摘要
结合某联拱隧道现场监测,利用隧道专用软件同济曙光,对联拱隧道施工进行了数值模拟。结果表明:台阶环向土开挖较台阶开挖安全;主洞上下台阶不同步开挖施工是较为合理的施工方案,且模拟和现场测试结果表明按此施工所产生的偏压在允许范围内;而洞周位移数值模拟结果较监测结果偏大,但在允许范围内;洞周位移黏弹性分析表明,隧道在开挖46 d后,其围岩已经稳定,可以进行二次衬砌。
In this paper, the dynamical FEM （GeoFBA-V3.0） software was applied to simulate the construction of the hi-arch tunnel combining the monitoring. The results showed that the surrounding excavation is safer than stairs excavation and excavation out of sync between top and bottom stairs is more reasonable than synchronization excavation. Moreover, the simulation and the monitoring showed that the deviation of pressure caused by construction is within allowing range. The simulating surrounding displacement is slightly larger than the monitoring, but it is within allowing range. The visco-elastie analysis about surrounding displacement showed that the surrounding rock of the tunnel will become stability after 46 days and the second support to the surrounding rock of the tunnel can be made.
出处
《交通科技》
2008年第6期18-21,共4页
Transportation Science & Technology
基金
国家自然科学基金资助项目(10372074)
湖北省交通科技项目(03-66-3/4)
关键词
联拱隧道
数值模拟
稳定性
黏弹性
bi-arch tunnel
numerical simulation
stability
viscoelasticity
