摘要
引用平均土骨架应力的概念,研究推导出非饱和土的刚度参数随吸力变化而变化的关系式,进而推导得到用平均土骨架应力表述的非饱和土LC屈服面函数以及硬化规律。从土力学原理推导,得到土样由于在净应力和吸力作用下产生体积变形引起土样饱和度变化的关系式。由平均土骨架应力推广,得到三轴应力状态的椭圆屈服函数,这一非饱和土本构模型的优点在于考虑了应力作用后土样饱和度的变化,通过对已有试验数据的初步验证,表明提出的非饱和土本构模型的合理性和适用性。
The concept of ＂average soil skeleton stress＂ is introduced. The stiffness parameters of unsaturated soils, λ（s）, κ（s）, λs and κs, have been derived. The LC yield function, hardening rule and the ellipse yield function of triaxial stress state have been also studied. Based on the physical processes and mechanism of the soil mechanics, the change relationship between the degree of saturation and the volume strain of the soil has been presented by the net mean stress and suction action. The advantage of the constitutive model of unsaturated soils is that it can take into account the important parameters of the degree of saturation in different stress states. The verification results of the partial test data show that the constitutive model is available.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第5期855-860,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.40374047)
关键词
非饱和土
土本构模型
饱和度
LC屈服
硬化规律
unsaturated soil
constitutive model
degree of saturation
LC yield
hardening rule
