INFLUENCE OF CYCLIC CONFINING PRESSURE ON CUMULATIVE DEFORMATION BEHAVIOR OF OVERCONSOLIDATED CLAY
SUN Lei1，2，WANG Jun3，SUN Honglei1，2，GU Chuan3，CAI Yuanqiang1，2，3
(1. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；3. College of Civil Engineering and Architecture，Wenzhou University，Wenzhou，Zhejiang 325035，China)
Abstract：A series of undrained cyclic tests under consfant/variable confining pressures were carried out on typical Wenzhou soft clay by GDS cyclic triaxial apparatus. The coupling effect of cyclic deviatoric stress and cyclic confining pressure on the undrained permanent deformation of overconsolidated saturated soft clay was studied. Under the undrained condition，the cyclic confining pressure was found to limit the development of the permanent axial strain of overconsolidated saturated soft clay to some extent. The permanent axial strain reduced 20.18% if the ratio of p/q was raised value of 1. On the basis of the experimental results，an empirical formula incorporating the effect of overconsolidation ratio and cyclic confining pressure was proposed to estimate the permanent axial strain in the undrained cyclic tests.
2015, Vol. 34 
