摘要
天河改造项目的地下商业区域的A区和B区连廊位于地铁隧道的正上方,原方案底板底距隧道顶的最小距离仅为3 m,并且土质条件较差,无疑底板下移施工对该地铁隧道影响的分析与计算成为该工程的关键之一。为此,建立了底板下移施工的数值分析模型,计算结果表明,连廊底板下移施工会对隧道顶塌落拱内的土体在垂直方向有明显的卸荷作用,会引起土体发生位移,导致隧道管片应力状态改变,使得隧道管片产生附件变形。同时,随着越来越多的类似工程的出现,本文可为优化设计和施工提供有益的参考。
The gallery connecting the area A and area B of underground-mall of Tian-he reconstruction project is located upon metro tunnels. The minimum distance between the bottom plate and the tunnels in former plan was 3m,with poor soil condition. Therefore,the shifting-down construction of the bottom plate has become one of key points in this project. We built up a numerical simulated model for shifting-down construction of the plate,and the result showed that there was obviously vertical unloading effect on soil upon the tunnels during construction. The construction surely caused deformation of the soil,tunnel displacement,and changes of stress state of tunnel segments. With more and more similar projects come out,we provide a good reference for optimization design and construction in this article.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第5期1248-1256,共9页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51378131)
广东省水利科技创新基金(2009-25)
广东省公路管理局科技基金(2012-09)
关键词
连廊
底板
管片
地铁隧道
数值仿真
gallery
bottom plate
tunnel segment
metro tunnel
numerical simulation
