Highway Perilous Rock Disaster Mechanism And The Risk Analysis On The Full Life-Cycle

China has a vast territory.Its geological conditions and climate are very extremely complicated and changeable and it has a large number of mountain valleys.In recent years,the high grade highway has extended to the mountain area,Along the highway,collapse disasters always happen,which has a serious impact on highway traffic safety.Most of the studies are still mainly based on geological rock and rarely combined with the research on highway rock factor.It has become an urgent problem facing all researchers to combine the road factors to accurate analysis,evaluate,and predicate the mechanism of highway perilous rock disaster mechanism and the risk analysis on the full life-cycle.According to the domestic and foreign research status on rock and disaster control technology,this paper mainly analyzes highway disaster mechanism of perilous rock,stability and risk evaluation.A relatively complete analysis system for highway rock analysis has been established: Mechanism--Stability--Risk assessment.The main research results are as follows:(1)The catastrophic mechanism of highway rock has been summarized as geological role,formation lithology,terrain landform action,groundwater,rainfall,weathering,unloading,human engineering activities,and road factor.(2)The rock groups,relative height,the development scale,collapse history,fissure water development degree,brake identification coefficient and the average traffic risk have been selected as highway perilous rock risk analysis on the full life-cycle index.(3)Fuzzy judgment method and the single hierarchical analysis judgment model have been established based on the seven aspects of evaluation index.Highway perilous rock risk has been divided into four levels combined with our country’s highway reality.(4)Through the analysis of the full life cycle-risk of Chongqing-Guizhou Expressway perilous rock,the analysis results are in good agreement with the actual results.