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中文摘要：
动模量一直是土动力学研究中最为重要的参数之一，土动力学中使用最为广泛的等效线性本构模型即对动模量随动应变衰减规律的定量描述。在之前关于饱和软黏土动模量的研究中，已经考虑到诸如固结比、塑性指数、土体组构、饱和度、先期应力历史、动荷载频率、时间效应等因素的影响。但是由于各种各样的原因，鲜有文献涉及应力路径尤其是循环偏应力和循环围压耦合应力路径对饱和软黏土动模量衰减规律的影响。考虑到循环围压在土体动应力场中存在的普遍性，通过一系列循环偏应力和循环围压耦合应力路径下的逐级加载试验，研究了循环围压对饱和软黏土动模量衰减规律的影响。试验结果表明：循环围压不但会改变了某一应变值下饱和软黏土动模量的大小，而且其改变趋势及大小与相位差有关；通过拟合分析证实Hardin-Drnevich模型并不适合循环偏应力和循环围压耦合应力路径下饱和软黏土动模量衰减规律的定量描述，而基于Stokoe公式却得到了较为理想的拟合结果。
英文摘要：
The dynamic modulus is always the most important parameter in soil dynamics, and the most popular equivalent linear constitutive model in geotechnical engineering is just to quantitatively describe the dynamic modulus degradation. In the previous researches on the dynamic modulus, the factors such as OCR, PI, soil fabric, saturation degree, stress history, frequency and aging have been considered. However, because of some reasons, the stress path, especially the coupling stress path of cyclic deviatoric stress and cyclic confining pressure, has rarely been studied. Considering the fact that the cyclic confining pressure is ubiquitous in soil stress fields, the influences of the cyclic confining pressure on the dynamic modulus of soft saturated clays are studied based on the step-by-step tests. The test results show that the confining pressure changes the magnitudes of the dynamic modulus under certain dynamic strains, and the changing tendency and magnitudes are related to the phase differences. The Hardin-Dmevich model is also proved not to fit the behavior of the dynamic modulus degradation, while the Stokoe equation is more appropriate.
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