基于TEM的井下铁矿采空区探测评价

针对铁矿井下采空区探测技术难题,以瞬变电磁法(TEM)理论为依据,采用TerraTEM对井下铁矿不同采矿中段、不同长度的穿脉进行空区探测评价,部分穿脉结合HDRM进行对比验证,并在部分穿脉实施了工程揭露.结果表明,采用合适的采集参数和探测装置的TEM能准确查明井下铁矿中浅层采空区分布情况.且TEM具有更高的对不同介质的电性区分能力,更准确地显示异常体的埋深和规模,不存在传统物探的探测盲区,其探测距离长短不受限制,可进行定点深度范围内的电性差异探测,以查清采掘巷道下方一定深度范围内的采空区和疑似冒落区,保障井下铁矿日常生产安全.

Detection and Evaluation of Underground Iron Ore Goaf Based on TEM

For the detection technology problems of underground iron ore goaf,the tunnels of different mining middle and length are detected and evaluated in the goaf by TerraTEM on the basis of the transient electromagnetic method(TEM).Several contrast tunnels are tested and verified by combining HDRM.Meanwhile geological projects are put into effect for some tunnels.It is found that the distribution of the superficial layer goaf in underground iron ore is to be ascertained through TEM with appropriate collect parameters and detection devices.The TEM can distinguish the electrical property of different media better and display the burial depth and scale of abnormal body more accurately.Moreover,there is no detection dead zone which exists in the traditional geophysical prospecting methods,and the detection distance and length are not restricted.Therefore,it can detect the electrical property difference in a fixed point depth range,provide a thorough investigation of the goaf and suspect collapse areas of a certain depth below the mining tunnels.It is important for the safety assurance of underground iron ore mine production.