摘要
管片接头是装配式盾构隧道的关键部分,其抗弯刚度对管片环的内力及整体性能均有重要的影响,使得接头抗弯刚度的取值显得尤为重要。本文以广州地铁盾构隧道使用的管片为研究对象,采用三维有限元法,利用通用有限元软件ADINA,在建立精细有限元模型的基础上,计算得到正负两方向及不同偏心距荷载下接头变形的特点和接头的抗弯刚度。从而可知,正弯曲刚度具有一定的非线性性质,线性回归得到的刚度量值为1236.7kN.m/rad;负弯曲刚度曲线为线性,线性回归得到的刚度量值为2295.1 kN.m/rad。接头刚度受接头内力组合的偏心距影响,偏心距越大,接头刚度越大。在接头的模拟计算中,有必要建立和实际相同的数值模型,从而避免各种误差。
Segment joints are the key components of the fabricated shield tunnel. The flexural rigidity of the joints has important effect on the internal force and integrated performance of the segment ring. Through the general finite element program ADINA, 3D FEM （Finite Element Method） was adopted to analyze and elaborate on the 3D numerical model of joints of the Guangzhou Metro shield tunnel. The results cover the flexural rigidity of positive and negative bending under different eccentricities. The positive bending behaves nonlinear, and the flexural rigidity is 1 236.7 kN ·m/rad; the negative bending behaves linear, and the flexural rigidity is 2 295.1 kN·m/rad. The flexural rigidity is affected by the eccentricity of the internal forces assembly. The larger the eccentricity, the stiffer the flexural rigidity. When simulating the mechanical behavior of segment joints, it is necessary to build a model that is the same with actual joints so as to avoid multiple tolerances.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2009年第4期87-91,共5页
Journal of the China Railway Society
关键词
盾构隧道
管片接头
抗弯刚度
三维有限元分析
shield tunnel
segment joint
flexural rigidity
3D finite element analysis
