摘要
采用压缩仪和收缩仪,对重塑膨胀土进行了无荷条件下的反复膨胀和收缩试验。试验结果表明:随着干湿循环次数的增加,试样的最终膨胀率和最终收缩率逐渐减小;膨胀变形明显减小,而收缩变形减小的幅度不大;试样的最终高度均呈现减小趋势;收缩系数不断减小,最终趋于稳定;采用绝对膨胀率、相对膨胀率、绝对收缩率和相对收缩率等参数可以合理描述干湿循环作用下膨胀土的胀缩变形特征。
The repeated swell-shrinking tests on remolded expansive soils without loads are performed by means of compression apparatus and shrinkage apparatus. The resuhs show that both the final expansion ratio and shrinkage ratio of specimens gradually decrease as wetting-drying cycles increase. The swelling deformation obviously decreases, while the shrinking one slightly decreases. The final height of the specimens has a tendency of decrease. The shrinkage coefficient continuously decreases and finally tends to be stable. The parameters such as absolute expansion ratio, relative expansion ratio, absolute shrinkage ratio and relative shrinkage ratio can rationally depict the swell-shrinking performance of expansive soil under wetting-drying cycles.
出处
《水利水电科技进展》
CSCD
北大核心
2013年第1期62-65,73,共5页
Advances in Science and Technology of Water Resources
基金
南昌航空大学博士启动基金(EA201211115)
国家自然科学基金(51008117)
关键词
膨胀土
胀缩变形
干湿循环
膨胀率
收缩率
expansive soil
swell-shrinking deformation
wetting-drying cycle
expansion ratio
shrinkage ratio
