摘要
在地铁线路施工组织筹划中,一般先施工车站,后施工区间隧道。当地铁车站基坑开挖晚于相邻矿山法区间隧道施工时,车站基坑支护结构背后土体脱空,将导致支护结构受力形态发生变化,须对支护体系的安全性、稳定性进行计算分析。基于此,文章以西安地区某地铁项目为研究背景,对先隧后站的施工工况进行了理论计算及有限元分析,得出采取在支护结构背后设置反力支撑的措施可以有效地减小支护结构内力,并可以保证基坑支护结构的安全性及稳定性的结论,可为类似工程提供一定的参考和借鉴。
In the construction organization and planning of subway lines, the station is generally constructed before the section tunnel. When the excavation of the foundation pit in the railway station is later than the construction of the adjacent section tunnel by mine tunneling method, the soil behind the supporting structure of the station foundation pit will become void, which will lead to the change of the stress form of the supporting structure. The safety and stability of the supporting system must be calculated and analyzed. Based on this, this paper takes a subway project in Xi’an as the research background, and conducts theoretical calculation and finite element analysis on the construction conditions of the tunnel before station. It is concluded that the measures of setting counterforce support behind the supporting structure can effectively reduce the internal force of the supporting structure and ensure the safety and stability of the foundation pit supporting structure, which can provide some reference for similar projects.
作者
夏冬
侯石悦
XIA Dong;HOU Shiyue(Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,Guangdong,China)
出处
《工程技术研究》
2023年第3期10-13,共4页
Engineering and Technological Research
关键词
先隧后站
隧道施工
基坑支护
土体脱空
支撑轴力
tunnel before station
tunnel construction
foundation pit support
soil void
support axial force
