Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 273-284.doi: 10.13278/j.cnki.jjuese.20190019

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Geological and Geophysical Electric Characteristics of Typical Landslides in Three Gorges Reservoir

Lin Song1,2, Wang Wei1,2, Deng Xiaohu2, Zha Yanhong2, Zhou Hongwei2, Cheng Miao1,2   

  1. 1. Hubei Key Laboratory of Earthquake Early Warning, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;
    2. Wuhan Institute of Earthquake Engineering Co. Ltd., Wuhan 430071, China
  • Received:2019-01-28 Published:2020-02-11
  • Supported by:
    Supported by National Natural Science Foundation of China (41572354)

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Abstract: Landslide is one of the most important types of geological hazards. It is of great significance to find out the geological and geophysical characteristics of a landslide area for analyzing the formation mechanism of a landslide and evaluating its stability. In view of this, the high-density resistivity method was first introduced into the landslide geological survey of Wanzhou area in the hinterland of the Three Gorges Reservoir area, and the geophysical exploration of Sifangbei landslide, Tangjiao No. 1 landslide, and Maliulin landslide was carried out in the area. The measured results were compared and verified with borehole data. Through data inversion and analysis, the stratum structure and slip surface of landslide bodies are obtained; By combining with the relevant geological data and comparative interpretation, it can make up for the deficiency of only relying on borehole information to determine the shape of slip surface; According to the measured data of the three typical landslide areas, the geophysical and electrical characteristics of landslide mass and sliding bed are as follows, resistivity of landslide mass composed of colluvium, quaternary silty clay and water bearing gravel block is less than 40 Ω·m, while resistivity of sliding bed composed of sandstone and mudstone is more than 40 Ω·m. It is proved that the high-density electrical method can get better results for both bedrock landslide and soil landslide.

Key words: Three Gorges Reservoir, landslide, geophysical characteristics, geological characteristics, slide bed

CLC Number: 

  • P315
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