General solutions for the longitudinal deformation of shield tunnels with multiple discontinuities in strata
General solutions for the longitudinal deformation of shield tunnels with multiple discontinuities in strata
复制标题
地层多间断盾构隧道纵向变形的通用解决方案
DOI：
10.1016/j.tust.2020.103652
复制
发表时间：
2021-01-01
影响因子：
6.9
通讯作者：
Yi, Yaolin
中科院分区：
文献类型：
--
作者：
Cheng, Hongzhan;Chen, Renpeng;Yi, Yaolin
本文提出了一种评价盾构隧道施工后潜在扰动引起的纵向变形的方法，主张考虑具有多个不连续面的地层。文克勒地基上的一个Reynshenko梁被用来表示土-隧道相互作用。新的发展包括分析解决方案的纵向等效弯曲和剪切刚度的环向节点的螺栓和混凝土的弹塑性行为的考虑。提出了两种环缝结构布置形式的剪切荷载传递理论模型。在隧道下卧地层中的不连续处施加连续性以求解平衡控制方程。因此，该方法的优点是可以很好地预测盾构隧道的变形特性，即，沉降、错位、环缝张开。所提出的方法进行了测试，从模型试验的数据在文献中，可以提供一个令人满意的估计隧道变形。此外，参数研究进一步提出的荷载模式和地面条件对隧道的纵向行为的影响进行分析。
This paper proposes an approach for evaluating the longitudinal deformation of shield tunnels caused by potential disturbance after construction, advocating consideration of the stratum with multiple discontinuities. A Timoshenko beam resting on the Winkler foundation is employed to represent the soil-tunnel interaction. New developments include the analytical solutions for the longitudinal equivalent flexural and shear stiffness of circumferential joints with the consideration of the elastic-plastic behavior of the bolt and concrete. A theoretical model is suggested for the shear load transfer of two structural layouts of circumferential joints. Continuity at the discontinuity in the underlying stratum of the tunnel is imposed to solve the governing equations of equilibrium. Consequently, the advantage of this approach is can well predict the deformation characteristics of shield tunnel, i.e., settlement, dislocation, opening of circumferential joints. The proposed approach is tested against the data from the model test available in the literature and can provide a satisfactory estimate of the tunnel deformation. Additionally, parametric studies are further presented to analyze the influence of loading patterns and ground conditions on the longitudinal behavior of the tunnels.