摘要
煤层多为致密沉积物,一般视其为隔水层,近年来,我国陕北侏罗纪煤田榆横北区内发现的富水煤层问题较为突出。为解除榆横北区富水煤层岩巷上山掘进揭露2号煤层的水害隐患,以巴拉素煤矿为例,采用"物探先行、钻探后进"的原则,结合动态监测、水化学分析、钻孔窥视等多种综合手段,在岩层巷道掘进过程中,确保揭露煤层的安全。结果表明:通过物探工程发现了巷道掘进前方2号煤层存在富水异常区,钻探工程疏放水效果显著,应用水化学分析确定了煤层水质类型为SO_(4)^(2-)-Na·(Ca)型水、总矿化度在6 000mg/L左右,结合孔内窥视,发现煤层内部的裂隙发育、水体联通,由此认为本区内2号煤层水体具有赋存范围大、补给条件差、水力联系好、静储量为主的特点,其长期处于封闭状态,有利于矿井疏放水工作的高效开展。结合本次安全揭煤经验,以期为矿井巷道掘进揭煤提供借鉴和思路。
Coal seams are mostly dense sediments,which are generally regarded as aquiclude.In recent years,the problem of water rich coal seams found in Yuhengbei area of Jurassic coalfield in northern Shaanxi is more prominent.In order to solve the hidden danger of No.2 water-rich coal seam water hazards during the rock roadway uphill tunneling in northern Yuheng mining area,taking Balasu coal mine as an example,the principle of“geophysical exploration first,drilling later”and the comprehensive means of dynamic monitoring,hydrochemical analysis,borehole peeping are employed in the process of rock roadway tunneling to ensure the safety of uncovering coal.The abnormal water-rich area in No.2 coal seam ahead of roadway tunneling is found through the geophysical exploration,and then the significant drainage effect of drilling engineering is proved.Based on that,the coal seam water quality type is confirmed as SO_(4)^(2-)-Na·(Ca),and the total salinity is confirmed as around 6000 mg/L through the hydrochemical analysis.Peaking through the drilling,the cracks developed in the coal seam and the connected water are revealed.Thus,the main characteristics of the No.2 coal seam water in this area are large occurrence range,poor supply conditions,good hydraulic connection and mainly static reserves.The long-time closed state is conducive to the development of mine drainage work.The safety experience of uncovering coal can be used for reference in later mining roadway uncovering coal.
作者
王春林
刘洋
方刚
李彦民
梁向阳
刘晨光
杨彦宁
闫永乐
WANG Chunlin;LIU Yang;FANG Gang;LI Yanmin;LIANG Xiangyang;LIU Chenguang;YANG Yanning;YAN Yongle(Balasu Coal Industry Co.,Ltd.,Shaanxi Yanchang Petroleum Group,Yulin 719000,China;China Coal Technology&Engineering Group Xi an Research Institute,Xi'an 710054,China;Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard,Xi'an 710077,China;College of Geology and Environment,Xi an University of Science and Technology,Xi'an 710054,China)
出处
《中国矿业》
2021年第5期214-219,共6页
China Mining Magazine
基金
中煤科工集团西安研究院科技创新基金资助项目资助(编号:2020XAYJS05)
国家重点研发计划资助项目资助(编号:2017YFC0804100)
国家自然科学基金资助项目资助(编号:41807221)。
关键词
巴拉素煤矿
富水煤层
岩巷掘进
揭露煤层
矿井防治水
Balasu coal mine
water-rich coal seam
rock roadway tunneling
coal seam uncovering
mine water prevention and control
