| Insights into a giant landslide-prone area on the eastern margin of the Tibetan Plateau,China |
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| 作者姓名： | ZHAO Bo WANG Yun-sheng LI Jia WANG Jian-lin TANG Chen-xiao |
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| 作者单位： | Key Laboratory of Mountain Hazards and Earth Surface Processes;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection;Sichuan Institute of Geological Engineering Investigation Group Co.;China Southwest Geotechnical Investigation&Design Institute Co. |
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| 基金项目： | supported by the National Key Research and Development Program of China(Grant No.2017YFC1501000);the National Natural Science Foundation of China(Grant No.42007273,41877235);Youth Fund of Institute of Mountain Hazards and Environment CAS(Zhao Bo);Special Assistant Researcher Foundation of Chinese Academy of Sciences(ZHAO Bo,TANG Chen xiao);China Postdoctoral Science Foundation(2020M673292)。 |
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| 摘 要： | A good understanding of giant landslide-prone areas could greatly enhance the understanding of the formation and failure mechanisms of giant landslides.In this study,a classic giant landslide-prone area named the Diexi area located along the upstream stretch of the Minjiang River on the eastern Tibetan Plateau is adopted to analyze the failure mechanism and evolution process by detailed field investigations,Unmanned Aerial Vehicle(UAV)images and a digital surface model(DSM).The results show that among the 37 giant landslides located in the Diexi area,18 landslides are transverse landslides(wedge failure),and the others are consequent landslides(buckling failure).All landslides blocked rivers,and some barrier lakes still remain.The Diexi area features special geological structural conditions related to the hinge section of the Jiaochang arc tectonic belt,the intersection of two active fault zones(the Songpinggou and Minjiang fault zones)and high levels of geostress.The numerous radial fissures induced by the Jiaochang arcuate belt provided lateral sliding boundaries for buckling deformation(consequent landslides)and head scarps for wedge failure(transverse landslides).The rapid incision(1.88 mm/yr)since the middle Pleistocene formed a deep gorge with steep slopes and strong lateral unloading.Frequent earthquakes and rainfall further reduced the rock mass integrity,and strong earthquakes or other factors triggered the landslides.
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| 关 键 词： | Giant landslides Diexi area Arcuate tectonic belt |
Insights into a giant landslide-prone area on the eastern margin of the Tibetan Plateau,China |
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| ZHAO Bo,WANG Yun-sheng,LI Jia,WANG Jian-lin,TANG Chen-xiao.Insights into a giant landslide-prone area on the eastern margin of the Tibetan Plateau,China[J].Journal of Mountain Science,2021(1). |
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| Abstract: | A good understanding of giant landslideprone areas could greatly enhance the understanding of the formation and failure mechanisms of giant landslides. In this study, a classic giant landslideprone area named the Diexi area located along the upstream stretch of the Minjiang River on the eastern Tibetan Plateau is adopted to analyze the failure mechanism and evolution process by detailed field investigations, Unmanned Aerial Vehicle(UAV)images and a digital surface model(DSM). The results show that among the 37 giant landslides located in the Diexi area, 18 landslides are transverse landslides(wedge failure), and the others are consequent landslides(buckling failure). All landslides blocked rivers, and some barrier lakes still remain. The Diexi area features special geological structural conditions related to the hinge section of the Jiaochang arc tectonic belt, the intersection of two active fault zones(the Songpinggou and Minjiang fault zones) and high levels of geostress. The numerous radial fissures induced by the Jiaochang arcuate belt provided lateral sliding boundariesfor buckling deformation(consequent landslides) and head scarps for wedge failure(transverse landslides). The rapid incision(1.88 mm/yr) since the middle Pleistocene formed a deep gorge with steep slopes and strong lateral unloading. Frequent earthquakes and rainfall further reduced the rock mass integrity, and strong earthquakes or other factors triggered the landslides. |
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