伊犁矿区覆岩“两带”发育特征及对工作面涌水的影响研究

Development characteristics of “two zones” of overburden in Yili mining area and its influence on water inrush of working face

伊犁矿区煤层埋深浅、距含水层近,基岩薄且软弱,工作面涌水成为制约矿井安全生产的重要难题。为此,通过理论分析和现场实测的方法对伊犁矿区覆岩运移特征以及对工作面涌水量的影响规律进行了研究。研究结果表明:工作面采空区上部仅存在"两带",无形成弯曲下沉带的覆岩条件,工作面推进速度慢会给覆岩采动裂隙充分的发育时间,"两带"发育高度大,与含水层沟通导致工作面涌水量大;加快工作面推进速度,全部软弱覆岩会随采随冒,地表出现整体性、规律性沉陷,为充分发育的"两带"被快速压实,弥合裂隙导水通道,减少工作面涌水。研究结果为矿井安全开采提供重要依据。

In Yili mining area,the coal seam is shallow,close to the aquifer,and the bedrock is thin and weak.Water inrush from the working face has become a restriction against safe production of the mine.Therefore,the characteristics of overburden migration and the influence of water inflow on the working face are studied by theoretical analysis and field measurement.The results show that there are only"two zones"in the upper part of the goaf,and there is no overburden condition to form the bending subsidence zone.The slow advancing speed of the working face will give the overburden full development time of mining fissures,and the high developing height of the two zones will lead to the large water inflow of the working face due to the communication with the aquifer;when the working face advancement is accelerated,all the weak overburden caves with the mining disturbance,and leads to integral and regular subsidence,which rapidly compacts the underdeveloped"two zones",and close the water channel of the fracture to reduce water inflow in the working face.