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A study on the effects of overlying soil strata on the stresses developing in a tunnel lining

机译：上覆土层对隧道衬砌应力产生影响的研究

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摘要

Shield tunnel lining in soft ground is usually designed based on empirical and analytical methods. These methods are convenient and easy to use; however, they are based on simplifying assumptions related to soil homogeneity around and above the excavated tunnel. The effects of overlying stiffer layers on the tunnelling induced settlement has been investigated by several researchers and was found to significantly influence ground movements. This study evaluates the effects of overlying stiff layers above a tunnel excavated in soft ground on the stresses developing in the tunnel lining. Laboratory investigation is conducted to study how the presence of these layers influence bending stresses in a model tunnel constructed in soft clay and overlain by a coarse sand layer located at different heights above the tunnel. Validation using the experimental results, elasto-plastic finite element analyses are then performed to explain the role of the relative stiffness between the overlying layer and the soft soil deposit hosting the tunnel. Depending on the thickness and location of the overlying stratum, the presence of a stiff layer above the tunnel can have a significant impact on the stresses developing in the tunnel lining.
机译：软土地基中的盾构隧道衬砌通常是基于经验和分析方法来设计的。这些方法既方便又易于使用。但是，它们基于简化的假设，这些假设与开挖隧道周围和上方的土壤均质性有关。几位研究人员已经研究了覆盖较硬的层对隧道诱发的沉降的影响，发现其对地面运动有显着影响。这项研究评估了在软土地基上开挖的隧道上方的刚性层对隧道衬砌内应力的影响。进行了实验室研究，以研究这些层的存在如何影响由软粘土建造的模型隧道中的弯曲应力，并在位于隧道上方不同高度的粗砂层上覆盖。利用实验结果进行验证，然后进行弹塑性有限元分析，以解释上覆层与承载隧道的软土沉积物之间的相对刚度的作用。根据上覆地层的厚度和位置，在隧道上方存在刚性层可能会对隧道衬砌中产生的应力产生重大影响。

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