董东矿沿空留巷切顶卸压对底板受力影响分析

Analysis of the influence of the pressure relief of the cutting top of the gob side entry in Dongdong mine on the stress of the floor

以董东矿50107工作面为研究对象,通过数值模拟软件FLAC3D建立模型,对比分析窄矿柱、宽矿柱以及切顶沿空留巷情况下围岩及底板受力特征,确定切顶沿空留巷切顶对围岩的卸压作用。对比分析围岩受力情况,表明切顶沿空留巷卸压效果比较明显,对比分析围岩塑性区的底板破坏深度,表明有利于切顶沿空留巷卸压效果明显,切顶沿空留巷有很好的卸压效果,有利于矿山巷道围岩控制。

Taking the 50107 working face of Dongdong mine as the research object,the model is established by the numerical simulation software FLAC3D,and the stress characteristics of surrounding rock and floor are compared and analyzed under the conditions of narrow pillar,wide pillar and retaining roadway along the gob with the top cut,so as to determine the pressure relief effect of Retaining Roadway along the gob with the top cut on surrounding rock.The comparative analysis of the stress of surrounding rock shows that the pressure relief effect of the remaining roadway along the goaf is obvious.The comparative analysis of the floor failure depth in the plastic zone of surrounding rock shows that the pressure relief effect of the remaining roadway along the goaf is obvious,the remaining roadway along the goaf is good,and the surrounding rock control of the mine roadway is favorable.