吸力控制下非饱和土的动力特性

Dynamic Properties of Unsaturated Soils Controlled by Suction

以非饱和粉砂为研究材料,利用非饱和土动三轴仪,在3种不同净应力和5种不同基质吸力的工况下,对试样进行循环荷载下的动三轴试验,得出了非饱和粉砂的动弹性模量与阻尼比,并讨论了它们随着动应变、净应力、基质吸力的变化规律:1)在净应力和基质吸力一定的情况下,动弹性模量随着动应变的增大而减小,阻尼比随着动应变的增大而增大;2)在净应力和动应变一定的情况下,动弹性模量随着基质吸力的增大而增大,阻尼比随着基质吸力的增大而减小;3)在基质吸力和动应变一定的情况下,动弹性模量随着净应力的增大而增大,阻尼比随着净应力的增大而减小.

In this paper, a series of dynamic triaxial tests on unsaturated silty sand were conducted using other conditions remain unchanged： 1） the dynamic modulus of elasticity decreases with the increase in dynamic strain; 2） the dynamic modulus of elasticity increases as the suction; 3） creases with the increase in net stress. But the laws of damping ratio are j elasticity the dynamic modulus of elasticity in- ust the opposite to dynamic modulus of