Research on Geohazard Developing Characteristics in Jiacha to Langxian Section of Sichuan-Tibet Railway

Abstract

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.

Key words: Sichuan-Tibet Railway, Yarlung Zangbo fault zone, geohazard, developing characteristic, high-speed and long-runout landslide

CLC Number:

P642.2

WU Rui’an, GUO Changbao, DU Yuben, WANG Ke, DU Guoliang. Research on Geohazard Developing Characteristics in Jiacha to Langxian Section of Sichuan-Tibet Railway[J]. Geoscience, 2017, 31(05): 956-964.

Figures/Tables 10

Fig.1 Geological structure background of the study area

Fig.2 Distribution of geological hazards in Jiacha to Langxian section along the Sichuan-Tibet Railway

Fig.3 Developing characteristics of Ri’amo landslide in Jiacha

Fig.4 Lagang giant long-runout landslide in Jiacha (NW)

Fig.5 Remote sensing image of Gurulangjie landslide

Fig.6 A-A' profile of Gurulangjie landslide

Fig.7 Donggeshan landslide group in Langxian

Fig.8 Bajitang landslide group in Langxian

Fig.9 Relationship between the sliding direction of landslide and the trend of Yarlung Zangbo fault

Fig.10 Redui landslide in Jiacha (SE)

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