摘要
指出了高密度电法对不同物性的地质体分辨能力较强,是探测异常地质体的一种有效方法。广州某盐矿采空区发生震动、开裂、下沉等地质灾害,运用高密度电法对盐矿采空区浅部(地表以下100 m)进行了探测,共布置导线12条,通过分析电阻率断面图,发现低阻异常区19处,因卤水是良导体,其电阻率极低,推断低阻异常区可能是深部卤水通过构造、裂隙运移至浅部形成的含卤水带(或构造带)。可见,高密度电法可为分析研究地质灾害发生原因提供有效地地球物理依据,应广泛地推广使用。
The high-density electrical method has strong ability to distinguish geological bodies with different physical properties,and is an effective method for detecting abnormal geological bodies.12 survey lines based on the high-density electric method are placed to evaluate the potential geological hazard such as vibration,cracking and subsidence in the shallow part(100m below the surface)of the goaf area in the nitrate mine of Guangzhou City.By analyzing the resistivity profiles,19 abnormal areas with low resistivity were found.It is inferred that the low-resistance anomaly area may be a brine-containing zone(or structural zone)formed by deep brine migration through structures and cracks to shallow parts.The high-density electrical method is an effective geophysical tool for analyzing and predicting geological disasters and should be widely used.
作者
李茹
Li Ru(Guangzhou Geological Survey Institute,Guangzhou,Guangdong 510440,China)
出处
《绿色科技》
2021年第12期190-192,共3页
Journal of Green Science and Technology
基金
广州市多要素城市地质调查(编号:DD20190291)。
关键词
高密度电法
地质灾害
低阻异常
high-density electrical method
geological hazard
low-resistance anomaly
