A regional power transmission line landslide automatic monitoring method

Abstract

The application discloses a regional power transmission line landslide automatic monitoring method, first, superimposing regional topography, geology, tower and InSAR data into a comprehensive plan; then, automatically identifying the slope top and slope foot information of each power transmission tower through a computer program, after the above information is approved by a geology professional in a room, automatically identifying a to-be-confirmed monitoring area; then, automatically determining the potential damage mode of each slope body, and automatically correcting the final monitoring area; finally, periodically monitoring the final monitoring area through InSAR periodic deformation displacement data, so as to realize regional power transmission line landslide automatic monitoring. The application provides a method which only needs to review and correct the slope top and slope foot information of each power transmission tower by a geology professional in a room, and can automatically realize more professional, more accurate and more targeted reduction of the monitoring area through a computer, and realize high-frequency and high-accuracy indoor regional power transmission line landslide automatic monitoring.

Description

Technical Field

[0001] This invention relates to an automatic monitoring method for landslides on regional transmission lines, belonging to the technical field of transmission line monitoring methods. Background Technology

[0002] Landslides are the most common type of geological hazard to power transmission lines. They are widely distributed and pose a significant threat, especially in mountainous areas where more than two-thirds of the geological disasters affecting power transmission lines are landslides. Therefore, landslide monitoring of power transmission lines has always been a hot topic and a major challenge.

[0003] Because most power transmission lines are located far from densely populated areas, are widely dispersed, and are difficult to access, power transmission line landslides have the following characteristics compared to landslides in other industries: ① Geological hazard investigations conducted by land and resources departments mainly target areas near densely populated areas. Related work carried out by other industries rarely involves the vicinity of power transmission towers. In fact, most villagers near power transmission towers do not usually pass by or pay attention to any abnormalities in the vicinity of power transmission towers. Therefore, the monitoring of power transmission line landslides mainly relies on the low-frequency patrols of a small number of patrol personnel from the power grid company; ② In the existing technology, the monitoring of landslides on power transmission lines only focuses on landslides that affect power transmission towers. Even if the landslide is very close to the power transmission tower, it does not need to be paid attention to as long as it does not affect the stability of the power transmission tower. However, most of the patrol personnel of the power grid company are from electrical engineering-related majors, and a small number of them have or do not have geological knowledge. It is difficult to meet the geological knowledge requirements for monitoring power transmission line landslides with only a small amount of training.

[0004] Traditional methods for monitoring landslides along power transmission lines are as follows: First, villagers near the transmission towers are hired to monitor the towers and surrounding areas at least once a month. In addition, except in special circumstances, power grid company inspectors conduct routine inspections every 3-6 months. If any abnormalities are found, such as slope cutting at the toe or cracks near the transmission towers, relevant geological professionals are immediately notified to conduct on-site verification.

[0005] Traditional methods for monitoring landslides on power transmission lines have the following problems:

[0006] 1. Neither villagers nor inspection personnel are geological professionals; they can only rely on conventional experience for judgment. Besides subjective errors, they often fail to accurately focus on the areas requiring monitoring, leading to missed or false reports. For example, even if large-scale excavation occurs at the toe of a tangential slope, the potential sliding mode is shallow soil collapse, and the surface soil of the slope is often thin, so the impact is limited, and the power transmission towers on it are usually unaffected. However, most dip slopes are at risk of large-scale landslides along the slope surface; even if the power transmission towers are far from the toe of the slope, they are often affected by the excavation at the toe.

[0007] 2. Although villagers can notify geological professionals for a quick response after discovering abnormalities, many landslides, if left untreated, often develop and deteriorate within a shorter period than the time it takes for geological professionals to arrive on site, thus missing the best opportunity for landslide control.

[0008] 3. Due to the characteristics of power transmission lines being far from densely populated areas, widely dispersed in a point-like manner, and inconvenient transportation, each power transmission tower is often located on different mountains, separated by mountain roads for several kilometers, and often can only be accessed on foot. Therefore, not only is the workload and cost of on-site regional inspections enormous, but it is also impossible to achieve large-scale regional on-site surveys by geological professionals.

