Investigation on structural performance of segmental linings of shield tunnels under loading–unloading-reloading condition

IF 6.7 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Dong-Lin Feng, Huai-Na Wu, Fan-Yan Meng, Si-Qi Yang, Ren-Peng Chen
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引用次数: 0

Abstract

The shield tunnel structure built in urban area may suffer from complex disturbance caused by adjacent construction, which leads to loading–unloading-reloading on the tunnel structure, causing accumulation of structural deformation and diseases. In this paper, an elaborate FEM numerical model of segmental linings was established for studying the structural performance of the linings under a loading–unloading-reloading condition which is simulating the complex urban disturbance. The results show that three different deformation modes (Full recovery, Partial recovery and Deformation growth combined with elastic recovery) for the segmental linings can be observed in the unloading process with different historic peak value of the load. A deformation growth phenomenon occurs at the beginning of unloading process in the combined recovery mode and the deformation increment is mainly derived from the change in geometric contact state of joint section. The increase of the load value in loading stage results in the enhancement of nonlinear characteristics and the deterioration of ultimate capacity for the longitudinal joints which directly weaken the deformation recoverability and ultimate capacity of the segmental linings. When the vertical deformation is greater than 50 mm, the deformation recovery rate αre declines to 0 % and the deformation decrease in elastic recovery stage is covered by the increase in deformation growth stage during unloading process. An index named deformation residual energy Eres was proposed to evaluate the structural safety of the segmental ring. Its decrease can quantitatively reflect the accumulation of unrecoverable deformation and material damage caused by the disturbance conditions.
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来源期刊
Tunnelling and Underground Space Technology
Tunnelling and Underground Space Technology 工程技术-工程:土木
CiteScore
11.90
自引率
18.80%
发文量
454
审稿时长
10.8 months
期刊介绍: Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.
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