A short-time heavy rainfall power transmission line slope stability evaluation method

Abstract

The present application relates to a kind of short time heavy rainfall transmission line slope stability evaluation method, comprising the following steps: arranging optical fiber temperature sensor system in transmission line slope;When short time heavy rainfall infiltrates transmission line slope, optical fiber temperature sensor system acquires temperature data by temperature sensor;Based on the temperature data collected, the water inflow of slope and the rainwater infiltration speed are calculated;According to the water inflow of slope and the rainwater infiltration speed, the stability of transmission line slope is evaluated;The present application combines the dynamic data analysis of temperature field and moisture field, establishes the correlation model of rainwater infiltration and slope stability, and provides a kind of stable, economic, efficient slope dynamic monitoring and early warning means.

Description

TECHNICAL FIELD

[0001] The present application relates to a short-time heavy rainfall power transmission line slope stability evaluation method, belonging to the technical field of slope stability early warning. BACKGROUND

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

[0003] Short-time 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 of temperature gradient and water flow further complicates the evaluation of slope stability. SUMMARY

[0004] In order to solve the problems existing in the prior art, the present application provides a short-time heavy rainfall power transmission line slope stability evaluation method.

[0005] The technical scheme of the present application is as follows:

[0006] On the one hand, the present application provides a short-time heavy rainfall power transmission line slope stability evaluation method, comprising the following steps:

[0007] Laying an optical fiber temperature sensor system on the slope of the power transmission line;

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

[0009] Based on the collected temperature data, the water content of the slope and the rainwater infiltration speed are calculated;

[0010] The stability of the slope of the power transmission line is evaluated according to the water content of the slope and the rainwater infiltration speed.

[0011] As a preferred embodiment of the present application, the optical fiber temperature sensor system comprises a plurality of temperature sensors, a plurality of heating devices, a plurality of soil moisture content 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 content monitoring devices are laid on the slope of the power transmission line according to a predetermined interval.

[0012] As a preferred embodiment of the present application, the optical fiber temperature sensor system receives meteorological data of a real-time weather station, and when the meteorological data forecasts rain, the optical fiber temperature sensor system starts the heating device to preheat the slope soil.

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

[0014]

[0015] Wherein, t0 represents the starting time of heavy rain; A represents the slope area; represents a divergence operator; K represents a permeability coefficient function; theta represents soil moisture content; phi represents a permeation potential coefficient; t represents the current time; T represents soil temperature; z represents gravity potential; beta represents a water-heat interaction correction factor.

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

[0017]

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

[0019] As a preferred embodiment of the present application, a plurality of stability evaluation grades are provided, each of which is provided with an infiltration speed threshold value and a water inflow threshold value, the stability evaluation grade of the current power transmission line slope is judged according to the calculated slope water inflow and the rainwater infiltration speed, and different grades of protection measures are taken for the power transmission line slope according to the stability evaluation grade.

[0020] In another aspect, the present application also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the method according to any one of the embodiments of the present application when executing the program.

[0021] In another aspect, the present application also provides a computer readable storage medium, which stores a computer program executable on a processor, and the program implements the method according to any one of the embodiments of the present application when executed on the processor.

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

[0023] 1. The present application combines the dynamic data analysis of temperature field and moisture field, establishes a correlation model of rainwater infiltration and slope stability, and provides a stable, economic and efficient slope dynamic monitoring and early warning means. Attached Figure Description

[0024] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

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

[0028] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0029] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0030] Example 1:

[0031] See Figure 1 A method for assessing the stability of transmission line slopes during short-duration heavy rainfall includes the following steps:

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

[0033] When short-term heavy rainfall seeps into the slope of transmission lines, the fiber optic temperature sensor system collects temperature data through temperature sensors.

[0034] The slope water inflow and rainwater infiltration rate are calculated based on the collected temperature data.

[0035] The stability of power transmission line slopes is assessed based on the amount of water entering the slope and the rate of rainwater infiltration.

[0036] As a preferred embodiment of the present embodiment, the optical fiber temperature sensor system comprises a plurality of temperature sensors, a plurality of heating devices, a plurality of soil moisture monitoring devices, and a solar power supply device for supplying power to the optical fiber temperature sensor system, wherein the temperature sensors, heating devices, and soil moisture monitoring devices are arranged at a predetermined interval on the slope of the power transmission line.

[0037] As a preferred embodiment of the present embodiment, the optical fiber temperature sensor system is arranged by using the trenchless crossing technology.

