摘要
呼吉尔特矿区属于鄂尔多斯盆地侏罗系煤田深埋区,可采煤层上覆较强富水性厚层砂岩含水层。随着煤层开采,顶板水进入矿井,严重影响矿井安全生产。矿区范围内,各生产矿井涌水量均较大,最大矿井涌水量达到2289 m 3/h,且仍呈上升趋势。针对这一情况,以该矿区涌水量最大的某矿井为例,对该矿区矿井涌水量变化规律和影响因素,从开采煤层上覆含水层赋存特征、巷道掘进长度、采空区半径、含水层疏降等方面,做了分析研究。结果表明:该矿区煤层顶板导水裂缝带范围内,发育有2~3层砂岩含水层,富水性差异较大,不同程度地影响矿井涌水量。在建井阶段,矿井涌水量随着巷道进尺的增加而增大,而矿井单位进尺涌水量和巷道单位进尺涌水量呈减小趋势。采前对工作面上覆含水层静储量进行计算,采取超前预疏放措施,充分疏放含水层静储量,可达到安全回采条件。矿井生产建设过程中,矿井涌水量先期呈大幅度增大的趋势,随着矿井采空区面积的不断增大,疏放影响范围增大,矿井涌水量增长幅度趋缓。
Huji Erte Mining Area belonged to the deep underground area of the Jurassic Coalfield in Ordos Basin.Above the mineable seam,there was a high watery aquifer in the thick sandstone.With the mining operation of the seam,the roof water came into the mine and was seriously affected to the mine safety production.Within the mining area,the mine inflow in each mine was all high,a max mine inflow was 2289 m 3/h and mine water inflow was in an increasing tendency.According to the condition,based on a mine with a max mine water inflow taken as a case,an analysis study was conducted on the variation law and influence factors of the mine water inflow in the mining area from the aquifer occurrence characteristics above the mining seam,the driving length of the gateway,the radius of the goaf,the dewatering of the aquifer and other aspects.The results showed that within the water flowing cracking zone scope in the seam roof of the mining area,there ware two to three sandstone aquifers developed,the watery difference was large and was affected to the mine water inflow in deferent degree.In the mine construction period,the mine water inflow would be increased with the gateway driving footage increased and the mine water inflow of the mine unit heading footage and the water inflow of the gateway unit driving would be in a reduced tendency.Before the mining operation,a calculation was conducted on the static water reserves of the aquifer above the coal mining face.Advance pre drainage measures were conducted,the static water reserves of the aquifer were fully drained and were reached to the safety mining condition.During the mine production construction processing,the initial mine water inflow was in a high increased tendency.With the area of the mine goaf continuously increased,the water drainage influence scope was increased and the increasing of the mine water inflow was in a stable tendency.
作者
覃意新
QIN Yixin(Zhongtian Hechuang Energy Company Limited,Ordos 017000,China)
出处
《建井技术》
2019年第6期29-34,共6页
Mine Construction Technology
关键词
呼吉尔特矿区
矿井涌水量
变化规律
砂岩含水层
预疏放
Huji Erte Mining Area
mine water inflow
variation law
aquifer in sandstone
pre drainage
作者简介
覃意新(1991—),男,内蒙古鄂尔多斯人,助理工程师。Tel:19847303650,E-mail:972229275@qq.com。
