Mechanical properties of segmental joints strengthened by assembled reinforcement structures for shield tunnel linings

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外文摘要：We develop assembled reinforcement structures (ARSs) composed of connection parts,connecting rods,and straight bolts to strengthen segmental joints in the lining of shield tunnels.Through full-scale bending experiments and numerical simulations,we investigate the deformation and failure characteristics of segmental joints strengthened by ARSs,and propose a novel optimization method for ARSs.The experimental results show that the ARSs can effectively limit the opening of a segmental joint,but also that separation can occur during loading if the connection between the ARSs and segments is not designed properly.Importantly,this connection can be improved by embedding anchor parts in the concrete.In numerical modeling,we investigate the failure modes of segmental joints strengthened by ARSs for both positive bending and negative bending loading cases.In the case of positive bending loading,first the concrete around the anchor parts cracks,and subsequently the concrete on the external side of the joint is crushed.The joint failure is caused by the crushing of concrete on the external side of the joint.While the un-strengthened segmental joint fails with an opening of 5.884 mm,the strengthened segmental joint only opens by 0.288 mm under the same loading,corresponding to a reduction of 95.1％.In the case of negative bending loading,the concrete around the anchor parts first cracks,and then the amount of joint opening exceeds a limiting value for waterproofing (6 mm),i.e.,the joint's failure is caused by water leakage.While the opening of the un-strengthened segmental joint is 9.033 mm and experiences waterproofing failure,the opening of the strengthened segmental joint is only 2.793 mm under the same loading,corresponding to a reduction of 69.1％.When constructing a new shield tunnel,anchor parts could be embedded in the concrete segments in tandem with ARSs for improved resistance to joint opening.For existing shield tunnel linings,anchor parts cannot be embedded in the concrete segments;therefore,the connections between the ARSs and concrete need to be optimized to strengthen the segmental joint.

外文关键词：

Shield tunnelSegmental jointAssembled reinforcement structure (ARS)Mechanical properties

作者：

Zhiguo YAN、Sihang AI、Xia YANG、Long ZHOU、Bing FAN、Huan PANG

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作者单位：

State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China

Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China

Jinan Rail Transit Group Co.,Ltd.,Jinan 250101,China

School of Safety Science and Engineering (School of Emergency Management),Nanjing University of Science and Technology,Nanjing 210094,China

China Railway No. 5 Engineering Group Co.,Ltd.,Guiyang 550003,China

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出版年：

2024

DOI：

10.1631/jzus.A2300455

浙江大学学报(英文版)(A辑:应用物理和工程)

浙江大学

浙江大学学报(英文版)(A辑:应用物理和工程)

CSTPCD

影响因子：0.556

ISSN：1673-565X

年,卷(期)：2024.25(12)