[0009] Although some geological professionals have attempted to develop automated indoor regional monitoring methods for landslides along power transmission lines, these methods often encounter challenges related to workload, cost, efficiency, and accuracy due to the large monitoring areas, hindering widespread adoption. If all landslide monitoring areas were to be manually delineated by geological professionals indoors or on-site, the workload would be too immense. Therefore, current technologies often use the foundation stability of a single tower to represent the entire mountainside, or even use the foundation stability of a single tower as the center to define the entire monitoring area.

[0010] Existing methods for monitoring landslides along power transmission lines result in a significant waste of time and economic resources, and their accuracy needs further improvement.

[0011] In summary, there is an urgent need for an automated indoor monitoring method for regional power transmission line landslides that requires only a small number of geological professionals to participate in, and that can more professionally, accurately, and specifically narrow the monitoring area to achieve high frequency and high accuracy. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide an automatic monitoring method for landslides on regional transmission lines, so as to solve the technical problems existing in the prior art.

[0013] The technical solution adopted in this invention is: an automatic monitoring method for landslides along regional transmission lines, comprising the following steps:

[0014] Step 1: Collect medium-scale regional topographic maps, medium-scale regional geological maps, spatial coordinate information of each tower of the transmission line, and InSAR periodic data of the target area. After converting the data into a unified coordinate system, the topographic elevation, tower coordinate information, regional stratigraphic attitude information, and InSAR surface deformation and displacement data are overlaid to form a comprehensive plan view.

[0015] Step 2: Using a computer program, on the integrated plan, first take each transmission tower as the center, and gradually increase the search radius to search for the top of the slope where each transmission tower is located;

[0016] Step 3: Using a computer program, draw rays from the top of each slope towards the transmission tower. Using these rays as the center line, draw rays every 4 to 6 degrees around the top of the slope, deflecting 60 to 70 degrees to both sides. This will obtain the foot of the slope for each ray.

[0017] Step 4: Taking each transmission line tower as a unit, after geological professionals review and correct the slope top and slope toe information determined by the above method indoors, connect the slope toe points of the slope where the transmission line tower is located, and the resulting slope toe line is used as the lower boundary. Two rays that deflect 60-70° to the left and right of the ray from the slope top toward the transmission line tower are used as the left and right boundaries. The 135-140° "fan-shaped" area with the slope top as the vertex is the monitoring area to be confirmed.

[0018] Step 5: With the top of the slope as the center, draw a ray towards the transmission tower. Take the slope foot on the previously obtained ray as the other endpoint. The resulting line segment is the horizontal projection line of the typical cross-section of the transmission tower slope on the comprehensive plan. Based on this line segment and the intersecting elevation lines, the ground slope line of the typical cross-section can be drawn.

[0019] Step 6: Perform a straight line fitting on the ground slope line from the toe of the slope to the transmission tower. The minimum angle between the fitted straight line and the horizontal line is the slope angle of the slope. Furthermore, on the comprehensive plan, taking the slope crest as the center and starting from due north, the angle of clockwise rotation to the horizontal projection line of the typical section is the slope inclination τ. 坡 The dip angle of the rock strata in this slope area was obtained by reading the regional geological map. and rock strata dip τ 岩 ;

[0020] Step 7: Based on the slope conversion formula, adjust the slope dip direction τ. 坡 and rock strata dip τ 岩 This is transformed into the slope orientation and the orientation of the rock strata.

[0021] If |slope strike - rock strata strike| ≤ 70° and the slope angle This indicates that there is a risk of large-scale sliding along the slope. The monitoring area needs to start from the toe of the slope. At this point, the monitoring area to be confirmed is the final monitoring area of ​​the transmission tower slope.

[0022] If |slope strike - rock strata strike| > 70° or slope angle The potential sliding mode is the collapse of the surface soil of the slope, so the lower boundary of the monitoring area can be shortened. The method for determining the lower boundary of the monitoring area is as follows: draw a 20m vertical line segment downwards at the transmission tower on the typical cross-section ground slope line. Taking the lower end of this line segment as the starting point, draw a ray horizontally downwards towards the slope toe at an angle of rupture θ. The intersection of the ray and the ground slope line is the lower boundary point of the final monitoring area on the typical cross-section. Measure the horizontal distance l between this lower boundary point and the transmission tower. Then, on the comprehensive plan, draw a circle with the transmission tower as the center and l as the radius. The area enclosed by the intersection of the circle and the left and right boundaries of the monitoring area to be confirmed is the final monitoring area of ​​the transmission tower slope.

