大倾角松软煤层炮采工作面矿压显现规律研究

Study on Strata-pressure Behavior in Blasting Face of Soft Seams with Large Inclined Angle

工作面围岩压力分布及顶板活动规律是安全管理和合理安排生产的关键因素。采用数值模拟、相似材料模拟、现场实测综合方法获得了大倾角松软煤层炮采长壁工作面围岩压力分布及矿压显现规律。结果表明:大倾角松软煤层炮采长壁工作面老顶初次来压步距20 m,周期来压步距为15m,在工作面顶板支护设计中应重视周期来压的支柱安全;工作面围岩变形具有近场效应,在临近工作面附近变形剧烈,平巷支护设计理念应从载荷控制向变形控制转变。

The surrounding rock pressure distribution and roof movement laws are the key tactors to manage safely production and arrange rationally production. The strata - pressure behavior in blastine face of soft seams with large inclined angle can be gotten by the synthesis method of numerical simulation, similar material simulation and field measurement. The results show that the first weighting interval of main roof is 20 m, and the periodie weighting interval is 15 m. Attention should be paid to the support safety in the periodic weighting interval while designing roof support of working face, There is near - field effect in the surrounding rock deformarion of the working face and it is deformed greatly near the face. Drift support design idea should change from load control to deformation control.