Unreinforced construction techniques: ECC-based unreinforced shield tunnel segment joints for enhancing underground infrastructure resilience

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2024-10-14 DOI:10.1016/j.tust.2024.106119

Minjin Cai , Hehua Zhu , Shuwei Zhou , Timon Rabczuk , Xiaoying Zhuang

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引用次数: 0

Abstract

The development of unreinforced construction techniques for shield tunnel segments is crucial for enhancing resilience of underground infrastructure, but research in this field is still lacking. This study addresses this gap by conducting full-scale experiments on ECC-based unreinforced shield segment joints (ECCUS) and comparing their performance with traditional reinforced concrete segment joints (RCS) and ECC reinforced segment joints (ECCRS) under extreme bending loads. The research focuses on material characteristics, segmental deflection, joint behavior, bolt strain, damage propagation, failure modes, joint toughness, and ductility. The results revealed that ECCUS joints had a bearing capacity 2.64 times that of RCS and 1.32 times that of ECCRS in the elastic phase. Their ultimate load capacity surpassed RCS by 27.4% and ECCRS by 24.4%. ECCUS also demonstrated superior ductility, with increases of 131% over ECCRS and 78% over RCS, and exhibited finer, more numerous cracks, enhancing energy absorption and deformability. ECCUS bolts showed a 24% reduction in average strain and a 74% decrease in strain deviation compared to RCS and ECCRS. Furthermore, ECCUS joints displayed exceptional toughness, being 6.2 times greater than RCS and 1.5 times higher than ECCRS during normal serviceability. These findings underscore the potential of ECC in improving the performance and durability of unreinforced tunnel segments.

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非加固施工技术：基于 ECC 的非加固盾构隧道节段接缝用于增强地下基础设施的复原力

开发盾构隧道段非加固施工技术对于增强地下基础设施的韧性至关重要，但这一领域的研究仍然缺乏。本研究针对这一空白，对基于 ECC 的非加固盾构分段接头（ECCUS）进行了全尺寸实验，并比较了其与传统钢筋混凝土分段接头（RCS）和 ECC 加固分段接头（ECCRS）在极端弯曲荷载下的性能。研究重点包括材料特性、分段挠度、连接行为、螺栓应变、损伤扩展、失效模式、连接韧性和延展性。研究结果表明，在弹性阶段，ECCUS 接头的承载能力是 RCS 的 2.64 倍，是 ECCRS 的 1.32 倍。其极限承载能力比 RCS 高 27.4%，比 ECCRS 高 24.4%。ECCUS 还表现出卓越的延展性，比 ECCRS 提高了 131%，比 RCS 提高了 78%，并表现出更细更多的裂纹，增强了能量吸收和变形能力。与 RCS 和 ECCRS 相比，ECCUS 螺栓的平均应变降低了 24%，应变偏差降低了 74%。此外，ECCUS 接头显示出卓越的韧性，在正常使用期间，其韧性是 RCS 的 6.2 倍，是 ECCRS 的 1.5 倍。这些发现凸显了 ECC 在改善非加固隧道节段的性能和耐久性方面的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.