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《Journal of Zhejiang University(Engineering Science)》 2007-01
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Study on dynamic stress-strain relationship of soft clay considering degradation of stiffness under cyclic loading

WANG Jun,CHEN Zhang-lin,CAI Yuan-qiang,LIU Fei-yu(1.Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310027,China;2.Hangzhou Qiangjiang New City Construction Headquarters,Hangzhou 310016,China)  
Earthquakes,storm waves and traffic often induce severe undrained cyclic loading.Degradation of stiffness and strength will occur in soft clay under cyclic loading because of the generation of pore pressure.Unfortunately,previous work rarely incorporated the effect of initial deviator stress on cyclic degradation behavior and dynamic stress-strain relationship of soft clay.The degradation of stiffness characteristics and dynamic stress-stain relationship of normally consolidated soft clay subjected to undrained cyclic triaxial loading were investigated at different numbers of cycles,cyclic stress levels and initial deviator stresses.It was observed that the stiffness reduces due to the increasing number of cycles,and that higher cyclic stress level and initial deviator stress accelerate the degradation of stiffness and the development of accumulated strain.A linear relationship was obtained if secant shear modulus was plotted against numbers of cycles on a semi-log scale.This relationship were synthesized in the form of an empirical equation,which was further used to describe the dynamic stress-strain relationship of saturated soft clay according to modified Masing's rule.
【Fund】: 国家自然科学基金资助项目(50478081)
【CateGory Index】: TU431
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