Circular tunnels are the most popular shapes in urban underground transportation systems when mechanised tunnelling is used for the tunnel excavation. However, circular tunnels have a small space utilisation ratio. With materials development, non-circular tunnels are now common as their cross-section allows for an improvement in the efficiency of usage of underground space. In this work, the influence of tunnel shape on the lining forces was evaluated by using the hyperstatic reaction method (HRM). The internal forces derived using the HRM model were then compared with the results of a numerical model (Plaxis^2D). A constant soil Young's modulus was adopted in both models. A parametric study was performed in order to assess the effect of parameters such as the Young's modulus of the soil, the lateral earth pressure coefficient, the tunnel lining thickness and tunnel depth on the structural forces produced in the tunnel lining.

中文翻译：

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隧道形状对隧道衬砌行为的影响

隧道开挖采用机械化隧道掘进时，圆形隧道是城市地下交通系统中最受欢迎的形状。然而，圆形隧道的空间利用率较小。随着材料的发展，非圆形隧道现在很常见，因为它们的横截面可以提高地下空间的使用效率。在这项工作中，隧道形状对衬砌力的影响是通过使用超静力反应法（HRM）来评估的。然后将使用 HRM 模型得出的内力与数值模型 (Plaxis ^2D）。两种模型都采用了恒定的土壤杨氏模量。进行了参数化研究，以评估诸如土壤杨氏模量、侧向土压力系数、隧道衬砌厚度和隧道深度等参数对隧道衬砌中产生的结构力的影响。