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

[0039] As a preferred embodiment of the present embodiment, the optical fiber temperature sensor system further comprises a heating temperature controller to avoid local overheating or excessive temperature fluctuations.

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

[0041]

[0042] Wherein: t0 represents the start time of heavy rain; A represents the area of the slope; represents the divergence operator; K represents the permeability coefficient function; θ represents the soil moisture content; φ represents the osmotic potential coefficient, φ = h + z; t represents the current time; T represents the soil temperature; z represents the gravitational 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 respectively represent the density and specific heat capacity of the soil.

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

[0044]

[0045] Wherein: K s represents the saturated permeability coefficient, which is related to the properties of the soil; n represents the nonlinear permeability correction coefficient of the soil moisture content, generally taking a value of 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 infiltration; z2 represents the depth of the soil moisture monitoring device; z1 represents the depth of the temperature sensor.

[0046] As a preferred embodiment of the present embodiment, a plurality of stability evaluation levels are provided, each of which is provided with an infiltration speed threshold value and a water inflow threshold value, and the stability evaluation level of the current power transmission line slope is determined according to the calculated water inflow and rainwater infiltration speed of the slope, and different levels of protection measures are taken for the power transmission line slope according to the stability evaluation level;

[0047] Specifically, three levels are provided in the present embodiment, when the infiltration speed reaches the first threshold value or the water inflow reaches the first threshold value, a first-level early warning is issued, indicating that the slope has a certain risk of instability at this time, but the risk is relatively low;

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

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

[0050] Embodiment two:

[0051] The present embodiment provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to realize the method of any embodiment of the present application.

[0052] Embodiment three:

[0053] The present embodiment provides a computer-readable storage medium having a computer program stored thereon, wherein the program is executed by a processor to realize the method of any embodiment of the present application.

[0054] In the embodiments of the present application, "at least one" means one or more, and "a plurality of" means two or more. The "and / or" describes the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A, B can be singular or plural. The character " / " generally represents that the associated objects before and after it are in an "or" relationship. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can mean: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0055] Those skilled in the art can clearly understand that the units and algorithm steps described in the embodiments disclosed herein can be realized by electronic hardware, computer software and a combination of the two. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0056] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0057] In several embodiments provided in the present application, any function realized in the form of a software function unit and sold or used as an independent product can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0058] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method for evaluating the stability of a power transmission line slope during short-term heavy rainfall, characterized by, The method comprises the following steps: arranging a fiber-optic temperature sensor system on a power transmission line slope; when short-time heavy rain infiltrates the power transmission line slope, the fiber-optic temperature sensor system collects temperature data through temperature sensors; calculating the water inflow and rainwater infiltration rate of the slope based on the collected temperature data; evaluating the stability of the power transmission line slope according to the water inflow and rainwater infiltration rate of the slope; The amount of water entering the slope The calculation formula is: wherein: represents the start time of heavy rainfall; represents the area of the slope; represents the divergence operator; represents the hydraulic conductivity function; represents the water content of the soil; represents the hydraulic potential coefficient; represents the current time; represents the temperature of the soil; represents the gravitational potential; represents the water-heat interaction correction factor; The rainwater infiltration speed The calculation formula is: wherein: represents a saturated permeability coefficient; represents a nonlinear permeability correction coefficient of the soil water content; represents a temperature change amount; represents a reference temperature; represents a pressure head; represents a soil water content monitoring device depth; temperature sensor depth; setting multiple stability evaluation grades, each of which is provided with an infiltration rate threshold and a water inflow threshold, judging the stability evaluation grade of the current power transmission line slope according to the calculated water inflow and rainwater infiltration rate of the slope, and taking different levels of protective measures for the power transmission line slope according to the stability evaluation grade.

2. The method for evaluating the stability of a power transmission line slope during short-term heavy rainfall according to claim 1, characterized in that, The fiber-optic temperature sensor system comprises 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 supply power to the fiber-optic temperature sensor system, and the temperature sensors, heating devices, and soil moisture monitoring devices are arranged on the power transmission line slope at a preset interval.

3. The method for short-time heavy rainfall induced slope stability assessment of power transmission line according to claim 2, characterized in that, The fiber-optic temperature sensor system receives meteorological data from a real-time weather station, and when the meteorological data forecasts rain, the fiber-optic temperature sensor system starts the heating device to preheat the slope soil.

4. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the method of any one of claims 1-3.

5. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method of any one of claims 1-3.

Images