大直径盾构隧道纵向刚度增强措施研究  

Study on Longitudinal Stiffness Enhancement Measures of Large Diameter Shield Tunnel

作　　者：叶飞[1] 李思翰 刘畅 温小宝 韩兴博[1] Ye Fei;Li Sihan;Liu Chang;Wen Xiaobao;Han Xingbo(School of Highway,Chang'an University,Xi'an 710064,P.R.China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610000,P.R.China)

机构地区：[1]长安大学公路学院,西安710064 [2]西南交通大学土木工程学院,成都610031

出　　处：《地下空间与工程学报》2024年第3期959-968,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51878060,52108360);中铁第一勘察设计院集团有限公司科研开发项目(院科20-21)。

摘　　要：为研究不同环缝接头结构对盾构隧道纵向刚度的增强效果,采用等效连续化模型计算得到断面直径对隧道纵向拉压、纵向抗剪和纵向抗弯刚度的影响规律,将隧道纵向刚度增强措施与管片环缝接头结构相联系,采用数值模拟深入探究了9种环缝接头结构的力学性能,对比得到增强隧道纵向刚度效果最优的环缝接头结构。结果表明:直径对纵向拉压和纵向抗弯刚度影响较小,对纵向抗剪刚度影响较大;环缝接头刚度增强措施能够显著减小管片位移,提高隧道纵向刚度,提升效果为:斜螺栓>弯螺栓,定位榫>剪力销>凹凸榫;螺栓型式和纵向刚度增强措施均对螺栓最大剪切应力有较大影响,竖向荷载下受螺栓型式影响较大,水平向荷载下受管片环缝接头刚度增强措施影响较大;结合经济性和有效性,当接头螺栓为弯螺栓时,设置定位榫是一种相对较优的选择。In order to study the enhancement effect of different annular joint structures on the longitudinal stiffness of shield tunnel,the influences of section diameter on the longitudinal tension and compression,longitudinal shear and longitudinal bending stiffness of tunnel are calculated by equivalent continuous model.The longitudinal stiffness enhancement measures are related to the annular joint structure of segment.Additionally,the mechanical properties of nine annular joint structures are deeply explored by numerical simulation,and the annular joint structure with the best effect of enhancing the tunnel longitudinal stiffness is obtained by comparison.The results show that the diameter has little effect on the longitudinal tension and compression and longitudinal bending stiffness,but has a great influence on the longitudinal shear stiffness.The stiffness enhancement measures of the circumferential joint can significantly reduce the displacement of the segment and improve the tunnel longitudinal stiffness.The enhancement effect is:oblique bolt>bend bolt,positioning tenon>shear pin>concave tenon;at the same time,both the bolt type and the longitudinal stiffness enhancement measures have a great influence on the maximum shear stress of the bolt.The shear stress of the bolt is significantly influenced by the bolt type at vertical load and is significantly influenced by the longitudinal stiffness enhancement measures at horizontal load.Combining economy and effectiveness,when the joint bolt is a curved bolt,setting the positioning tenon is a relatively better choice.

关 键 词：大直径盾构 纵向刚度 管片环缝接头 刚度增强措施 

分 类 号：U451[建筑科学—桥梁与隧道工程]