论文部分内容阅读
针对王家山煤矿47407大倾角特厚煤层综放工作面矿压动力显现危险预测区域内两道爆破卸压后,在该区域回采期间工作面中段(圆弧段)出现高压力显现的问题,通过对两道爆破前后工作面的压力分布进行现场观测,并基于弹塑性岩体理论对采场上覆煤岩层建立模型,根据UDEC数值模拟分析结果,得出工作面中段(圆弧段)上方存在的爆破卸压盲区是造成“高应力传递区域”的直接原因。基于此,在下口向外15 m处起对工作面中段顶部煤岩体实施了倒“八”字孔爆破卸压后,成功对高应力传递区域进行解危,阻断了高应力传递路径,此后在工作面两道爆破卸压后的矿压动力显现预测区域回采期间中段压力显现问题消失,确保了安全生产。
Aiming at the problem of high pressure appearing in the middle section (circular arc section) of working face during the mining in this area after the two blasting pressure relief in the pressure dynamic revealing of fully mechanized caving mining face in the 47407 coal seam fully mechanized caving mining face with high inclined angle, The pressure distributions of working face before and after two blasting were observed on site. Based on the elasto-plastic rock mass theory, a model was established for coal overburden stope. Based on the UDEC numerical simulation results, it was found that there existed above the working face Blasting pressure relief blind spot is the direct cause of “high stress transfer area.” Based on this, the high stress transfer zone was successfully terminated and pressure relief was successfully blocked after the “top” coal seam at the top of the middle section of the working face was kicked off at a pressure of 15 m away from the mouth. After that, the pressure appeared in the mid-stage of the mining area in the predicted area after the two blasting relief pressure relief work surface disappeared to ensure the safe production.