季节性冻土环境下混凝土短桩基础抗冻拔研究  

Research on Frozen and Uplift Resistant for Concrete Short Pile Foundation in Seasonal Frozen Soil Area

作　　者：刘霁[1] 李云[1] 谭德喜[1] 

机构地区：[1]湖南城市学院,湖南益阳413000

出　　处：《施工技术》2009年第1期81-82,共2页Construction Technology

基　　金：国家自然科学基金项目(50774092);全国优秀博士学位论文专项资金资助(200449)

摘　　要：结合寒冷地区某公园人工湖船台工程,通过现场试验,确定船台桩基切向冻胀力作用下的摩阻力值和上拔位移。对船台桩基采用刚性套筒或柔性套筒的抗冻拔方案建立试验船台,并和现场不采用抗冻拔措施的船台比较,发现采用加套筒方案,试验船台在寒期内产生的位移平均值为2-3mm,较自然冻拔船台位移小90%。考虑精密水准测量精度±2mm,船台基本上没有冻拔位移,证明抗冻拔措施成功、有效。Combining with a manual berth project in frozen area park, frictional resistance and uplift displacement of piles induced by tangential frozen heaving force are decided by in-site test. Rigid and flexible sleeves are designed on piles to resist frozen and uplift. Tested berths are built according to frozen and uplift resistant schemes. Test result shows that average displacement of berths with sleeves is 2 - 3mm, which is only 10 percent of that without frozen and uplift resistant scheme. Considering measuring precision of exactitude level （ ± 2mm）, almost no frozen and uplift displacement happens in berths with sleeves. It proves that the frozen and uplift resistant measures are effectively.

关 键 词：季节冻土区 短桩 基础 抗冻拔 切向冻胀力 补救措施 

分 类 号：TU445[建筑科学—岩土工程]