针对炮采震动引起巷道失稳的柔和支护技术研究

Study on soft support technology for roadway instability caused by gun vibration

针对炮采震动引发煤矿巷道稳固性的情况,从理论上分析了放炮震动引发冲击地压的基本成因。依据赵各庄煤矿具体开采情形,运用有限差分系统FLAC^(2D),对比研究无支护方式与两种各种柔性支护方式相关条件下,巷道受到放炮震动相关影响后的形变情形。分析说明:放炮震动不但提高巷道周围岩层荷载,震动波传导在周围岩层内发生裂纹以及在煤层与顶底板间引发摩擦滑动,因而减少周围岩层体的承力力量;柔性支护方式能有效吸纳放炮震动的能量,减少巷道形变量;放炮开采相关影响下的防冲柔性支护方式,U型钢可伸缩支架略好于锚网支护方式。

Based on stability of coal mine roadway caused by gun vibration, basic causes of impact pressure were analyzed theoretically. According to specific mining situation of Zhaogezhuang Mine, finite difference system FLAC^2D was used to study deformation of roadway under influence of blasting vibration in relative conditions with no support mode and two kinds of flexible support mode. The results showed that blasting vibration increased load of rock strata around roadway and shock waves were caused by cracks in surrounding rock strata and friction occurred between coal seam and roof and floor, which reduced strength of surrounding rock mass; Flexible support method could effectively absorb energy of blasting vibration and reduce roadway shape variables; Under influence of blasting and mining, the u-shaped steel retractable bracket was slightly better than anchor net support mode.