小功率瞬变电磁仪在浅层溶洞探测应用探讨

Discussion on the Application of Shallow-Layer Karst Cave Detection by the Low-Power TEM Instrument

瞬变电磁法具有对地下水反应敏感,分辨率高的特点。使用YCS256矿用瞬变探测仪,此仪器属于小功率瞬变电磁仪,采用共中心分离回线装置线圈,对贵州汪家寨煤矿新建斜井附近地表灰岩溶洞发育情况进行了探查,指出车场及新建斜井附近地表以下100 m范围内,地表灰岩中溶洞发育的概况及其富水性分析,为新建斜井掘进提供了可靠的技术支持。经斜井疏放水和掘进验证资料表明,小功率瞬变电磁仪在地表浅层灰岩富水性探测中具有较高的分辨率和准确性。

The transient electromagnetic instrument （TEM） has characteristics of sensitivity to ground water and high resolution. Using the mine transient detector of YCS256, a low-power TEM instrument adopting the loop device coil of total center separation, the cave development on surface limestone near the newly-buih inclined shaft of Wangjiazhai Coal Mine was explored. The exploration resulted in the general information of cave development and water yield analysis in the parking lot and the inclined shaft within 100 meters under the ground ,which provided re- liable technical support for the tunneling of new inchned shaft. The water drainage and excavation data of the in- clined shaft showed that the low-power TEM instrument had higher resolution and accuracy in detecting water in shallow-layer limestone.