A risk analysis method for earthquake disaster chain of urban buried gas pipeline network

Abstract

The present invention discloses a method for analyzing the earthquake disaster chain risk of an urban buried gas pipeline network, which belongs to the technical field of risk analysis. The method comprises: constructing a case library; wherein the case library comprises simulation results of earthquake disaster chains of each type of pipe segment in each type of pipe segment with different attribute information under different damage conditions; for each pipe segment in the target urban buried gas pipeline network, according to the attribute information and the constructed case library, determining the classification to which it belongs, finding the simulation results of the corresponding classification from the case library as the earthquake disaster chain analysis results; according to the distribution of each pipe segment in the target urban buried gas pipeline network and the earthquake disaster chain analysis results of each pipe segment, obtaining the earthquake disaster chain scenario of the target urban buried gas pipeline network. The present invention can realize the earthquake disaster chain risk analysis of the urban buried gas pipeline network, and can provide scientific and reasonable tools for disaster prevention planning and post-earthquake emergency response of the lifeline system.

Description

Technical Field

[0001] The present invention relates to the technical field of risk analysis, and in particular to a method for analyzing the risk of earthquake disaster chains in urban buried gas pipeline networks. Background Art

[0002] The safe operation of urban buried gas pipeline networks is an important guarantee for urban energy supply and public safety. Earthquakes may not only cause direct damage such as pipeline rupture and leakage, but also cause secondary disasters such as fire and explosion, which have a significant impact on urban operations and residents' safety. However, due to the complexity and uncertainty of earthquake disasters, traditional risk analysis methods often only consider the risks of a single link, while ignoring the chain reaction of this disaster chain, making it difficult to comprehensively and accurately assess the risks of gas pipeline networks under earthquakes.

[0003] Therefore, conducting earthquake disaster chain risk analysis of urban buried gas pipeline networks is of great significance for disaster prevention planning and post-earthquake emergency response of lifeline systems. However, there is currently a lack of relevant rapid analysis technology. Summary of the invention

[0004] The present invention provides a method for analyzing the earthquake disaster chain risk of an urban buried gas pipeline network, so as to solve the technical problem that traditional risk analysis methods often only consider the risk of a single link, while ignoring the chain reaction of the disaster chain, making it difficult to comprehensively and accurately evaluate the risk of the gas pipeline network under the action of an earthquake.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] On the one hand, the present invention provides a method for analyzing the risk of earthquake disaster chain of urban buried gas pipeline network, comprising:

[0007] Constructing a case library; wherein the case library includes simulation results of earthquake disaster chains of each type of pipe segment in different damage situations among various types of pipe segments with different attribute information;

[0008] For each pipe section in the target city's buried gas pipeline network, determine the category it belongs to based on the attribute information and the constructed case library, and find the simulation results of the corresponding category from the case library as the results of its earthquake disaster chain analysis;

[0009] According to the distribution of each pipe section in the buried gas pipeline network of the target city and the earthquake disaster chain analysis results of each pipe section, the earthquake disaster chain scenario of the buried gas pipeline network of the target city is obtained.

[0010] Furthermore, the construction of the case library includes:

[0011] Collect attribute information of underground gas pipeline networks in different cities;

[0012] Based on the attribute information, the collected pipe sections in the urban buried gas pipeline network are classified, and for each type, a unique value of each attribute information is determined, and the pipe section with this value is recorded as a typical pipe section;

[0013] Based on the attribute information, construct a model of each typical pipe segment;

[0014] Based on the models of each typical pipe section, the preset fluid mechanics simulation software is used to simulate the simulation results of the earthquake disaster chain of each typical pipe section under different damage conditions, and the simulation results are organized into a case library.

[0015] Furthermore, the attribute information of the urban buried gas pipeline network includes characteristic data of the pipeline network and the terrain and soil data where the pipeline network is located; wherein the characteristic data includes the location, length, material, diameter, burial depth, and joint type of the pipe section; the terrain and soil data includes soil type, terrain characteristics, and groundwater level.

[0016] Furthermore, the damage situation is composed of two factors: the number of leakage points and the leakage area.

