三峡库区典型滑坡地质与地球物理电性特征

doi:10.13278/j.cnki.jjuese.20190019

Abstract

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

Lin Song, Wang Wei, Deng Xiaohu, Zha Yanhong, Zhou Hongwei, Cheng Miao. Geological and Geophysical Electric Characteristics of Typical Landslides in Three Gorges Reservoir[J].Journal of Jilin University(Earth Science Edition), 2020, 50(1): 273-284.

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

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