摘要
根据相似理论,以曲墙式、直墙式和圆形衬砌为例,通过模型试验方法研究了寒区破碎岩体隧道在不同约束条件和冻结深度下衬砌所受法向冻胀力(以下简称冻胀力)的量值和分布规律.结果表明:冻结深度越大,冻胀力越大;顶端约束越强,冻胀力越大.对于曲墙式和直墙式衬砌,顶端约束对拱部和仰供处冻胀力影响较大,对边墙处冻胀力影响较小;对于圆形衬砌,顶端约束对整个衬砌所受冻胀力影响程度相差不大;直墙式衬砌受冻胀力的量值最大,圆形衬砌受冻胀力量值最小.对于3种衬砌结构,最大冻胀力均发生在仰供脚处.试验数据与现场测试数据基本吻合,说明试验有较好的准确性.
Base on the similarity theory,taking the horseshoe lining,city-gate lining and round lining for example,the value and distribution regularities of normal frost heaving pressures（hereinafter as frost heaving pressures） in tunnels excavated in fractured rock mass in cold regions under different constraints and frozen depths were studied by model test.It is found that the larger the frozen depth is,the larger the frost heaving pressure.The stronger the top constraint is,the larger the frost heaving pressure.For the horseshoe lining and city-gate lining,the top constraint has great effect on the frost heaving pressures on the arch and inverted arch.For the round lining,the influence of the top constraint on the frost heaving pressure in all lining is almost the same.The frost heaving pressure is the maximum on the city-gate lining and the minimum on the round lining.The largest frost heaving pressure all occurs near the foot of an invert arch for the three kinds of lining.The test data basically coincide with the data observed in situ.
出处
《冰川冻土》
CSCD
北大核心
2010年第3期557-561,共5页
Journal of Glaciology and Geocryology
基金
铁道部科技研究开发项目(2001G001-E-02)资助
关键词
寒区隧道
破碎围岩
冻胀力
模型试验
tunnel in cold region
fractured rock mass
frost heaving pressure
model test
