基于独立覆盖等几何壳的盾构隧道虚拟接头试验方法研究  

Research on Virtual Joint Test Method of Shield Tunnels Based on Independent Cover Isogeometric Shell Model

作　　者：陈景煦 蔡永昌[1] CHEN Jingxu CAI Yongchang(Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092)

机构地区：[1]同济大学土木工程学院地下建筑与工程系,上海200092

出　　处：《现代隧道技术》2023年第2期22-27,37,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金(51778473)。

摘　　要：针对工程类比、物理试验、数值模拟在深埋、大断面、异形盾构隧道接头抗弯刚度获取与性能研究时的局限,建立了基于独立覆盖等几何壳的虚拟接头试验方法与平台。研究讨论了虚拟试验实现的关键理论、算法与技术,对照物理试验分析了虚拟试验的可行性与优势,并采用虚拟试验分析了某大断面深埋隧洞的接头抗弯性能及其影响因素。研究结果表明:在虚拟试验平台中输入非敏感参数即可获得与物理试验吻合的接头抗弯曲线,其计算代价仅约为实体有限元模型的0.75%;在研究范围内,大断面深埋隧道接头刚度取值范围为2.98×10^(5)~2.57×10^(6)kN·m/rad,接头刚度随管片变形缝长度增大而明显减小。To address the limitations of engineering analogy,physical tests,and numerical simulations in the bending stiffness acquisition and performance study of deep-buried,large-section,and irregular-shaped shield tunnel joints,this paper establishes a virtual joint test method and platform based on independent cover isogeometric shell models.The study discusses the key theories,algorithms and techniques to realize the virtual tests,analyzes the fea⁃sibility and advantages of virtual tests against physical tests,and uses virtual tests to analyze the joint bending resis⁃tance of a large-section deep-buried tunnel and its influencing factors.The results show that joint bending resis⁃tance curves that match physical tests can be obtained by inputting non-sensitive parameters in the virtual test plat⁃form,and the computation cost is only about 0.75%of the solid finite element model.Within the range of the study,the joint stiffness of large-section deep-buried tunnels is valued in the range of 2.98×10^(5)~2.57×10^(6) kN·m/rad,and the joint stiffness decreases significantly with the increase of the deformation joint length of the segment.

关 键 词：盾构隧道 抗弯刚度 数值计算 接头 等几何分析 虚拟试验 

分 类 号：U456[建筑科学—桥梁与隧道工程]