主应力比对超固结软黏土平面蠕变的影响研究

doi:10.13722/j.cnki.jrme.2014.1579

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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.

Key words： soil mechanics soft clay principal stress ratio plane strain over-consolidation creep

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1579 OR http://www.rockmech.org/EN/Y2015/V34/I12/2550

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