黏性土的应力-应变关系归一化性状探讨

Normalization Character of Stress-Strain Relations for Clays

土的应力-应变关系与固结压力水平密切相关,体现为土的归一化性状。针对黏性土固结不排水剪切试验的应力-应变关系,对黏性土归一化性状的存在条件进行了探讨分析,认为黏性土应力-应变关系归一化性状的存在与否取决于土的模量与归一化因子的正比关系及土的抗剪强度特性,通常采用围压σ3和平均固结压力σm作为归一化因子;研究表明当应力-应变关系为Kondner双曲线方程形式,对于采用围压σ3和平均固结压力σm归一化效果很差的黏性土,若采用(σ3)n或(σm)n(选取适当的n值)进行归一化,则效果较好。

Stress-strain relations for soils depend heavily on consolidation stress. The relativity appears as normalization character of clays. This paper analyses the normalization condition of stress-strain relation for clays in triaxial Cu test. It is considered that the normalization character present or absent in clays depends on the positive correlation between soil modulus and normalization parameter and shear strength characteristics of soil. It was usually adopted that peripheral stress σ3 and average consolidation stress σm serve as normalization parameters. This paper puts forward and validates a new normalized parameter. If stressstrain relation of soils is considered as Kondner hyperbolic function, and （σ3）^n and （σm）^n are adpoted as normalization parameters, the normalization degree of the clays is very high. Normalization character of stress-strain relation of the soils is bad when σ3 and σm serve as normalization parameters.