2005年6月19～24日，第11届国际岩土力学计算方法与进展协会国际会议（11th Conference of International Association for Computer Methods and Advances in Geomeclaanics—IACMAG）在意大利历史名城都灵（Turin）隆重召开，香港理...2005年6月19～24日，第11届国际岩土力学计算方法与进展协会国际会议（11th Conference of International Association for Computer Methods and Advances in Geomeclaanics—IACMAG）在意大利历史名城都灵（Turin）隆重召开，香港理工大学土木与结构工程系殷建华教授荣获“国际岩土力学计算方法与进展协会”（IACMAG）2005年度地区杰出贡献奖。展开更多
The influences of time on clays are discussed first,and the concept of the instant normal compression line is proposed by analyzing the existing theories and experimental results.Based on the creep law,the relationshi...The influences of time on clays are discussed first,and the concept of the instant normal compression line is proposed by analyzing the existing theories and experimental results.Based on the creep law,the relationship between the aging time and the overconsolidation parameter is built.With the reloading equation of the UH model(unified hardening model for overconsolidated clays) used to calculate the instant compression deformation,a one-dimensional stress-strain-time relationship is proposed.Furthermore,the evolution of this relationship is analyzed,and the characteristic rate that is a function of the overconsolidation parameter is defined.Then a three-dimensional elastic-viscous-plastic constitutive model is suggested by incorporating equivalent time into the current yield function of the UH model.The new model can describe not only creep,rate effect and other viscous phenomena,but also shear dilatancy,strain softening and other behaviors of overconsolidated clays.Besides,compared with the modified Cam-clay model it requires only one additional parameter(the coefficient of secondary compression) to consider the creep law.Finally,because the proposed model can be changed into the UH model under instantaneous loading,the elastic-plastic and elastic-viscous-plastic frameworks are unified.展开更多
文摘2005年6月19～24日，第11届国际岩土力学计算方法与进展协会国际会议（11th Conference of International Association for Computer Methods and Advances in Geomeclaanics—IACMAG）在意大利历史名城都灵（Turin）隆重召开，香港理工大学土木与结构工程系殷建华教授荣获“国际岩土力学计算方法与进展协会”（IACMAG）2005年度地区杰出贡献奖。
基金supported by the National Natural Science Foundation of China (Grant Nos. 51179003,11072016,11272031)the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No.20091102110030)
文摘The influences of time on clays are discussed first,and the concept of the instant normal compression line is proposed by analyzing the existing theories and experimental results.Based on the creep law,the relationship between the aging time and the overconsolidation parameter is built.With the reloading equation of the UH model(unified hardening model for overconsolidated clays) used to calculate the instant compression deformation,a one-dimensional stress-strain-time relationship is proposed.Furthermore,the evolution of this relationship is analyzed,and the characteristic rate that is a function of the overconsolidation parameter is defined.Then a three-dimensional elastic-viscous-plastic constitutive model is suggested by incorporating equivalent time into the current yield function of the UH model.The new model can describe not only creep,rate effect and other viscous phenomena,but also shear dilatancy,strain softening and other behaviors of overconsolidated clays.Besides,compared with the modified Cam-clay model it requires only one additional parameter(the coefficient of secondary compression) to consider the creep law.Finally,because the proposed model can be changed into the UH model under instantaneous loading,the elastic-plastic and elastic-viscous-plastic frameworks are unified.