[0017] Furthermore, for each pipe section in the target city's buried gas pipeline network, the category to which it belongs is determined based on the attribute information and the constructed case library, and the simulation results of the corresponding category are found from the case library as the results of its earthquake disaster chain analysis, including:

[0018] Obtain the attribute information of the buried gas pipeline network in the target city;

[0019] According to the specified earthquake scenario, determine the seismic parameters of each location of the buried gas pipeline network in the target city;

[0020] Based on the attribute information of the target city's buried gas pipeline network and the seismic parameters of each location of the target city's buried gas pipeline network, the damage conditions of each pipe section in the target city's buried gas pipeline network are calculated;

[0021] For each pipe section in the target city's buried gas pipeline network, the category to which it belongs is determined based on the attribute information and the constructed case library, and the simulation results of the corresponding category are found from the case library as the results of its earthquake disaster chain analysis.

[0022] Furthermore, the seismic parameters include peak ground motion displacement, peak ground motion velocity, peak ground motion acceleration and ground motion time history.

[0023] Furthermore, the pipelines in the target city's buried gas pipeline network are divided into integral pipelines and socket-and-spigot pipelines.

[0024] Furthermore, the number of leakage points of the integral pipeline is calculated by the following formula:

[0025]

[0026] in, Indicates the number of leaks in the pipe section; PGV indicates the peak ground velocity at the location of the pipe section; L indicates the length of the pipe section; K1 is the preset adjustment coefficient, which is 0.5 for polyethylene (PE) pipes, 0.6 for steel pipes with a diameter less than 400 mm, and 0.15 for steel pipes with a diameter not less than 400 mm;

[0027] The leakage area of ​​the integral pipe is calculated by the following formula:

[0028]

[0029] in, is the leakage area of ​​the pipeline; A is the cross-sectional area of ​​the pipe section; , L 10 is the default value.

[0030] Furthermore, the damage of the spigot-and-socket pipe includes damage to the interface and the pipe body; wherein,

[0031] The leakage area of ​​the socket-and-spigot pipe joint is calculated by the following formula:

[0032]

[0033] in, is the leakage area of ​​the interface; D is the pipe diameter; R is the displacement limit of the interface; S is the deformation of the interface; A is the cross-sectional area of ​​the pipe section;

[0034] The number of leakage points in the pipe body of the socket-and-spigot pipe is calculated by the following formula:

[0035]

[0036] in, The number of leakage points on the pipe body of the socket-and-spigot pipe; is the overall reliability of the pipe section; is the preset adjustment factor;

[0037] The leakage area of ​​the pipe body of the socket-type pipe is calculated by the following formula:

[0038]

[0039] in, is the leakage area of ​​the pipe body of the socket-and-spigot pipe, , L represents the length of the pipe segment, L 10 is the default value.

[0040] Furthermore, the analysis results include leakage rate, leakage volume, diffusion range and explosion impact range.

[0041] On the other hand, the present invention further provides an electronic device, comprising a processor and a memory; wherein the memory stores at least one instruction, and the instruction is loaded and executed by the processor to implement the above method.

[0042] In yet another aspect, the present invention further provides a computer-readable storage medium, wherein at least one instruction is stored in the storage medium, and the instruction is loaded and executed by a processor to implement the above method.

[0043] The beneficial effects brought about by the technical solution provided by the present invention include at least:

[0044] The urban buried gas pipeline network earthquake disaster chain risk analysis method provided by the present invention can realize the urban buried gas pipeline network earthquake disaster chain risk analysis under specified earthquake scenarios by utilizing the basic attribute data and information of the urban buried gas pipeline network, so as to comprehensively and accurately assess the gas pipeline network risk under earthquake action, thereby providing a scientific and reasonable tool for disaster prevention planning and post-earthquake emergency response of the lifeline system, and has great application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 It is a schematic diagram of the execution flow of the urban buried gas pipeline network earthquake disaster chain risk analysis method provided by an embodiment of the present invention;

