Study on ultimate bearing capacity of shield tunnel based on damage model of concrete

被引：0
|
作者：
Shi C. [1 ]
Wang Z. [1 ]
Liu J. [1 ]
Lei M. [1 ,2 ]
Peng L. [1 ]
Peng Z. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] Ministry of Education Key Laboratory of Engineering Structure of Heavy Haul Railway, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 11期
基金：
中国国家自然科学基金;
关键词：
3D discontinuous contact model; elastoplastic damage model of concrete; shield tunnel; ultimate bearing capacity;
D O I：
10.11817/j.issn.1672-7207.2022.11.012
中图分类号：
学科分类号：
摘要：
A damage-based analysis method for the ultimate bearing capacity of shield tunnels was proposed. A bi-scalar elastoplastic damage constitutive model based on energy-based stress decomposition was introduced to describe the damage and deterioration behavior of concrete materials. Then, an elaborate numerical model of shield tunnel was constructed based on the 3D discontinuous contact model. Finally, the proposed method was verified by comparing with the full-scale experiment results. The results show that the simulated load−convergence deformation curves and damage characteristics of concrete segments using the proposed method are in good agreement with the experimental results, and the development of structural deformation, internal force transmission, damage evolution process, failure mode and stress redistribution during the loading process can also be well reflected. The failure and destruction process of tunnel structure can be divided into linear elastic stage, yield-damage stage and failure stage, the simulated load limits of stages I and II are 227.62 kN and 418.12 kN, respectively, and the corresponding convergent deformation limits are 0.17%Dt and 1.34%Dt(Dt is diameter of tunnel) under the experiment load condition. When the convergent deformation of the tunnel reaches the specified limit of 0.60%Dt, multiple longitudinal discrete cracks appear on the tunnel crown, bottom and the both sides of waist, and the joint bolts on the tunnel crown begin to yield, and the plastic hinge at the joint appears gradually. The failure mode of shield tunnel is that the joint bolts on tunnel crown and waist yield, the concrete segment cracks, and finally multiple joint plastic hinges are formed. © 2022 Central South University of Technology. All rights reserved.
引用
收藏
页码：4310 / 4325
页数：15
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