高山峡谷地区桥址区岩溶发育特征地球物理勘察

doi:10.11720/wtyht.2021.1211

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Abstract

Karst development characteristics such as depth, fillings and distribution direction are key questions during geophysical survey of bridge site in Alpine gorge area. Satisfactory information of geophysical survey is not available due to influences of weathering,rock,groundwater and topography.In order to improve efficiency of geophysical exploration, shallow seismic method, audio frequency magnetotelluric method and symmetric four-pole sounding method are used for raising geophysical exploration efficiency. As a result, exploration accuracy is improved in turn, and content of exploration is verified by each other. Characteristics of apparent, macroscopic and microcosmic Karst development are obtained.Method of geophysical comprehensive exploration mentioned above can provide reference for similar projects.

Key words： alpine gorge area karst shallow seismic method audio frequency magnetotelluric method symmetric four-pole sounding method

Received: 27 April 2020 Published: 01 March 2021

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	Ze-Feng LU

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Ze-Feng LU. Geophysical exploration of karst development characteristics in bridge site of the alpine gorge area[J]. Geophysical and Geochemical Exploration, 2021, 45(1): 252-256.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1211 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I1/252

General layout of bridge

Stratigraphic table of bridge site

Velocity and resistivity of rock and soil layers

Time profile of shallow seismic exploration

Explanatory chart of audio-frequency magneto telluric method,symmetric four-pole sounding method and geological profile

Interpretation results of electric sounding

Comprehensive interpretation results of Karst development

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