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ABSTRACT
With the objective to study the effect of viscous property on the mechanical behaviour of structured clays, a series of compression and consolidation-undrained shear tests in different loading rates, using oedometer and triaxial instruments respectively, were carried out on undisturbed samples of clays. The compression curves in different load incremental ratios shows that the load incremental ratio has an effect on structural yield stresses, while it has little influence on compression indices of clays. The stress–strain–pore pressure curves show that shear strength increases, while pore water pressure decreases with increasing shear strain rate, and the critical state stress ratio is constant in reasonable shear strain rate range. When the shear strain rate exceeds the boundary of shear strain rate, the pore water pressure drops sharply and the failure mode changes from plastic failure to brittle failure. The test results illustrate that loading rate has an effect on the structural yield stress and shear strength, while it has little influence on compression index and critical state stress ratio of structured clays.
Disclosure statement
No potential conflict of interest was reported by the authors.
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Notes on contributors
Jin Pan
Jin Pan, Master, Lecturer, Research interest: the basic mechanical behavior of clay. Email: [email protected].
Chen Bo
Chen Bo, Ph.D, Associate Professor, Research interest: the mechanical behavior of unsaturated clay and its constitutive model. Email: [email protected]
Hu Yun-Shi
Hu Yun-shi, Master, Professor, Research interest: the mechanical behavior of unsaturated clay and its constitutive model. Email: [email protected]