摘要
利用GDS 10 Hz/20 kN双向振动三轴系统,进行了一系列饱和砂土不排水动三轴试验,研究了不同固结围压对饱和砂土动力特性的影响。试验结果表明:动弹性模量随动弹性应变幅的增大而减小,随围压的增大而增大;阻尼比随动弹性应变幅的增大而增大,围压对阻尼比的影响不显著,动弹性应变比较低的情况下,阻尼比有随围压增大而减小的趋势;不同围压下砂土的动强度曲线可近似地归一,其振动孔压发展模式与Seed提出的砂土的振动孔压发展模式相同,可以用反正弦三角函数拟合。
With the GDS 10Hz/20kN dynamic triaxial system, the undrained dynamic triaxial tests on the saturated sands are performed. The confining pressure effects on dynamic characteristics of the saturated sand are discussed. It is found that the dynamic elastic modulus decreases with the dynamic elastic strain increasing, but increases with the accretion of confining pressure. The damping ratio is not sensitive to the change of confining pressure, but it has the tendency to decrease as the accretion of confining pressure, especially in minor dynamic elastic strain. The dynamic strength curve under different confining pressures can be described by the same expression approximately under isotropic consolidation, the pore water pressure curve in mealy sand is the same as that proposed by Seed and can be fitted by arcsine function under different confining pressures.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第2期295-299,共5页
Chinese Journal of Underground Space and Engineering
关键词
围压
动弹性模量
阻尼比
动强度
动孔压
confining pressure
dynamic elastic modulus
damping ratio
dynamic strength
dynamic pore water pressure
