Cyclic degradation and non-coaxiality of soft clay subjected to pure rotation of principal stress directions |
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| Authors: | Jian-Gu Qian Zi-Bo Du Zhen-Yu Yin |
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| Institution: | 1.Department of Geotechnical Engineering,Tongji University,Shanghai,China;2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai,China;3.Research Institute of Civil Engineering and Mechanics (GeM), UMR CNRS 6183,Ecole Centrale de Nantes,Nantes,France |
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| Abstract: | Foundation soils are often under non-proportional cyclic loadings. The deformation behaviour and the mechanism of non-coaxiality under continuous pure principal stress rotation for clays are not clearly investigated up to now. In order to study the effect of pure principal stress rotation, a series of cyclic undrained tests on Shanghai soft clay subjected to cyclic rotation of principal stress directions keeping the deviatoric stress constant under the pure rotation condition were conducted using hollow cylinder apparatus. Based on this, the evolutions of excess pore pressure and strains during cyclic loading were investigated, together with the effects of the intermediate principal stress parameter and the deviatoric stress level on stress–strain stiffness and non-coaxiality. The result can provide an experimental basis for constitutive modelling of clays describing the behaviour under non-proportional loadings. |
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