Segment uplift is a frequent problem during the construction of shield tunnels. The phenomenon of segment uplift in Xuzhou Metro Line 1 is investigated. The segment uplift magnitude in the shale layer is quite smaller than that in the clay layer. A tunnel segment uplift calculation model based on the Pasternak foundation beam model is proposed, which considers the hardening process of the grouted body with time. The finite difference method is adopted to calculate the magnitude of segment uplift during different tunnel construction stages, and a numerical solution of segment uplift on the longitudinal direction is obtained. The applicability of the numerical solution is studied by comparing with the field test results and parametric analyses are also performed to investigate the effects of different factors on segment uplifting. The results show that the coefficient of subgrade modulus, shear stiffness of the shear layer, and grout pressure all influence the segment uplifting of the tunnel. The influence of the coefficient of subgrade modulus and grout pressure on segment uplift is more significant.

中文翻译：

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基于Pasternak模型的地铁盾构隧道施工期隧道段抬升模型

管段隆起是盾构隧道施工过程中经常出现的问题。徐州地铁1号线段隆起现象研究 页岩层段抬升幅度远小于黏土层段。提出了一种基于Pasternak基础梁模型的隧道管片隆起计算模型，该模型考虑了灌浆体随时间的硬化过程。采用有限差分法计算隧道不同施工阶段管片隆起的大小，得到管片纵向上隆起的数值解。通过与现场试验结果的比较研究数值解的适用性，并进行了参数分析，以研究不同因素对管片抬升的影响。结果表明，路基模量系数、剪切层剪切刚度和灌浆压力均影响隧道管片的抬升。路基模量系数和灌浆压力对管片抬升的影响更为显着。