CN-121999385-A - Dangerous rock mass caving ground disaster investigation and evaluation method and system

CN121999385ACN 121999385 ACN121999385 ACN 121999385ACN-121999385-A

Abstract

The invention discloses a dangerous rock body caving ground disaster investigation and evaluation method and system, wherein the method comprises the steps of extracting parent image spots and dangerous rock body image spots in remote sensing images of investigation areas, dividing high-risk areas and potential-risk areas, extracting first buffer image spots of the potential-risk areas, creating convex hulls to generate rock body caving-risk areas, acquiring remote sensing images of new investigation areas after earth surface deformation occurs, extracting image spots of earth surface deformation areas, acquiring second buffer image spots, and creating new convex hulls to generate new rock body caving-risk areas. According to the technical scheme, before ground disasters such as landslide and flood occur, rock mass caving dangerous areas are obtained and divided on the remote sensing images in a mode of combining inner industry analysis and outer industry mapping with stepping investigation, and after ground disasters such as landslide and flood occur, the new rock mass caving dangerous areas can be obtained and divided quickly based on new remote sensing images and combined with modes such as superposition gland analysis.

Inventors

ZHAO FEI
Ma Zhangyang
WANG CHAO
ZHANG XIUMEI
Zhu Xiaoshuan
ZHOU BING
NIE YOUJUN

Assignees

重庆飞翔地质工程勘察有限公司

Dates

Publication Date: 20260508
Application Date: 20260127
Priority Date: 20250326

Claims (8)

1. The dangerous rock mass caving ground disaster investigation and evaluation method is characterized by comprising the following steps of: s1, acquiring a space model of dangerous rock mass in an investigation region, a remote sensing image of the investigation region and topographic elevation data of the investigation region; s2, extracting parent pattern spots and dangerous rock pattern spots in remote sensing images of investigation regions; s3, setting the maximum rolling diameter of the rock block of the caving rock; S4, dividing a high-risk area and a potential-risk area in the remote sensing image of the investigation region; s5, extracting first buffer pattern spots of the potential dangerous area, setting a plurality of radial analysis lines with equal included angles by taking the center point of the pattern spots of the dangerous rock as a round point, wherein each radial analysis line positioned in the potential dangerous area at least passes through two first buffer pattern spots; S6, extracting first buffer image spots which are located on radial analysis lines of the potential dangerous areas and are closest to the center point of the dangerous rock mass image spots, creating a convex hull containing the dangerous rock mass image spots, and combining the convex hull with the high dangerous areas to generate rock mass collapse dangerous areas; s7, after the earth surface deformation occurs, acquiring a new remote sensing image of the investigation region, and extracting map spots of the earth surface deformation region; s8, overlapping the map spots of the surface deformation area with the first buffer map spots, and acquiring a second buffer map spot from the first buffer map spots based on an overlapping result; S9, extracting second buffer image spots closest to the center point of the dangerous rock mass image spots on each radial analysis line, creating a new convex hull containing the dangerous rock mass image spots, and merging with a high dangerous area based on the new convex hull to generate a new rock mass caving dangerous area; In S2, setting the maximum rolling diameter of the rock blocks of the caving rock mass comprises the steps of vertically projecting a space model of the dangerous rock mass on a horizontal plane to form projection pattern spots, measuring the minimum circumscribed rectangular diagonal length L of the projection pattern spots, and setting the maximum rolling diameter W1=alpha L of the rock blocks of the caving rock mass, wherein alpha is a coefficient, and the value range is more than or equal to 1 and less than or equal to 2.
2. The dangerous rock caving ground disaster investigation evaluation method according to claim 1, wherein in S4, dividing the high-risk area and the potential-risk area in the remote sensing image of the investigation region comprises: If not, drawing a connecting line between the dangerous rock mass pattern spot and the central point of the parent pattern spot, drawing a perpendicular line of the connecting line, dividing the remote sensing image of the investigation region by the perpendicular line, reserving an image part containing the dangerous rock mass pattern spot and deleting the parent pattern spot as an analysis region; Measuring the height of the space model, drawing a circle by taking the central point of the dangerous rock pattern spot as the center of a circle and the height of the space model as the radius, and marking the area, covered by the circle, in the analysis area as a high dangerous area; and marking the area after the high-risk area is removed from the analysis area as a potential risk area.
3. The dangerous rock caving ground disaster investigation and evaluation method according to claim 2, wherein in S6, extracting a first buffer pattern spot closest to a dangerous rock pattern spot center point on each radial analysis line of the potential dangerous area, creating a convex hull containing dangerous rock pattern spots, merging with the high dangerous area based on the convex hull, and generating the rock caving dangerous area comprises: Extracting radial analysis lines in a potential danger zone; Selecting a first radial analysis line arranged at the outermost side, and finding out a first buffer pattern spot closest to the center point of the dangerous rock pattern spot along the radial analysis line; Selecting adjacent radial analysis lines, checking whether the radial analysis lines pass through the found first buffer pattern spots, if so, selecting the next adjacent radial analysis line for checking, if not, finding the first buffer pattern spots closest to the center point of the dangerous rock pattern spots along the radial analysis lines, and repeating the steps, traversing all the radial analysis lines in the potential dangerous area to extract and find the first buffer pattern spots closest to the center point of the dangerous rock pattern spots on each radial analysis line; creating a convex hull, wherein each extracted and found first buffer pattern spot and dangerous rock pattern spot are positioned in the convex hull; and extracting a region overlapping with the analysis region in the convex hull, and combining the region with the high risk region to generate a rock mass caving risk region.
4. The dangerous rock caving ground disaster investigation and evaluation method according to claim 1, wherein in S8, overlapping the map spots of the surface deformation area with the first buffer map spots, and obtaining the second buffer map spots from the first buffer map spots based on the overlapping result comprises: Overlapping and capping the map spots of the surface deformation area and the first buffer map spots; traversing each first buffer pattern spot, and extracting the first buffer pattern spots with the gland in the surface deformation area pattern spots; Analyzing the duty ratio of the area of each first buffer pattern spot covered by the cover, deleting the first buffer pattern spot if the duty ratio exceeds a first threshold value, and reserving the part of the first buffer pattern spot which is not covered by the cover as an intermediate pattern spot if the duty ratio does not exceed the first threshold value; the middle pattern spots and the first buffer pattern spots which are not in the deformation area of the ground surface and have the gland form second buffer pattern spots.
5. The dangerous rock caving ground disaster investigation and evaluation method according to claim 1, wherein the value range of the first threshold value is 70% -80%.
6. The dangerous rock caving ground disaster investigation and evaluation method according to claim 1, wherein in S7, the map spots of the surface deformation area comprise map spots of landslide areas and/or map spots of flood rushing areas.
7. The method of dangerous rock caving ground disaster investigation and evaluation according to claim 1, wherein in S5, the extraction of the first buffer pattern comprises an intra-industry mode, wherein the intra-industry combines with the topographic elevation data to extract the pattern of the topographic feature which can obstruct rock rolling as the first buffer pattern
8. A dangerous rock caving ground disaster investigation and evaluation system, characterized by comprising a processor and a memory, wherein the memory stores a plurality of instructions, and the processor loads the instructions from the memory to execute the dangerous rock caving ground disaster investigation and evaluation method according to any one of claims 1-7.

