Short-time heavy rainfall power transmission line slope stability evaluation method

Abstract

The invention relates to a short-time heavy rainfall power transmission line slope stability evaluation method. The method comprises the following steps: arranging an optical fiber temperature sensor system on a power transmission line slope; when short-time heavy rainfall permeates into the power transmission line slope, the optical fiber temperature sensor system collects temperature data through a temperature sensor; calculating the slope water inflow and the rainwater infiltration speed based on the collected temperature data; evaluating the slope stability of the power transmission line according to the slope water inflow and the rainwater infiltration speed; according to the method, dynamic data analysis of a temperature field and a moisture field is combined, a correlation model of rainwater infiltration and slope stability is established, and a stable, economical and efficient slope dynamic monitoring and early warning means is provided.

Description

Technical Field

[0001] The invention relates to a method for evaluating the slope stability of a power transmission line under short-term heavy rainfall, and belongs to the technical field of slope stability early warning. Background Art

[0002] In the operation and maintenance of transmission lines, slope stability is one of the key factors to ensure the safe operation of the transmission system. However, since most transmission lines pass through mountainous areas, the slope structure is usually significantly affected by geological and meteorological conditions, especially in the case of short-term heavy rainfall, the problem of slope instability is more prominent. This instability phenomenon may lead to secondary disasters such as landslides and mud-rock flows, posing a serious threat to the normal operation of transmission lines and the safety of the surrounding environment.

[0003] Short-term heavy rainfall is one of the main causes of slope instability. The rapid infiltration of heavy rainfall not only significantly increases the water content and pore water pressure of the slope soil, but also weakens the shear strength of the soil, thereby accelerating the occurrence of sliding. At the same time, since the infiltration process of rainwater is usually accompanied by dynamic changes in the temperature field, the interaction between temperature gradient and water flow further complicates the assessment of slope stability. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention proposes a method for evaluating the slope stability of a power transmission line under short-term heavy rainfall.

[0005] The technical solution of the present invention is as follows:

[0006] On the one hand, the present invention provides a method for evaluating the slope stability of a power transmission line under short-term heavy rainfall, comprising the following steps:

[0007] Deploy fiber optic temperature sensor systems on the slopes of transmission lines;

[0008] When short-term heavy rainfall infiltrates the slope of the transmission line, the optical fiber temperature sensor system collects temperature data through the temperature sensor;

[0009] Calculate the amount of water entering the slope and the rate of rainwater infiltration based on the collected temperature data;

[0010] The slope stability of the transmission line is evaluated based on the amount of water entering the slope and the speed of rainwater infiltration.

[0011] As a preferred embodiment of the present invention, the optical fiber temperature sensor system includes a plurality of temperature sensors, a plurality of heating devices, a plurality of soil moisture monitoring devices and a solar power supply device, wherein the solar power supply device is used to power the optical fiber temperature sensor system, and the temperature sensors, heating devices and soil moisture monitoring devices are arranged on the slope of the transmission line at preset intervals.

[0012] As a preferred embodiment of the present invention, the optical fiber temperature sensor system receives meteorological data from a real-time meteorological station. When the meteorological data predicts rain, the optical fiber temperature sensor system starts a heating device to preheat the slope soil.

[0013] As a preferred embodiment of the present invention, the calculation formula of the slope water inflow W is:

[0014]

[0015] Where: t0 represents the start time of heavy rainfall; A represents the slope area; represents the divergence operator; K represents the permeability coefficient function; θ represents the soil moisture content; φ represents the permeability potential coefficient; t represents the current time; T represents the soil temperature; z represents the gravity potential; β represents the water-heat interaction correction factor.

[0016] As a preferred embodiment of the present invention, the calculation formula of the rainwater infiltration speed v is:

[0017]

[0018] Where: K s represents the saturated permeability coefficient; n represents the nonlinear permeability correction coefficient of soil moisture content; ΔT represents the temperature change; T r represents reference temperature; h represents pressure head; z2 represents the depth of soil moisture monitoring device; z1 represents the depth of temperature sensor.

[0019] As a preferred embodiment of the present invention, a plurality of stability assessment levels are set, each stability assessment level is provided with an infiltration velocity threshold and a water inflow threshold, the stability assessment level of the current transmission line slope is judged according to the calculated slope water inflow and rainwater infiltration velocity, and different levels of protection measures are taken for the transmission line slope according to the stability assessment level.

[0020] On the other hand, the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in any embodiment of the present invention is implemented.

[0021] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in any embodiment of the present invention.

[0022] The present invention has the following beneficial effects:

[0023] 1. The present invention combines the dynamic data analysis of temperature field and moisture field to establish a correlation model between rainwater infiltration and slope stability, providing a stable, economical and efficient means of dynamic slope monitoring and early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0027] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0029] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0030] Embodiment 1:

[0031] See also Figure 1 , a method for evaluating the slope stability of a power transmission line under short-term heavy rainfall, comprising the following steps:

[0032] Deploy fiber optic temperature sensor systems on the slopes of transmission lines;

[0033] When short-term heavy rainfall infiltrates the slope of the transmission line, the optical fiber temperature sensor system collects temperature data through the temperature sensor;

[0034] Calculate the amount of water entering the slope and the rate of rainwater infiltration based on the collected temperature data;

[0035] The slope stability of the transmission line is evaluated based on the amount of water entering the slope and the speed of rainwater infiltration.

[0036] As a preferred implementation mode of this embodiment, the optical fiber temperature sensor system includes a plurality of temperature sensors, a plurality of heating devices, a plurality of soil moisture monitoring devices and a solar power supply device, wherein the solar power supply device is used to power the optical fiber temperature sensor system, and the temperature sensors, heating devices and soil moisture monitoring devices are arranged on the slope of the transmission line at preset intervals.

