摘要
为了研究盾构隧道接头部位的榫槽深度对盾构隧道承载性能的影响规律,考虑纵缝榫槽等结构的细部构造,建立三维精细化盾构隧道数值模型进行计算分析,并与足尺试验进行对比验证。结果表明试验及数值的数据基本吻合,采用该模型计算是合理可行的。研究结论:(1)正常承载及超载情况下截面弯矩和轴力对纵缝榫槽深度改变不敏感,当隧道结构遭遇极为严重的卸载情况时,截面弯矩和轴力才表现出随纵缝榫槽深度增加而增大;(2)卸载情况下不同纵缝榫槽深度对应的隧道结构横向、竖向收敛变形均显著大于超载情况;(3)增加纵缝榫槽深度可在一定程度上提高隧道结构抗变形能力,但当榫槽深度超过20 mm后,再增加榫槽深度对提高隧道结构承载力无明显效果。
In order to study the effect of tenon groove depth on the bearing capacity of shield tunnel,a three-dimensional fine numerical model of shield tunnel is established for calculation and analysis in consideration of the detailed structure of longitudinal joint tenon groove.The results show that the experimental and numerical data are in good agreement and the model is applicable.The conclusions are as follows:(1)Under normal load and overload conditions,bending moment and axial force are not sensitive to the change of longitudinal tenon groove depth.When the tunnel structure suffers extremely serious unloading,the bending moment and axial force increase with the increase of the longitudinal tenon groove depth.(2)Corresponding to different longitudinal tenon groove depth,the transverse and vertical convergent deformation of tunnel under unloading condition is significantly greater than that under overload condition.(3)To some extent,increasing the depth of tenon groove can improve the anti-deformation ability of the tunnel structure,but when the depth of tenon groove exceeds 20 mm,increasing the depth of tenon groove has no obvious effect on improving the bearing capacity.
作者
张伯林
郑军
张书丰
ZHANG Bolin;ZHENG Jun;ZHANG Shufeng(Nanjing Metro Group Co.,Ltd.,Nanjing 210018,China)
出处
《铁道标准设计》
北大核心
2020年第10期101-108,共8页
Railway Standard Design
关键词
榫槽深度
荷载变化
数值模型
足尺试验
隧道承载性能
tenon groove depth
load variation
numerical model
full scale test
tunnel bearing capacity
