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| 1 | Comparison Study of Constitutive Models for Overconsolidated Clays显示文摘Widely distributed in natural deposits,the overconsolidated(OC)clays have attracted extensive experimental investigations on their mechanical behaviors,especially in the 1960s and 1970s.Based on these results,numerous constitutive models have also been established.These models generally fall into two categories:one based on the classical plasticity theory and the other the bounding surface(BS)plasticity theory,with the latter being more popular and successful.The BS concept and the subloading surface(SS)concept are the two major BS plasticity theories.The features of these two concepts and the representative models based on them are introduced,respectively.The unified hardening(UH)model for OC clays is also based on the BS plasticity theory but distinguishes itself from other models by the integration of the reference yield surface,unified hardening parameter,potential failure stress ratio,arid transformed stress tensor.Modification is made to the Hvorslev envelop employed in the UH model to improve its capability of describing the behaviors of clays with extremely high overconsolidation ratio in this paper.The comparison among the BS model,SS model,and UH model is performed.Evidence shows that all these three models can characterize the fundamental behaviors of OC clays,such as the stress dilatancy,strain softening and attainment of the critical state.The UH model with the revised Hvorslev envelop has the fewest parameters which are identical to those of the modified Cam-Clay model. | Z.Wan Y.P.Yao Z.W.Gao | 2020 | Acta Mechanica Solida Sinica2020，33，1： | 3 |
| 2 | Comparison of filter cleaning performance between VDI and JIS testing rigs for cleanable fabric filter显示文摘 | N.Mao Y.P.Yao M.Hata M.Wada C.Kanaoka | | 0，，： | 1 |
| 3 | Comparison of filtration performances of cleanable fabric filters measured by VDI and JIS testing rigs显示文摘 | N.Mao Y.P.Yao C.Kanaoka | | 0，，01： | 1 |
| 4 | Modeling the filtration process with a flat-type fabric filter显示文摘 | N.Mao Y.Otani Y.P.Yao C.Kanaoka | | 0，，03： | 1 |
| 5 | A critical state model for sands dependent on stress and density显示文摘 | Y.P.Yao D.A.Sun T.Luo | 2004 | Int J Numer Anal Meth Geomech2004，，4： | 1 |
| 6 | A critical state model for sands dependent on stress and density显示文摘 | Y.P.Yao D.A.Sun T.Luo | 2004 | Geomech2004，，4： | 1 |
| 7 | Loading-unloading judgement for advanced plastic UH model显示文摘The unified hardening(UH)model proposed by Yao et al.(Geotechnique 2009)is the constitutive model which can consider the influence of the complex stress path and stress history on the deformation and strength of clays reasonably.Firstly,the loading-unloading criterion of material model is defined as the change law of the intersection of current yield surface and the p axis,which makes the loading-unloading in the process of hardening and softening can be unified considered in UH model.Then,the Newton-Raphson method is adopted to attain the nonlinear problems solution in the finite element method of UH model,and the semi-implicit return mapping method is adopted to update stress.The application of the UH model in the finite element is realized.And then,the analyses of triaxial test are performed using the unit prediction and finite element method.The results of the unit prediction method are compared with the experimental results to illustrate the rationality of the UH model.Comparing the results with the unit prediction method and the finite element method,the correctness of the finite element program of the UH model is iUusttated.Further,Ae three-dimensional firdte element andysis of embankment on soft soil is performed by the program.The comparison between the results calculated by the UH model and the modified Cam-clay(MCC)model and the experimental data shows that the UH model is rational in analyzing the actual embankment engineering on soft soil. | X.Feng Y.P.Yao R.N.Li Z.Wan X.Dai | 2020 | Acta Mechanica Sinica2020，36，4： | 1 |
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