呼吉尔特矿区深埋煤层顶板“七里镇砂岩”富水特征研究

Study on Deep Coal Roof Qilizhen Sandstone Aquifer Water Yield Property in Hogirt Mining Area

为了查清呼吉尔特矿区深埋煤层顶板“七里镇砂岩”直接充水含水层富水特征,在确定地质结构特征和关键含水层空间展布的基础上,研究了不同尺度(工作面、单个矿井、煤矿群)下涌水演化和水位变化规律。结果表明:研究区顶板疏放水钻孔涌水量具“两侧小、中间大”的特点,顶板疏放水钻孔涌水量与“七里镇砂岩”厚度对应性较好,显示“七里镇砂岩”含水层是该地区煤层顶板最主要的直接充水含水层。对煤层顶板直接充水含水层进行大型煤矿群(近4000万t产能)超大型疏放水,矿区涌水量随着井下采掘活动强度的增加而持续增加,2018年已达到7029.75 m^(3)/h,且未出现稳定或衰减现象,表明“七里镇砂岩”动态补给较好;这个过程中“七里镇砂岩”含水层水位下降明显,白垩系水位则基本不变,表明浅部含水层与深部含水层之间水力联系较差,“七里镇砂岩”以侧向补给为主。综上,呼吉尔特矿区煤层顶板“七里镇砂岩”具有水量大、水压高、富水性不均一、补给好的特点。

To identify deep coal roof Qilizhen sandstone immediate water filling aquifer water yield property in the Hogirt mining area,on the basis of key aquifer spatial extension and geological structure features,water inrush evolution and water level variation pattern under different sized working face,individual coalmine or coalmine group are studied.The results have shown that the water flows of roof dewatering and drainage boreholes have present“small both sides and large center”features.Correspondence between roof dewatering and drainage boreholes water flow and thickness of Qilizhen sandstone has indicated the sandstone aquifer is the most important coal roof immediate water filling aquifer in the area.To carry out large coalmine group(near 40 million tons capacity)extra large dewatering and drainage for the aquifer,mine area water inflow will sustained increase with increasing of underground winning and opening activities intensity,in 2018 has already achieved 7029.75m^(3)/h and without stabilized or attenuated phenomena,indicated the aquifer has better dynamic recharge.During the process,the Qilizhen sandstone aquifer water level has obviously went down,but Cretaceous water level basically invariant indicated weaker hydraulic connection between shallow and deep aquifers,and Qilizhen sandstone aquifer mainly lateral recharge.The comprehensive analysis has shown that Qilizhen sandstone aquifer has features of large water flow,high water pressure,inhomogeneous water yield property and excellent recharge.