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为了验证厦门海底隧道最小顶板厚度比设计厚度减小时隧道的稳定性。在厦门海底隧道轴线的地质剖面图上 ,选取了 4个典型剖面 ,根据设计方案 ,将隧道轴线高程比原设计升高 4m ,依据流固耦合理论 ,应用三维快速拉格朗日法进行数值分析。从隧道轴线升高 4m时 ,开挖后的应力分布、洞周位移、塑性区、孔隙水压力分布等结果 ,可以得出将设计方案的轴线位置升高后 ,隧道是稳定的。同时 ,得到一些对后续施工和其他工程有一定的指导意义的有益结论。
In order to verify the stability of the tunnel when the minimum roof thickness of Xiamen subsea tunnel is smaller than the designed thickness. According to the design scheme, the elevation of tunnel axis is 4m higher than the original design according to the geological profile of the Xiamen Subsea Tunnel axis. According to the fluid-solid coupling theory, the numerical analysis is carried out by using the three-dimensional fast Lagrangian method . When the axis of the tunnel rises 4m, the stress distribution after excavation, the displacement of surrounding rock, the plastic zone and the distribution of pore water pressure etc. can be concluded that the tunnel is stable after the axial position of the design scheme is increased. At the same time, some helpful conclusions are obtained that have certain guiding significance for subsequent construction and other projects.