大直径盾构隧道新型接头预埋件抗拉力学性能试验研究

周子豪; 余俊杰; 曹凯; 龚琛杰; 闫治国

doi:10.19713/j.cnki.43-1423/u.T20251341

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大直径盾构隧道新型接头预埋件抗拉力学性能试验研究

桥梁隧道与结构 | 更新时间：2026-07-24

- 大直径盾构隧道新型接头预埋件抗拉力学性能试验研究
- Experimental study on tensile mechanical performance of novel embedded parts at segment joints of large-diameter shield tunnels
- 铁道科学与工程学报 2026年23卷第7期页码：3378-3390
- 作者机构：
  
  1.同济大学土木工程防灾减灾全国重点实验室，上海 200092
  2.同济大学地下建筑与工程系，上海 200092
  3.中南大学土木工程学院，湖南长沙 410075
- 作者简介：
  
  闫治国(1977—)，男，内蒙古兴和人，教授，博士，从事隧道及地下空防灾救援研究；E-mail：yanzguo@tongji.edu.cn
- 基金信息：
  
  国家重点研发计划项目(2023YFC3805700);湖南省教育厅优秀青年基金资助项目(24B0026)
- DOI：10.19713/j.cnki.43-1423/u.T20251341
  中图分类号： U452.2
- 收稿：2025-08-28，
  
  网络首发：2026-07-24，
  
  纸质出版：2026-07-28
- 稿件说明：
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周子豪,余俊杰,曹凯等.大直径盾构隧道新型接头预埋件抗拉力学性能试验研究[J].铁道科学与工程学报,2026,23(07):3378-3390.

ZHOU Zihao,YU Junjie,CAO Kai,et al.Experimental study on tensile mechanical performance of novel embedded parts at segment joints of large-diameter shield tunnels[J].Journal of Railway Science and Engineering,2026,23(07):3378-3390.
周子豪,余俊杰,曹凯等.大直径盾构隧道新型接头预埋件抗拉力学性能试验研究[J].铁道科学与工程学报,2026,23(07):3378-3390. DOI： 10.19713/j.cnki.43-1423/u.T20251341.

ZHOU Zihao,YU Junjie,CAO Kai,et al.Experimental study on tensile mechanical performance of novel embedded parts at segment joints of large-diameter shield tunnels[J].Journal of Railway Science and Engineering,2026,23(07):3378-3390. DOI： 10.19713/j.cnki.43-1423/u.T20251341.

摘要

为研究海太长江隧道新型接头预埋连接件(DDCI)的抗拉力学性能，明确不同材料对连接性能的影响，为预埋件材料选型和结构设计优化提供依据，选用45钢和Q690两种材料制备DDCI连接件，开展全尺寸接头轴拉试验、小变形循环轴拉试验及初始拼装错台条件下的轴拉试验。试验过程中监测接头张开量、错台量、锚筋应力及C型构件应变等参数，并对比分析预埋件的力学行为及破坏特征。结果表明：在全尺寸轴拉试验下，采用45钢预埋件的接头极限抗拉承载力为1 320 kN，最大张开量为17.5 mm；采用Q690预埋件的接头极限抗拉承载力提高至2 160 kN，最大张开量减小至5.97 mm，最终因C型构件脆性破坏而失效。小循环荷载作用后，DDCI连接件产生微小的残余应变，由45钢和Q690预埋件构成的接头极限抗拉承载力均有所提高，分别达到1 360 kN和2 460 kN，接头破坏呈渐进性(应力调整伴随声响-裂缝出现-裂缝扩展-锚筋拔出/断裂结构破坏)。当初始错台不超过2.8 mm时，DDCI接头的抗拉性能基本不受影响，错台在加载过程中逐渐恢复，破坏模式与全尺寸轴拉试验保持一致。采用高强度材料Q690制备的预埋件可显著提升DDCI接头的抗拉承载性能，小循环荷载作用有助于改善接头的应力分布并提高极限承载力。研究成果可为预埋件材料选型与结构设计优化提供工程参考。

Abstract

This study investigated the tensile mechanical behavior of a newly developed embedded connector (DDCI) for the Haitai Yangtze River Tunnel

aiming to clarify the influence of different materials on the connection performance and provide a basis for material selection and structural optimization of embedded components. DDCI connectors were fabricated using two materials

45 steel and Q690 high-strength steel. Full-scale axial tension tests

small-amplitude cyclic axial tension tests

and axial tension tests under initial assembly misalignment were conducted. During the tests

parameters such as joint opening

misalignment

reinforcement stress

and strain of the C-shaped component were monitored. The mechanical responses and failure characteristics of connectors using different embedded materials were compared and analyzed. Under full-scale axial tension

the joint fabricated with 45 steel embedded parts exhibited an ultimate tensile capacity of 1 320 kN and a maximum opening of 17.5 mm. In contrast

the joint with Q690 embedded parts achieved an ultimate tensile capacity of 2 160 kN and a reduced maximum opening of 5.97 mm

failing due to brittle fracture of the C-shaped component. After small cyclic loading

the DDCI connectors developed minor residual strain

and the ultimate tensile capacities increased to 1 360 kN and 2 460 kN

respectively

showing a progressive failure process (stress redistribution with acoustic emission-crack initiation-crack propagation-rebar pull-out or fracture). When the initial misalignment was within 2.8 mm

the tensile performance of the DDCI joint was essentially unaffected

with the misalignment gradually recovering during loading

and the failure mode remained consistent with that under full-scale axial tension. Using high-strength Q690 steel for the embedded parts significantly enhances the tensile capacity of DDCI joints. Small cyclic loading helps improve stress distribution and increase the ultimate load-bearing capacity. The results can provide valuable engineering references for the material selection and structural design optimization of embedded connectors.

关键词

Keywords

references

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