[0037] As a preferred implementation of this embodiment, the optical fiber temperature sensor system is deployed using a trenchless threading technology.

[0038] As a preferred implementation of this embodiment, the optical fiber temperature sensor system receives meteorological data from a real-time meteorological station. When the meteorological data predicts rain, the optical fiber temperature sensor system starts a heating device to preheat the slope soil.

[0039] As a preferred implementation of this embodiment, the optical fiber temperature sensor system also includes a heating thermostat to avoid local overheating or excessive temperature fluctuations.

[0040] As a preferred implementation of this embodiment, the calculation formula for the slope water inflow W is:

[0041]

[0042] Where: t0 represents the start time of heavy rainfall; A represents the slope area; represents the divergence operator; K represents the permeability coefficient function; θ represents the soil water content; φ represents the permeability potential coefficient, φ=h+z; t represents the current time; T represents the soil temperature; z represents the gravity potential; β represents the water-heat interaction correction factor, ρ w 、c w Respectively represent the density and specific heat capacity of water; ρ s 、c s represent the density and specific heat capacity of soil respectively.

[0043] As a preferred implementation of this embodiment, the calculation formula of the rainwater infiltration speed v is:

[0044]

[0045] Where: K s represents the saturated permeability coefficient, which is related to the soil properties; n represents the nonlinear permeability correction coefficient of soil moisture content, which is generally 2 to 5; ΔT represents the temperature change; T r represents the reference temperature; h represents the pressure head, which describes the driving force of rainwater penetration; z2 represents the depth of the soil moisture monitoring device; z1 represents the depth of the temperature sensor.

[0046] As a preferred implementation of this embodiment, multiple stability assessment levels are set, each stability assessment level is provided with an infiltration velocity threshold and a water inflow threshold, the stability assessment level of the current transmission line slope is determined according to the calculated slope water inflow and rainwater infiltration velocity, and different levels of protection measures are taken for the transmission line slope according to the stability assessment level;

[0047] Specifically, in this embodiment, three levels are set. When the infiltration rate reaches the first threshold or the water inflow reaches the first threshold, a first-level warning is issued, indicating that the slope has a certain risk of instability, but the risk is relatively low;

[0048] When the infiltration rate reaches the second threshold or the water inflow reaches the second threshold, a second-level warning is issued, indicating that the risk of slope instability is high and some temporary protective measures need to be taken;

[0049] When the infiltration rate reaches the third threshold or the water inflow reaches the third threshold, a third-level warning is issued, indicating that the slope is in a highly unstable state and a landslide is likely to occur.

[0050] Embodiment 2:

[0051] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in any embodiment of the present invention when executing the program.

[0052] Embodiment three:

[0053] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method described in any embodiment of the present invention is implemented.

[0054] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0055] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, 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 this application.

[0056] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0057] In several embodiments provided in the present application, if any function 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 application, 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, which is stored in a storage medium and includes 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 application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0058] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for evaluating the slope stability of a power transmission line under short-term heavy rainfall, characterized in that: The following steps are involved: Deploy fiber optic temperature sensor systems on the slopes of transmission lines; When short-term heavy rainfall infiltrates the slope of the transmission line, the optical fiber temperature sensor system collects temperature data through the temperature sensor; Calculate the amount of water entering the slope and the rate of rainwater infiltration based on the collected temperature data; The slope stability of the transmission line is evaluated based on the amount of water entering the slope and the speed of rainwater infiltration.

2. A method for evaluating slope stability of power transmission lines under short-term heavy rainfall according to claim 1, characterized in that: The optical fiber temperature sensor system includes a plurality of temperature sensors, a plurality of heating devices, a plurality of soil moisture monitoring devices and a solar power supply device. The solar power supply device is used to power the optical fiber temperature sensor system. The temperature sensors, heating devices and soil moisture monitoring devices are arranged on the slope of the transmission line at preset intervals.

3. A method for evaluating slope stability of power transmission lines under short-term heavy rainfall according to claim 2, characterized in that: The optical fiber temperature sensor system receives meteorological data from a real-time meteorological station. When the meteorological data predicts rain, the optical fiber temperature sensor system starts a heating device to preheat the slope soil.

4. A method for evaluating slope stability of power transmission lines under short-term heavy rainfall according to claim 1, characterized in that: The calculation formula of the slope water inflow W is: Where: t0 represents the start time of heavy rainfall; A represents the slope area; represents the divergence operator; K represents the permeability coefficient function; θ represents the soil moisture content; φ represents the permeability potential coefficient; t represents the current time; T represents the soil temperature; z represents the gravity potential; β represents the water-heat interaction correction factor.

5. A method for evaluating slope stability of power transmission lines under short-term heavy rainfall according to claim 4, characterized in that: The calculation formula of the rainwater infiltration velocity v is: Where: K s represents the saturated permeability coefficient; n represents the nonlinear permeability correction coefficient of soil moisture content; ΔT represents the temperature change; T r represents reference temperature; h represents pressure head; z2 represents the depth of soil moisture monitoring device; z1 represents the depth of temperature sensor.

6. A method for evaluating slope stability of power transmission lines under short-term heavy rainfall according to claim 1, characterized in that: Set multiple stability assessment levels, each of which is equipped with an infiltration velocity threshold and a water inflow threshold. The stability assessment level of the current transmission line slope is determined based on the calculated slope water inflow and rainwater infiltration velocity, and different levels of protection measures are taken for the transmission line slope based on the stability assessment level.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 6 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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