侏罗系浅埋巨厚含水层疏放水效果安全评价

Safety Evaluation on Drainage Effect of Jurassic Shallow-buried Giantthick Aquifer

本文以国家能源集团宁夏煤业有限责任公司金家渠煤矿首采110301工作面煤层顶板巨厚含水层作为重点研究对象,通过对工作面充水水源分析,计算其静储量与动储量。采用钻探方法在工作面回采前对含水层进行疏放,将钻孔疏放涌水量总体趋于稳定时,疏放总涌水量大于静储量,钻孔稳定量小于动储量,并结合周边矿井单孔压力值定位为0.5 MPa以下作为疏放效果安全评价的标准。采用对含水层水量预测与疏放水资料收集与综合分析的研究方法,可推广至类似地质及水文地质条件工作面,工作面有效疏放工期为18个月,达到安全回采要求,使工作面回采提前3个月,实现了一定的经济效益。

This article takes the giant-thick aquifer on the coal seam roof in the first working face 110301 of Jinjiaqu Coal Mine of CHN Energy Ningxia Coal Industry Co.,Ltd.as the key research object.The water filling source of the working face has been analyzed for calculating static and dynamic reserves.Drilling methods have been adopted to drain the aquifer before stoping on the working face.When the water inflow drained through boreholes tends to be stable,the total water inflow drained is greater than the static re⁃serve,and the stable water inflow in boreholes is less than the dynamic reserve.With the conditions of sur⁃rounding mines taken into account,the pressure value of single borehole is set to be lower than 0.5 MPa for safety evaluation of the drainage effect.The research method integrating water yield prediction of the aqui⁃fer,drainage data collection and comprehensive analysis can be generalized to working faces with similar geo⁃logical and hydrogeological conditions.The effective drainage period of the working face is 18 months,which meets the requirements for safe stoping,and makes the stoping of the working face 3 months ahead of schedule,creating certain economic benefits.