School of Safety Science and Engineering, Henan Polytechnic University Henan Provincial Key Lab of Gas
Geology and Gas Control, Cultivation Base of Henan Province and MOE Joint National Key Lab, Henan Polytechnic
University

针对常规探测技术存在成本高、多解性、小断层探测精度低等问题,提出利用煤矿大量的瓦斯抽采钻孔开展隐伏小断层探测的方法,以穿层条带预抽煤层瓦斯区域为研究对象,基于抽采钻孔获取的数据,计算煤层底板控制点坐标,绘制预抽条带煤层底板等高线图及三维立体图,进而对煤层隐伏断层的具体位置、产状和落差做出定量预测。通过现场试验可知钻孔控制间距、断层落差和孔深误差对隐伏断层探测精度有影响,结果表明:断层落差越大,钻孔间距越小,孔深误差越小,则探测精度越高,通过该探测方法成功探测出了落差为2.5 m的断层。

According to a high ccst, ambiguity, low small fault detection accuracy and other problems existed in conventional detection technology, a method with m any gas drainage boreholes in coal mine was applied to detect the hidden small faults was conducted. Taking a mining strip through seam applied to pre- drainage the s eam gas region as the study object, based on the data from the gas drainage boreholes, the control point coordinates of the seam floor were calculated, the contour ma p and 3D map of the pre- drainage strip seam were drawn and then the quantitative predictions were conducted on the certain location, attitude and throw of the hidden small faults in coal seam. The site experiment was applied to investigate the spacing control of boreholes, fault throw and borehole depth error affected to the detection accuracy of the hidden faults. The results showed that the higher fault throw was, the smaller spacing between boreholes and the smaller error of the borehole depth W as, the higher detection accuracy would be. With the method, a fault throw of 2.5 m was successfully detected.

国家自然科学基金资助项目(41372160)；河南省基础与前沿研究资助项目(092300410211)；