掘进面瞬变电磁探测采空区及三维成像技术研究

3-D Imaging Technology and Goaf Transient Electromagnetic Exploration of Driving Face

为优化掘进工作面前方采空区的全空间瞬变电磁法探测技术,针对晋城矿区不含水、含水采空区条件分别展开二维视电阻率断面图成像分析研究,并对推断结果进行了钻探验证;在此基础上,将采空区进行三维立体精细化成像,根据视电阻率层位切片图及三维等值面图推演采空区的赋存状况;同时,结合实际条件利用裂缝带高度经验公式对三维成像推论加以计算验证。结果表明:全空间瞬变电磁能较为及时准确地对前方有效探测深度内存在的采空区做出响应;三维成像技术能有效结合常规二维成像分析,更直观立体地反映采空区及覆岩破坏情况,指导钻探验证工作的进行;同时,三维成像技术也为裂缝带高度的研究提供了新的直观方式。

In order to optimize space transient electromagnetic exploration technology of ahead goaf of driving face, 2-D visual electrical resistance tomography was studied under different water, aquifer goaf in Jincheng coal mine area, then the results verified by drilling hole. 3-D precision imaging of goaf was done, goaf was evaluated according visual electrical resistance tomography pictures and 3-D contour surface, at the same time 3-D imaging was verified by fracture zone height in practical. The results showed that space transient electromagnetic exploration could response for exiting goaf in exploration depth ahead in time and accurately, 3-D imaging technology could analyze with normal 2-D imaging technology, goaf and overburden broken could reflected directly, it could guided for drilling verification, at the same time, 3-D imaging technology provide directly method for fracture zone height studying.