摘要
瞬变电磁法对于施工区地表有较强的适应能力，工作效率较高。选用适当的装置可将瞬变电磁法应用于地下洞体的探测，其数据处理解释是采用全期定义将实测瞬变衰减曲线转换为视电阻率—深度曲线，根据地下洞体的瞬变电磁响应特征分析等视电阻率曲线的形态来确定洞体的存在。此方法已通过多次实际应用取得了良好的地质效果。在１９９３、１９９７年两次北京门头沟区老窑勘查工程中由瞬变电磁法圈定出的老窑经钻孔验证成功率达８０％，证明了该方法探测地下洞体的有效性。
The transient electromagnetic method has a stronger adaptability to the surface of construction area,with a higher effectivity.Using the suitable apparatus the transient electromagnetic method could be used to prospect the underground cave.Its data processing and interpretation use the full time definition,transferring the measured transient attenuation curve to the apparent resistivitydepth curve,the existence of underground cave is determined based on the shape of isoapparent resistivity curve analyzed by the characteristics of transient electromagnetic response of underground cave.The better geologic effectivities had been obtained by this method through the practical application in many times.In the old workings prospects in Mentougou area,Beijing,in 1993 and 1997,the old workings delimited by the transient electromagnetic method had the 80% of success ratio of borehore verification,proved that this method is available in prospect of underground cave.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
1999年第2期64-68,共5页
Coal Geology & Exploration
关键词
瞬变电磁法
地下洞室
有效性
隧道
测深
transient electromagnetic method
underground chambers
results
