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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。
The unsaturated soil and saturated silt were subjected to dynamic deformation test by using the controllable or measurable unsaturated soil vibrating triaxial tester. Under different net compressive stress and different initial moisture content, unsaturated and saturated The dynamic stress-strain skeleton curve, dynamic elastic modulus and damping ratio of silt samples are measured, and the sample suction is measured. The experimental results show that: (1) The skeleton curve of unsaturated silt is higher than that of saturated silt; (2) Under the same net confining pressure, the dynamic elastic modulus of unsaturated silt with different water contents is similar, while that of saturated soil The elastic modulus of the specimen is slightly smaller; (3) Under the same net confining pressure, the damping ratio of unsaturated silt with different moisture content is also similar, while the damping ratio of saturated silt is slightly larger.