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为防止煤堆在开挖过程中失稳滑坡,导致施工机械和人员损伤,造成安全生产事故.分析了煤颗粒此类散粒体的应力应变特征及煤堆开挖过程的失稳机理.根据这些特征,使用基于颗粒流理论的PFC3D对煤堆开挖过程进行了模拟.对实例煤堆提出了一套开挖过程,分为8种工况,给出了开挖稳定后的颗粒图、位移图和CForce图.模拟结果表明:煤堆开挖过程的变形可分为三个阶段:工况1~工况3、工况4~工况6、工况7~工况8,分别代表煤堆的稳定阶段、过渡阶段和失稳阶段,并对其变形特征进行了描述.最后建议煤堆开挖应处于过渡阶段,即煤堆开挖高度应为9.4~16.45 m.
In order to prevent the coal pile from instability and landslide during the excavation process, the construction machinery and personnel will be damaged and the safety accidents will be caused.The stress and strain characteristics of such granular materials such as coal particles and the instability mechanism of coal mass pile during excavation are analyzed. These characteristics are simulated using the PFC3D based particle flow theory on the coal pile excavation process.A set of excavation process is proposed for the example coal pile, which is divided into eight kinds of working conditions, the particle map after the excavation is stable, Displacement diagram and CForce diagram.The simulation results show that the deformation of the coal pile excavation process can be divided into three stages: condition 1 ~ condition 3, condition 4 ~ condition 6, condition 7 ~ condition 8, respectively The stability, transition and destabilization stages of the coal piles are described, and the deformation characteristics are described.Finally, it is suggested that the coal pile excavation should be in the transitional stage, ie the height of the coal pile excavation should be 9.4 ~ 16.45 m.