广贺高速公路某大跨度连拱隧道施工力学研究

Research on Construction Mechanics of a Large-span Multi-arch Tunnel in Guangzhou-Hezhou Expressway

大跨度连拱隧道施工中,其施工步序较多,引起较多的不利因素导致施工困难。应用有限单元法对广贺高速公路某大跨度连拱隧道的完整开挖过程进行动态模拟研究,通过对围岩位移、应力以及塑性区动态变化进行监控,提出大跨度隧道施工中容易出现的问题,为大断面连拱隧道的设计和施工提供依据。

During construction of large-span multi-arch tunnel,many construction steps and sequences cause a lot of adverse factors which lead to the difficulty of construction.This paper carries out the dynamic simulation and research for the complete excavation process of a large-span multi-arch tunnel in Guangzhou-Hezhou Expressway by means of finite element method and proposes problems which are easy to raise during the construction of large-span tunnel by monitoring the dynamic variations of the displacement,stress and plastic areas of the wall rock,thus providing the basis for design and construction of the large-section multi-arch tunnel.