摘要
盾构隧道在长期运营中极易发生不均匀沉降及纵向结构变形,因而有必要建立隧道纵向结构计算模型,分析隧道纵向变形及内力特征。首先探讨隧道纵向变形模式,将隧道变形归纳为两种模式:(1)弯曲变形模式;(2)错台变形模式。其次针对现有纵向结构计算模型进行总结并分析其优缺点,根据模型的简化过程将现有模型归纳为两类:(1)纵向管片环-接头模型;(2)纵向等效连续化模型。针对隧道实际剪切错台变形的特点,重点介绍一种基于铁木辛柯梁理论的隧道纵向连续化模型,并通过实例分析其优越性。
Shield tunnels are often subjected to differential settlement and longitudinal structural deformation during long-term operation.In order to obtain the additional internal forces and joint deformation induced by longitudinal deformation,it is necessary to establish a longitudinal structural model.This paper investigates the deformation pattern of shield tunnel in longitudinal direction.The deformation patterns are divides into the following two types:a)bend mode;and b)dislocation mode.The existing longitudinal structural models are summarized and divided into the following two categories:a)segmental ring-spring model;and b)equivalent continuous model.The advantages and disadvantages of these models are discussed.An equivalent continuous model based on Timoshenko theory,which is able to consider the shearing dislocation of the tunnel,is highlighted.Based on a case study,the advantages of the Timoshenko simplified model are verified.
作者
陈拴
吴怀娜
沈水龙
陈仁朋
Chen Shuan;Wu Huaina;Shen Shuilong;Chen Renpeng(1.Hunan University,Changsha 410082,China;Shanghai Jiaotong University,Shanghai 200240,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2019年第A01期85-92,共8页
China Civil Engineering Journal
基金
国家自然科学基金(51508323,51878267)
