Characteristics and mechanism of deformation of chair-shaped soil landslides in Three Gorges Reservoir area

DENG Mao-lin; ZHOU Jian; YI Qing-lin; ZHANG Fu-ling; HAN Bei; LI ZHUO Jun

doi:10.11779/CJGE202007013

Volume 42 Issue 7

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Chinese Journal of Geotechnical Engineering > 2020 > 42(7): 1296-1303. > DOI: 10.11779/CJGE202007013

DENG Mao-lin, ZHOU Jian, YI Qing-lin, ZHANG Fu-ling, HAN Bei, LI ZHUO Jun. Characteristics and mechanism of deformation of chair-shaped soil landslides in Three Gorges Reservoir area[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1296-1303. DOI: 10.11779/CJGE202007013

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Characteristics and mechanism of deformation of chair-shaped soil landslides in Three Gorges Reservoir area

DENG Mao-lin^{1, 2, 3,},
ZHOU Jian^{1, 2, 3, ,},
YI Qing-lin^{1, 2, 3},
ZHANG Fu-ling^{1, 2, 3},
HAN Bei^{1, 2, 3},
LI ZHUO Jun^{1, 2, 3}

1.
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang 443002, China
2.
Hubei Key Laboratory of Disaster Prevention and Mitigation (China Three Gorges University), Yichang 443002, China
3.
National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang 443002, China

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Received Date: May 23, 2019
Available Online: December 05, 2022

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Abstract

Since its impoundment, the displacement-time curve of many landslides especially the chair-shaped soil ones in the Three Gorges Reservoir area has gradually changed, which makes the identification of stable state difficult and seriously affects the early warning and forecast of landslides. Based on the example of Baijiabao landslide, through many field geological surveys and long-term on-site inspections, and by use of more than 10 years of GPS displacement monitoring data, more than one year of fully automatic monitoring data and landslide theories, the deformation and evolution laws of the landslide under water fluctuations and rainfalls are studied in depth. The results show that the main factor inducing the deformation during the flood season and rise and fall of reservoir water level is the fall of reservoir waterlevel. The annual displacement is 35~250 mm, the historical displacement has a fluctuation of "W" type, and the first step of 30~180 mm of displacement is completed in about 20~30 d. When the water level of the reservoir drops by 25 m and the elevation of the water level is about 150 m, the displacement step starts. When the reservoir water level drops to 145 m, after one week the maximum displacement of the step is 5~8 mm/d. During the rise of the reservoir water level, the rainfall has no effect on the deformation of the landslide. Restricted by the structural characteristics of the chair-shaped slopes, the slope will be repeatedly deformed under the action of the rise and fall of water level, but it is difficult to cause overall damage.
- chair-shaped soil landslide,
- displacement step,
- Baijiabao landslide,
- deformation mechanism,
- reservoir water level

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