The geological structure and sliding mode of the slopes in the Yigong landslide source area, Tibet

XIN Peng; WANG Tao; LIU Jiamei; LIU Feng; DU Jianjun; ZHAO Jianlei

doi:10.12090/j.issn.1006-6616.2022072

Volume 28 Issue 6

Dec. 2022

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Article Navigation > Journal of Geomechanics > 2022 > 28(6): 1012-1023

DENG Jingen, LIU Shujie, SHI Deqin, et al., 1999. CALCULATION OF ELASTOPLASTIC DEFORMATION OF WELLBORE IN SOFT MUDSTONE USING LAGRANGIAN METHOD. Journal of Geomechanics, 5 (1): 35-39.

Citation:

XIN Peng, WANG Tao, LIU Jiamei, et al., 2022. The geological structure and sliding mode of the slopes in the Yigong landslide source area, Tibet. Journal of Geomechanics, 28 (6): 1012-1023. DOI: 10.12090/j.issn.1006-6616.2022072

DENG Jingen, LIU Shujie, SHI Deqin, et al., 1999. CALCULATION OF ELASTOPLASTIC DEFORMATION OF WELLBORE IN SOFT MUDSTONE USING LAGRANGIAN METHOD. Journal of Geomechanics, 5 (1): 35-39.

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The geological structure and sliding mode of the slopes in the Yigong landslide source area, Tibet

doi: 10.12090/j.issn.1006-6616.2022072

XIN Peng^{1, 2, 3
,},
WANG Tao^{1, 2, 3},
LIU Jiamei^{1, 2, 3},
LIU Feng¹,
DU Jianjun^{1, 2, 3},
ZHAO Jianlei^{1, 2, 3}

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.
Observation and Research Station of Geological Disaster in Baoji, Shaanxi Province, Ministry of Natural Resources, Beijing 100081, China

Funds:

the Geological Survey Project of the China Geological Survey DD20221816

the Geological Survey Project of the China Geological Survey DD20211378

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Abstract

Abstract

The unstable slopes of BH01, BH02, and BH03 in the Yigong landslide source area in Tibet threaten the safety of major engineering facilities downstream. In order to prevent and control the disaster risk caused by the high-elevation sliding of blocks, it is urgent to analyze the geological structure of the slope in the above-mentioned source area and their deformation trends. Based on the Pleiades digital elevation model with a precision of 2 m and its topographical shadow, this paper draws up evidence from three aspects: quantitative geomorphology, geological structure, and landslide science. In addition, it is preliminarily determined that the source area of the Yigong landslide has four secondary slope units, including the cuesta in the front imbricated thrust-fault zone, the block in the thrust-fault zone, the block in the strike-slip fault zone, and the NE-trending rift zone. There are two primary control structural planes in the slope, dipping southeast and southwest, respectively. The geological survey of the line has confirmed that the above two groups of structural planes are related to thrust faults and strike-slip faults in the imbricated nappe. The NE-trending rift crosscutting the ridge may be related to the recent EW-extensional deformation of the nappe. With the above-mentioned geological structures, the slopes in the Yigong landslide source area show multi-stage and multi-phase deep sliding along the NE-trending rift zone and have the creep-tension-shear sliding mechanism with rock landslide. According to the extension depth of the tensile fractures in the source area, the BH02 block has the potential risk of accelerated slippage. Moreover, the BH03 block is also unstable.
- geological disaster,
- Yigong landslide,
- source area,
- imbricated nappe structure,
- fault,
- sliding mode

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