[0023] Step 8: For the final monitoring area corresponding to each transmission line tower, periodic monitoring is carried out using InSAR periodic surface deformation and displacement data. When the displacement rate in the final monitoring area exceeds the warning threshold, an alarm is triggered, and subsequent on-site verification and remediation are carried out.

[0024] Preferably, in the second step, the criterion for determining the top of the slope is: the elevation information of the intersection of a certain radius line on the search circle is first satisfied that the elevation above the transmission tower shows a trend of first increasing and then decreasing, and the point with the highest elevation on this radius line is the top of the slope where each transmission tower is located.

[0025] Preferably, the elevation decrease trend should continue for more than 10m.

[0026] Preferably, in the third step, a computer program is used to draw rays from the top of each slope to the direction of the power transmission tower on the comprehensive plan. Elevation information is searched outward along the rays. When the first 30m horizontal distance drop difference is ≤5m, or when the trend of first dropping and then rising is first shown, the endpoint of the 30m segment near the top of the slope in the former, or the starting point of the rising segment in the latter, is the foot of the slope on that ray.

[0027] Preferably, the elevation rise trend should last for more than 10m.

[0028] Preferably, in the seventh step,

[0029] Preferably, in the seventh step,

[0030] Preferably, in the seventh step, if the horizontal distance l between the lower boundary point and the transmission tower is greater than or equal to the horizontal distance between the slope toe and the transmission tower, the monitoring area to be confirmed should be taken as the final monitoring area.

[0031] The beneficial effects of the present invention are as follows: Compared with the prior art, the present invention provides a method for more professional, accurate and targeted indoor regional landslide monitoring of power transmission lines, which only requires geological professionals to verify and correct the information of the top and bottom of the slope where each power transmission tower is located. Attached Figure Description

[0032] Figure 1 Yes | Slope strike - rock strata strike > 70° or slope angle A schematic diagram illustrating the method for determining the lower boundary of the monitoring area at that time. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1:

[0035] Step 1: Collect medium-scale regional topographic maps, medium-scale regional geological maps, spatial coordinate information of each tower of the transmission line, and InSAR periodic data of the target area. After converting the data into a unified coordinate system, the topographic elevation, tower coordinate information, regional stratigraphic attitude information, and InSAR surface deformation and displacement data are overlaid to form a comprehensive plan view.

[0036] Step 2: Using a computer program, on the integrated plan, first use each transmission tower as the center, and gradually increase the search radius to search for the top of the slope where each transmission tower is located. The criterion for determining the top of the slope is that when a certain radius line on the search circle intersects the elevation information, and the elevation above the transmission tower first shows a trend of increasing and then decreasing (the decreasing elevation trend must last for 10m), the point with the highest elevation on this radius line is the top of the slope where each transmission tower is located.

[0037] Step 3: Using a computer program, draw rays from the top of each slope towards the transmission tower on the integrated plan. Search for elevation information outward along the rays. When the first 30m horizontal distance drop difference is ≤5m, or when the first trend of first dropping and then rising (the elevation rise trend must last for 10m), the endpoint of the 30m segment near the top of the slope in the former case, or the starting point of the rising segment in the latter case, is the foot of the slope on that ray. Using a computer program, draw rays from the top of each slope towards the transmission tower. Using this ray as the center line, draw rays every 5° around the top of the slope, deflecting 70° to both sides. Use the method in the previous step to obtain the foot of the slope for each ray.

[0038] Step 4: Taking each transmission line tower as a unit, after geological professionals review and correct the slope top and slope toe information determined by the above method indoors, connect the slope toe points of the slope where the transmission line tower is located, and the resulting slope toe line is used as the lower boundary. Two rays that deflect 70° to the left and right of the ray from the slope top toward the transmission line tower are used as the left and right boundaries. The 140° "fan-shaped" area with the slope top as the vertex is the monitoring area to be confirmed.

