带接头盒矩形盾构接头正向抗弯三维有限元分析  

3D FEM Analysis of the Positive Bending Capacity for Rectangular Shield Tunnel Segment Joints with a Connector Box

作　　者：马国民[1] 丁文其[2,3] 魏于量 姜弘 金跃郎 MA Guomin;DING Wenqi;WEI Yuliang;JIANG Hong;JIN Yuelang(School of Highway,Chang＇an University,Xi＇an 710064;Department of Geotechnical Engineering,Tongji University,Shanghai 200092;Key Laboratory of Geotechnical and Underground Engineering,Ministry of Education,Tongji University,Shanghai 200092;Shanghai Urban Construction Design ＆ Research Institute,Shanghai 200011)

机构地区：[1]长安大学公路学院,西安710064 [2]同济大学土木工程学院地下建筑与工程系,上海200092 [3]同济大学岩土及地下工程教育部重点实验室,上海200092 [4]上海市城市建设设计研究总院,上海200011

出　　处：《现代隧道技术》2018年第4期122-131,共10页Modern Tunnelling Technology

基　　金：国家自然科学基金面上项目(51378388);上海市科委项目(15DZ1204003;15XD1522500;17DZ2251900)

摘　　要：大弯矩小轴力的内力工况对大断面矩形盾构管片接头的构造设计提出了挑战。接头盒作为一种接头预埋件,其合理设计以及与混凝土共同受力机理值得研究。在梁-弹簧模型中接头抗弯转动弹簧刚度值具有明显的非线性,目前主要依靠足尺管片接头力学试验获取。鉴于数值模拟容易开展,同时基于某大断面盾构管片接头足尺抗弯力学试验数据,文章采用ABAQUS大型有限元软件建立了带有接头盒矩形盾构管片纵缝接头的三维精细化计算模型。针对这类带有接头盒的大断面盾构管片接头,重点考查在正弯矩工况下接头构造设计的合理性,研究轴力对接头正向抗弯性能的影响,分析接头的破坏形态。结果表明,正弯矩工况下接头的弯矩-转角全过程曲线可以简化为三折线模型;在一定范围内,轴力的施加可有效推迟管片接头进入塑性以及破坏阶段,而对各阶段抗弯刚度的数值影响并不明显。Abstract A large bending moment with a small： axial force brings big challenges to the structural design of large-section rectangular segment joints. As one kind of embedded part, the connector box＇s design and mechanical mech-anism should be studied since the force is also shared by the concrete. As for a beam-spring model, the bending resistance rotational spring stiffness presents obvious nonlinear behavior and is presently acquired mainly by fullscale mechanical tests of the segment joint. Because of the convenience of FEM simulation, a fined 3D calculation model of the rectangular shield tunnel segment＇s longitudinal joint with a connector box was established by ABAQUS based on the mechanical test data. The rationality of the joint structure design was reviewed under the pos- itive moment, the influence of the axial force on the positive bending capacity of the segment joint was studied and the segment joint failure mode was analyzed. The results show that the bending moment-rotation curve can be simplified as a triple-line model; in a certain range, the axial force can effectively delay the plastic and destructive processes of the segment joints while it has little influence on the numerical-values of the bending stiffness at different stages.

关 键 词：大断面矩形盾构 管片接头 接头盒 ABAQUS 转动刚度 三维精细化有限元模型 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]