深部煤层超高水充填开采采动控制效果研究

Study on Mining Control Effect of Superhigh Water Backfilling Mining in Deep Coal Seam

深部煤层开采时,"三高一扰动"的赋存环境易导致地表塌陷、矿压显现剧烈,引发冲击地压等采动灾害,影响地面建筑物安全及矿区生态环境。为解决深部煤层开采时出现的采动损害,采用超高水充填开采技术进行治理,通过数值模拟和现场试验对超高水充填开采采动控制效果进行研究。结果表明:与垮落法开采相比,超高水充填开采充填率越高,采动损害控制效果越好。当充填率达到90%时,地表累计最大下沉量为0.198 m,液压支架来压时最大工作阻力为35.1 MPa,平均周期来压步距为35.6 m,煤层中积聚能量最大为6456.54 J。深部煤层超高水充填开采时地表减沉效果明显,来压时矿山压力显著减小,来压步距显著增长,冲击地压预防效果良好。

During deep coal seam mining,the occurrence environment of"three highs and one disturbance"is easy to lead to surface collapse and severe mine pressure behavior,which may cause rock burst and other mining disasters,affecting the safety of ground buildings and the ecological environment of the mining area.In order to solve the mining damage in deep coal seam mining,the ultra-high water filling mining technology was adopted for treatment,and its control effect was studied through numerical simulation and field test.The results show that,compared with caving mining,the higher the filling rate,the better the control effect of mining damage.When the filling rate reaches 90%,the accumulated maximum surface subsidence is 0.198 m,the maximum working resistance of hydraulic support is 35.1 MPa,the average periodic weighting step is 35.6 m,and the maximum accumulated energy in coal seam is 6456.54 J.Thus,during deep coal seam mining by ultra-high water filling mining technology,the effect of surface subsidence reduction is obvious,the mine pressure is significantly reduced,the weighting step is significantly increased,and the prevention effect of rock burst is good.