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为寻求原煤仓壁面宏观变形、裂缝现象的内在机理,采用离散单元法模拟了电厂原煤仓的卸料流态及卸料过程中仓体壁面的动态受力情况及物料内部的压力分布网络。模拟结果表明:筒体中同一水平层处的颗粒流速基本相同,而锥体中颗粒的原有层面呈不均匀下降,在流动过程中,每下降一个微小高度,颗粒位置都要进行重新排列,中心处颗粒流速较大,靠近壁面处颗粒流速较小。整体流动状态时原煤仓筒体法向受力远大于切向受力,压力拱的形成使得筒体和锥体壁面所受压力增加。因此,削弱峰值压力及破坏拱结构是减少原煤仓变形和裂缝的两个重要因素。
In order to seek the internal mechanism of macroscopic deformation and cracks in coal bunker wall, the discrete element method is used to simulate the unloading flow of coal bunker and the dynamic stress of bunker wall and the pressure distribution network inside the bunker. The simulation results show that the flow velocity of particles in the same horizontal layer in the cylinder is basically the same, but the original level of the particles in the cone decreases nonuniformly. Every time the flow velocity decreases by a small height, the particle positions must be rearranged, Center particle flow rate is larger, near the wall at the particle flow rate smaller. When the overall flow state of the coal cylinder cylinder normal force is far greater than the tangential force, pressure arch formation makes the cylinder and the cone wall pressure increased. Therefore, weakening the peak pressure and damaging the arch structure are two important factors to reduce the deformation and fracture of the coal bunker.