CHARACTERISTICS AND FORMATION MECHANISM OF GEO-HAZARDS TRIGGERED BY WENCHUA MS.8.0 EARTHQUAKE ALONG DUJIANGYAN TO WENCHUAN HIGHWAY

Geo-hazards that triggered by the Wenchuan Ms8.0 earthquake along the Dujiangyan to Wenchuan Highway are especially severe and have seriously affected the safe riding along the highway and the reconstructions.In order to prevent and reduce disasters effectively,regional geological hazards have been studied in the area on the basis of the field investigations and statistic analysis of available data.The results show the following three prominent characteristics of hazards in the area: in terms of distribution geologic hazards are linear ribbon and intensively,have many types and are notably divided into sectors; the high and steep rock deposits of complex origin form the main material foundation of geological hazards; intense earthquake effect and coupling of androgenic and exogamic forces are the important factors for the formation and occurrence of geological hazards in the area.This paper provides a scientific basis for the study of the mechanism of occurrence of the geo-hazards triggered by earthquake in the area and measures for their prevention and control.