北京交通大学学报2012，Vol.36Issue(1)：41-47,7.
大断面黄土隧道初期支护合理施作时机
Study on construction time of initial support in loess tunnel of large sections
摘要
Abstract
The rational design of supporting structure is the key to the design of large section loess tunnel , focusing on a loess railway tunnel in construction, this paper analyses the change situations of the loess tunnel supporting structure, rock stress state and mechanical behavior under the different construction times of initial support by numerical simulation. Centering on the controlling of the rock deformation, a reasonable proposal for construction time of initial support is given. And the force law of loess tunnel initial support is also summed up with the outcomes of field monitoring. Loess has a significant rheological property. A large part of the force acting on the supporting structure is caused by the additional load generated by rock rheology. In addition, the force of supporting structure is not evenly distributed and symmetrical in the space, which should be considered in the design.关键词
黄土隧道/数值模拟/支护时机/现场监测Key words
loess tunnel/ numerical simulation/ construction time/ field monitoring分类
交通工程引用本文复制引用
周烨,李鹏飞,张翾..大断面黄土隧道初期支护合理施作时机[J].北京交通大学学报,2012,36(1):41-47,7.基金项目
铁道部科技研究开发计划项目资助(2009G005-B) （2009G005-B）
