新型矩形盾构接头力学性态的有限元分析  

Finite Element Analysis of Mechanical Behavior for New Type of Segment Joints of Rectangular Shield Tunnel

作　　者：魏于量 丁文其[1,2] 金跃郎 龚琛杰 姜弘 

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 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海市城市建设设计研究总院,上海200125

出　　处：《隧道建设》2017年第10期1309-1316,共8页Tunnel Construction

基　　金：国家自然科学基金资助项目(51378388);上海市科委项目(15XD1522500;16DZ1201701;17DZ1203402)

摘　　要：为分析评价带有接头盒的大断面矩形盾构管片接头构造和受力的合理性,基于管片纵缝接头足尺力学试验的结果,采用ABAQUS有限元软件建立该类盾构管片纵缝接头的三维精细化计算模型。通过一些分析指标,定性定量地评价在正常使用条件下各个接头的工作性态,研究正负弯矩工况下接头受力全过程的特征。结果表明:1)正弯矩工况下的接头,弯矩-转角全过程破坏曲线呈现三折线模式,在正常使用条件下各接头均处于第2阶段,转动刚度约为100 MN·m/rad,部件均处于弹性工况,接头设计与位置选择合理;2)负弯矩工况下的接头,弯矩-转角全过程破坏曲线呈现双折线模式,正常使用工况下各接头均处于第1阶段,转动刚度约为276 MN·m/rad,但接头受力处于2阶段的临界位置,所受负弯矩值偏大,安全储备较低,设计时应当注意。A fined 3D calculation model of longitudinal joints of large cross-section rectangular shield tunnel with embedded parts is established by finite element software ABAQUS based on full-scale mechanical testing results,so as to analyze and estimate the rationality of the segment joint structure and stressing. The working states of every joint under normal operating conditions are estimated qualitatively and quantitatively; and then the stressing characteristics of joint under positive and negative bending moment are studied. The results show that: 1) The bending moment-rotation angle curve of the segment presents a three-fold line mode under positive bending moment. The joints are in the second stage under normal operating condition,where the rotational stiffness is about 100 MN · m/rad; the components are all in elastic condition and the design and location of the joints are rational. 2) The bending moment-rotation angle curve of the segment presents a double-fold line mode under negative bending moment. The joints are all in the first stage under normal operating condition,where the rotational stiffness is about 276 MN · m/rad. However,the negative bending moment is quite large and the safety stiffness is low,which should be paid more attentions to in design.

关 键 词：矩形盾构管片接头 力学性态 三维精细化有限元模型 

分 类 号：U45[建筑科学—桥梁与隧道工程]