摘要
为了研究煤矿积水采空区的瞬变电磁响应特征,建立了煤矿积水采空区的理论模型,计算了瞬变电磁响应曲线,分析了典型的积水采空区瞬变电磁响应特征。理论计算结果表明,在被探测的采空区具备地球物理条件的前提下,瞬变电磁法(TEM)对积水采空区反应明显,且横向分辨率较高;对高阻采空区反应不明显;垂向上有多层积水采空区时,瞬变电磁的延迟效应会导致瞬变电磁法纵向分辨率降低,在一定深度范围内难以分辨引起电磁异常的具体层位。桑树坪煤矿积水采空区探测应用表明:理论结果与现场实际情况相符合,表明该方法是切实有效的。
In order to study electromagnetic response features of a water accumulated goaf in a coal mine,a theoretical model of the water accumulated goaf in the mine was established.A transient electromagnetic response curve was calculated and the electromagnetic response features of the typical water accumulated goaf were analyzed.The theoretical calculation results showed that on the premise of the goaf de-tected had the geophysical conditions,the transient electromagnetic method would have an obvious reaction to the water accumulated goaf and a lateral resolution would be high.The transient electromagnetic method would not have an obvious reaction to a high resistance goaf. When the goaf had several layers of water accumulation in vertical direction,a delay effect of the transient electromagnetic would make a longitudinal resolution reduced of the transient electromagnetic method and would be hard to distinguish a certain layer level to cause the e-lectromagnetic abnormal in a certain depth scope.The detection application of the water accumulated goaf in Sangshuping Mine showed that the theoretical results and the site actual condition would be fitted and the method was real effective.
出处
《煤炭科学技术》
CAS
北大核心
2014年第8期109-112,共4页
Coal Science and Technology
基金
中国煤炭科工集团西安研究院自筹资金科技创新基金资助项目(2013XAYCX021)
关键词
积水采空区
瞬变电磁法
延时效应
电磁响应
water accumulated goaf
transient electromagnetic method
time-delay effect
electromagnetic response
