摘要
基于长沙轨道1号线隧道上方的某地下空间开发工程案例,通过Plaxis 3D有限元软件对基坑开挖引起下方隧道结构变形以及管片内力进行数值模拟分析,研究每一开挖工况下隧道结构的变形以及管片结构的内力,并据此提出合理的分仓开挖宽度等施工措施。得出在此类基坑中,减小基坑一次性开挖暴露的隧道长度对减小下卧隧道的隆起量至关重要,并详述分仓开挖后基坑以及盾构区间的变形形态。
Based on the foundation pit excavation above the existing subway tunnel of Changsha Metro Line 1,numerical simulation of the deformation and internal forces of the tunnel structure caused by foundation pit excavation is conducted with Plaxis 3 D finite element software. Reasonable working procedures are put forward accordingly to the above analysis. It is concluded that for this kind offoundation pit,reducing the exposed tunnel length after one-off excavation of the foundation pit plays an important role in decreasing the amount of the tunnel uplift. The deformation patterns of foundation pit and shield section are discussed in detail.
作者
曹前
CAO Qian(Changsha Metro Group Co., Ltd.,Changsha 410000, China)
出处
《铁道标准设计》
北大核心
2018年第5期109-115,共7页
Railway Standard Design
关键词
既有地铁隧道
基坑开挖
隆起变形
止水帷幕
Existing subway tunnel
Foundation pit excavation
Uplift deformation
Water-resisting curtain
