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针对工程建设中常见的地下空穴问题的特殊性,从理论和实践两方面分析了运用瞬变电磁法进行地下空穴探测的有效性及地下空穴瞬变电磁响应的物理过程和信息反馈特征。结合工程实例,介绍了瞬变电磁法探测地下空穴的原理、手段以及地质解译方法,对大型地下空穴这类非层状体系的探测做了全新的尝试,并应用钻探工程验证了探测效果。实践证明,地下空穴的瞬变电磁信息非常典型,能够提供准确的地质灾害预报以指导各种不同的地面施工,对同类复杂工程具有一定的借鉴意义。
Aimed at the peculiarity of underground cavities common in engineering construction, this paper analyzes the validity of underground hole detection by using transient electromagnetic method and the physical process and information feedback characteristics of underground hole transient electromagnetic response both in theory and practice . In combination with engineering examples, the principle, method and geologic interpretation method of transient electromagnetic detection of underground cavities are introduced. A new attempt is made to detect non-layered systems such as large underground cavities. The drilling project verifies the detection effect. Practice has proved that the underground cavity transient electromagnetic information is very typical, can provide accurate prediction of geological disasters to guide a variety of ground construction, for similar complex projects have some reference.