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溶洞是遂道施工中的安全隐患,利用高频电磁法沿遂道规划线进行了张量电磁法勘探。研究表明测区灰岩区电阻率呈高阻,电阻率大于4000Ω·m,浮土和砂岩区电阻率呈低阻,电阻率在800~4000Ω·m之间。获得了测区的电阻率分布特征及浮土、灰岩和砂岩的分布规律。通过对电阻率异常特征的分析指出了测区的构造分布及溶洞可能存在的位置。测区岩洞并不发育,但由岩体破碎所引起电阻率异常则较多。岩溶发育区位于48号点标高310m的区域,电阻率异常主要位于17~18、30~31点,标高320m区域。
Karst cave is a potential safety hazard in the tunnel construction. Tensor electromagnetic exploration is carried out along the tunnel planning line by high-frequency electromagnetic method. The results show that the resistivity of the limestone zone in the survey area shows high resistance, the resistivity is more than 4000Ω · m, the resistivity of the earth and sand area is low resistance, and the resistivity is between 800 and 4000Ω · m. The resistivity distribution of the survey area and the distribution rules of the earth, limestone and sandstone were obtained. Based on the analysis of the resistivity anomaly characteristics, the tectonic distribution of the survey area and the possible location of the cave are pointed out. The caves are not developed, but the resistivity anomalies caused by the crushing of the rock mass are more. The karst development zone is located in the area of No.38 elevation 310m, and the resistivity anomalies are mainly located in the areas of 17-18, 30-31 and elevation 320m.