露天采坑烧变岩与古冲沟区域水文地质“双探三预测”技术  

Hydrogeology“double exploration and three prediction”technology of burnt rock and ancient gully area in open-pit

作　　者：牟义 李健[1,2] 丰莉 王敏[4] 刘玉[5] 杜明泽 MU Yi;LI Jian;FENG Li;WANG Min;LIU Yu;DU Mingze(Mine Safety Technology Branch,China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute),Beijing 100013,China;College of Resources,Shandong University of Science and Technology,Taian 271000,China;Geological Survey Department,Jinneng Holding Coal Group,Datong 037000,China;Geophysical Research Institute,Exploration Unit of North China Geological Exploration Bureau,Sanhe 065201,China)

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013 [3]山东科技大学资源学院,山东泰安271000 [4]晋能控股煤业集团地质测量部,山西大同037000 [5]华北地质勘查局综合普查大队物探院,河北三河065201

出　　处：《中国矿业》2022年第3期149-157,共9页China Mining Magazine

基　　金：中国煤炭科工集团有限公司科技创新创业资金专项项目资助(编号:2019-2-ZD005,2019-ZD004)。

摘　　要：榆林市某露天矿首采区东端帮涌水区域位于烧变岩与古冲沟区域,水资源储量巨大,穿孔时涌水明显,给采坑剥离带来巨大安全隐患。为了保证采坑安全生产,对东端帮区域进行水文地质勘查工作,采用分区物探和钻探的“双探”技术进行水文地质条件勘探,结合钻孔抽水试验工作,进行渗透系数、单位涌水量及区域涌水量的“三预测”工作。结果表明:榆林市某露天矿首采区东端帮分区物探成果中古冲沟与烧变岩区域低阻异常范围最大,异常强度极强-强趋势,推断存在导水通道,将上部含水层和下部含水层连为一体,补给来源丰富,富水强度极强。对于烧变岩和古冲沟发育区域,烧变岩含水层呈现极高渗透系数高涌水量特征,表明下方烧变岩层连通性好,为强富水性等级;混合段呈现中渗透系数高涌水量特征,表明中间混合段岩层连通性一般,动水量较丰富,混合段也为强富水性等级。采用大井法以及集水廊道法对东端帮烧变岩区域和古冲沟发育区域206 m物探强富水区域涌水量进行预计,预计涌水量为6453.78 m^(3)/d。The water gushing area at the east end of the first mining area of an open-pit mine in Yulin City is located in the burnt rock and ancient gully area,the water resource reserves are huge,and the water gushing is obvious during the perforation,which brings huge potential safety hazard to the stripping of the mining pit.In order to ensure the safe production of the mining pit,the hydrogeological exploration work is carried out in the east end area.The“double exploration”technology of zonal geophysical exploration and drilling is used to explore the hydrogeological conditions.Combined with the drilling pumping test,the“three prediction”work of permeability coefficient,unit water inflow and regional water inflow is carried out.The results show that according to the geophysical exploration results of the east end of the first mining area of an open pit mine in Yulin City,the low resistance anomaly range of the ancient gully and burnt rock area is the largest,and the anomaly intensity show a very strong to strong trend,it is inferred that there is a water channel,which connects the upper aquifer with the lower aquifer,and the recharge source is rich,the water rich intensity is very strong.For the burnt rock and ancient gully development area,the burnt rock aquifer presents the characteristics of extremely high permeability and high water inflow,which indicates that the lower burnt rock has good connectivity and are of strong water abundance grade;the mixed section presents medium permeability coefficient and high water inflow,which indicates that the connectivity of rock strata in the middle mixed section is general,the water flow is rich,and the mixed section is also of strong water abundance grade.The large well method and water collecting Gallery method are used to predict the water inflow of the east end wall burnt rock area and the 206 m geophysical prospecting strong water rich area in the ancient gully development area,and the estimated water inflow is 6453.78 m^(3)/d.

关 键 词：瞬变电磁法 高密度电法 抽水试验 单位涌水量 渗透系数 涌水量预测 

分 类 号：TD166[矿业工程—矿山地质测量] P631.3[天文地球—地质矿产勘探]