工作面复杂构造坑透及反射槽波透明化探测研究

煤矿井下工作面内部发育的复杂地质构造是威胁安全回采的重要因素,为保证工作面安全回采,提高探测精度,达到透明化探测目的,采用坑透和反射槽波两种物探手段相结合对工作面进行了探测研究。首先讨论了坑透和反射槽波的相关理论,分析了电磁波收敛成像算法和弹性波偏移成像算法,研究了坑透场强衰减规律和衰减系数。然后,对反射槽波探测数据进行了滤波和散射压制处理,发现两种方法相结合明显提高了分辨率。最后在理论研究的基础上,对某矿8115工作面进行透明化探测,坑透探测结果圈定异常区分布范围,反射槽波探测结果定性确定异常体属性,圈定6处异常,后经矿方钻探验证,探测结果与实际揭露情况相吻合,达到了透明化探测效果。研究表明:采用坑透与反射槽波探测工作面内部发育的复杂构造可达到确定异常体性质的效果,精度得以提升,切实为工作面安全回采提供了可靠地质资料,推广价值高。

Study on Transparency Detection by Mine Perspection and Reflection In-seam Wave in Complex Structure of Working Face

The complex geological structure developed in the underground coal mine working face is an important factor threatening the safety of mining.In order to ensure the safety of mining face,improve the detection accuracy,and achieve the purpose of transparent detection,in this paper,two geophysical prospecting methods,pit penetration and reflection trough wave,are combined to detect the working face.Based on the theory of pit penetrating and reflection groove wave,the convergence imaging algorithm of electromagnetic wave and the migration imaging algorithm of elastic wave are analyzed,the attenuation law and attenuation coefficient of pit penetrating field strength are studied,and the detection data of reflection groove wave are filtered and scattering suppressed.The combination of the two methods obviously improves the resolution.On the basis of theoretical research,the transparent detection is carried out on No.8115 working face of a mine.The distribution range of the abnormal area is delineated by the results of the penetration detection,and the attributes of the abnormal body are determined qualitatively by the reflected trough wave detection results,six anomalies are delineated.After the verification of the drilling by the mine side,the detection results are consistent with the actual disclosure,and the transparent detection effect is achieved.The research shows that the detection of complex structure in the working face by pit penetration and reflection wave can achieve the effect of determining the nature of abnormal body,improve the accuracy,and effectively provide reliable geological data for safe mining in the working face,with high promotion value.