摘要
西部矿区是我国重要的能源战略基地,侏罗纪煤田可采煤层多、资源储量丰富,中下组煤受"宝塔山砂岩"含水层严重威胁,但目前国内对该含水层研究较少、资料匮乏。以新上海一号煤矿"11·25"突水事故为例,采用延深排水钻孔、水文地质补充勘探、井下放水试验等手段,查明该含水层具有沉积结构复杂、富水性不均、静储量丰富、水头高、水压大、容易疏放等特点;通过安全隔水层厚度计算,说明"11·25"事故突水原因。SEM镜下显示砂岩为泥质胶结,块状结构,内生孔隙发育。以砂岩总厚度、砂地比、单位涌水量、渗透系数为主控因素,分析含水层富水性规律;预计正常情况下开采涌水量1 200.7 m3/h,最大涌水量1 860.84 m3/h,超出矿井排水能力。在水文地质单元边界条件分析的基础上,利用Visual MODFLOW建立非稳定渗流场三维数值模型,模拟4个放水阶段的解危效果,结果表明,历时215 d,放水量约487.6万m3,一分区18煤突水危险可以解除。
The western mining area is an important energy strategic base in China.The Jurassic coalfields have many mineable coal seams and rich resources.The middle and lower coal seams are seriously threatened by the"Baotashan sandstone" aquifer.However,the research on this aquifer is few and the data is scarce in China.Taking the "11·25" water inrush hazard of New Shanghai No.1 coal mine as an example,the extended drainage drilling,supplementary hydrogeological exploration and underground water drainage test were carried out.It was found that the aquifer was characterized by complex sedimentary structure,uneven water-rich,abundant static reserves,high water head,large water pressure and easy drainage.SEM showed that the sandstone is of argillaceous cementation,massive structure,and endogenous pore development.Taking the total thickness of sandstone,the ratio of sand to land,the unit water inflow and the permeability coefficient as the main controlling factors,the law of water-rich property of the aquifer was analyzed.It was estimated that under normal conditions,the water inflow is 1 200.7 m3/h and the maximum water inflow is 1 860.8 m3/h,which excess the capacity of mine drainage.Based on the analysis of the boundary conditions of hydrogeological units,a three-dimensional numerical model of unsteady seepage field was established by Visual MODFLOW,and the crisis-solving effects of four drainage stages were simulated,the danger of water inrush from 18 coal seam in one district could be relieved.
作者
吕玉广
刘宝开
赵宝峰
吕文卿
韩港
王永宝
LYU Yuguang;LIU Baokai;ZHAO Baofeng;LYU Wenqing;HAN Gang;WANG Yongbao(School of Resources and Earth Science,China University of Mining and Technology,Xuzhou 221116,China;Inner Mongolia Shanghai Temple Mining Co.Ltd.,Ordos 016299,China;Xi'an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi'an 710077,China;Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2020年第6期170-178,共9页
Coal Geology & Exploration
基金
国家自然科学基金项目(41807221)
鄂尔多斯市2019年度科技计划资助项目。
关键词
侏罗纪煤田
宝塔山砂岩
水文地质特征
放水试验
解危开采
Jurassic coalfield
Baotashan sandstone
hydrogeolagical characteristics
drainage test
crisis-relief mining
