采空区充填控制巨厚火成岩下动力灾害的数值模拟

Numerical Simulation on Dynamic Disaster Control by Goaf Filling below Extremely Thick Igeneous Rock

以某矿1022工作面为工程背景,利用UDEC建立二维离散元模型,模拟分析了工作面充填开采与未充填开采相比减小地表下沉,降低采空区两侧煤体集中应力的效果。研究结果表明:采用充填开采时,多个支撑点对上覆岩层载荷进行支撑,顶板的挠度值减小,巨厚火成岩弯曲下沉量减小;采空区两侧煤体受到的集中应力降低,应力集中系数减小,采用充填开采可有效地控制上覆岩层运动,降低因采动影响巨厚火成岩突然发生破断引起的动力灾害。

Based on the engineering background of 1022 working face of a coal mine,analyzed the interaction relationship of the backfill and surrounding rock after the goaf stowing. By establishing two dimension discrete element by UDEC,analyzed the effect of reducing the surface subsidence between the different mining method of working face stowing method and caving method. The results show that overlying strata load was supported by multiple support points by using stowing method, the deflection value of roof decreased, the bend subsidence value of thick igneous rock decreased;maximum ground subsidence coefficient was low. On both sides of the coal mined-out area by reducing the concentration of stress and stress concentration coefficient decreases, and the filling mining can effectively control the overburden movement, reduce a sudden rupture is caused by mining influence the thick igneous rock dynamic disasters.