芒硝矿地下溶蚀区综合地球物理勘查效果比较

由于芒硝矿区中被溶蚀的部分矿体与其顶、底板地层的地球物理响应存在物性异性,采用高密度电法、地质雷达和地震法等方法进行探测在理论上虽具有一定的可行性,但仍需根据实际情况,通过试验选择有效的地球物理方法.在实际工作中,发现目标体与围岩之间的电性差异小,采用常规的高密度电法无法进行精细探测;又由于受到矿山人文干扰严重,采用地质雷达电磁波反射法亦无法开展有效工作.采用地震折射波法对芒硝矿区内的溶蚀、塌陷区进行勘查,发现折射波层析成像的解释结果能够对测区内地层有较好的的分层,对芒硝矿中溶蚀、塌陷范围的划定具有极佳的效果.证明了在芒硝矿区地下溶蚀区探测中,地震折射波层析成像技术的有效性.

Comparison geophysical techniques for detecting underground dissolution area of glauber mine

In the Glauber salt area, some eroded ore bodies have different physical properties compare with their top and bottom strata. Theoretically, some conventional geophysical methods such as High density Electrical method, Ground Penetrating Seismic method can be used to detect this kind of special target. However, it also needs a effective method according to the facts. High Density Electrical Method cannot be used for high precision detection while small difference between the target body and surrounding rock. GPR is seriously affected by human disturbance and cannot carry out effective work. Refraction tomographic imaging method has a good stratified result on the corrosion and collapse areas in glauber mine. Moreover,this method also can delimit the scope of corrosion and collapse in glauber mine. So the seismic refraction tomography technology is effective in the underground karst area of glauber mine.