多期次崩塌灾害的数值模拟研究.

The dangerous rock mass is widely distributed in southwest China, and is easy to formate collapse for many times. In order to study the collapse disasters reported in the terrain, the accumulation of subsequent collapse rockfalls characteristics, this paper, by using multiphase collapse simulation method, can reflect the changing situation and the threat range of the deposit after many times collapse according to certain probability, and supplement the deficiency of the conventional calculation result of once collapse of stones. It provides a scientific basis for the prevention and control of geological disaster in the study area in the following period. This paper takes the Xujiadabang collapse in Sinan County, Guizhou Province as an example. The multi-stage numerical simulation of unstable rock collapse is studied based on laboratory tests and numerical simulation, combined with GIS technology and 3D collapse software. The numerical simulation results of four stages of collapse by using the characteristic parameters obtained from physical experiments are in good agreement with the field investigation results. It is found that almost all of the large size rockfalls and most of the small size rockfalls are deposited in the area with a slope less than 35°. More than 90% of the rockfall deposits in the 30 m buffer zone on the abandoned road surface, that is, 100 m away from the residential area. The percentage of rockfall deposits in the direction of the abandoned road toward the cliff shows an upward trend. The nearest large particle size rockfall is mainly 60 m away from the residential area, and the possibility of threatening the residential area is low. A small number of small particle size rockfalls will fall to the residential area. The research ideas and technical methods in this paper have reference values and significance for the study of multi-stage dangerous rockfall. [ABSTRACT FROM AUTHOR]