门克庆井田水文地质条件对矿井开采顺序的影响

Effect of hydrogeological conditions on the mining sequence in Menkeqing Mine

门克庆矿井水文地质类型为"复杂型",矿井达产时,设计布置3-1煤1个工作面和2^(-2)中煤1个工作面,2层煤之间平均距离为34 m,2煤层回采过程中主要的充水含水层均为直罗组底部七里镇砂岩含水层。该含水层水压力大,达到4 MPa,疏放水钻孔单孔涌水量最大达到180 m^3/h,富水性相对较强,且距离2^(-2)中煤距离多小于5 m,导致2^(-2)中煤巷道掘进过程中出现顶板淋水严重,锚索锚固困难等现象,无法保障2^(-2)中煤的安全生产。笔者提出先开采下层3-1煤,待七里镇砂岩含水层水量、水压被疏降至可以保障2^(-2)中煤顺利掘进和生产时,再开采上层2^(-2)中煤的"反层序"采煤方法。生产实践证明,该方案是可行的。

The hydrogeological type of Menkeqing Mine is of complex type,when the production started,working face was designed and arranged respectively in seams 3-1 and 2-2.The average distance between two seams is 34 m.During extraction of both seams,the major water-filling aquifer was Qilizhen sandstone aquifer at the bottom of Zhiluoformation.The pressure of the aquifer was high,up to 4 MPa,the maximum water inflow of a single drainage hole reached 180 m3/h,the water abundance was relatively high,and the distance of the aquifer was m ostly less 5 m from seam 2-2,inducing serious water drops from the roof in during driving in coal roadway of seam 2-2 and difficulties for cable bolt,the safe production in seam 2-2 could not be ensured.The authors proposed a mining method with reverse sequence,that is,seam 3-1 was mined firstly,and when the water yield and pressure dropped enough to ensure smooth driving and extraction in seam 2-2,the upper seam 2-2 was mined.The mining practice demonstrated that the scheme was feasible.