Abstract
With the rapid development of the city, it is necessary to obtain geological information within 500 meters. Electrical prospecting is not only low cost and simple operation, but also solves the problem of insufficient drilling density in a survey. However, due to the dense urban buildings and strong electromagnetic interference, it is difficult for traditional electrical instruments to obtain effective data. An anti-interference electrical method instrument is designed. In the application test of Tongzhou core area in Beijing, the resistivity sounding data collected by anti-interference electrical method instrument is stable and reliable; inversion results of sounding are basically consistent with borehole data; the known Zhangjiawan fault and Yaoxinzhuang fault are obvious; basement karst collapse area inferred is basically coincident with the historical collapse area. It is proved that the anti-interference electrical method instrument is effective and can be applied to the geological survey of underground space in other cities.
Highlights
The anti-interference coding electrical method instrument is improved from the traditional electrical method instrument by Beijing Explo-Tech Engineering Co., Ltd
In the application test of Tongzhou core area in Beijing, the resistivity sounding data collected by anti-interference electrical method instrument is stable and reliable; inversion results of sounding are basically consistent with borehole data; the known Zhangjiawan fault and Yaoxinzhuang fault are obvious; basement karst collapse area inferred is basically coincident with the historical collapse area
This paper introduces comprehensively the application test in the geophysical electrical prospecting of Tongzhou core area in Beijing, which obtained the electrical parameters of the stratum within 500 meters underground, verifies the known Zhangjiawan fault and Yaoxinzhuang fault, infers the scope of karst collapse area, and provides an important reference for the future urban construction
Summary
The anti-interference coding electrical method instrument is improved from the traditional electrical method instrument by Beijing Explo-Tech Engineering Co., Ltd. The purpose is to solve the problem of electromagnetic interference and improve the quality of data acquisition. Wang Hongbo and others collected reliable polarizability data in the graphitized area of Inner Mongolia, which made up for the data gap in this area [6]; Nian Xingping have obtained a large number of electrical anomalies in the keketale lead zinc-mining area of Xinjiang, which provided an important basic data for comprehensive prospecting [7]. This paper introduces comprehensively the application test in the geophysical electrical prospecting of Tongzhou core area in Beijing, which obtained the electrical parameters of the stratum within 500 meters underground, verifies the known Zhangjiawan fault and Yaoxinzhuang fault, infers the scope of karst collapse area, and provides an important reference for the future urban construction
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