Description

Dangerous rock mass caving ground disaster investigation and evaluation method and system Technical Field The invention relates to the technical field of geological disaster investigation and evaluation, in particular to a dangerous rock body caving ground disaster investigation and evaluation method and system. Background Dangerous rock body caving ground disasters usually occur in terrain breaking areas such as steep slopes, cliffs and the like, and are characterized in that rock bodies fall off from a parent body under the action of gravity and roll along the ground surface after contacting the ground surface (the toe of the parent body) until the rock bodies encounter a river, a groove, a gentle terrain or a buffer-zone terrain feature such as a blocking dam and the like and stop rolling. The rock mass is broken down to form a rolling stone, the main monomer of which has a large weight and is easy to roll, and therefore, the stone is easy to move to a position far from a parent body, and the damage caused by the stone is large. Currently, many dangerous areas after rock mass collapse overlap with human activity areas, so proper control measures are required to avoid life and property loss when disasters occur. Specifically, for prevention and control of dangerous rock mass caving ground disaster, the conditions of rock mass stability, disaster easily-occurring grade and the like are determined through early-stage investigation and evaluation, and a dangerous area and a safe area when the disaster occurs are defined according to a rolling estimated area after rock mass caving by combining a field investigation mode. For rock mass with poor stability and high caving risk, disaster threat can be controlled by adopting a mode of cutting square in advance or constructing a stone blocking dam (ditch). For areas with relatively stable rock mass and low disaster susceptibility, a mode mainly based on monitoring is adopted, so that personnel and materials are prevented from entering dangerous areas as much as possible. However, when a local geological disaster such as a rainfall landslide occurs, the local surface topography is changed, and the safety area determined by the early investigation may be partially changed into a dangerous area, and if personnel and substances enter the dangerous area converted from the safety area, the risk of loss is high. If the dangerous area and the safe area are redetermined by adopting the field investigation method, the method takes a long time and has a certain safety risk for the investigation personnel. Disclosure of Invention The invention aims to provide a dangerous rock caving ground disaster investigation and evaluation method and system, which can divide dangerous areas at a higher speed after local surface topography changes and reduce loss risks. According to a first aspect of the present invention, there is provided a dangerous rock body metrorrhagia plague investigation and evaluation method, comprising: s1, acquiring a space model of dangerous rock mass in an investigation region, a remote sensing image of the investigation region and topographic elevation data of the investigation region; s2, extracting parent pattern spots and dangerous rock pattern spots in remote sensing images of investigation regions; s3, setting the maximum rolling diameter of the rock block of the caving rock; S4, dividing a high-risk area and a potential-risk area in the remote sensing image of the investigation region; s5, extracting first buffer pattern spots of the potential dangerous area, setting a plurality of radial analysis lines with equal included angles by taking the center point of the pattern spots of the dangerous rock as a round point, wherein each radial analysis line positioned in the potential dangerous area at least passes through two first buffer pattern spots; S6, extracting first buffer image spots which are located on radial analysis lines of the potential dangerous areas and are closest to the center point of the dangerous rock mass image spots, creating a convex hull containing the dangerous rock mass image spots, and combining the convex hull with the high dangerous areas to generate rock mass collapse dangerous areas; s7, after the earth surface deformation occurs, acquiring a new remote sensing image of the investigation region, and extracting map spots of the earth surface deformation region; s8, overlapping the map spots of the surface deformation area with the first buffer map spots, and acquiring a second buffer map spot from the first buffer map spots based on an overlapping result; S9, extracting second buffer image spots closest to the center point of the dangerous rock mass image spots on each radial analysis line, creating a new convex hull containing the dangerous rock mass image spots, and merging with the high-risk area based on the new convex hull to generate a new rock mass caving risk area. According to the dangerous rock body caving ground disa