岩层移动动态过程的离散单元法分析

Discrete element method for rock movement analysis

采动覆岩动态发展过程受地质、采矿条件诸多因素的影响,是一个十分复杂的时空过程。通过离散单元法数值模拟,揭示了综放开采条件下采场上覆岩层动态发展规律,特别是覆岩离层缝隙的分布规律、发展形态、空间位置以及与地质采矿条件的关系,揭示了工作面推进过程中,采场上覆岩层中重新分布的应力大小、方向及其发展变化规律,该应力的存在和变化规律是确定井下开采方法、支护方式的依据。

The dynamic development of overburden strata is a complicated space-time process due to the influence of conditions of mining and geology. The discrete element numerical simulation is used to show the dynamic laws of development of overburden strata under fully mechanized top-coal caving,especially the distribution development, the location of bed-separation void, and the relation between the character of bed-separation and mining. Simultaneously the redistributed stress, direction and development laws in the mining field of overburden strata are obtained while the working face is advancing. This provides important theoretic evidence for guiding the engineering practice.