(1. College of Architecture and Civil Engineering，Wenzhou University，Wenzhou，Zhejiang 325035，China；2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education，Zhejiang University，Hangzhou，Zhejiang 310027，China)
Abstract：The cyclic spherical stress is very common in the dynamic stress field of soils；however，in previous researches，it was usually neglected. Based on the dynamic triaxial tests with cyclic confining pressure，the influences of cyclic spherical stress on the strain behavior of saturated clays are studied through coupling cyclic confining pressure and cyclic deviatoric stress. Moreover，the action mechanisms are also discussed. Test results show that the existence of cyclic spherical stress not only changes the development speeds of cyclic strain，but also changes the ratios of maximum compression strain to maximum extension strain. The influences are not only related to the phase differences between cyclic spherical stress and cyclic deviatoric stress，but also related to the amplitude of cyclic deviatoric stress. When the phase angle is 180°，the compressive strain develops more quickly；and when the phase angle is 0°，the tension strain develops more quickly. Based on the test results，the action mechanisms of cyclic spherical stress on the changes of dynamic strain behavior are explained from the perspective of the total stress and the effective stress，respectively.
刘恩龙，沈珠江. 不同应力路径下结构性土的力学特性[J]. 岩石力学与工程学报，2006，25(10)：2 058-2 064.(LIU Enlong，SHEN Zhujiang. Mechanical behavior of structured soils under different stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(10)：2 058-2 064.(in Chinese))
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2013, Vol. 32 
