超固结非饱和土的试验研究  

Experimental study of behaviors of overconsolidated unsaturated clays

作　　者：姚仰平[1] 牛雷[1] 韩黎明 胡贺祥[1] 王广德 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191 [2]中国民航机场建设集团公司机场工程科研基地,北京100101

出　　处：《岩土力学》2011年第6期1601-1606,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50879001;No.11072016;No.10872016)

摘　　要：Farulla等[1]通过固结仪对不同轴应力下的超固结非饱和土进行了湿化变形研究,试验结果表明超固结非饱和土的湿化变形随轴应力的不同而不同,其规律与Alonso等[2]的假设并不完全相符。为了进一步验证这个试验现象,利用双压力室非饱和土三轴仪,在同一个前期固结压力下对不同程度的超固结非饱和土进行了湿化试验,研究其湿化变形特性;对某一吸力下的超固结非饱和土进行三轴排水剪切试验,研究其体变和强度特性。试验结果证明了Farulla等试验的正确性,最后用文中所提的模型进行了预测,其结果与试验现象一致。A series of oedometer tests under different values of constant vertical net stress have been undertaken by by Alonso et al.To verify the test results presented by Farulla et al.,two kinds of tests for overconsolidated unsaturated clays w Farulla et al.to investigate the behavior of overconsolidated unsaturated clays during wetting.It is shown in the experimental data that the volume change induced by wetting varies with the vertical net stress,which is not exactly the same as the assumption proposed ere carried out using the double-cell triaxial system.One is a series of tests to investigate the effect of overconsolidation degree on wetting behavior under the same preconsolidation pressure.The other is the triaxial drained tests under a certain suction to study the behavior of deformation and strength of overconsolidated unsaturated clays.The results of the experiments confirm the verification of the interpretation by Farulla et al.Moreover,the behavior of overconsolidated unsaturated clays under wetting paths observed in the experiments is modeled by the UH model.

关 键 词：非饱和土 吸力 超固结 软化 湿化 三轴试验 

分 类 号：TU443[建筑科学—岩土工程]