to the front edge of the slope and is damaged by pairs of transmission towers. Therefore, studying the extent of the damage caused by rockfall or rockfall on transmission towers is a current cutting-edge issue. However, there is still a lack of calculation methods for evaluating the impact energy of rockfall or rockfall on transmission towers. With the increase in my country's infrastructure investment and construction capacity, the increase in transmission towers may lead to more geological disasters threatening the safety of transmission towers. Therefore, the method for quantifying the impact energy of rockfall or rockfall on transmission towers proposed in the present invention has important practical value and is worth promoting.

[0087] The present invention analyzes the impact energy of rockfall or rockfall disasters on transmission towers. First, the energy distribution of rockfall or rockfall disasters from high position falling, rolling, impacting transmission towers, and tower destruction is proposed, and several important stages are divided into unstable collapse, hitting the ground, and impact destruction. An impact energy calculation formula is proposed to provide a quantitative basis for the evaluation of the impact energy of rockfall or rockfall on the transmission tower body, and an evaluation index for the impact damage of rockfall or rockfall on dangerous rock bodies, namely the impact damage coefficient, is proposed, and a calculation method for the impact damage coefficient is proposed. It can be extended to the evaluation of the impact damage of geological disasters on transmission towers, and provide an important basis for regional development, urban construction land planning, project site selection, and disaster prevention and mitigation measures.

[0088] Example 2

[0089] This embodiment provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of a method for quantifying the impact energy of collapsed rocks or rolling stones on a transmission tower in the above-mentioned embodiment 1.

[0090] The computer device may be a desktop computer, a notebook, a PDA, a cloud server, etc. The computer device may interact with the user through a keyboard, a mouse, a remote control, a touch pad, or a voice control device.

[0091] The storage includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (for example, SD or D interface display memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the memory can be an internal storage unit of the computer device, for example, a hard disk or memory of the computer device. In other embodiments, the memory can also be an external storage device of the computer device, such as a plug-in hard disk equipped on the computer device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), etc. Of course, the memory can also include both the internal storage unit of the computer device and an external storage device. In this embodiment, the memory is often used to store the operating system and various application software installed on the computer device, such as the program code for running the method for quantifying the impact energy of collapse rocks or rolling stones on the transmission tower. In addition, the memory may also be used to temporarily store various types of data that have been output or are to be output.

[0092] In some embodiments, the processor may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor is generally used to control the overall operation of the computer device. In this embodiment, the processor is used to run the program code stored in the memory or process data, such as running the program code of the method for quantifying the impact energy of rockfall or rolling stones on the transmission tower.

[0093] Example 3

[0094] This embodiment provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of a method for quantifying the impact energy of collapsed rocks or rolling stones on transmission towers in the above-mentioned embodiment 1.

[0095] The computer-readable storage medium stores an interface display program, and the interface display program can be executed by at least one processor so that the at least one processor executes the steps of a method for quantifying the impact energy of collapsed rocks or rolling stones on transmission towers in the above-mentioned embodiment 1.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 The steps for the functions specified in one or more boxes.

[0100] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server or network device, etc.) to execute the methods described in each embodiment of the present application.

[0101] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0102] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only the specific embodiments 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. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present application is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present application.

Claims

1. A method for quantifying the impact energy of rockfall or rolling stones on transmission towers, characterized in that: The following steps are involved: According to the on-site geological survey, the geological conditions and disaster-prone conditions of the project area are obtained, and the gravitational potential energy W at the beginning of the movement is calculated. t0 The kinetic energy K when the falling rock or rolling stone impacts the transmission tower t0 ; Determine the load action point C0 according to the scale and shape of the collapsed rocks or rolling stones; According to the structure, size and other information of the transmission tower, the overall equivalent lateral bending stiffness EI of the transmission tower is calculated using the material mechanics theory formula; Calculate the impact energy; Calculate the energy loss caused by the movement of falling rocks or rolling rocks on the slope of the accumulation area; Calculate the impact damage coefficient.

