Landslide volume calculation method based on Lidar terrain and borehole sliding surface reconstruction

Abstract

The invention provides a landslide volume calculation method based on Lidar terrain and borehole sliding surface reconstruction, which is used for more accurately determining the landslide volume and providing powerful data support for landslide stability evaluation and engineering prevention and control. The method comprises the steps of obtaining a first DEM of an ancient landslide area before a landslide event occurs in a target slope body area, wherein the first DEM is used for representing a slope body structure of the ancient landslide area; constructing a corresponding sliding surface based on the elevation information of the real drill hole of the target slope body area; constructing a virtual drilling hole on the basis of the sliding surface, and calculating elevation information of a virtual drilling hole point on the sliding surface according to the obtained thickness from the slope surface to the sliding surface corresponding to the virtual drilling hole; combining the elevation information of the real drill hole and the virtual drill hole and the boundary of the target slope body area to construct a second DEM for representing the slope body structure of the target slope body area; and determining the landslide volume of the landslide event based on the comparison result of the first DEM and the second DEM on the slope body structure.

Description

technical field [0001] This application relates to the field of geology, in particular to a landslide volume calculation method based on Lidar topography and borehole sliding surface reconstruction. Background technique [0002] In nature, landslides exist under the complex effects of geological conditions and various factors. As a typical geological disaster, their existence may bring harm to the ecological environment and even the personal safety of residents. Due to the existence of frequent human engineering activities The area is more prone to landslides. [0003] After the landslide occurs, the accumulated body formed by it may cause hazards such as house burial, road interruption, and river blockage, and directly affect the development of post-disaster search and rescue and relief material transportation. The degree and scope of the threat caused by the landslide largely depends on Therefore, the accurate calculation of landslide volume is particularly important in t...

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Problems solved by technology

[0004] And in the research process of existing relevant technology, inventor finds, the determination strategy of existing landslide volume is for example, 1. field measurement method, mainly by measuring the length and width of landslide body, calculate landslide body surface area, combine Obtaining the volume of the landslide body from the thickness of the landslide body estimated by on-site geophysical drilling, the workload is heavy and cumbersome, and the accuracy of the obtained volume is not high; 2. The geometric method divides the landslide body into different blocks and uses the corresponding volume formula Or the calculation of landslide volume based on the principle of integration also has the problem of field measurement; 3. Numerical simulation method, combined with the knowledge of soil mechanics, simulates and restores the process of landslide occurrence, and uses scripts to calculate the volume of landslides. The parameters required in the process are heterogeneous in space and time, and the restoration process is not accurate

The accuracy of these existing determination strategies is not high or the actual determination effect is unstable, which affects the practical application value of the slope volume

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