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Volume 42 Issue 7
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HUANG Xiao-hu, YI Wu, GONG Chao, HUANG Hai-feng, YU Qing. Reactivation and deformation mechanism of ancient landslides by excavation[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1276-1285. DOI: 10.11779/CJGE202007011
Citation: HUANG Xiao-hu, YI Wu, GONG Chao, HUANG Hai-feng, YU Qing. Reactivation and deformation mechanism of ancient landslides by excavation[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1276-1285. DOI: 10.11779/CJGE202007011
shu

Reactivation and deformation mechanism of ancient landslides by excavation

  • 1.

    Key Laboratory of Disaster Prevention and Mitigation of Hubei Province, China Three Gorges University, Yichang 443002, China

  • 2.

    National Field Observation and Research Station of Landslides in the Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang 443002, China

  • 3.

    Ningxia Electric Power Design Institute Co., Ltd., Yinchuan 750000, China

  • 4.

    Yunnan Coalfield Geology Bureau, Kunming 650034, China

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  • Received Date: July 16, 2019
  • Available Online: December 05, 2022
    Graphical Abstract
    • Abstract
  • The Dalixi ancient landslide in Xingshan County in the Three Gorges Reservoir area is taken as an example. Based on the analysis of its characteristics, the deformation characteristics and temporal-spatial laws of surface cracks of the ancient landside in the process of landslide revival are analyzed by use of geological survey, site inspection for nearly one year, artificial GPS displacement monitoring data and automatic monitoring data. Based on the Geo-Studio simulation, the influences of excavation and rainfall on the revival deformation of the ancient landslide and the primary and secondary relationships are determined. The results show that: (1) The Dalixi landslide is a middle-steep consequent ancient rock landslide with soft layer in geological history period. (2) The deformation of Dalixi landslide is closely related to excavation. In the early stage, it concentrates near the leading edge Q3 of the first excavation area, and gradually appears along the excavation direction at the leading edge Q4 and Q5, and finally evolves into the secondary landslides near the leading edge Q5. At the same time, the vertical deformation gradually advances to the middle and rear, showing the characteristics of progressive retrogression. (3) The excavation is the inducing factor for the revival of landslide deformation, and the rainfall is the stimulating factor. Both of them work together to promote the sustainable development of landslide deformation
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    • References (17)
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