摘要
重庆轨道交通5号线3标段浅埋扁平超大断面隧道采用双侧壁导坑法开挖。对施工过程进行了数值模拟,并结合现场监测结果对各施工阶段围岩的稳定性进行分析。结果表明:扁平超大断面隧道拱顶受力面积大,受力部位下移,拱脚应力集中;拆除中隔墙时拱顶沉降幅度大,拱脚水平收敛对开挖过程较敏感;开挖完成时隧道仰拱隆起,应当及时封闭成环。
Shallow buried flat super large section tunnel in section 3 of Chongqing rail transit line 5 was excavated with both side drift method.Numerical simulation of the construction process was carried out,and the stability of surrounding rock in each construction stage was analyzed by combining with the on-site monitoring results.The results show that bearing area of the vault of flat super large section tunnel is large,the force-bearing part moves down,the stress concentrates at arch foot,the settlement amplitude of the vault is large when the mid-partition wall is removed,the horizontal convergence of the arch foot is more sensitive to the excavation process,and tunnel invert arch bulges when excavation is completed,which should be closed as a ring in time.
作者
金星亮
胡曦波
JIN Xingliang;HU Xibo(Survey,Design and Research Institute,China Railway Tunnel Group Co.Ltd.,Guangzhou Guangdong 511455,China;China Railway Chongqing Subway Construction Headquarters,Chongqing 401120,China)
出处
《铁道建筑》
北大核心
2018年第11期74-77,共4页
Railway Engineering
关键词
地铁
围岩稳定性
数值分析
现场测试
超大断面隧道
施工阶段
Subway
Surrounding rock stability
Numerical analysis
Field test
Super large section tunnel
Construction stage
