ABSTRACT
With the rapid development of transportation in our country, traffic lines will be inevitably through the mountains, and road slopes are widely distributed. The top of the slope will be cut into different soil blocks in the process of contacting with atmospheric, raining water, biological, physical and chemical change. Integrity of the slope is damaged and broken. The collapse phenomenon of rock falls will happen under earthquake, which is a serious threat to the safety of the existing structures at the foot of slope. In recent years, the collapse of the slope under earthquake occur repeatedly, such as, Wenchuan (Ms = 8.0) earthquake which happen in 2008 caused a lot of collapse, and damaged rail and road, Yungui (Ms = 5.7) earthquake which happen in 2012 caused a lot of collapse, and damaged lot of houses, as shown in Figure 1.
