THE EFFECT OF PRINCIPAL STRESS RATIO ON CREEP BEHAVIOUR OF OVER-CONSOLIDATED CLAY UNDER PLANE STRAIN CONDITIONS
LI Guowei1,2,HUANG Kai1,3,RUAN Yusheng1,3,LI Xiang1,3,YIN Jianhua4
(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210098,China;2. Highway and Railway Research Institute,Hohai University,Nanjing,Jiangsu 210098,China;
3. Geotechnical Research Institute,Hohai University,Nanjing,Jiangsu 210098,China;4. Department of Civil and Structure Engineering,The Hong Kong Polytechnic University,Hong Kong,China)
Abstract:The effect of principal stress ratio on creep behaviour of over-consolidated soil was studied through tests on undisturbed soft clay samples under plane strain conditions. The over-consolidation shear stress ratio (OCRq),defined with the generalized shear stress,was found to be a function of the principal stress ratio and the pre-consolidation pressure. OCRq can provide a better and more direct description of the creep behaviour of over-consolidated soft clay under plane strain conditions compared with the over-consolidation spherical stress ratio(OCRp). There is a one-to-one relationship between the creep coefficient and the OCRq:as the OCRq increases,the corresponding creep coefficient decreases. For the same OCRq,over-consolidated soils with smaller principal stress ratios will have larger creep coefficients. For different principal stress ratios,the over-consolidated soft clays will have smaller generalized shear stress than normally consolidated ones. Under certain conditions,the generalized shear stress increases with decreasing principal stress ratio and the corresponding over-consolidated soil will have greater long-term creep deformation.
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LI Guowei1,2,HUANG Kai1,3,RUAN Yusheng1,3,LI Xiang1,3,YIN Jianhua4. THE EFFECT OF PRINCIPAL STRESS RATIO ON CREEP BEHAVIOUR OF OVER-CONSOLIDATED CLAY UNDER PLANE STRAIN CONDITIONS. , 2015, 34(12): 2550-2558.
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