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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。
Finding the lithologic contact zone is an important task in geotechnical prospecting. The methods of drilling, geophysical exploration, trenching, pit exploration and geological mapping are usually used to survey lithologic contact zones, and these methods all have some limitations. In the hard rock area, the abnormal characteristics of apparent apparent resistivity are often formed due to the lithology changes. The lithological contact zone can be determined by using the abnormal characteristics of the apparent resistivity profile of the high-density electrical method. By describing the basic principle of high-density electrical measurement, the application of high-density electrical method to detect lithological contact zone in geotechnical geological exploration of hard rock area is analyzed, and its advantages and disadvantages in the application of hard rock area are discussed. For technical staff to use high-density electrical method for reference in the hard rock exploration.