摘要
钢板加固为盾构常用的加固方法,但是目前对钢板与管片黏结面作用机制认识不足,导致钢板加固设计盲目性较强。为此,采用ABAQUS软件中的cohesive单元和trace单元来模拟钢板加固及黏结面损伤行为,建立可反映钢板-管片黏结面损伤特征的钢板加固衬砌三维实体非线性模型,并通过模型试验验证其合理性。结合数值计算和理论分析,揭示外荷载作用下钢板-混凝土黏结面的作用机制,定量分析加固参数对黏钢加固效果的影响,提炼钢板加固效果的关键影响因素。研究结果表明:当钢板-混凝土黏结面出现损伤时,结构承载能力损失65%以上;当黏结损伤区域面积占比超过8%时,结构承载能力损失80%以上并且承载力急剧减小;当黏结损伤区域面积占比超过56%时,结构基本丧失承载能力。加固结构的承载能力对钢板厚度最敏感,抗剪黏结强度次之;加固结构的延性对抗剪黏结强度最敏感,钢板厚度次之;钢板厚度和抗剪黏结强度对加固结构各项性能的综合影响最大,应作为钢板加固设计关键参数。
Steel bonding reinforcement has become a commonly used reinforcement method for shield tunneling.However,the mechanism of bonding surface between steel bonding and segment is not well understood at present,leading to strong blindness in reinforcement design.Therefore,cohesive elements and trace elements in ABAQUS were used to simulate the steel plate reinforcement and bonding surface damage behavior,and a three-dimensional solid nonlinear model of steel plate reinforcement lining was established,which can reflect the damage characteristics of steel plate and segment bonding surface,and its rationality was verified by model test results.Five evaluation indexes of steel plate reinforcement effect for shield tunnel were proposed.Combined with numerical calculation and theoretical analysis,the mechanism of steel-concrete bonding surface under external load was revealed,the influence of reinforcement parameters on the reinforcement effect of bonded steel was quantitatively analyzed,and the key influencing factors of the reinforcement effect of bonded steel were extracted.The results show that when the steel plate−concrete bonding surface is damaged,the bearing capacity of the structure loses more than 65%.When the bonding damage area accounts for more than 8%,the bearing capacity of the structure loses more than 80%and the bearing capacity decreases sharply.When the proportion of adhesive damage area exceeds 56%,the structure basically loses its bearing capacity.The bearing capacity of the reinforced structure is the most sensitive to the thickness of the steel plate,followed by the shear bond strength.The ductility of reinforced structures is the most sensitive to shear bonding strength,followed by the thickness of steel plates.The composite influence of steel plate thickness and shear bond strength on the properties of reinforced structure is the most and should be taken as the key parameters of steel plate reinforcement design.
作者
刘学增
李振
杨芝璐
LIU Xuezeng;LI Zhen;YANG Zhilu(Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Shanghai Engineering Research Center of Underground Infrastructure Detection and Maintenance Equipment,Shanghai 200092,China;Tongyan Civil Engineering Technology Co.Ltd.,Shanghai 200092,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第10期3987-3999,共13页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52278409)。
关键词
盾构隧道工程
钢板加固
黏结面
评价指标
敏感性
shield tunnel engineering
steel plate reinforcement
bonding surface
evaluation index
sensitivity
