中文摘要：

兰州地铁1号线下穿黄河段盾构隧道主要穿越高压富水砂卵石地层,面临着众多技术难题。文章首先基于最大冲刷深度组成,计算得出了考虑隧址处既有桥墩影响的最大冲刷线,满足了区间隧道纵断面的设计要求;然后采用修正的等效连续化模型对隧道的纵向沉降规律进行了分析,发现隧道纵向刚度对其纵向变形影响较小,采用增大管片环间连接刚度的措施对控制变形作用甚微;在不同冲刷工况下,过黄河段隧道的纵向沉降规律相同,差异沉降主要集中在河床地形过渡段;对地震作用下衬砌的内力进行分析,发现衬砌结构属于小偏心受压,隧道抗震稳定性满足要求;最后通过计算验证了管片接缝双道止水装置与单层衬砌设置的合理性。

英文摘要：

The shield tunnel section of Lanzhou metro line 1, which crosses below the Yellow River, is located in water-rich sandy cobble ground and therefore faces many technical problems. First, in order to satisfy the design requirements of the tunnel profile, the maximum erosion line is calculated with consideration of the influence of the existing piers at the tunnel site and based on various maximum erosion depth components. Then, after analyz- ing tunnel longitudinal settlement laws by a modified equivalent continuous model, it is determined that the longi- tudinal rigidity of the tunnel has a small effect on the longitudinal strain, and increasing the connection stiffness between segment rings has a small effect on deformation control. Although the tunnels crossing below the Yellow River are subjected to different erosion conditions, they have the same longitudinal settlement laws, and the dif- ferential settlement is mainly concentrated in the transition zone of the riverbed. Based on the analysis of the in- ternal force of a lining under seismic effects, it is determined that the lining structure is subjected to a compres- sion load with little eccentricity, and the seismic stability of the tunnel meets the relative requirements. Finally, the rationality of double-sealing devices for the segment joint and single-layer lining is verified by calculations.