岩土工程学报Issue(7)：1218-1226,9.DOI:10.11779/CJGE201407005
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研究
Dynamic modulus degradation for soft saturated clay under coupling stress paths of cyclic deviatoric stress and cyclic confining pressure
摘要
Abstract
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-Drnevich model is also proved not to fit the behavior of the dynamic modulus degradation, while the Stokoe equation is more appropriate.关键词
饱和软黏土/动模量/循环围压/应力路径Key words
soft saturated clay/dynamic modulus/cyclic confining pressure/stress path分类
建筑与水利引用本文复制引用
李校兵,谷川,蔡袁强..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研究[J].岩土工程学报,2014,(7):1218-1226,9.基金项目
国家杰出青年科学基金项目（51025827）；国家自然科学基金项目（51109164，51308420）；浙江省自然科学基金项目（Y1110567）；温州市科技计划项目 （）
