摘要
为探究粘贴钢板(简称粘钢)加固盾构隧道衬砌的承载性能和破坏机理,基于上海实施的内张钢圈加固管片衬砌结构试验,建立三维实体精细有限元模型,讨论了通缝隧道衬砌粘钢加固后的力学行为、变形特性和破坏模式,验证了数值仿真手段的可靠性。在此基础上,对广州地铁1号线某区间错缝盾构隧道钢板加固案例展开模拟,评价加固效果。研究结果表明:精细有限元模型能较好地模拟钢板与管片衬砌的共同承载特性,真实反映接头等细部构造的变形及力学指标;粘贴钢板加固后衬砌结构破坏的直接原因是钢板与管片混凝土间环氧树脂黏结失效,呈现明显的脆性特征,常规变形监测难以起到预警作用,应着重关注钢圈与混凝土间黏结状态;某病害错缝盾构隧道进行粘贴钢板作业后承载力提升约59.0%,加固效果显著。研究成果可为相关隧道加固方案的设计与实施提供指导和参考。
To investigate the load-bearing behavior and failure mechanism of shield tunnel lining reinforced by bonded steel plate,a detailed 3Dfinite element model was established,on the basis of a structural test of segment lining reinforced by steel plates in Shanghai.The mechanical behavior,deformation characteristics and the failure mode of tunnel lining with straight joints strengthened by bonded steel were considered and discussed,and the reliability of numerical simulation was validated.Subsequently,taking a certain section of Guangzhou Metro Line 1as an example,the simulation of staggered-jointed shield tunnel strengthened by steel was carried out to evaluate the reinforcement effect.The results show that the detailed finite element model with properly simulating the load-bearing capacity of steel plates and segmental lining reflects the deformation and mechanical indices in detailed configuration of joints.The failure of lining structure after reinforcement results from the bonding failure of epoxy resin between the steelplates and the segment concrete.Conventional displacement monitoring fails to play an important role of early warning.Meanwhile,the bond interface between steel ring and concrete should be concerned to prevent brittle destruction.The ultimate capacity of a diseased staggered shield tunnel is improved remarkably by 59.0% after the reinforcement.The results can provide a reference for the corresponding reinforcement schemes of shield tunnel.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2017年第8期91-99,共9页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51678248)
华南理工大学亚热带建筑科学国家重点实验室自主研究课题(2016KB16
2017KB15)
关键词
盾构隧道
承载性能
数值仿真
管片衬砌
粘贴钢板
加固效果
shield tunnel
load-bearing capacity
numerical simulation
segmental lining
bonded steel plate
strengthening effect
