摘要
以某矿南轨道运输石门与2#调车线2条巷道相交的三岔口为研究对象,通过数值模拟,研究不同交叉角度对巷道三岔口围岩稳定性的影响。结果表明:随着巷道三岔口的开挖,巷道交叉处两帮均会出现一定厚度的卸压区,卸压区主要位于锐角三角区域端部,呈扇形分布;随着交叉角度的增大,巷道交叉处锐角三角区域围岩应力集中系数逐渐减小,钝角三角区域围岩应力集中系数逐渐增大,最后指出了巷道三岔口交叉处锐角三角区域围岩面积与钝角三角形区域围岩面积的比值是判定巷道三岔口处围岩顶板下沉量、应力集中程度、卸压区厚度、位移变化量的一个重要指标。
Taking the divergence formed by south rail haulage crosscut and No. 2 shunting track two roadways as research object,we research the effect of different cross angles on stability of roadway divergence by numerical simulation,the results show that with the excavation of the roadway divergence,roadway at the intersection of two groups will have a certain thickness of the relief zone,relief area is mainly located at acute triangle area end with fan distribution; with the crossing angle increasing,the stress concentration value of acute triangle intersection roadway surrounding rock decreases,stress concentration value of obtuse triangle rock increases; finally,the ratio of the roadway at the intersection of acute triangle crossroads area surrounding rock and country rock obtuse triangle area is an important indicator of the roof subsidence,stress concentration,pressure relief zone thickness,the amount of displacement.
出处
《煤矿安全》
CAS
北大核心
2015年第7期200-203,共4页
Safety in Coal Mines
关键词
巷道三岔口
数值模拟
交叉角度
围岩稳定性
roadway divergence
numerical simulation
crossing angle
surrounding rock stability
