【摘要】 洞室围岩破坏通常是从局部开始的,首先破坏的部位就是围岩的薄弱部位或关键部位。对薄弱部位及时加固将收到事半功倍的效果。围岩软弱层带和围岩应力集中是形成薄弱区的两种基本原因。围岩的薄弱部位既具有一定的规律性,又可因岩体结构特征、初始地应力场、洞室形态和洞轴线展布方向、开挖方式的不同而有所区别。对泰安抽水蓄能电站地下洞群围岩稳定性进行了三维有限元数值模拟研究,结果表明:围岩最薄弱部位有时可能在距洞端一定距离上;围岩稳定性分析中选择洞室中部垂直洞轴线剖面作为典型剖面进行稳定性分析,由此而获得的计算结果有时可能偏于不安全。对于复杂的大型地下洞室群,应采用三维数值分析方法进行模拟才能找出潜在的围岩薄弱区。更多还原

【Abstract】 The rockmass failure with underground excavation often results from local instability. The initial failure position is the weak part of surrounding rockmasses. The failure of surrounding rockmasses may be caused by lower strength of rockmasses somewhere or by concentration of stress by excavation. 3D finite element modeling is made to study the stability of the surrounding rockmasses of Tai抋n pumped storage powerstation. The numerical study shows that the weak position is not located at the middle of the powerhouse,but at the part with certain distance to one end of the power house. Therefore,the support design based on 2D numerical simulation is not safe,which shows that the weak position is located at the middle part of the powerhouse,and the support design based on 3D numerical modeling should be taken instead.更多还原