综合物探方法在采空区探测中的应用

Application of Integrated Geophysical Prospecting Method in Goaf Detection

东源县仙塘镇一带的萤石矿老采空区对当地人居环境产生了一定威胁,已出现部分塌陷区,但其分布范围零散、复杂,规模较小,资料记载不全,探测难度大。为了能有效查明采空区的大致范围,提出采用高密度电法、微动勘探和EH-4电磁测深相结合的综合探测方法。通过处理后的视速度和电阻率剖面,结合实际情况,圈出异常区。高密度电法在浅部未发现异常,EH-4电磁测深和微动勘探在相同深度范围内发现异常。通过钻探对异常进行验证,在异常区钻探验证发现采空区,结果表明本次选用的综合探测方法可以有效探测采空区。

The abandoned fluorite mine in Xiantang Town of Dongyuan County poses a certain threat to the local human settlement environment,with scattered and complex subsiding areas.The distribution range is small in scale,data records are incomplete,and detection is difficult.In order to find out the rough scope of goaf effectively,proposes a comprehensive detection method which combines high density electrical method,micro-tremor exploration and EH4 electromagnetic sounding.Through the processed apparent velocity and resistivity profile,the abnormal area is circled according to the actual situation.The high-density electrical method found no anomalies in shallow areas,while EH4 electromagnetic sounding and micro-tremor prospecting found anomalies in the same depth range.The goaf is found in the abnormal drilling verification area,and the results show that the comprehensive detection method selected this time can effectively detect goaf.