摘要
通过补水条件下的冻融循环试验,研究冻融循环作用对黄土样的水分分布、变形和干密度的影响.试验结果表明:反复的冻融循环作用使得土样含水量增加,从底板到顶板土样含水量逐渐递增,冻融界面附近含水量变化梯度较大;黄土样在冻融循环初期冻胀变形比较剧烈,之后总体变形趋于稳定,冻融循环后期土样出现较小的沉降变形;冻融循环使得黄土样的干密度逐渐减小,且冻融循环剧烈的上部干密度较下部更小.
By means of freezing-thawing cyclic test with water supplement,the impact of freezing and thawing actions on deformation,water redistribution and dry dense of loess samples was studied.The experimental result showed that repeated freezing and thawing actions would make the water content in samples increased gradually from the bottom to the top.It changed sharply near the interface between frozen and unfrozen areas.At the starting of freeze-thaw cycle,the frost heave of loess samples was stronger.Then the overall deformation became stable,which meant that the deformation induced by frost heave was equal to that inducted by thaw settlement.At the end of freeze-thaw cycle,there was a small settlement in samples,which resulted probably from soil particle rearrangement caused by strong freezing and thawing action.In addition,freezing and thawing actions decreased gradually the dry density of loess samples.The dry density in upper part was larger than that in bottom part.
出处
《兰州理工大学学报》
CAS
北大核心
2010年第2期114-117,共4页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(40801022
40821001)
中国科学院西部行动计划项目(KZCX2-XB2-10
KZCX2-YW-Q03-04)
关键词
黄土
冻融循环
冻胀
融沉
变形
含水量
干密度
loess
freeze-thaw cycle
frost heave
thaw settlement
deformation
water content
dry density
