高密度电法在硬质岩区勘察中探测岩性接触带的应用效果

寻找岩性接触带是岩土工程地质勘察的一项重要任务，通常采用钻探、物探、槽探、坑探及地质调绘等手段来勘测岩性接触带，而这些方法都具有一定局限性。在硬质岩区往往由于岩性变化形成不同视电阻率的异常特征，通常利用高密度电法的视电阻率断面图的异常特征，可确定岩性接触带。通过阐述高密度电法测量的基本原理，分析高密度电法在硬质岩区岩土工程地质勘察中探测岩性接触带的应用效果，探讨其在硬质岩区应用中的优点与不足，为技术人员运用高密度电法在硬质岩区勘查时提供参考。

HighmDensity Electrical Method in Detecting Lithology of Hard Rock Survey and Application Effect of Contact Zone

It is an important task to explore the lithological contact zone in the field of soil engineering geological exploration. Traditional methods for the exploration of lithological contact zone include drilling, geophysical prospecting, trenching, pit exploration, geolog- ical mapping and so on. However, these methods have certain limitations. In hard rock are- as, due to the changes in lithology formation , apparent resistivity becomes abnormal, thus we can make use of this abnormal phenomenon to determine the lithological contact zone. This paper describes the basic principle of high density electrical measurement, and analy- zes its application in the lithological contact zone of rock and soil engineering hard rock geo- logical survey. We discussed the advantages and disadvantages of high density electrical measurement, and provides a reference for technical staff in hard rock area exploration.