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卸载下超高性能混凝土加固盾构隧道数值模拟

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为探究旁侧基坑开挖卸载扰动下超高性能混凝土(UHPC)加固盾构隧道的受力变形特征,采用MIDAS GTS NX软件构建盾构管片三维精细化有限元模型,通过管片加固前后的收敛变形、螺栓应力、管片塑性变形等依据来评估UHPC对管片的加固效果.研究表明UHPC加固对管片顶底收敛变形起有效限制作用,UHPC加固能够提高结构整体受力性能,且最大加固效率达50%;UHPC加固管片后,单环管片内邻接块与标准块间剪切作用的影响得到有效降低,管片接缝处变形受到限制;UHPC加固前后,管片塑性发展敏感区主要分布于左右腰部,可对这些位置采取局部加强措施.
NUMERICAL SIMULATION OF ULTRA-HIGH PERFORMANCE CONCRETE REINFORCED SHIELD TUNNEL UNDER UNLOADING CONDITIONS
In order to investigate the force and deformation characteristics of ultra-high performance concrete(UH-PC)reinforced shield tunnels under the unloading disturbance of side pit excavation,MIDAS GTS NX software is used to construct a three-dimensional refined finite element model of the shield tubular sheet,and the convergence deformation of the tubular sheet before and after reinforcing the tubular sheet,the bolt stress,and the plastic defor-mation of the tubular sheet are used to evaluate the reinforcing effect of UHPC on the tubular sheet.The study shows that UHPC reinforcement effectively restricts the convergence deformation of the top and bottom of the tube sheet.UHPC reinforcement improves the overall structural stress performance,and the maximum reinforcement efficiency reaches 50%.After UHPC reinforcement of the tube sheet,the impact of shear action between the adjacent blocks in-side the single-ring pipe section has been effectively reduced,and the deformation at the joints of the tube sheet is restricted.Before and after UHPC reinforcement,the sensitive area of the tube sheet's plastic development is mainly located in the left and right waists,and local reinforcement measures can be taken in these locations.Local strength-ening measures can be taken for these positions.

shield tunnelUHPC reinforcementtop bottom convergenceplastic deformation

李鑫、魏纲、徐天宝、林双燕

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浙大城市学院土木工程系,杭州 310015

安徽理工大学土木建筑学院,安徽淮南 232001

盾构隧道 UHPC加固 顶底收敛 塑性变形

浙江省基础公益研究计划项目国家级大学生创新创业训练计划项目

LGF22E080012202313021020

2024

低温建筑技术
黑龙江省寒地建筑科学研究院

低温建筑技术

影响因子:0.237
ISSN:1001-6864
年,卷(期):2024.46(2)
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