Rheological catastrophic model for soft clays  

作　　者：马伯宁 谢新宇 刘开富 

机构地区：[1]Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education(Zhejiang University) [2]School of Civil Engineering and Architecture,Ningbo Institute of Technology,Zhejiang University [3]Department of Civil Engineering and Architecture,Zhejiang Science and Technology University

出　　处：《Journal of Central South University》2012年第8期2316-2322,共7页中南大学学报（英文版）

基　　金：Project(51079126) supported by the National Natural Science Foundation of China;Project(Y1090971) supported by the Natural Science Foundation of Zhejiang Province, China

摘　　要：A brief review of the former studies on the mechanisms of soil rheology and microstructure is presented. Then a microstructure model and a set of rheological constitutive relations for sott clays, which describe how the rheological consolidation settlement develops, are established in the framework of the catastrophe theory. The validity of this model is verified by a series of rheological consolidation experiments with different loading rates. The experimental data show that creep deformation can be clearly observed in these tests, and the consolidation settlement is loading rate dependent. The characteristics of the deformation can be explained and reproduced successfully using the model. It can be concluded that only the biggest set of voids would collapse for one load increment. Parameters in the model, k and η, are gained by curve fitting. With only two free parameters, good fits of the data are achieved.A brief review of the former studies on the mechanisms of soil rheology and microstructure is presented. Then a microstructure model and a set of rheological constitutive relations for soft clays, which describe how the rheological consolidation settlement develops, are established in the framework of the catastrophe theory. The validity of this model is verified by a series of rheological consolidation experiments with different loading rates. The experimental data show that creep deformation can be clearly observed in these tests, and the consolidation settlement is loading rate dependent. The characteristics of the deformation can be explained and reproduced successfully using the model. It can be concluded that only the biggest set of voids would collapse for one load increment. Parameters in the model, k and η, are gained by curve fitting. With only two free parameters, good fits of the data are achieved.

关 键 词：CLAY rheological consolidation MICROSTRUCTURE catastrophic model oedometer tests 

分 类 号：P642.1[天文地球—工程地质学]