摘要
针对深圳地铁新建隧道邻接既有桩基的地铁工程 ,进行了三维有限元数值模拟的施工力学行为研究。研究结果表明 :与无桩情况相比较 ,邻接桩基施工将引起新建隧道自身结构 ,特别是与既有桩基邻接一侧边墙不利的受力状况和变形特征 ;并且 ,邻接施工还将引起既有桩基产生偏向隧道水平方向的“拉伸”变形情况。因此 ,需要采取加固措施 ,以确保隧道自身结构以及邻接地下“建筑物”的安全。此外 ,考察不同刚度折减系数时 ,发现桩基水平侧向变形几乎没有变化 ,这表明改变盾构管片的拼装方式 ,在整体上对邻接地下“建筑物”
In the paper, the mechanical behaviour of a metro tunnel construction adjacent to existing pile foundation in Shenzhen is studied with 3D FEM numerical simulation method. Comparing with the case of no pile foundation,the disadvantageous distribution of deformation and internal forces in the tunnel structure are demonstrated,particularly in its side wall adjacent to the existing pile foundation. In addition, the tunnel construction results in also the tensile deformation in the existing pile foundation. Therefore, it is necessary to take some reinforcing measures to guarantee safety of the tunnel itself and the adjacent existing pile foundation. Finally, based on analysis of deformation using different stiffness reduction coefficients, it is found that the tensile deformation values hardly change,because different assembling patterns of tunnel lining segments have little effects on the adjacent existing pile foundations.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2003年第2期204-207,共4页
Chinese Journal of Geotechnical Engineering
关键词
地铁隧道
桩基
施工
力学
new made tunnel
close space construction
existing pile foundation
