摘要
为克服传统的单孔单位涌水量法在评价煤矿床含水层富水性存在的不足,用抽(放)水试验非稳定流观测数据来定量评价含水层的富水性,利用含水层瓶颈效应发生机理和非稳定流原理来分析研究,通过单孔非稳定流法、多孔法、群孔抽水试验法等3种方法,研究了消除瓶颈效应影响下,地下水存在绕流时,导水系数、含水层贮水系数的求算方法。实例应用结果表明:不同距离观测孔在水头降速均为0.46 m/h时,导水系数为0.20 m^2/h是唯一值,在时滞为1.52 h时贮水系数为1.5×10^(-5),用非稳定流方法可消除瓶颈效应和绕流影响因素,且计算的含水层参数结果可靠,选择合理的现场勘探测试方法是准确评价计算含水层参数的前提。
In order to overcome the disadvantage of conventional single-hole unit water inflow method applied to evaluate on water abundance of aquifer in coal deposits,the observation data of unsteady flow from water drainage test was applied to quantitative evaluation on water abundance of aquifer.An analysis study was conducted with the bottleneck effect occurred mechanism and the unsteady flow principle of aquifer and three methods of single-hole unsteady flow method,multiple hole method and group-hole water drainage test method were applied to study hydraulic conductivity under the elimination of bottleneck effect influence and underground water with circumfluence and solution algorithm of water storage coefficient for time delay aquifer.The case study results showed that under the different distance observation hole,when precipitation rate of water head was 0.46 m/h,the hydraulic conductivity coefficient with a value of 0.20 m^2/h would be the unique value.When time delay was 1.52 h,the water storage coefficient would be 1.5×10^（-5）.The unsteady flow method could be applied to eliminate bottleneck and circumfluence factors.The calculated parameter results of aquifer were reliable and the selected rational site survey test method approved was prerequisite to accurately evaluate and calculate aquifer parameters.
出处
《煤炭科学技术》
CAS
北大核心
2017年第2期168-172,共5页
Coal Science and Technology
关键词
含水层
富水性
定量评价
时滞
非稳定流
aquifer
water abundance
quantitative evaluation
time delay
unsteady flow
