急斜近距煤层联合开采三维数值模拟研究

Study on 3D numerical simulation on combined mining of steep inclined seams with closed distance

为研究急斜近距煤层联合开采中围岩的稳定性,通过三维数值模拟,对碱沟煤矿联合开采的B19和B20煤层采后围岩的应力场和位移场进行了研究。研究结果表明:联合开采时采场围岩顶板方向引起的位移、应力变化要比在底板显著,但并不会引起围岩破坏运动范围的急剧增加,联合开采可成为解决急斜近距煤层开采困难的有效途径。研究为乌鲁木齐矿区赋存的大量急斜近距煤层的有效开采提供了科学依据,同时对其它具有类似开采条件的煤层的开采也具有一定的借鉴意义。

In order to study the stability of the surrounding rocks in the combined mining in the steep inclined seams with a closed distance, a 3D numerical simulation was applied to study the stress field and displacement field of the surrounding rocks after the coal mining in the combined seams of B19 and B20 seams in Jiangou Mine. The study results showed that the displacement and stress variation caused by the surrounding rocks and roof direction of the combined mining would be more obvious than the floor, but would not cause the serious increasing of the surrounding failure scope and the combined mining could be an effective access to solve the mining problem of the steep inclined seams with a closed distance. The study could be scientific basis for the effective mining of great steep inclined seams with a close distance in Urumqi Mining Area and could have the certain references to the seam mining with the similar mining conditions.