富溪双连拱隧道偏压段管棚效应分析

Analysis on Effect of Pipe Forepoling Installed for Asymmetrically-loaded Sections of Double-arch Tunnels: Case Study on Fuxi Tunnel in China

采用三维弹塑性有限差分法[1]对富溪双连拱隧道进口偏压段管棚的预支护作用进行了分析,得出了软岩中管棚支护作用明显,偏压双连拱隧道管棚不均衡设计等结论,对同类工程的设计与施工具有一定的指导意义。

In the paper, analysis is made on the advance reinforcement effect of the pipe forepoling installed for the asymmetrically-loaded entrance portal section of Fuxi double-arch tunnel by means of 3 D elastic-plastic finite difference method. Conclusion is drawn that obvious reinforcement effect can be achieved in soft ground by means of pipe forepoling and that unbalanced design of the pipe forepoling should be made for asymmetrically-loaded sections of double-arch tunnels. The paper can provide reference for the design and construction of similar works.