黔北煤田灰岩含水层对开采13号煤层的影响研究  

Study on the influence of limestone aquifer on the mining No.13 coal seam in Qianbei coalfield

作　　者：李回贵 苏德国 孙维 许国胜 王军 LI Huigui;SU Deguo;SUN Wei;XU Guosheng;WANG Jun(College of Mining Engineering,Guizhou University of Engineering Science,Bijie 551700,China;CCTEG Chongqing Research Institute,Chongqing 400039,China;School of Energy and Mining,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]贵州工程应用技术学院矿业工程学院,贵州毕节551700 [2]中煤科工集团重庆研究院有限公司,重庆400039 [3]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《矿业安全与环保》2023年第6期130-135,共6页Mining Safety & Environmental Protection

基　　金：贵州省科技计划项目(黔科合基础-ZK[2023]一般124);毕节市科学技术项目(毕科联合[2023]11);贵州省高等学校西南喀斯特地区矿井水害创新团队项目(黔教技[2023]092号);重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0972)。

摘　　要：黔北煤田金沙片区9号煤层为突出煤层,为了解放该突出煤层,需要将13号煤层作为9号煤层的保护层先行开采,但是金沙片区13号煤层距离底板茅口灰岩含水层较近,开采13号煤层存在突水危险。以金沙片区为研究对象,统计分析38个钻孔的岩性、隔水层厚度和茅口组灰岩顶界标高数据发现,13号煤层底板隔水层岩性中隔水性较好的岩层共有9种,岩层累计厚度占隔水层厚度的43.51%~100.00%,平均为75.56%;隔水层岩性上下岩层相对较软、中间岩层相对较硬,隔水性能较好。13号煤层底板隔水层厚度为13.53~35.15 m,平均值为19.48 m;茅口组灰岩含水层水头值为1.35~5.57 MPa,平均值为3.33 MPa;掘进工作面隔水层厚度能够满足要求;13号煤层工作面回采时,97.38%区域处于危险区域,在未采取防治水措施之前,建议暂时不开采。研究结果可以为黔北金沙片区开采13号煤层和底板水害防治提供参考。No.9 coal seam in Jinsha area of Qianbei coalfield is an outburst coal seam.In order to liberate the outburst coal seam,it is necessary to first mine No.13 coal seam as the liberated layer of No.9 coal seam.However,No.13 coal seam in Jinsha area is close to the Maokou limestone aquifer in the floor,and there is a danger of water bursting in mining No.13 coal seam.Taking a research area in Jinsha area as the research object,the data of lithology,thickness of aquifuge and top boundary height of limestone in Maokou Formation of 38 boreholes were analyzed statistically.It is found that there are 9 kinds of rock strata with good water resisting property in the lithology of the aquifuge in the floor of No.13 coal seam,and the cumulative thickness of the strata accounts for 43.51%to 100.00%of the thickness of the aquifuge,with an average of 75.56%.The lithology of the aquifuge has the characteristics that the upper and lower layers are relatively soft,the middle layers are relatively hard,and the water resisting performance is good.The thickness of the aquifuge in the floor of No.13 coal seam ranges from 13.53 m to 35.15 m,with an average of 19.48 m.The water head value of the Maokou Formation limestone aquifer ranges from 1.35 MPa to 5.57 MPa,with an average of 3.33 MPa.The thickness of aquifuge of driving working face can meet the requirements.During the mining of No.13 coal working face,97.38%of the area is in a dangerous area.It is recommended not to be mined until water control measures are taken.The research results can provide reference for the prevention and control of water damage of No.13 coal seam and floor in Jinsha area in Qianbei.

关 键 词：黔北煤田 底板水害 隔水层 茅口灰岩含水层 突水系数 

分 类 号：TD745[矿业工程—矿井通风与安全]