Basic Characteristics and Meteorological Risk Assessment of Highway Geological Hazard in Sichuan Province

In this paper，utilize highway geological hazard data of 2007～2013 and 30 years of reorganization Rainfall data， analyze the basic characteristics of highway geological hazards in Sichuan， establish the index system of risk assessment of geological hazards in Sichuan highways.The main conclusion:The main geological hazards are debris flow，collapse，landslide and flood which effect the safe of highway in Sichuan Province， in recent 7 years， the number of Sichuan highway geological hazards is rising year by year which triggered by rainfall.There is a good corresponding relationship between the monthly distribution of Sichuan highway geological hazards and monthly rainfall， most occurred in July， August second， the seasonal variation of rainfall determines the seasonal variation of highway geological hazards.The hazard occurred mainly at 9 a.m.to 10a.m and 15 p.m.Selecting the annual average number of disaster of 49 highway， monthly rainfall from May to October， the maximum daily rainfall， rainstorm day number from May to October， annual rainfall， then using Principal Component Analysis（PCA） to grade the risk of highway geological disaster， risk assessment level can provide reference to the highway in the risk zoning of geological hazards.