Abstract: With the effect of groundwater, calcareous sandy conglomerate in area of Guanyinyan hydropower station was corroded along the direction of bedding or steep fracture, forming larger cystic cavity or hole. It was essential to find out the spatial distribution of corrosion rock. As sporadic and isolated distribution of corrosion rock, conventional geophysical detection method was difficult to achieve the purpose. By contrast test, a suitable detection technique combined with transient electromagnetic method, ground penetrating radar method and corresponding data processing method was used for Guanyinyan hydropower station, which achieved expected results.

Key words: corrosion rock, transient electromagnetic method, ground penetrating radar

摘要： 观音岩水电站坝址区钙质砂砾岩在地下水作用下，沿层理方向或陡倾角裂隙产生溶蚀，形成规模较大的囊状空腔或孔洞，需要查明溶蚀岩体的空间分布情况。但由于岩溶呈零星、孤立的条带状、囊状、陡倾分布，常规的物探检测方法难以达到目的。本工程通过试验找出适合溶蚀岩体检测的瞬变电磁法和探地雷达法，以及相应数据处理技术，最终取得预期成果。

关键词: 溶蚀岩体, 瞬变电磁法, 探地雷达法