UH MODEL FOR SOILS AND ITS EXTENTION
Based on the relationship between the current yield surface and the reference yield surface,the UH model,called the three-dimensional unified hardening model for overconsolidated clays,has been proposed.The key feature of the UH model is adoption of a unified hardening parameter that is independent of stress paths.To evaluate the potential peak stress ratio in overconsolidated clays,a parabolic Hvorslev envelope rather than a straight line is adopted to modify the UH model.This modification leads to more realistic predictions on highly overconsolidated clays than with a straight line in the original UH model,and is consistent with critical state soil mechanics wherein the higher peak stress ratio shown in overconsolidated clays is a result of dilatancy rather than cohesion.The UH model has been developed and extended,and now it can consider the influence ofanisotropy,suction,temperature,etc.The Generalized Non-linear Strength Theory (GNST) has been proposed based on the test date of frictional material and previous research achievements in this field.It describes non-linear strength properties on the π-plane and the meridian plane using a unified formula.Through the transformed stress space based on the GNST,the combination of the GNST and the UH model using p and q as stress parameters can be realized simply and rationally in three-dimensional stress state.
UH model modified UH model temperature generalized non-linear strength theory transformed stress
YANGPING YAO
Department of Civil Engineering,Beihang University,HaidianDistrict,Beijing,100191,China
国际会议
5th China-Japan Geotechnical Symposium(第五届中日岩土工程学术会议)
成都
英文
3-16
2013-05-18（万方平台首次上网日期，不代表论文的发表时间）