摘要
盾构隧道处于不对称荷载下或结构体系发生变化时(如隧道联络通道开孔等),环缝剪切对盾构隧道的结构响应影响增大,环间剪切效应将进一步影响结构的极限承载力。然而现有的模型对环缝接头进行了不同程度的简化,这给在此过程中对隧道内环间剪切分布进行全面细致分析带来了困难。为此,以接触原理为基础,建立一种“壳-接触”精细化模型,并与机械法联络通道主隧道开孔足尺试验结果对比,探明该过程的盾构隧道的环间剪切效应机理。研究结果表明:壳-接触模型采用“软接触”的方式,在保证可以模拟接头转动的前提下,也可以实现接头位置压力与剪切的耦合模拟,与实际环缝力学性质相符;在机械法联络通道开孔案例中,考虑摩擦损失的精细化模型结果对足尺实验结果模拟较好;开孔管片的环间剪切力以径向剪切力为主;结构体系发生变化时,环缝的剪切力不再满足自平衡现象;且环缝剪切力的突变位置均为纵缝的位置;环间的最大径向剪切力发生位置揭示了盾构隧道开孔后的“环间传力”方向:从开孔位置逐渐向顶部靠近并最终消失;在实际工程中,应关注环间最大剪切力移动方向,经济高效地对环间剪切进行加固,确保有效环间传力。研究成果补充了机械法联络通道盾构隧道中开孔后的环间剪切效应,可为易发生环间错台的盾构隧道工程给出指导建议。
In the event of an asymmetric loading of a shield tunnel or a modification to the structural system(such as a tunnel with cross passages opening),the impact of shear between rings on the structural response of the shield tunnel increases.Moreover,the effect of shear between rings exerts a considerable influence on the ultimate load-bearing capacity of the structure.However,the existing models have simplified the circumferential joints,which makes it challenging to conduct a comprehensive and detailed analysis of the shear distribution between rings during this process.To this end,an elaborate shell contact model was developed based on the contact principle and compared with the results of the full-scale tests on segmental lining with mechanically cut cross-passage openings.This can help ascertain the mechanism of shear effects between rings in this process.The results demonstrate that the“soft contact”methodology of the shell-contact model is an effective means of simulating joint rotation while concurrently coupling pressure and shear at joint locations.This aligns with the actual mechanical properties of the segment joints.In the case of shield tunnel with mechanical cross passages opening,the elaborate model results considering friction loss demonstrate a superior correlation with the results of full-scale experiments.Radial shear force is the predominant contributors to shear force between rings.Following the structural system changing(after opening),the shear force at the segment joints is no longer selfbalancing.There have been sudden fluctuations in shear force between rings at the longitudinal joints.The position of the maximum radial shear between rings provides insight into the direction of internal force transmission between rings:from the opening position to the top,and it gradually disappears.In the actual project,it is essential to consider the direction of the maximum shear force between rings to ensure effective internal force transmission.The study can provide insights into the shear effects between rings in shield tunnels with cross passages openings constructed by the mechanized method,offering guidance for shield tunnel projects with circumferential joints dislocations.
作者
高一民
柳献
RAMOS Gonzalo
TURMO Jose
朱瑶宏
GAO Yimin;LIU Xian;RAMOS Gonzalo;TURMO Jose;ZHU Yaohong(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Department of Civil and Environmental Engineering,Universitat Politècnica de Catalunya-BarcelonaTech(UPC),Barcelona 08034,Spain;Collaborative Innovation Center of Coastal Urban Rail Transit,Ningbo University,Ningbo 315211,China)
出处
《铁道科学与工程学报》
北大核心
2025年第5期2242-2256,共15页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(52078376)
宁波大学滨海城市轨道交通协同创新中心2022年度开放基金项目(XT2022005)。
关键词
盾构隧道
环间剪切效应
壳-接触模型
环间摩擦模拟
机械法联络通道
摩擦损失
环间传力
shield tunnel
shear effects between rings
shell contact model
friction simulation between rings
cross passages constructed by mechanized method
friction loss
internal force transmission between rings
