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基于中国在高外水压地区修建长大山岭隧道增多的现象,就涉及隧道衬砌结构在高外水压作用下的力学响应相关问题进行了研究。运用荷载结构法,采用三维有限元模型,以白芷山隧道工程为依托,对白芷山隧道在无外水压、均匀分布的高外水压和不均匀分布的高外水压影响下衬砌结构最大弯矩、轴力值大小及发生位置的变化进行研究;并根据外水压最大断面处衬砌结构的实际配筋情况计算其在外水压分布均匀和不均匀条件下的安全系数。分析结果表明:在高外水压作用下隧道衬砌结构的最大弯矩和轴力值都显著增加,且发生位置也在发生变化;水压最大断面处的安全系数大小在水压分布不均匀情况比水压分布均匀情况整体降低。
Based on the phenomenon of the increase of mountain tunnels built in China in areas with high external pressure, the problems related to the mechanical response of tunnel lining structures subjected to high external water pressure are studied. Using load structure method and three-dimensional finite element model, based on the Baizhi Mountain Tunnel Project, the liner structure of Baizhi Mountain Tunnel under the external water pressure without uniform external pressure and the high external water pressure with uneven distribution is the largest Bending moment and axial force, and the change of its location. According to the actual reinforcement of the lining structure at the maximum section of external water pressure, the safety factor under the condition of uniform and uneven external water pressure distribution is calculated. The analysis results show that the maximum bending moment and axial force of tunnel lining structure increase significantly under high external water pressure, and the location of the tunnel lining also changes. The safety factor at the maximum water pressure section varies with the distribution of water pressure Lower than the overall pressure distribution.