[0039] Step 5: Using the top of the slope as the center, draw a ray towards the transmission tower. Using the slope toe of this ray as the other endpoint, the resulting line segment is the horizontal projection line of the typical cross-section of the transmission tower slope on the integrated plan. Based on this line segment and the intersecting elevation lines, the ground slope line of the typical cross-section can be drawn. Perform a straight line fitting on the ground slope line from the slope toe to the transmission tower. The minimum angle between the fitted straight line and the horizontal line is the slope angle of the slope. Furthermore, on the comprehensive plan, taking the slope crest as the center and starting from due north, the angle of clockwise rotation to the horizontal projection line of the typical section is the slope inclination τ. 坡 In addition, the dip angle of the rock strata in this slope area can also be obtained by reading the regional geological map. and tendency τ 岩 ;

[0040] Step 6: Based on the slope conversion formula, adjust the slope dip direction τ. 坡 and rock strata dip τ 岩 Transform into slope orientation and rock strata orientation. If |slope orientation - rock strata orientation| ≤ 70°, and the slope angle... This indicates a risk of large-scale landslide along the slope. The monitoring area must begin at the toe of the slope; the area to be monitored at this point is the final monitoring area for the transmission tower slope. Wherein:

[0041]

[0042] Step 7: If |slope strike - rock strata strike| > 70°, or slope angle The potential sliding mode is the collapse of the surface soil of the slope, and the thickness of the surface soil is mostly 1-5m, with a maximum depth of no more than 20m. Therefore, the lower boundary of the monitoring area can be shortened. The method for determining the lower boundary of the monitoring area in this case is as follows: Figure 1 As shown, a 20m vertical line segment is drawn downwards at the transmission tower along a typical cross-section ground slope. Starting from the lower end of this line segment, a horizontal downward line is drawn towards the slope toe with a breaking angle θ. Draw a ray at an angle of 0°. The intersection of the ray and the slope line on the ground is the lower boundary point of the final monitoring area on the typical cross-section. Measure the horizontal distance *l* between this lower boundary point and the transmission tower. Then, on the integrated plan, draw a circle with the transmission tower as the center and *l* as the radius. The area enclosed by the intersection of this circle and the left and right boundaries of the monitoring area to be confirmed is |slope strike - rock stratum strike| > 70°, or the slope angle. The final monitoring area at that time; however, if the horizontal distance l between the lower boundary point and the transmission tower is greater than or equal to the horizontal distance between the slope toe and the transmission tower, the monitoring area to be confirmed shall be taken as the final monitoring area;

[0043] Step 8: For the final monitoring area corresponding to each transmission line tower, periodic monitoring is carried out using InSAR periodic surface deformation and displacement data. When the displacement rate in the final monitoring area exceeds the warning threshold, an alarm is triggered, and subsequent on-site verification and remediation are carried out.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

