煤层风氧化带边界控制及其富水性探测方法研究

针对国家能源集团宁夏煤业有限责任公司金家渠煤矿在勘探阶段煤层风氧化带确定范围与实际揭露位置存在的偏差,技术人员重新勘定煤层风氧化带边界,增加开采煤炭资源,减少资源损失,合理布置工作面,提前采用定向钻探与取芯化验法对4煤层风氧化带下边界进行探测,并结合3煤层风氧化带实际揭露资料推测其分布范围;在110401工作面回风巷掘进期间距4煤层风氧化带下边界最近范围896~1290m区域采用物探与钻探相结合的方法查清其位置变化,确定4煤层风氧化带下边界距110401工作面回风巷间距至少30m,且两者相互验证,查明了其富水情况,保证该巷道安全掘进。

Study on Boundary Control and Water-rich Detection Method of the Weathering Oxidation Zone in Coal Seam

In view of the deviation between the determined range of weathering oxidation zone in coal seam and the actual exposed position in Jinjiaqu Coal Mine of CHN Energy Ningxia Coal Industry Co.,Ltd.,the technical personnel have re-demarcated the boundary of the weathering oxidation zone in coal seam by adopting directional drilling and coring test method to detect the lower boundary of weathering oxidation zone in No.4 coal seam in advance and combining the actual exposed data of the weathering oxidation zone in No.3 coal seam to infer the distribution range in order to increase the coal mining resources,reduce the loss of resources,and reasonably arrange the working face.Both geophysical exploration and drilling have been adopted to detect the change of location in the area of 896~1290 m nearest to the lower boundary of the weathering oxidation zone of No.4 coal seam during the tunneling of the return airway of No.110401 working face.The distance between the lower boundary of weathering oxidation zone of No.4 coal seam and the return airway of No.110401 working face is determined to be at least 30 m.Both of the above have been mutually verified to ascertain the water-rich condition so as to ensure the safe tunneling of the roadway.