To investigate the internal force and deformation response law and reinforcement effect of a shield tunnel reinforced by channel steel in a pit excavation, a self-developed “hydraulic loading system” is used to conduct a full-size test and numerical simulation analysis on a three-ring staggered-seam assembled tube sheet. The results show that the internal force response of the tube sheet on the excavation side of the pit is complex and sensitive, the internal force is transformed in the direction under different load levels, and the bearing capacity can be effectively increased by 62.5 % through the channel steel reinforcement; the channel steel fails due to weld cracking, and the nonstructural bonding surface is damaged by sliding; and the maximum reinforcing efficiency of the combination of the channel steel and steel plate reaches 45.8 %, making it an economical and reliable reinforcing program.

中文翻译：

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边坑开挖槽钢加固盾构隧道耦合机理及加固效果研究


为研究基坑开挖槽钢加固盾构隧道的内力、变形响应规律及加固效果，采用自主研发的“液压加载系统”对三座隧道进行了全尺寸试验和数值模拟分析。 -环形交缝组装管板。结果表明，基坑开挖侧管板内力响应复杂、敏感，在不同荷载水平下内力发生方向转化，通过槽钢加固；槽钢因焊缝开裂而失效，非结构结合面因滑动而损坏；槽钢与钢板组合的最大加固效率达到45.8%，是一种经济可靠的加固方案。