现代地质2017，Vol.31Issue(5)：956-964,9.
川藏铁路加查—朗县段地质灾害发育特征研究
Research on Geohazard Developing Characteristics in Jiacha to Langxian Section of Sichuan-Tibet Railway
摘要
Abstract
The Jiacha to Langxian section of the Sichuan-Tibet Railway is located in the middle reach of the Yarlung Zangbo river in the southeast of the Tibetan plateau.It is one of the regions in China suffering from serious geological hazards,where topography is complex;tectonic activities are intense as well as high density geohazards develop in this area.On the basis of data collection and remote sensing,this study made a survey of geohazards in Jiacha to Langxian section of the Sichuan-Tibet Railway and investigated 139 geohazard spots including landslides,collapses and mudslides five kilometers from railway on both sides in an area of 780 km2.This study also discovered a high-speed and long-runout landslide in Lagangcun and Ri'amo large landslide along the Yarlung Zangbo river.The geohazard developing characteristics and formation mechanism are analyzed in this paper.Research results show that Yarlung Zangbo fault has definite control action on the morphology and rock mass structure,resulting in landslides and collapses zonally distributed along the fault,and that is one of the main geohazard developing characteristics in the study area,and the sliding directions of about 53％ of collapses and landslides are perpendicular to the strike of the Yarlung Zangbo fault,while about 30％ are parallel to the fault.Under the influence of rapid uplift of the crust and river erosion,developing characteristics of geohazards have remarkable differences between open valley and canyon along Yarlung Zangbo river.Fault activities,especially earthquakes induced by the violent activities of faults offer geological background for high-speed and long-runout landslides,i.e.high-speed and long-runout landslide in Lagang.The coupling effects of endogenic and exogenic process,containing fault activities,rainfall and engineering activities,make the formation mechanism of geohazards more complex,and some landslides in bad stability can be reactive repeatedly,imposing a negative influence on planning construction of major projects,and the prevention and reduction of geohazards.关键词
川藏铁路/雅鲁藏布江断裂/地质灾害/发育特征/高速远程滑坡Key words
Sichuan-Tibet Railway/Yarlung Zangbo fault zone/geohazard/developing characteristic/high-speed and long-runout landslide分类
天文与地球科学引用本文复制引用
吴瑞安,郭长宝,杜宇本,王珂,杜国梁..川藏铁路加查—朗县段地质灾害发育特征研究[J].现代地质,2017,31(5):956-964,9.基金项目
中国地质调查局项目(12120113038000) （12120113038000）
国家自然科学基金项目(41402321) （41402321）
中铁二院科研计划(二院科字201303). （二院科字201303）
