Abstract: The seepage issue of dam foundation is a critical factor determining whether the dam can op_ erate stably in long term. The rock mass fracture zone in dam foundation is often the direct cause of seep_ age. Taking the geophysical investigation work of the dam in Guazhongling reservoir as an example, the frequency electromagnetic sounding method is adopted. By comparing with subsequent drilling and sam_ pling results, the result shows that the frequency electromagnetic sounding method has high accuracy in detecting rock fracture zones in dam foundation, which can provide reliable evidence for the design of seepage prevention treatment plans for dam foundation.

Key words: frequency electromagnetic sounding method, rock fracture zone in dam foundation, dam foundation seepage

摘要： 坝基渗漏问题是决定大坝能否长期稳定运行的关键因素，而坝基岩体破碎带往往是产生坝基渗漏的直接原因。以挂钟岭水库大坝物探勘察工作为例，以频率电磁测深法为物探手段，探查拟建场地内岩体破碎带分布情况。与后序钻孔取样结果对比显示，频率电磁测深法在探查坝基岩体破碎带方面具有较高的精度，可以为坝基防渗处理方案的设计工作提供可靠的依据。

关键词: 频率电磁测深法, 坝基岩体破碎带, 坝基渗漏