Application Test of Anti-Interference Electrical Method Instrument to Urban Geophysical Prospecting in Tongzhou, Beijing

Abstract

With the rapid development of the city, it is necessar y 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.