非饱和粉土的动弹性模量和阻尼比研究  

Study on dynamic modulus and damping ratio of unsaturated silt

作　　者：孙德安[1] 吴波[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《水利学报》2012年第9期1108-1113,1120,共7页Journal of Hydraulic Engineering

基　　金：上海市教委科研创新项目(12ZZ093)

摘　　要：使用吸力可控或可测的非饱和土振动三轴试验仪,对非饱和及饱和粉土进行动力变形试验,在不同净围压应力、不同初始含水率的条件下,得到了非饱和及饱和粉土试样的动应力应变骨架曲线、动弹性模量和阻尼比,并量测试样吸力。试验结果表明:(1)非饱和粉土的骨架曲线比饱和粉土的高;(2)在相同净围压条件下,不同含水率的非饱和粉土动弹性模量大小相近,而饱和土试样的动弹性模量略小;(3)在相同净围压条件下,不同含水率的非饱和粉土阻尼比也相近,而饱和土粉土的阻尼比略大。Dynamic deformation characteristics of both unsaturated and saturated silt have been studied by using a dynamic triaxial testing apparatus for unsaturated soils, which can control or measure the specimen suction. Some test results were obtained, including the skeleton curve, dynamic modulus, damping ratio of unsaturated and saturated specimens at different net confining pressures and water contents, and the specimen suctions were also measured. Test results show that the skeleton curve of unsaturated silt is higher than that of saturated silt. Under the condition of the same net confining pressure, dynamic modulus and damping ratio of unsaturated silt are almost close for different water contents, while dynamic modulus of saturated silt is a little smaller than that at unsaturated state and damping ratio of saturated silt is a little bigger than that at unsaturated state. The above test results can be explained by the theory of unsaturated soil mechanics.

关 键 词：非饱和土 粉土 动模量 阻尼比 吸力 

分 类 号：TU443[建筑科学—岩土工程]