下穿引水隧洞对铁路隧道地震效应的影响研究
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摘要
结合云南省盐津县白水江三级电站下穿内昆铁路手扒岩隧道的实际工程,采用LS-DYNA显式动力分析程序对既有铁路隧道地震效应受下穿引水隧洞的影响进行了研究。研究结果表明:在单个方向地震波作用时,震动速度、加速度响应的最大方向与加载方向一致;在3个方向地震波同时作用下,既有隧道最大响应发生在边墙处;新建下穿隧道建成后,相当于减震洞的形成,既有隧道结构上震动速度、加速度及主应力均有不同程度的减小,使既有隧道交叉段的地震响应得到改善。
Based on the diversion tunnel of the Baishuijiang grade III power station underneath the Shoubayan tunnel on the Neijiang-Kunming Railway in Yanjin county of Yunnan province,the influence of a water tunnel on the seismic effect in the existing tunnel was studied by the LS-DYNA procedure.The results show that under the action of a seismic wave in a single direction,the maximum response direction in terms of vibration velocity and acceleration is in accordance with that of loading;under the simultaneous action of seismic waves in three directions,the maximum response occurred at the sidewall of the existing tunnel;and after the completion of the new water tunnel,the vibration velocity,acceleration,and stress of the existing tunnel structure decrease in different extents,improving the seismic response at the cross section.
Based on the diversion tunnel of the Baishuijiang grade III power station underneath the Shoubayan tunnel on the Neijiang-Kunming Railway in Yanjin county of Yunnan province,the influence of a water tunnel on the seismic effect in the existing tunnel was studied by the LS-DYNA procedure.The results show that under the action of a seismic wave in a single direction,the maximum response direction in terms of vibration velocity and acceleration is in accordance with that of loading;under the simultaneous action of seismic waves in three directions,the maximum response occurred at the sidewall of the existing tunnel;and after the completion of the new water tunnel,the vibration velocity,acceleration,and stress of the existing tunnel structure decrease in different extents,improving the seismic response at the cross section.
引文
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[4]董永香,夏昌敬,段祝半.平面爆炸波在半无限混凝土介质中传播与衰减特性的数值分析[J].工程力学,2006,23(2):60-65 Dong Yongxiang,Xia Changing,Duan Zhuping.Numerical Analysis of Plane Explosive Wave Propagation with Its Attenuation Behavior in Semi-infinite Medium[J].Engineering Mechanics,2006,23(2):60-65
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