摘要
针对隧道施工过程中的围岩稳定性问题,运用FLAC软件比较分析了未采用衬砌与采用衬砌加固两种工况下隧道围岩的应力分布与变形规律。数值计算中采用摩尔-库仑弹塑性模型,隧道衬砌与周边岩体之间的接触面采用接触单元。结果发现,未采用衬砌加固措施前,隧道周边岩体变形较大,隧道硐室出现大规模的垮塌现象;经过混凝土衬砌加固之后,岩体变形显著减小。此研究对隧道的开挖与衬砌结构的施工提供重要参考价值。
In order to analyze the stability problem of surrounding rock during tunnel construction process, the stress distri- bution and deformation law of tunnel surrounding rock with lining and without lining are analyzed with FLAC. Mohr-Cou- lomb elastoplastic model numerical calculation is used, and the contact surface between the tunnel lining and the surround- ing rock mass is contact unit. Based on the result, the deformation of tunnel rock is obvious before using lining, accompa- nied by large-scale collapse of tunnel chamber. The deformation is significantly reduced by using lining. This study pro- vides an important reference for the tunnel excavation and lining structure construction.
出处
《铁道建筑技术》
2013年第5期62-64,81,共4页
Railway Construction Technology
关键词
隧道
岩体变形
衬砌结构
数值模拟
tunnel
rock deformation
lining
numerical simulation
