管片锈裂对盾构隧道结构承载性能的影响  

Influence of Segment Rust Crack on Bearing Performance of Shield Tunnel Structure

作　　者：孙博旭 金浩 余朔 Sun Boxu;Jin Hao;Yu Shuo(School of Transportation,Southeast University,Nanjing 211189,P.R.China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,P.R.China)

机构地区：[1]东南大学交通学院,南京211189 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122

出　　处：《地下空间与工程学报》2024年第S01期148-154,162,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51908428);江苏省自然科学基金(BK20211173)。

摘　　要：管片作为盾构隧道结构主要的受力构件,其内部钢筋锈蚀会导致局部性能退化,影响盾构隧道结构的力学性能,从而危及地铁运营安全。本文构建了盾构隧道结构计算模型,并通过盾构隧道足尺实验验证了计算模型的准确性。在此基础上,研究了钢筋锈蚀作用对通缝拼装盾构隧道结构承载性能的影响。结果表明:随着管片内部钢筋锈蚀程度的增加,混凝土损伤范围逐渐增加;管片内部钢筋的锈蚀导致盾构隧道结构抵抗变形能力下降,使得管片间纵缝张开量增加;管片内钢筋锈蚀对不同通缝拼装盾构隧道结构的影响不同,封顶块偏转角度越大,钢筋锈裂引起的纵缝张开量越大。The primary structural components of the shield tunnel are its segments,and the corrosion of internal steel reinforcement significantly affects the mechanical properties of the shield tunnel structure.Steel bar rust swelling and corrosion will not only cause local performance to suffer,but may even put the safety of subway operation in jeopardy.In this study,a computation model of the shield tunnel's structural details is built,and the model's accuracy is checked using a full-scale shield tunnel experiment.Based on this,it is investigated how steel bar corrosion affects shield tunnel structures with various through-joint assembly forms'ability to carry loads.The main conclusions include:1.The degree of corrosion of steel bars has a significant impact on the tensile strength damage of segments,and the damage range increases with time;2.With time,longitudinal joints between segments become more porous;the size of the opening increases with time;3.When the capping block is directly above,it is the least favorable for lateral convergence of the shield structure,and the larger the deflection.

关 键 词：地铁 盾构隧道 钢筋锈蚀 管片损伤 承载性能 

分 类 号：U231[交通运输工程—道路与铁道工程]