2. A method for quantifying the impact energy of rockfall or rolling stones on transmission towers according to claim 1, characterized in that: The on-site geological survey includes obtaining information on topography, stratum lithology, geological structure, groundwater, slope structural characteristics, overall slope characteristics, rock mass structure, weathering, joint and fissure development characteristics, the location of potential rockfall or rockfall, the diameter and volume of rockfall or rockfall, the distance of rockfall or rockfall from the transmission tower, and the foundation conditions of the transmission tower.

3. The method for quantifying the impact energy of rockfall or rolling stones on transmission towers according to claim 1, characterized in that: Methods for calculating gravitational potential energy and kinetic energy include energy method, analytical method or numerical simulation method.

4. The method for quantifying the impact energy of rockfall or rolling stones on transmission towers according to claim 1, characterized in that: The calculation formula of gravitational potential energy Wt0 at time t0 is: Among them, E total = mgh, m is the mass of the rockfall or rolling stone, g is the acceleration of gravity, and h is the height of the center of mass of the rockfall or rolling stone before it separates from the parent rock; E t0 W is the gravitational potential energy released during the time from 0 to t0; t0 is the gravitational potential energy of the collapsed rocks or rolling stones at time t0; The calculation formula of kinetic energy Kt0 is: Among them, A t0 K is the energy consumed by the internal friction of falling rocks or rolling stones; t0 K is the kinetic energy of the rockfall or rolling stone when it hits the ground. t1 E is the kinetic energy of the impact of collapsed rocks or rolling stones on the transmission tower, t1 is the gravitational potential energy released from 0 to t1, A t1-t0 B is the energy consumed by the internal friction collapse of the transmission tower after hitting the ground and before impacting it. t0 is the energy dissipated when the falling rock or rolling stone hits the ground from 0 to t0, C t1 It is the energy dissipated by friction between falling rocks or rolling stones and the slope surface before they impact the transmission tower during the time period from 0 to t1.

5. The method for quantifying the impact energy of rockfall or rolling stones on transmission towers according to claim 1, characterized in that: The calculation formula of impact energy is: Where I0 is the impact energy of falling rocks or rolling stones, R max is the maximum impact resistance of the transmission tower, K t0 is the kinetic energy of the collapsed rock or rolling stone when it hits the ground, E total E is the total energy released during the falling, rolling and impact of rockfall or rolling stones. t0 is the gravitational potential energy released from 0 to t0, m is the mass of the falling rock or rolling stone, g is the gravitational acceleration, h is the center of mass height of the falling rock or rolling stone before separation from the parent rock, μ1 is the bottom friction factor of the rear section of the slope, μ2 and μ3 are the bottom friction factors of the middle section and the front section of the slope respectively.

6. The method for quantifying the impact energy of rockfall or rolling stones on transmission towers according to claim 1, characterized in that: The calculation formula for the energy loss caused by the movement of falling rocks or rolling rocks on the slope of the accumulation distribution area is: P = mgL (μ1 + μ2 + μ3) / 3; Among them, μ1 is the bottom friction factor of the rear slope, μ2 and μ3 are the bottom friction factors of the middle and front slopes respectively, P is the total energy lost by the falling rocks or rolling stones rolling on the slope of the entire accumulation distribution area after hitting the ground, L is the horizontal distance from the position where the falling rocks or rolling stones hit the ground of the slope of the accumulation distribution area to the tower, m is the mass of the falling rocks or rolling stones, and g is the acceleration of gravity.

7. The method for quantifying the impact energy of rockfall or rolling stones on transmission towers according to claim 1, characterized in that: The calculation formula for the impact damage coefficient is: Among them, ξ is the impact damage coefficient, c0 is the position of the load application point, EI is the equivalent lateral bending stiffness of the transmission tower, T1 is the impact force of falling rocks or rocks on the transmission tower during the impact process, and K t0 is the kinetic energy of the collapsed rock or rolling stone when it hits the ground, W t0 It is the gravitational potential energy of the collapsed rocks or rolling stones at time t0.

8. A computer program, characterized in that The computer program can implement the steps of the method according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the processor executes the steps of the method according to any one of claims 1 to 7.

10. A computer device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 11.

Images