Stability Evaluation And Hazard Risk Analysis Of A Special Kind Of Landslide In Loess Area Of China

Landslide in loess layer and mudstone-loess interface landslide are the most typical and common kinds of landslides in loess area, which are the most concerned subject in the study of geological hazards in the loess area of China. The coal resources in the loess region of China are very plentiful with a lot of coal mines. While, the landslide caused by mining collapse in the coal mining area is also very typical, which is an important part in hazard the geological control work in coal-mining collapse land. But the study and achievements are relatively scarce in this kind of landslide. However this kind of landslide is special, which unable to get enough attention especially in the landslide risk management. In this case, the representative landslide was study on the stability evaluation and the risk analysis in order to lay a theoretical foundation in the landslide in the loess area of geological hazard.HTPPL(Hua-Ting Power Plant Landslide)was selected as the research object, using field investigation, engineering geological mapping, engineering geological investigation, laboratory test and numerical simulation, focusing on the landslide stability evaluation and risk analysis. Specific content as follows:(1)By using the engineering geological drilling to identify landslide thickness, material structure, deformation behaviour features, groundwater characteristics and structure features of the strata, and soil sampling test analysis obtain geotechnical physical and mechanical indexes. The stability of the HTPPL were analyzed base on the theory of the limiting equilibrium theory. The results of analysis show that the body and slope at the back of main scarp will slide or slide again inevitably in conditions of earthquakes and extreme torrential rain weather.(2)The work of simulating were done using Discrete Element software 2D-block and Finite Element software Geo-Studio module Sigma. It was found that significant deformation starts at the place where tensile fracture crosses sandy mudstone,especially at the end of each fracture, the slope is most prone to slide in these parts.(3)The differences of the impact of various landslide hazard risk index in HTPPL were analyzed including the factor of type, morphological characteristics, extent and scale, stability, travel distance and causes by comparing with the typical loess landslide in loess area in China.