2007, Volume 9, Issue 11
Strategic Study of CAE >> 2007, Volume 9, Issue 11
The Principle of Interaction Between Plastic Volumetric and Shear Strains for Unsaturated Soils
1. Department of Architectural Engineering, Xinyang Normal University, Xinyang Henan 464000, China;
2. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract
In this paper, the principle of interaction between plastic volumetric and shear strains for rock and soil has been extended to the field of unsaturated soils. Two new interactions of suction-plastic volumetric strain and pore air pressure-plastic volumetric strain appear in the unsaturated state of a soil besides the interaction between plastic volumetric and shear strains. The suction possesses a dual property. Thereby the effect of the suction on plastic volumetric strain includes two opposite aspects. By means of this property of suction, the physical significance of effective stress parameter, effects of suction on volume change and preconsolidation pressure, and the mechanism of collapse upon wetting all can be explained. In addition, it is theoretically proved by application of this principle of interaction that the critical state line for unsaturated soils exists, and is unique and independent of the stress history.
Keywords
the principle of interaction between plastic volumetric and shear strains ; unsaturated soil ; matric suction ; the principle of effective stress
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References
[ 1 ] Bishop A W. The principle of effective stress [ J ] . Tecknish Ukeblad, 1959 , 106 : 859 ~863 link1
[ 2 ] Khalili N, Knabbaz M H. A unique relationship for the determination of the shear strength of unsaturated soils [ J ] . Geotechnique, 1998 , 48 ( 5 ) : 681 ~687 link1
[ 3 ] Khalili N, Geiser F, Blight G E.Effective stress in unsaturated soils: Review with new evidence [ J ] .Int J of Geomechanics©ASCE June, 2004 , 115 ~126 link1
[ 4 ] Fredlund D G,Morgenstern N R.Stress state variables for unsatu- rated soils[ J] .ABB Rev, 1977 , 103 ( 5 ) : 447 ~466 link1
[ 5 ] Loret B, Khalili N.Three -phase model for unsaturated soils[ J] . Int J Numer Anal Meth Gcomech, 2000 , 24 : 893 ~927 link1
[ 6 ] 王靖涛.论岩土塑性体应变与剪应变的相互作用原理[J].中国工程科学,2006,8(9):24~29 link1
[ 7 ] Wang J T.The principle of interaction between plastic volumetric and shear strains and the constitutive model for geotechnical materials [ J ] . Chinese Academy of Engineering, Engineering Sciences, 5
[ 8 ] Loret B,Khalili N.An effective stress elastic -plastic model for unsaturated porous media[ J] .Mechanics of Materials, 2002 , 34 : 97 ~116 link1
[ 9 ] Fleureau J M.Kheir -saouds, soemitro R and Taibi S.Behaviour of clayey soils on drying -wetting path [ J ] .Can, Geotech J, 1993 , 30 : 287 ~296 link1
[10] Wheeler S J, Sivakumar V.An elasto -plastic critical state framework for unsaturated soils [ J ] . Geotechnique, 1995 , 45 ( 1 ) : 35 ~53 link1
[11] Hvorslev M J. Uber die fesigkeitseigens -chaften gestorter bindiger boden[ J] .Ingvidensk, Skr A, 1937
[12] Roscoe K H, Schofield M A, Wroth C P.On the yielding of soil [ J] .Geotechnique, 1958 ,( 8 ) : 22 ~53 link1
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