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随着大量城市公路隧道和地铁隧道大规模的建设,在城市隧道施工过程中,往往会遇到需要穿越既有隧道的工程难题,这类下穿工程对既有隧道的安全形成了严峻的考验,成为城市隧道建设中等级最高的风险工程。软弱围岩条件下新建隧道下穿浅埋隧道工程更是此类工程中风险等级更高的工程,针对新建隧道下穿浅埋既有隧道进行了详细地安全与稳定性分析,详细研究新建隧道的开挖对既有隧道造成的影响,为此类复杂工程问题的解决提供了一种新的解决方法。该方法避免了传统经验类比法以及单纯进行应力、位移分析的不足,系统地对此类问题进行了分析。
With the large-scale construction of a large number of urban road tunnels and subway tunnels, engineering challenges that often require crossing existing tunnels are often encountered during the construction of urban tunnels. These types of underpass projects pose a severe test of the safety of existing tunnels , Becoming the highest level of risk engineering in the construction of urban tunnels. Under the condition of weak surrounding rock, the newly built tunnel under the shallow shallow tunnel project is a project with higher risk level in this project. The safety and stability analysis of the newly built tunnel under the shallow buried tunnel is carried out in detail. The new tunnel Excavation of the existing tunnel impact, for such complex engineering problems to provide a new solution. The method avoids the traditional empirical analogy as well as simply lack of stress and displacement analysis, and systematically analyzes such problems.