Abstract: Long- term operation and the influence of natural environment may lead to seepage, cracks and other defects on rockfill dam with inclined clay core, posing a threat to the stability of dam body. This paper proposes the joint application of opposing coils transient electromagnetic method (OCTEM) and ground- penetrating radar (GPR) to the safety evaluation of rockfill dams with inclined clay core, and explores the effectiveness of these two methods in detecting the internal structure and potential defects of the dam. The research shows that OCTEM can effectively identify the internal blasting accumulation line of the dam body, and also can discover multiple seepage problems. The GPR can clearly show the interfaces between upstream panel layer, the sand layer and the clay layer, and identify problems such as insufficient compaction, surface voids and local settlement. The combined application of these
two methods not only enables comprehensive detection of both the dam′s surface and internal structure but also compensates for their respective limitations, forming an effective detection system that provides reliable basis for dam safety evaluation.

Key words: rockfill dam with inclined clay core, opposing coils transient electromagnetic method,  , ground penetrating radar

摘要： 长期运行和自然环境的影响可能导致黏土斜墙堆石坝坝体出现渗漏、裂缝等隐患，对坝体稳定构成威胁。笔者提出将等值反磁通瞬变电磁法与探地雷达联合应用于黏土斜墙堆石坝安全评估，探讨这两种方法在探测坝体内部结构和潜在隐患方面的效果。结果显示，等值反磁通瞬变电磁法能有效识别坝体内部爆破堆积线，还发现多处渗漏问题；探地雷达能清晰呈现迎水坡面板层、细砂层与黏土层界面，识别出密实度不足、表层空隙及局部沉降等隐患。两者联合应用，不仅能够实现对坝体表面和内部的全面探测，还能互补各自的局限性，形成有效探测体系，为坝体安全评估提供可靠依据。

关键词: 黏土斜墙堆石坝, 等值反磁通瞬变电磁法, 探地雷达