[0047] Figure 2 It is a system block diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0049] First of all, it should be noted that in the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplarily" is intended to present the concept in a concrete way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0050] First embodiment

[0051] This embodiment provides a method for analyzing the risk of earthquake disaster chain in an urban buried gas pipeline network. The method can be implemented by an electronic device. The execution process of the method is as follows: Figure 1 As shown, the following steps are included:

[0052] S1, constructing a case library; wherein the case library includes simulation results of earthquake disaster chains of each type of pipe segment in different types of pipe segments with different attribute information under different damage conditions;

[0053] The method of constructing the case library in this embodiment is as follows: basic attribute data and information of typical urban buried gas pipeline networks are collected, and the "leakage-diffusion-explosion" disaster chain process of gas is simulated for key pipe sections with different leakage areas, pipe diameters, pressures and buried depths to form a case library. The specific process is as follows:

[0054] S11, collect basic attribute data and information of typical urban buried gas pipeline networks;

[0055] Specifically, this embodiment collects basic attribute data and information of typical urban buried gas pipeline networks through field surveys, literature reviews, etc. These data and information include characteristic data of the pipeline network, such as pipe segment location, length, material, diameter, burial depth, joint type, etc., as well as terrain and soil data where the pipeline network is located, such as soil type, terrain characteristics, groundwater level, etc., thereby providing a data basis for subsequent simulation analysis.

[0056] S12, classifying the urban pipe sections based on the attribute information, determining a unique value of each attribute information for each type, and recording the pipe section with this value as a typical pipe section;

[0057] Specifically, this embodiment analyzes the data of typical urban buried gas pipeline networks collected in S11, divides the value range of each attribute, and then combines the values ​​of different attributes, each combination being a classification. For each classification, a unique value of each attribute is determined (such as the median value of the value range of this attribute), and the pipe section under this value is recorded as a typical pipe section.

[0058] S13, constructing a model of each typical pipe segment based on the attribute information;

[0059] Specifically, this embodiment constructs a detailed buried gas pipeline network model based on basic attribute data and information of the pipeline network, which includes constructing a geometric model of the pipeline, defining the material and physical properties of the pipeline, and so on.

[0060] S14, based on the model of each typical pipe section, using the preset fluid mechanics simulation software, simulate the simulation results of the earthquake disaster chain of each typical pipe section under different damage conditions, and organize the simulation results into a case library;

[0061] Specifically, this embodiment uses fluid mechanics simulation software such as ANSYS Fluent to simulate the process in which a gas pipe section is damaged by an earthquake and leaks, and spreads to the soil, atmosphere, and may explode under different conditions, such as different leakage areas, different pipe diameters, different pressures, and burial depths. The results of the simulation analysis are organized into a case library; wherein the case library should comprehensively and deeply include a variety of possible disaster development paths, so it is necessary to ensure that the values ​​of key parameters such as leakage area, pipe section burial depth, pipeline material, soil conditions, etc. can widely cover the possible damage situations under various earthquake scenarios. The analysis results include data such as leakage rate, leakage volume, diffusion range, explosion impact range, etc., to provide information for the subsequent earthquake disaster chain scenario construction.

[0062] S2, for each pipe section in the target city's buried gas pipeline network, determine the category it belongs to based on the attribute information and the constructed case library, and find the simulation results of the corresponding category from the case library as the analysis results of its earthquake disaster chain;

[0063] The method for obtaining the earthquake disaster chain analysis results of each pipe section in the target pipe network in this embodiment is as follows:

[0064] S21, obtaining attribute information of the target city's buried gas pipeline network.

[0065] S22, determining earthquake motion parameters at various locations of the buried gas pipeline network in the target city according to the specified earthquake scenario;

[0066] Specifically, the seismic parameters of various locations in the urban buried gas pipeline network include peak ground motion displacement, peak ground motion velocity, peak ground motion acceleration, ground motion time course, etc.

[0067] S23, calculating the damage of each pipe section in the target city's buried gas pipeline network based on the attribute information of the target city's buried gas pipeline network and the seismic parameters of each location of the target city's buried gas pipeline network;

[0068] The damage conditions include the number of damages and leakage areas of each pipe section; specifically, the number of damages and leakage areas of each pipe section are divided into two types of pipelines: integral pipelines and socket-type pipelines.

