基于多含水层放水试验的顶板水可疏降性评价
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摘要
为了对巷道掘进和工作面回采分别制定有针对性的防治水方案,通过对工作面顶板Ⅱ含水层和Ⅲ含水层分别开展放水试验,利用解析法计算了各含水层的水文地质参数,结合放水试验观测资料查明了Ⅱ含水层和Ⅲ含水层之间的水力联系,评价了各含水层的可疏降性。结果表明:威胁巷道掘进的Ⅲ含水层渗透性和富水性较强,同时与Ⅱ含水层的水力联系密切,巷道掘进期间Ⅲ含水层的可疏降性较差,可以采用对Ⅲ含水层注浆改造和局部疏水降压的防治水方案;与抽水试验相比,根据放水试验计算Ⅱ含水层的渗透系数较大,主要是由于钻探工艺、水跃和井损的影响,工作面在回采前可以对Ⅱ含水层采取长时间分散疏放和短时间集中疏放的防治水方案。对于顶板赋存多含水层的情况,可以利用放水试验探查工作面水害条件,评价各含水层的可疏降性,进而制定相应的防治水方案。
In order to formulate water disaster prevention and control project for roadway drivage and working face mining,through the dewatering test of Ⅱ aquifer and Ⅲ aquifer on the roof,the hydrogeology parameters of each aquifer are calculated based on analytical method. Combined with observation data of dewatering test, the hydraulic connection between Ⅱ aquifer and Ⅲ aquifer is ascertain,and the drainage feasibility of each aquifer is evaluated. The results show that permeability and water-bearing of Ⅲ aquifer were good,and there is a close hydraulic connection between Ⅱ aquifer and Ⅲ aquifer. The drainage fesibility of Ⅲ aquifer is poor during roadway drivage,the grouting transformation of roof aquifer and local drainage groundwater can be used to prevent and control water disaster. Compared with the pumping test,the permeability coefficient of Ⅱaquifer is bigger based on dewatering test,this result is mainly due to the drilling process,the influence of hydraulic jump and well loss. Long time dispersing drainage and short time concentrated drainage can be used before working face mining. In the case of multi-aquifer on the roof of coal seam,dewatering test can be used to explorate the condition of water disaster of working face,then,drainage feasibility is evaluated,and corresponding water disaster prevention method is formulated.
In order to formulate water disaster prevention and control project for roadway drivage and working face mining,through the dewatering test of Ⅱ aquifer and Ⅲ aquifer on the roof,the hydrogeology parameters of each aquifer are calculated based on analytical method. Combined with observation data of dewatering test, the hydraulic connection between Ⅱ aquifer and Ⅲ aquifer is ascertain,and the drainage feasibility of each aquifer is evaluated. The results show that permeability and water-bearing of Ⅲ aquifer were good,and there is a close hydraulic connection between Ⅱ aquifer and Ⅲ aquifer. The drainage fesibility of Ⅲ aquifer is poor during roadway drivage,the grouting transformation of roof aquifer and local drainage groundwater can be used to prevent and control water disaster. Compared with the pumping test,the permeability coefficient of Ⅱaquifer is bigger based on dewatering test,this result is mainly due to the drilling process,the influence of hydraulic jump and well loss. Long time dispersing drainage and short time concentrated drainage can be used before working face mining. In the case of multi-aquifer on the roof of coal seam,dewatering test can be used to explorate the condition of water disaster of working face,then,drainage feasibility is evaluated,and corresponding water disaster prevention method is formulated.
引文
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[2]翟晓荣,吴基文,韩东亚.补给边界群孔放水试验的含水层参数计算[J].中国矿业大学学报,2014,43(5):837-840,863.
[3]王皓,杜剑卿,李竞生.煤矿区放水试验中示踪剂的运移规律[J].煤田地质与勘探,2010,38(5):28-33.
[4]窦仲四,翟晓荣,张红梅,等.桃园煤矿Ⅱ4采区太原组灰岩含水层放水试验及其可疏放性评价[J].矿业安全与环保,2016,43(5):74-77.
[5]王赫生,李燕,龚健师,等.基于大型放水试验的矿区流场演化规律模拟研究[J].煤炭工程,2012,44(12):105-108.
[6]谢绍颖,李承军,魏大勇.恒源煤矿深部开采放水试验及防治水方案[J].煤矿安全,2010(10):54-56.
[7]张洪云,李健林,冯有利,等.煤矿深部采区底板含水层放水试验[J].煤矿安全,2012(8):30-32,36.
[8]田广,王晓波.东滩煤矿奥灰放水试验数值模拟[J].煤田地质与勘探,2014,42(3):61-64.
[9]虎维岳,田干.我国煤矿水害类型及其防治对策[J].煤炭科学技术,2010,38(1):92-96.
[10]刘基.基于井下放水试验的渗透系数计算[J].矿业安全与环保,2015,42(2):76-79.
[11]邵红旗,曹祖宝,李建文,等.一种放水试验分析方法及其应用[J].水文地质工程地质,2014,41(2):7-12,43.
[12]王赫生,孙亚军,李燕.煤矿抽水试验及疏水设计参数的合理确定[J].煤炭工程,2011,43(4):13-15.
[13]崔思源,孙亚军,甄战战.“降深分配法”在反求水文地质参数中的应用[J].煤炭工程,2016,48(4):65-67.