Application of electric resistivity imaging and radon measurement in ground fissures survey
It is difficult to explore ground fissures in plain areas because of their hidden characteristics. Comprehensive geophysi-cal exploration with its advantages of convenience and economic efficiency can quickly identify the spatial distribution, scale, and characteristics of ground fissures, and directly produce exploration results. Radon measurement method can detect the location of ground fissure, while high-density resistivity method can display the spatial characteristics of ground fissures. Combination of the above two methods can mutually complement and verify each other and obtain improved interpretation of the results. In this study, four comprehensive geophysical profiles were laid out near Gouquzhuang Village and Dapang Village for the Songzhuang ground fissures in Tongzhou, covering 330 high-density resistivity measurement points and 163 radon measurement points. The study found that the typical response of high-density resistivity measurement to ground fissures is resistivity isopleth abnormal changes, and develops low resistance zones when resistivity of the surrounding rock is relatively high. The response of radon mea-surement is anomalous peak values, most of which are saddle-like. Based on the measurement results, 10 ground fissures have been inferred, and their corresponding geophysical characteristics of the ground fissures summarized.
万方数据
维普