[0069] The number of leak points in an integral pipeline can be calculated using the following formula:

[0070] (1)

[0071] in, Indicates the number of leakage points in the pipe section; PGV indicates the peak ground motion velocity at the location of the pipe section; L indicates the length of the pipe section; K1 is the preset adjustment coefficient, which is 0.5 for polyethylene (PE) pipes, 0.6 for steel pipes with a diameter less than 400 mm, and 0.15 for steel pipes with a diameter not less than 400 mm;

[0072] The leakage area of ​​the integral pipeline is calculated as follows:

[0073] According to the length of the pipe section and the number of leakage points, the average number of leakage points per 10km is calculated:

[0074] (2)

[0075] Among them, L 10 is a preset value, in this embodiment, its value is 10km;

[0076] Using the calculated average number of leakage points per 10km, the leakage area is determined by the following formula:

[0077] (3)

[0078] in, is the leakage area of ​​the pipeline; A is the cross-sectional area of ​​the pipe section;

[0079] Furthermore, the types of damage to the spigot-and-socket pipe include interface damage and pipe body damage; among them,

[0080] The leakage area of ​​the socket-type pipe interface can be calculated by the following formula:

[0081] (4)

[0082] in, is the leakage area of ​​the interface; D is the pipe diameter; R is the displacement limit of the interface, which can be determined according to the pipe material and the interface method; S is the interface deformation, which can be determined according to the earthquake parameters; the number of leakage points of the pipe body of the socket-type pipe is calculated by the following formula:

[0083] (5)

[0084] in, The number of leakage points on the pipe body of the socket-and-spigot pipe; The overall reliability of the pipe section can be determined by the interface deformation and interface displacement limit; It is the preset adjustment coefficient, which can be 10%~20%;

[0085] The leakage area of ​​the pipe body of the socket-and-spigot pipe is obtained by formula (3). .

[0086] S24, for each pipe section in the buried gas pipeline network of the target city, determine the category to which it belongs according to the attribute information and the constructed case library, and find the simulation result of the corresponding category from the case library, that is, the simulation result of the typical pipe section corresponding to the corresponding category under the damage condition calculated in S23, as its earthquake disaster chain analysis result; wherein, when determining the category to which the target pipe section belongs, the category to which the target pipe section belongs is determined according to the attribute information value of the target pipe section and the value range of the attribute information divided by S12, and according to the value range into which the attribute information value of the target pipe section falls;

[0087] S3, according to the distribution of each pipe section in the target city's buried gas pipeline network and the earthquake disaster chain analysis results of each pipe section, the earthquake disaster chain scenario of the target city's buried gas pipeline network is obtained;

[0088] Specifically, the implementation process of S3 is as follows: the damage of each pipe section is marked on the map with different colors, including direct disasters such as pipeline rupture and leakage and secondary disasters such as fire, explosion, and poisoning. The above direct disasters and secondary disasters are interrelated to form an earthquake disaster chain. The location and impact range of the disaster are further marked, including the direct damage area and the area that may be affected by the secondary disaster.

[0089] In summary, this embodiment provides a method for analyzing the earthquake disaster chain risk of urban buried gas pipeline networks. Under specified earthquake scenarios, the basic attribute data and information of urban buried gas pipeline networks can be used to realize the earthquake disaster chain risk analysis of urban buried gas pipeline networks, so as to comprehensively and accurately assess the risks of gas pipeline networks under earthquakes, thereby providing scientific and reasonable tools for disaster prevention planning and post-earthquake emergency response of lifeline systems.

[0090] Second embodiment

[0091] This embodiment provides an electronic device, such as Figure 2 As shown, the electronic device includes: a processor and a memory; wherein the processor and the memory can be connected via a communication bus; the memory stores at least one instruction, and the instruction is loaded and executed by the processor to implement the method of the first embodiment. In addition, the electronic device may also include a transceiver, the processor and the transceiver can be connected via a communication bus, and the transceiver is used to communicate with other devices.

