为评价动力作用下饱和砂土的变形,通过试验,研究了球应力循环加载下饱和砂土的变形规律,提出描述各变形分量的本构模型。通过系列的饱和砂土球应力循环加载的动力三轴试验,分析体积应变和偏应变随循环次数的变化规律;从细观组构角度分析粒状土各变形分量的产生原因;给出弹性和塑性模量表达形式,描述各变形分量的发展规律。结果表明:不可逆性压缩体应变随循环次数不断累积,累积速率随累积量增加而降低;可逆性压缩体应变呈现可恢复的循环变化,可采用弹性方法描述;可逆性和不可逆性偏应变量相对较小,可以忽略。 In order to evaluate the deformation of saturated sands under dynamic loading, the deformation laws of saturated sands under cyclic loading of the ball were studied, and the constitutive model describing the deformation components was proposed. A series of dynamic triaxial tests were conducted to investigate the variation of volumetric strain and partial strain with the number of cycles. The causes of the deformation components of granular soils were analyzed from the perspective of mesostructural structure. The elastic and plastic properties Modular expression, describing the development of the deformation of the law. The results show that the irreversible compressive strain accumulates continuously with the number of cycles, and the cumulative velocity decreases with the increase of the cumulant. The compressive strain shows a recoverable cyclic change, which can be described by the elastic method. The reversible and irreversible deviators are relative Smaller, can be ignored.