掘进机截齿截割煤岩破坏过程模拟分析

Simulation and Analysis on the Failure Process of Cutting Coal and Rock in the Roadheader

针对截齿截割的破坏过程,建立煤岩及截割头的离散元模型,从煤岩的动态破坏速度的角度对煤岩的截割破坏过程进行离散元仿真分析,结果表明,在初始阶段,主要是截齿对煤岩体产生铲切作用,使得煤岩颗粒沿着截齿面产生向上的运动趋势,且沿着截齿的前端面排出,产生煤体的破碎,形成截煤过程。在掘进机进行截割的过程中,依据煤岩的性质确定合适的截齿截割的参数,从而可以优化截割过程,提高掘进的效率。

The discrete element simulation analysis is carried out for the failure process of cutting,and the discrete element model of coal rock and cutting head is established.The results show that in the initial stage,the cutting effect is mainly caused by cutting the coal rock body.Coal and rock particles are discharged along the front face of the cutting,resulting in coal body breakage and coal cutting process.In the process of cutting the roadheader,the appropriate cutting parameters are determined according to the properties of coal and rock,so that the cutting process can be optimized and the efficiency of tunneling can be improved.