THE STRATIGRAPHIC STRUCTURE AND STABILITY ANALYSIS IN GENTLE SLOPES OF PIEDMONTAT NINGZHEN AREA

In recent years, due to the influence of extreme heavy rainfall weather, many medium-sized and large-scale landslides had occurred on the gentle slopes of Ningzhen area. These landslides were mainly manifesting intermittent creep, large scale, and small slip distance, generally less than 30 m, which seriously threatens the safety of lives and property of residents, and causes huge economic losses and serious adverse social effects. In the paper, based on this new type of landslide geological hazard, the stratum structure and sliding mechanism of the landslide had been researched by using the cybernetics of rock mass structure and preferred plane theory. The results show that the landslide mainly occurred in the Piedmont gentle slope area, and there are special stratum structure and hydrogeological characteristics of the landslide body. The confined water would be easily produced in the slope body with heavy rainfall. Under the action of buoyancy of confined water, the burst and shear failure would produce mainly in the gentle slope, and the intermittent creep of the landslide grow with rainfall.