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盾构隧道的渗流对隧道的长期沉降等长期性态有重要的影响。针对软土盾构隧道的特点,假设隧道达到稳定渗流时,作用于衬砌外壁的总水头为一个未知常量,在此假设基础上,推导出隧道周围土体渗流场的发展及孔隙水压力的分布。通过土体渗入隧道的渗流量与通过衬砌渗入隧道的渗流量相等这一等量关系,计算衬砌外壁的未知常量水头。得到隧道稳定渗流时的渗流场和渗流量的解析解。最后,通过与数值模拟以及已有解析解答的对比,验证了解析方法的合理性。
The seepage of shield tunnels has an important impact on long-term behavior such as long-term settlement of tunnels. Considering the characteristics of soft soil shield tunnels, assuming that the tunnel reaches steady seepage flow, the total head acting on the outer wall of lining is an unknown constant. Based on this assumption, the development of soil seepage field around the tunnel and the distribution of pore water pressure . The unknown constant head of the lining of the lining is calculated by the equal relation between the seepage flow of seepage into the tunnel and the seepage through the lining. Analytical solution to the seepage field and seepage flow when the tunnel is steady seepage is obtained. Finally, by comparing with the numerical simulation and the existing analytical solution, the rationality of the analytical method is verified.