冲击载荷对巷道稳定性的影响研究

Study on Bumping Load Affected to Mine Gateway Stability

针对内蒙古唐公沟煤矿工作面巷道围岩条件,采用塑性大变形引起的损伤模型及经典Drucker-Prager准则,运用ABAQUS/EXPLICIT动力学有限元分析程序建立数值计算模型,模拟了冲击载荷距离巷道不同水平及垂直距离时巷道的动态响应过程。结果表明:冲击载荷距离巷道水平距离增大,冲击产生的能量以塑性能释放的区域越大,对巷道稳定性影响越小,且巷帮处能量集中释放区域由上部向下部转移,巷帮的破坏位置也由上部向下部转移;巷道顶板厚度越大,冲击产生的能量以塑性能释放的集中程度减小,巷道越稳定,模拟结果与现场情况基本一致。

According to the surrounding rock conditions of the mining gateway in Tanggonggou Mine, Inner Mongolia, with the damage model occurred by the plastic large deformation and the classical Drucker - Prager norms, the ABAQUS/ EXPLICIT dynamics finite element analysis program was applied to establish a numerical calculation model and to simulate the gateway dynamic response process when the bumping load occurred in different level and vertical level distance to the gateway. The results showed that when the bumping load distance increased with the gateway horizontal distance L, the energy occurred by the bumping and the plastic energy releasing zone would be increased and would have less influence to the gateway stability. The energy concentrated releasing zone near the gateway side wall would be migrated from the top to bottom and the failure location at the gateway side wall would also be migrated from the top to bottom. The higher the roof thickness of the gateway, the less of the energy occurred by the bumping and the concentrated degree of the plastic energy released would be and the more stable of the gateway would be. The simulation results and the site conditions were basically same.