加筋土挡墙冻融试验研究  

Experimental study on reinforced retaining walls suffering freeze-thaw cycling

作　　者：汪恩良[1,2] 钟华 孙景路 高占坤 徐学燕[2] 

机构地区：[1]黑龙江省水利科学研究院,黑龙江哈尔滨150080 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《岩土工程学报》2010年第2期265-270,共6页Chinese Journal of Geotechnical Engineering

基　　金：黑龙江省青年基金项目(QC04C04)

摘　　要：通过模拟野外实测降温过程,进行加筋土挡墙在开敞条件下的冻融试验研究,得到结论:①冻结过程中产生了水平冻胀力,加筋格栅克服水平冻胀力的作用产生拉应变,起到削减水平冻胀力的作用;②加筋挡墙顶面在冻结过程中产生冻胀变形,当表面温度降至-5℃以下时冻胀停止,从负温升至-5℃以上时,冻胀重新开始,验证了存在冻胀停止温度的观点;③升温过程中挡墙顶面产生较大融沉变形,季节冻土区的加筋土挡墙应避免春融期产生不允许的融沉变形。Through modeling field temperature process,the experimental study on reinforced retaining walls suffering freeze-thaw cycling is performed.Conclusions are drawn as follows：（1） Horizontal frost-heave forces always occur during freezing,and tensile strain appears in the geogrid used in the reinforced retaining walls,which reduces the horizontal frost-heave forces.（2） Frozen deformation occurs at the top of the retaining wall during freezing.When the temperature drops down to-5℃,the frost-heave stops.When the temperature rises and surpasses-5℃,the frost-heave restarts.So it is validated that there exists the frost-heave stop temperature.（3） Melt settlement deformation occurs at the top of the retaining walls during temperature rising.Accordingly,the reinforced retaining walls in seasonally frozen regions should avoid inadmissible melt settlement deformation during spring thawing.

关 键 词：季节冻土区 加筋土挡墙 冻融试验 塑料土工格栅 

分 类 号：TU476[建筑科学—结构工程]