论文部分内容阅读
采用不同施工方法,对单拱四车道公路隧道进行施工力学数值模拟,分析了不同施工步时的位移和应力集中系数变化曲线,并对施工方法进行比较。研究结果表明:拱顶围岩是否稳定是选择施工方法时必须考虑的关键因素,拱部围岩适宜采用分部或分块开挖;双侧壁导坑法和CD法是开挖Ⅴ级围岩单拱四车道公路隧道较优的施工方法;边墙是最易出现应力集中的部位。
Different construction methods were used to simulate the construction mechanics of single-arch four-lane road tunnel. The curves of displacement and stress concentration factor under different construction steps were analyzed, and the construction methods were compared. The results show that whether the surrounding rock of the vault is stable or not is the key factor that must be considered when choosing the construction method. The surrounding rock of the arch is suitable for excavation by block or block. The double- Rock single-arch four-lane highway tunnel construction method; wall is the most prone to stress concentration of the site.