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2021 Vol. 48, No. 5
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WU Rui’an, MA Haishan, ZHANG Juncai, YANG Zhihua, LI Xue, NI Jiawei, ZHONG Ning. Developmental characteristics and damming river risk of the Woda landslide in the upper reaches of the Jinshajiang River[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 120-128. doi: 10.16030/j.cnki.issn.1000-3665.202104036
Citation: WU Rui’an, MA Haishan, ZHANG Juncai, YANG Zhihua, LI Xue, NI Jiawei, ZHONG Ning. Developmental characteristics and damming river risk of the Woda landslide in the upper reaches of the Jinshajiang River[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 120-128. doi: 10.16030/j.cnki.issn.1000-3665.202104036
shu

Developmental characteristics and damming river risk of the Woda landslide in the upper reaches of the Jinshajiang River

  • 1.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing　100081, China

  • 2.

    Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources, Beijing　100081, China

  • 3.

    Geological Environmental Monitoring Station of Tibet Autonomous Region, Lhasa, Tibet　850000, China

  • 4.

    Qinghai Institute of Geo-Environment Monitoring, Xining, Qinghai　810008, China

More Information
Received Date:  15 April 2021
Revised Date:  14 June 2021
Publish Date:  15 September 2021
    Abstract

  • The Woda landslide in the upper reaches of the Jinshajiang River, has been deformed since 1985, whose surface deformation characteristics are obvious now. There is a potential risk that the landslide will slide further and block the Jinshajiang River. Based on the remote sensing interpretation, field investigation, engineering geological drilling and comprehensive monitoring, the spatial structure and deformation characteristics of the landslide are analyzed, the potential reactivation instability pattern of the landslide is clarified, and the risk of landslide blocking river is discussed by empirical formula calculation. The results show that the Woda landslide is a huge landslide with a volume of about 28.81×106 m3. It is speculated that the landslide had undergone massive sliding before the late Pleistocene. The whole landslide is currently creeping, and the local part of the landslide is in the accelerated deformation stage. The deformation range of reactivation zone is mainly concentrated in the middle and front parts, and the failure characteristics are progressive backward. The deformation on the right side of the reactivation zone is stronger than that on the left side. There are two sliding zones developing in the landslide, namely the shallow zone and deep sliding zone, whose average depth is about 15 m and 25.5 m, respectively. Accordingly, the landslide can be reactivated with two potential failure modes: the shallow slip and deep slip with progressive failure mode. When the sliding mass in the strong deformation area of the Woda landslide slides along the shallow sliding zone, the height of the landslide dam formed is about 87.2 m. If the whole sliding mass slides along the deep sliding zone, the height of the landslide dam formed is about 129.2 m. The Woda landslide has the risk of landslide-damming-outburst-flood chain disaster. It is suggested to further strengthen landslide monitoring and carry out drainage, reinforcement and other prevention works. This study can offer certain reference for preventing and controlling large geological disaster chain in the upper reaches of the Jinshajiang River.

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