中南大学学报（自然科学版）2013，Vol.44Issue(4)：1657-1665,9.
循环荷载作用下花岗岩残积土累积变形与湿化特性试验研究
Indoor experimental study for accumulative and wetting deformation of granite residual soil under cyclic loading
摘要
Abstract
Based on the fact that the granite residual soil has special mineral composition, complicate compacting mechanism and impressionable mechanism with water obviously, in order to guide practical compaction control, the mineral composition was analyzed by X-ray diffraction test, the physical and mechanical properties were analyzed by soil test, the accumulative and wetting deformation under cyclic loads were researched by compression test and plate loading test. The results show that the samples which have 35% (mass fraction) muscovite-illite, and 27% kaolinite, belong to fine grained soil gravel with bad gradation. The compression curves are convex type, while the rebound curves are concave type; the (i+1)th compression-rebound curves are below the ith with similar linetype. With the increase of the number of compaction operations under the same load, the increment of settlement decreases and accumulative settlement is enhanced. Overload compression curve can be regressed on the extension line of first compression curve, which has memory effect. When the load is larger, the total and permanent deformation becomes bigger each time. Wetting deformation occurs after humidification when circulate loading and unloading are finished. The compression curves of humidified soil are concave type, while the larger the overload is, the less the deformation under the same load.It's better to increase the tonnage of the road roller than the increase of the number of compaction operations in the practical process of construction.关键词
花岗岩残积土/压缩实验/平板载荷试验/累积变形/湿化Key words
granite residual soil/ compression test/ plate loading test/ accumulative deformation/ humidification分类
交通工程引用本文复制引用
周德泉,谭焕杰,徐一鸣,周毅,孙义..循环荷载作用下花岗岩残积土累积变形与湿化特性试验研究[J].中南大学学报（自然科学版）,2013,44(4):1657-1665,9.基金项目
国家自然科学基金资助项目(50978036) （50978036）
广东省交通运输厅科技项目(2011-02-009) （2011-02-009）
湖南省教育厅重点科研资助项目(09A005) （09A005）
