GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN

GUO Qiaoqiao; GUO Changbao; SHEN Wei; ZHANG Guohua; SONG Haoxiang; ZHOU Qingqiang

Volume 23 Issue 5

Oct. 2017

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Article Navigation > Journal of Geomechanics > 2017 > 23(5): 788-797

JI Q J，ZHOU W W，HAN R S，et al.，2024. Characteristics of life-cycle stages and reservoir control in the development of extensional faults in the Dongying Sag[J]. Journal of Geomechanics，30（4）：595−608 doi: 10.12090/j.issn.1006-6616.2023147

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GUO Qiaoqiao, GUO Changbao, SHEN Wei, et al., 2017. GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN. Journal of Geomechanics, 23 (5): 788-797.

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GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN

GUO Qiaoqiao^{1, 3
,},
GUO Changbao^{1, 2
,
,},
SHEN Wei³,
ZHANG Guohua⁴,
SONG Haoxiang^{1, 3},
ZHOU Qingqiang⁴

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China
3.
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
4.
Geological Prospecting Team, Sichuan Geological & Mineral Bureau, Chengdu 610072, Sichuan, China

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Abstract

Abstract

High density resistivity method and conventional resistivity sounding method are applied in the exploration analysis of the space structure of a series of typical large-giant ancient landslides such as the Gamisi landslide, the Ezhaicun landslide and the Gejizhai landslide. The survey results show that the slip surfaces of ancient landslides are unstable and have low resistance electrical layers. Also the fronts of the landslides are mostly located in the convergence area of the unstable electrically thin layers. Among them, the unstable electrical layer thickness of the Ezhaicun landslide of high and low resistance is about 0~45 m, and it is the landslide accumulation layer. The sliding surface is close to the bedrock surface with the burial depth of about 30 m. The burial depth of weakly weathered bedrock surface is about 5.6~61 m, and the thickness of strong weathered layer is about 3~12 m. The unstable electrical layer thickness of the Gamisi landslide of high and low resistance is about 2.5~43 m, and it is the landslide accumulation layer. The average burial depth of ancient sliding surface along the profile is about 35 m. In the middle of the landslide there is a circle of closed low resistance anomaly bodies, which are speculated as the paleo-channels with the burial depth of about 56~96 m. The burial depth of weakly weathered bedrock surface is about 13.3~100 m, and the thickness of strong weathered and karst complex layer is about 5~20 m. Based on the geophysical exploration data and interpretation results of ancient landslides, the geophysical parameters of spatial rock-soil bodies of large-giant ancient landslides in the Minjiang River Valley were analyzed, which are of great significance to guide the investigation and analysis of landslides in this area.
- The Minjiang River Valley,
- large-giant ancient landslide,
- electrical prospecting,
- sliding surface

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GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN

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GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN

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