Numerical analysis of size effect on the deformation behavior and damage evolution mechanism of segmental tunnel lining rings

Abstract

This article investigates the size effect of segmental tunnel linings on the deformation behavior and the damage evolution mechanism using the Finite Element Method (FEM). A series of models with different diameters are established under the same loading condition to control the variable. The bolts and the rebar apply the elastic-plastic model. The Concrete Damage Plasticity model has been considered for the concrete lining. The vertical convergence deformation, internal force of these models, and damage to the segment body are selected for comparison. The number and location of the yielded bolts are explored for the analysis of the overall structure stiffness and damage evolution mechanism. In terms of plastic hinge theory, an extended discussion is carried out to explain the differences in damage evolution mechanisms in different-sized linings. The results show the large-diameter lining rings have a relatively greater increasing rate of convergence deformation. Furthermore, fewer plastic hinges emerged in large-scale lining rings before the structures reached their ultimate strength. According to the experimental results, we can know that the failure of large-diameter has the characteristic of more brittle damage than that of small-diameter one and these large-size structures are prone to become unstable geometry.

Application of continuum damage mechanics in fatigue assessment of A516 steel specimens considering residual stresses

“…Hou et al (2023) proposed a nonlinear fatigue damage accumulation model based on the damage curve method under combined high and low cycle fatigue loading. Zhao et al (2023) investigated effect of size of segmental tunnel linings on damage evolution mechanism using finite element method. Huo et al (2022) developed an elasto-plastic damage accumulation model to evaluate fatigue damage of ductile metals at the yield stress.…”

“…(2023) proposed a nonlinear fatigue damage accumulation model based on the damage curve method under combined high and low cycle fatigue loading. Zhao et al. (2023) investigated effect of size of segmental tunnel linings on damage evolution mechanism using finite element method.…”

A resilience assessment framework for microencapsulated self-healing cementitious composites based on a micromechanical damage-healing model

“…With the continuous development of urbanization, urban underground space resources are increasingly scarce. Large-scale and multifunctional development and utilization of underground space in megacities will inevitably develop into deep underground space (Chen, 2018; Zhao et al., 2023). The complex and changeable underground geological environment makes it difficult to recover the underground structure after damage, which requires it to have high performance and durability during the entire life.…”

Effects of multiple edge cracks, shear force, elastic foundation, and boundary conditions on bucking of small-scale pillars

“…It is widely acknowledged that the mechanical characteristics of materials and structures may become size-dependent at small scales (Ju and Yanase, 2011; Zhao et al., 2023). Several nonclassical continuum mechanics-based theories have been developed to address the size effect in the mechanical behavior of miniaturized structures.…”