CHARACTERISTICS AND FORMATION MECHANISM OF GEOLOGICAL HAZARDS ALONG THE SECTION FROM NYINGCHI TO BAXOI OF THE SICHUAN-TIBET HIGHWAY

Geological hazards along the section from Nyingchi to Baxoi of the Sichuan-Tibet Highway are especially severe and have seriously affected the safe riding along the highway. 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 close-spaced, have many types and are notably divided into sectors; loose Quaternary deposits of complex origin form the main material foundation of geological hazards; intense water-rock interaction and coupling of endogenic and exogenic 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 geological hazards in the area and measures for their prevention and control.