1. An automatic monitoring method for landslides along regional transmission lines, characterized in that: Includes the following steps: Step 1: Collect medium-scale regional topographic maps, medium-scale regional geological maps, spatial coordinate information of each tower of the transmission line, and InSAR periodic data of the target area. After converting the data into a unified coordinate system, the topographic elevation, tower coordinate information, regional stratigraphic attitude information, and InSAR surface deformation and displacement data are overlaid to form a comprehensive plan view. Step 2: Using a computer program, on the integrated plan, first take each transmission tower as the center, and gradually increase the search radius to search for the top of the slope where each transmission tower is located; Step 3: Using a computer program, draw rays from the top of each slope towards the transmission tower. Using these rays as the center line, draw rays every 4 to 6 degrees around the top of the slope, deflecting 60 to 70 degrees to both sides. This will obtain the foot of the slope for each ray. Step 4: Taking each transmission line tower as a unit, after geological professionals review and correct the slope top and slope toe information determined by the above method indoors, connect the slope toe points of the slope where the transmission line tower is located, and the resulting slope toe line is used as the lower boundary. Two rays that deflect 60-70° to the left and right of the ray from the slope top toward the transmission line tower are used as the left and right boundaries. The 135-140° "fan-shaped" area with the slope top as the vertex is the monitoring area to be confirmed. Step 5: With the top of the slope as the center, draw a ray towards the transmission tower. Take the slope foot on the previously obtained ray as the other endpoint. The resulting line segment is the horizontal projection line of the typical cross-section of the transmission tower slope on the comprehensive plan. Based on this line segment and the intersecting elevation lines, the ground slope line of the typical cross-section can be drawn. Step 6: Perform a straight line fitting on the ground slope line from the toe of the slope to the transmission tower. The minimum angle between the fitted straight line and the horizontal line is the slope angle of the slope. Furthermore, on the comprehensive plan, taking the slope crest as the center and starting from due north, the angle of clockwise rotation to the horizontal projection line of the typical section is the slope inclination τ. 坡 The dip angle of the rock strata in this slope area was obtained by reading the regional geological map. and rock strata dip τ 岩 ; Step 7: Based on the slope conversion formula, adjust the slope dip direction τ. 坡 and rock strata dip τ 岩 This is transformed into the slope orientation and the orientation of the rock strata. If |slope strike - rock stratum strike| ≤ 70° and This indicates that there is a risk of large-scale sliding along the slope. The monitoring area needs to start from the toe of the slope. At this point, the monitoring area to be confirmed is the final monitoring area of ​​the transmission tower slope. If |slope strike - rock strata strike| > 70° or The potential sliding mode is the collapse of the surface soil of the slope, so the lower boundary of the monitoring area can be shortened. The method for determining the lower boundary of the monitoring area is as follows: draw a 20m vertical line segment downwards at the transmission tower on the typical cross-section ground slope line. Taking the lower end of this line segment as the starting point, draw a ray horizontally downwards towards the slope toe at an angle of rupture θ. The intersection of the ray and the ground slope line is the lower boundary point of the final monitoring area on the typical cross-section. Measure the horizontal distance l between this lower boundary point and the transmission tower. Then, on the comprehensive plan, draw a circle with the transmission tower as the center and l as the radius. The area enclosed by the intersection of the circle and the left and right boundaries of the monitoring area to be confirmed is the final monitoring area of ​​the transmission tower slope. Step 8: For the final monitoring area corresponding to each transmission line tower, periodic monitoring is carried out using InSAR periodic surface deformation and displacement data. When the displacement rate in the final monitoring area exceeds the warning threshold, an alarm is triggered, and subsequent on-site verification and remediation are carried out.

2. The automatic monitoring method for landslides on regional transmission lines according to claim 1, characterized in that: In the second step, the criteria for determining the top of the slope are: search for the elevation information of the intersection of a certain radius line on the search circle, and if the elevation above the transmission tower first shows a trend of increasing and then decreasing, the point with the highest elevation on this radius line is the top of the slope where each transmission tower is located.

3. The automatic monitoring method for landslides on regional transmission lines according to claim 2, characterized in that: The elevation must continue to decline for more than 10 meters.

4. The automatic monitoring method for landslides on regional transmission lines according to claim 1, characterized in that: In the third step, a computer program is used to draw rays from the top of each slope to the direction of the power transmission tower on the comprehensive plan. Elevation information is searched outward along the rays. When the first 30m horizontal distance drop difference is ≤5m, or when the trend of first dropping and then rising is first shown, the endpoint of the 30m segment near the top of the slope in the former, or the starting point of the rising segment in the latter, is the foot of the slope on that ray.

5. The automatic monitoring method for landslides on regional transmission lines according to claim 4, characterized in that: The elevation rise trend needs to continue for more than 10m.

6. The automatic monitoring method for landslides on regional transmission lines according to claim 1, characterized in that: In the seventh step, 7. The automatic monitoring method for landslides on regional transmission lines according to claim 1, characterized in that: In the seventh step, 8. The automatic monitoring method for landslides on regional transmission lines according to claim 1, characterized in that: In the seventh step, if the horizontal distance l between the lower boundary point and the transmission tower is greater than or equal to the horizontal distance between the slope toe and the transmission tower, the monitoring area to be confirmed should be taken as the final monitoring area.

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