瞬变电磁法在探测煤矿采空区及其积水区的应用

瞬变电磁法是目前工程勘察中应用较广的物探方法之一。该方法观测纯二次场,故分辨率高,可分辨出地下规模较小的不均匀体,尤其对低阻地质体反应灵敏。在山西七岭煤矿边界老窑采空区探测中,基于采空区及其积水区与完整围岩在视电阻率值上的明显物性差异,利用瞬变电磁法在视电阻率值上的相对低阻异常来圈定采空区及其积水区,为准确划分煤矿采空区及其积水区的位置提供依据。

The Application of TEM to Detecting Mine Goaf and Accumulated Water Area

Transient electromagnetic method is one of the most widely used geophysical prospecting methods in engineering exploration at present. This method observes the two pure fields, so it has high resolution, which can distinguish the smaller inhomogeneous body under the ground. It is especially sensitive to the low resistivity geologic body. In the detection of Shanxi Seven Ridge Mine boundary goaf area, based on the obvious differences between goaf and accumulated water area and the intact rock in apparent resistivity values, the transient electromagnetic method is used to delineate the mined - out area and water accumulated area. This method provides criteria for dividing the coal mining goaf andaccumulated water area.