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Thermally-induced longitudinal decompression of simultaneously backfill

机译：热诱导的纵向减压同时回填

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The longitudinal compression of concrete segmental linings (CSLs) can enhance the durability of the tunnel structure. The compressive force reduces the risk of water ingress through ring joints and the differential displacements between adjacent rings. The hydraulic jacks of tunnel boring machines (TBMs) compress longitudinally the tunnel tube during construction, but subsequent longitudinal movements in the lining can cause the migration of the prestressing forces to the ground. One significant, yet disregarded, contributor to the longitudinal decompression of CSLs is the time-varying lining temperatures induced by tunnelling, particularly in CSLs that are simultaneously backfilled with cementitious grouts. This paper proposes analytical solutions for the prediction of longitudinal mechanical strains thermally-induced in CSLs during and after tunnelling. The solutions are compared with field data collected from the Crossrail's Thames tunnel. It is proved that time-varying lining temperatures in simultaneously backfill grouted CSLs are responsible for the substantial loss of longitudinal compression exhibited in the months following construction. Tunnels subjected to moderate overburden pressures may experience a total loss of compressive forces at thermal equilibrium. The magnitude of the thermal decompression depends mainly on the temperature profile developed behind the TBM, which is in turn governed by the grout exothermic properties and ambient temperatures. A method for the assessment of longitudinal forces over the CSL design life is proposed for asset owners of future tunnels.
机译：混凝土分段衬里（CSL）的纵向压缩可以增强隧道结构的耐久性。压缩力通过环形接头和相邻环之间的差动位移降低了水进入的风险。隧道镗床（TBMS）的液压千斤顶在施工过程中纵向压缩隧道管，但随后的衬里纵向运动可以导致预应力迁移到地面。一个重要但忽略了CSL的纵向减压的贡献者是通过隧道诱导的时变衬里温度，特别是在与水泥灌浆的同时回填的CSL中。本文提出了在隧道中和后和之后预测CSL在CSL中热诱导的纵向机械菌株的分析解决方案。将解决方案与从CrossRail的泰晤士隧道收集的现场数据进行比较。事实证明，同时回填灌浆CSL的时变衬里温度负责在构建后几个月显示的纵向压缩的大量损失。经过适度的覆盖压力的隧道可能在热平衡时经历完全损失压缩力。热减压的大小主要取决于TBM后面产生的温度曲线，这反过来由灌浆放热性能和环境温度控制。为未来隧道的资产所有者提出了一种评估CSL设计寿命的纵向力的方法。

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