高密度电法在灵新煤矿采空区探测中的应用

The Appilication of High-Density Electrical Method in Lingxin Coal Mine Goaf Detecting

高密度电法已广泛应用于煤层采空区的探测中,采空区充填的性质不同造成其在高密度电法数据剖面中的表现特征也不一样。文章主要介绍运用高密度电法工作进行煤矿老窑采空区探测的案例。采用高密度电法中的温纳装置对灵新煤矿老窑采空区的探测,取得了很好的效果。探测结果表明,未采空和部分充填的老窑采空区表现为高视电阻率异常,而采空区则表现为低视电阻率异常。需注意的是在地面堆积的大量建筑垃圾及正在使用的建筑物给电法勘探工作的大线铺设、电极接地等施工带来了极大的困难。测试数据在第四系风积砂覆盖的干燥黄沙,会造成浅层形成一高阻率层,会对下部地层形成高阻屏蔽影响,造成剖面深部数据出现假象。

The high-density electrical method has been widely used in the detection of coal goaf. As the properties of goaf filling are different, it results that the performance characteristics in the data section of the high density electrical method are distinctive too. The paper mainly introduces the case that detected with the high-density electrical method in the aged coal goaf. Detection of the Linxin aged pita by using the Wenner device of high-density electrical method has achieved a good effect. According to the survey result,work outside the section and the partial filled aged pita goaf showed in a high apparent resistivity anomaly, and the goaf is shown as the low apparent resistivity anomaly. It must be noted that a large number of construction waste on the ground and buildings being used have caused a great difficulties on the the grounded electrode and some other excution of electrical prospecting work. The test data that expressed in the dry sand of the Quaternary wind will take shape of a high resistivity layer on the shallow layer,form a high resistance shielding effect on the lower formation and cause the deep data of profile coming with a kind of illusion.