[0092] Next, combine Figure 2 The following is a detailed introduction to the various components of the electronic device:

[0093] Among them, the processor is the control center of the electronic device, and the electronic device may include multiple processors, each of which may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The processor here may be a processor or a general term for multiple processing elements. For example, the processor is one or more central processing units (CPUs), or other general-purpose processors, application specific integrated circuits (ASICs), or one or more integrated circuits configured to implement an embodiment of the present invention, such as one or more microprocessors (digital signal processors, DSPs), or one or more field programmable gate arrays (field programmable gate arrays, FPGAs), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor may execute various functions of the electronic device by running or executing software programs stored in the memory and calling data stored in the memory.

[0094] In a specific implementation, as an embodiment, the processor may include one or more CPUs, such as Figure 2 The CPU0 and CPU1 shown in the figure are, of course, only exemplary.

[0095] The memory is used to store the software program for executing the solution of the present invention, and the execution is controlled by the processor. The specific implementation method can refer to the above method embodiment and will not be repeated here.

[0096] Optionally, the memory may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may be integrated with the processor or exist independently and accessed through the interface circuit ( Figure 2 The processor is coupled to the processor (not shown), which is not specifically limited in this embodiment of the present invention.

[0097] The transceiver may include a receiver and a transmitter ( Figure 2 The receiver is used to implement the receiving function, and the transmitter is used to implement the sending function. The transceiver can be integrated with the processor or exist independently and communicate with the electronic device through the interface circuit ( Figure 2 (not shown) is coupled to the processor, which is not specifically limited in this embodiment of the present invention.

[0098] In addition, it should be noted that Figure 2 The structure of the electronic device shown in the figure does not constitute a limitation on the device, and the actual device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently. In addition, the technical effects achieved by the electronic device when executing the method of the first embodiment above can refer to the technical effects described in the first embodiment above, so they are not repeated here.

[0099] Third embodiment

[0100] This embodiment provides a computer-readable storage medium, which stores at least one instruction, and the instruction is loaded and executed by a processor to implement the method of the first embodiment. The computer-readable storage medium may be a ROM, a random access memory, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc. The instructions stored therein may be loaded by a processor in a terminal to execute the method.

[0101] In addition, it should be noted that the present invention can be provided as a method, an apparatus or a computer program product. Therefore, the embodiment of the present invention can be in the form of a full or partial hardware embodiment, a full or partial software embodiment or an embodiment combining software and hardware. Moreover, when implemented using software, the embodiment of the present invention can be in the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program codes. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center containing one or more available media sets. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium. The semiconductor medium may be a solid state hard disk.

[0102] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks 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, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal 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.

[0103] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, so that a series of operation steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable terminal device provide for implementing the process in 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.

[0104] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements. In addition, the term "and / or" is only an association relationship describing the associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone, wherein A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding. "At least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or plural.

[0105] In addition, it can be understood that in various embodiments of the present invention, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0106] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0107] In several embodiments provided by the present invention, it should be understood that the disclosed equipment, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of functional modules / units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0108] If the method is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0109] Finally, it should be noted that the above is only a preferred embodiment of the present invention. It should be pointed out that although the preferred embodiment of the present invention has been described, for ordinary technicians in this technical field, once the basic creative concept of the present invention is known, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. Therefore, the attached claims are intended to be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the embodiments of the present invention.

