干湿循环下膨胀土胀缩性能试验  

Experimental study on swell-shrinking performance of expansive soil under wetting-drying cycles

作　　者：吴珺华[1] 袁俊平[2,3] 杨松[4] 卢廷浩[2,3] 

机构地区：[1]南昌航空大学土木建筑学院,江西南昌330063 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [3]河海大学岩土工程科学研究所,江苏南京210098 [4]云南农业大学水利水电与建筑学院,云南昆明650201

出　　处：《水利水电科技进展》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)

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.

关 键 词：膨胀土 胀缩变形 干湿循环 膨胀率 收缩率 

分 类 号：TU443[建筑科学—岩土工程]