摘要
为研究矩形顶管F型承插接头抗剪刚度等抗剪力学特性,建立精细化三维有限元模型,通过分析不同剪切位移下接头构件的力学特征,对接头抗剪刚度及影响抗剪刚度的因素进行研究。结果表明:1)矩形顶管F型承插接头的抗剪刚度呈非线性特征,分为3个阶段。当接头错台量小于7.6 mm时,接头抗剪刚度基本不变;接头错台量为7.6~22.29 mm时,接头的抗剪刚度降低为30%;接头错台量超过22.29 mm时,接头达到屈服荷载,接头抗剪刚度基本为0。2)接头的破坏过程为接头倒角部位钢套环先屈服,之后接头倒角部位混凝土发生受压破坏,最后范围逐渐扩大形成整个破坏面;接头发生剪切错台变化时,倒角部位钢套环及端部混凝土承担大部分剪切荷载,易发生破坏,应对此位置重点加强。3)接头钢套环厚度和长度、倒角半径、管片厚度的增加均会提高接头抗剪刚度,其中管片厚度对接头抗剪刚度的影响最大。
To study the shear stiffness characteristics of rectangular pipe jacking F-type socket joint,a refined threedimensional finite element model is established.By analyzing the mechanical characteristics of joint members under different shear displacements,the shear stiffness of joint and the factors influencing the shear stiffness are studied.The results show the following:(1)The shear stiffness of F-type socket joint in rectangular pipe jacking tunnel is nonlinear,which can be divided into three stages,i.e.,when the dislocation amount is less than 7.6 mm,the shear stiffness of the joint is basically unchanged;when that is 7.6~22.29 mm,the shear stiffness of the joint is reduced to 30%;and when that is more than 22.29 mm,the joint reaches yield load,and the shear stiffness of the joint is basically 0.(2)First,the shear failure occurs to the steel collar of joint inverted triangle area,then compressive failure occurs to the concrete of joint inverted triangle area,and finally a failure surface is formed.The steel collar and concrete of joint inverted triangle area bear most of the shear force when joint dislocates,which is prone to failure and should be strengthened.(3)The shear stiffness increases with an increase in thickness and length of steel collar,chamfer radius,coefficient of foundation bed,and wall thickness,and the wall thickness has a most significant effect on joint stiffness.
作者
许有俊
董文秀
裴学军
XU Youjun;DONG Wenxiu;PEI Xuejun(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;Academician Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2021年第S02期84-91,共8页
Tunnel Construction
基金
国家自然科学基金(51868062)。
关键词
矩形顶管
F型承插接头
剪力
剪切变形
抗剪刚度
rectangular pipe jacking
F-type socket joint
shear force
shear deformation
shear stiffness
