各向异性纯黏性土中纵向倾斜隧道掌子面稳定性分析（英文）

Face stability analysis for a longitudinally inclined tunnel in anisotropic cohesive soils

基于连续速度场(CVF),本文研究了一种考虑隧道纵向倾斜角和纯黏土各向异性的隧道掌子面稳定性分析方法。首先,本文结合极限分析法和离散化技术,提出了一种均压盾构施工下的纵向倾斜隧道改进三维连续速度场模型。然后,基于该模型,作用在隧道掌子面上的临界支护压力可以通过能量平衡方程计算确定。同时,建立一系列有限元数值模型与三维连续速度场模型进行对比,结果验证了改进的连续速度场模型的正确性。最后,本文研究了隧道倾角、一些无量纲参数以及土体各向异性对临界支护压力的影响。结果表明,在隧道工程的实际设计中,应考虑土体各向异性和隧道倾角对隧道掌子面的影响。

A stability analysis approach of tunnel face considering a longitudinally inclined tunnel angle and anisotropic purely cohesive soils based on a continuous velocity field (CVF) is investigated in this study. Based on the kinematic approach of limit analysis and the discretization technique, an improved three-dimensional CVF model for longitudinally inclined tunnels driven by pressurized shields is proposed. With the proposed model, the critical support pressure acted on tunnel face is determined by the work-balance equation. A serial of finite element numerical models are conducted to validate the proposed model. Finally, the effects of tunnel inclination angles, several dimensionless parameters as well as soil anisotropy on the critical support pressure are investigated. The numerical results show that the effects of the soil anisotropy and the tunnel inclination angle on tunnel faces should be considered in the actual design of tunneling engineering.