Abstract:

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 3D 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.