摘要
针对目前在建的青藏铁路工程———世界第一高隧风火山隧道,探讨了围岩冻胀对隧道支护结构体系的影响,给出了隧道围岩冻胀力的弹性解;根据风火山隧道岩层地质条件,分析了寒区隧道支护结构的力学性能,得到了不同围岩完整度情况下,随着冻融圈厚度的变化,衬砌刚度不同、厚度不同时冻胀力的分布规律,确立了高海拔寒区隧道围岩冻胀对支护结构体系的影响;同时在明确冻土隧道冻害概念基础上,提出了减弱围岩冻胀对支护结构体系影响的有效措施。
Based on the constuction of Fenghuoshan railway tunnel, the effect of frost forces on tunnel surpporting system in cold region is discussed. First, the elastic fomula of the frost force is given. Second,according to geological condition of rock surrounding Fenghuoshan railway tunnel, the mechanical properties of tunnel surpporting system in cold region are analyzed. And with the variation of integrity of rock,thickness and stiffness of lining, and thickness of active layer, the variation of frost force is determined. At last,based on the concept of frost damage of tunnel in cold region, some effective measures are proposed to alleviate the influence of the frost force on tunnel surpporting system in cold region.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2003年第5期571-573,共3页
Chinese Journal of Geotechnical Engineering
