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为了解复杂构造情况下开采急倾斜煤层对周围岩体的影响,使用基于颗粒流的PFC3D对开采过程进行了模拟。该煤层赋存于向斜左翼,同时岩体也有水平方向裂隙,且煤层倾角为87°。开采方案分11个周期,开采的模拟深度为240 m。分析了开挖过程中岩体破坏的特点,提出了可能的治理措施。模拟结果表明:40 m宽采空区右侧岩体最稳定;左侧岩体向左倾倒后向右弯曲。30 m宽采空区左侧岩体较稳定;右侧岩体破坏最严重。两采空区中部岩体向左倾倒,导致该部分地表明显沉降。可对30 m宽煤层开采前加固煤层右侧岩体,或对岩体施加水平约束;而40 m宽煤层右侧岩体可以不进行加固。
In order to understand the influence of the steep coal seam mining on the surrounding rock mass under complex structure, the mining process was simulated by PFC3D based on particle flow. The coal seams occur in the left wing of the syncline. At the same time, the rock mass also has horizontal cracks, and the coal seam dip angle is 87 °. Mining program is divided into 11 cycles, mining simulation depth of 240 m. The characteristics of rock mass destruction during excavation are analyzed, and possible control measures are put forward. The simulation results show that the rock mass on the right side of the 40 m wide goaf is the most stable, and the rock mass on the left is bent to the left and then bent to the right. The rock mass on the left side of 30 m wide gob is more stable; the rock mass on the right side is the most damaged. The rock mass in the middle of the two goafs fell to the left, causing the surface to show significant settlement. The right side of the coal seam can be reinforced or the horizontal constraint imposed on the rock mass before the 30 m wide coal seam is mined, while the right side of the 40 m wide coal seam can not be reinforced.