Risk Assessment Index System for Soil-Similar Slopes and Application in Highway Engineering

The influence of rainfall on slope geological hazards was analyzed, the method of effective rainfall was improved, and the impact of rainfall on slope was classified based on the effective rainfall. Combined with the characteristics of geology, climate, rock mass structure, earthquake, and slope protection of the highway in the Yunnan Province of China, the safety risk assessment index system and grading criteria of soil-similar slopes consisting of strongly weathered soft rock and extremely soft rock soil were established under the conditions of strong rainfall and high intensity earthquake, in which the sources of risk such as the scale of slope, geological conditions, deformation and destruction, surrounding environment, and inducing factors were taken into account. The reliability and feasibility of the index system and grading criteria were verified through during the engineering of the second-grade highway from Lancang to Menglian to Meng’a in Puer City, Yunnan Province, China.