超大跨车站隧道三维数值模拟分析

乌蒙山2号隧道是改建铁路贵昆线六盘水至沾益段增建2线工程，出口段扒挪块车站伸入隧道内547 m，为4线大跨车站隧道，开挖轮廓最大跨度为24.13 m，为目前亚洲铁路隧道开挖最大跨。为研究此车站隧道设计与施工方案的合理性，采用FLAC3D 三维快速拉格朗日差分方法分析软件对此超大跨车站隧道施工开挖过程进行三维数值模拟计算。通过分析车站隧道开挖过程中围岩和支护结构的2次应力场、变形场和塑性破坏区的变化特征，总结了车站隧道围岩和支护的应力、变形和破坏区的分布特征和变化规律，为推荐施工方法的安全性及临时支护的拆除方案提供理论依据。

3D numerical simulation of super-large span railway station

Wumeng mountain second tunnel is secondary Line from Liupanshui to Zhanyi of Guiyang-Kunming Railway reconstruction.Banuokuai Railway Station situated gate region was extended to the tunnel about 547 m,which is a large span station for 4 lines.It is the largest span(24.13 m) tunnel in Asia at present.The excavation process of the super-large span station is numerically simulated by three dimensional fast Lagrangian analysis of continua(FLAC3D) to research rationality of the design and construction.And,on th...