Claims

1. A method for analyzing the earthquake disaster chain risk of an urban buried gas pipeline network, characterized in that: include: Constructing a case library; wherein the case library includes simulation results of earthquake disaster chains of each type of pipe segment in different damage situations among various types of pipe segments with different attribute information; For each pipe section in the target city's buried gas pipeline network, determine the category it belongs to based on the attribute information and the constructed case library, and find the simulation results of the corresponding category from the case library as the results of its earthquake disaster chain analysis; According to the distribution of each pipe section in the target city's buried gas pipeline network and the earthquake disaster chain analysis results of each pipe section, the earthquake disaster chain scenario of the target city's buried gas pipeline network is obtained; For each pipe section in the target city's buried gas pipeline network, the category to which it belongs is determined based on the attribute information and the constructed case library, and the simulation results of the corresponding category are found from the case library as the results of its earthquake disaster chain analysis, including: Obtain the attribute information of the buried gas pipeline network in the target city; According to the specified earthquake scenario, determine the seismic parameters of each location of the buried gas pipeline network in the target city; Based on the attribute information of the target city's buried gas pipeline network and the seismic parameters of each location of the target city's buried gas pipeline network, the damage conditions of each pipe section in the target city's buried gas pipeline network are calculated; For each pipe section in the target city's buried gas pipeline network, determine the category it belongs to based on the attribute information and the constructed case library, and find the simulation results of the corresponding category from the case library as the results of its earthquake disaster chain analysis; The seismic parameters include peak ground motion displacement, peak ground motion velocity, peak ground motion acceleration and ground motion time history; The pipelines in the underground gas pipeline network of the target city are divided into integral pipelines and socket-type pipelines; The number of leakage points of the integral pipeline is calculated by the following formula: N a =0.2415K1·L·PGV Among them, N a Indicates the number of leaks in the pipe section; PGV indicates the peak ground velocity at the location of the pipe section; L indicates the length of the pipe section; K1 is the preset adjustment coefficient; The leakage area of ​​the integral pipe is calculated by the following formula: Among them, A L1 is the leakage area of ​​the pipeline; A is the cross-sectional area of ​​the pipe section; N 10 =N a ·L 10 / L,L 10 is the default value.

2. The method for analyzing earthquake disaster chain risk of urban buried gas pipeline network according to claim 1, characterized in that: The construction of the case library includes: Collect attribute information of underground gas pipeline networks in different cities; Based on the attribute information, the collected pipe sections in the urban buried gas pipeline network are classified, and for each type, a unique value of each corresponding attribute information is determined, and the pipe section with this value is recorded as a typical pipe section; Based on the attribute information, construct a model of each typical pipe segment; Based on the models of each typical pipe section, the preset fluid mechanics simulation software is used to simulate the simulation results of the earthquake disaster chain of each typical pipe section under different damage conditions, and the simulation results are organized into a case library.

3. The method for analyzing earthquake disaster chain risk of urban buried gas pipeline network according to claim 2, characterized in that: The attribute information of the urban underground gas pipeline network includes characteristic data of the pipeline network and terrain and soil data where the pipeline network is located; wherein the characteristic data includes the location, length, material, diameter, burial depth, and joint type of the pipe section; and the terrain and soil data includes soil type, terrain characteristics, and groundwater level.

4. The method for analyzing earthquake disaster chain risk of urban buried gas pipeline network according to claim 3, characterized in that: The damage situation is composed of two factors: the number of leakage points and the leakage area.

5. The method for analyzing earthquake disaster chain risk of urban buried gas pipeline network according to claim 1, characterized in that: The damage of the spigot-and-socket pipe includes damage to the interface and the pipe body; wherein, The leakage area of ​​the socket-and-spigot pipe joint is calculated by the following formula: Among them, A L2 is the leakage area of ​​the interface; D is the pipe diameter; R is the displacement limit of the interface; S is the deformation of the interface; A is the cross-sectional area of ​​the pipe section; The number of leakage points in the pipe body of the socket-and-spigot pipe is calculated by the following formula: A b =-K2·lnR ep Among them, N b is the number of leakage points on the pipe body of the socket-and-spigot pipe; R ep is the overall reliability of the pipe section; K2 is the preset adjustment coefficient; The leakage area of ​​the pipe body of the socket-type pipe is calculated by the following formula: Among them, A L3 is the leakage area of ​​the pipe body of the socket-and-spigot pipe, N 10 =N b ·L 10 / L, L represents the length of the pipe section, L 10 is the default value.

6. The method for analyzing earthquake disaster chain risk of urban buried gas pipeline network according to claim 1, characterized in that: The analysis results include leakage rate, leakage volume, diffusion range and explosion impact range.

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