怒江构造混杂岩带多拉寺滑坡的易滑地质结构及高位启滑运动机制

张永双; 任三绍; 李金秋; 廖国忠

doi:10.3799/dqkx.2023.017

Volume 48 Issue 12

Dec. 2023

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Article Navigation > Earth Science > 2023 > 48(12): 4668-4679

Zhang Yongshuang, Ren Sanshao, Li Jinqiu, Liao Guozhong, 2023. Prone Sliding Geo-Structure and High-Position Initiating Mechanism of Duolasi Landslide in Nu River Tectonic Mélange Belt. Earth Science, 48(12): 4668-4679. doi: 10.3799/dqkx.2023.017

Citation:

Zhang Yongshuang, Ren Sanshao, Li Jinqiu, Liao Guozhong, 2023. Prone Sliding Geo-Structure and High-Position Initiating Mechanism of Duolasi Landslide in Nu River Tectonic Mélange Belt. Earth Science, 48(12): 4668-4679. doi: 10.3799/dqkx.2023.017

Citation:

Zhang Yongshuang, Ren Sanshao, Li Jinqiu, Liao Guozhong, 2023. Prone Sliding Geo-Structure and High-Position Initiating Mechanism of Duolasi Landslide in Nu River Tectonic Mélange Belt. Earth Science, 48(12): 4668-4679. doi: 10.3799/dqkx.2023.017

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Prone Sliding Geo-Structure and High-Position Initiating Mechanism of Duolasi Landslide in Nu River Tectonic Mélange Belt

doi: 10.3799/dqkx.2023.017

Zhang Yongshuang^{1, 2
,
,},
Ren Sanshao^{1, 2},
Li Jinqiu^{1, 2},
Liao Guozhong³

1.
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
2.
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
3.
Chengdu Center, China Geological Survey, Chengdu, 610081, China

Received Date: 2022-10-30
Available Online: 2024-01-03
Publish Date: 2023-12-25

Abstract

Abstract

The Duolasi landslide is a super-large scale ancient landslide located in the Nu River tectonic mélange belt, which is characterized by the combination control of typical geological structure and special lithology. In this paper, several technical means, such as field investigation, geophysical exploration, unmanned aerial vehicle mapping, geo-mechanics and chronological testing, were applied to reveal the prone sliding geological structure, multi-stage development characteristics and high-position initiating mechanism of the Duolasi landslide. The results show follows: (1) The thick-bedded marble and ophiolite are stacked alternately and the corresponding clay-altered zone is an important prone-sliding geological structure of the Duolasi landslide. The altered clay is an important factor to the high-speed and long run-out of the landslide. (2) The Duolasi landslide has the characteristics of multi-stage activity, and can be divided into the main sliding body area, the secondary sliding body area and the modern colluvial area. The formation age of the main sliding body is 19.4±2.8 ka, and that of the secondary sliding bodies is 4.24±0.35 ka. (3) The high-position initiating process of the main landslide is closely related to factors such as steep slope landform, multi-permeable karst structure, weak base effect of altered clay, and seismic dynamic triggering. (4) The main landslide presents a pseudo-stratigraphic pattern of layered accumulation, i.e., coarse boulders in the upper part and fine-grained materials in the lower part, indicating that the overall landslide is mainly shear motion, and the material in the upper part of the landslide moves faster than the material in the lower part. The above understanding can provide a reference for the formation mechanism research and risk control of large scale landslides in the tectonic mélange belt on the east Tibetan plateau.
- prone sliding geo-structure,
- clayey altered rock,
- tectonic mélange belt,
- high-position landslide,
- pseudo-stratigraphic model,
- engineering geology

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References(40)

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Prone Sliding Geo-Structure and High-Position Initiating Mechanism of Duolasi Landslide in Nu River Tectonic Mélange Belt

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