矿井瞬变电磁超前探测物理实验

Physical experiment of mine transient electromagnetic advanced detection

采用盐水充当均匀围岩介质,使用玻璃槽充当巷道空间,建立了含巷道全空间瞬变电磁超前探测的物理模型,根据矿井瞬变电磁超前探测扇面扫描的数据采集方式,对柱状良导体与低阻薄板的超前探测响应特征进行了实验模拟。结果表明:异常体在瞬变电磁超前探测扇面扫描的多测道剖面图上存在异常响应,异常响应特征与异常体的空间位置、空间形态有关;当柱状良导体位于掘进工作面正前方时,3个扫描方向响应最强,晚期道出现"双峰"异常;低阻薄板与柱状良导体的响应不同,多测道剖面图上响应值增大过程中无明显"台阶"状的跃变,响应值增大趋势与薄板倾向一致。

Adopted brine as the uniform surrounding rock medium,used a glass tank as roadway space,and established the full space physical model of transient electromagnetic advanced detection.Based on the sectoral scan data acquisition modes of mine transient electromagnetic advanced detection,the advanced detection response characteristics of a good guide cylinder and a low resistance plate was simulated.Results show that：there are some response characteristics of the abnormal body in multi-channel profile,these characteristics relate to the space position and the space shape of the abnormal body;when the good guide cylinder is in front of the drivage face,the responses from three scanning directions on the face are strongest,and the late-time curves appear double peak;the response of the low resistance plate is different from the good guide cylinder,there is no obvious ＂step＂ change in the Multi-channel profile,the response value increasing trend is agreed with the plate.