巷帮爆破卸压效果数值模拟研究

摘要

Taking Huafeng Mine as the engineering background,a numerical model was established,the effect of blasting pressure relief effect of roadway sidewall in deep rock roadway was studied.The influence of buried depth and the length of blasting hole on blasting pressure relief effect were analyzed.The study results showed that the stress distribution of the surrounding rock was changed by blasting pressure relief,and the stress concentration of surrounding rock was mitigated to reach the purpose of blasting.With the increase of buried depth,the crack near the explosion source was larger,the damage range was greater, more energy was lost,and the more obvious pressure relief effect was achieved.With the decrease of the length of blasting hole, the surrounding rock damage was more obvious.%以华丰煤矿为工程背景,运用数值模拟,建立了数值模型,研究了深部岩石巷道帮爆破卸压效果,分析了巷道埋深、炮孔长度对爆破卸压效果的影响.研究结果表明,爆破卸压改变了围岩应力分布特征,使围岩应力集中程度降低,达到了爆破的目的;埋深越大,爆源附近产生的裂隙越大,损伤范围越大,能量损失越多,卸压效果越明显;炮孔长度越小,巷旁围岩损伤越明显.