非饱和土抗剪强度公式分类及总结

Classification and Summary of Shear Strength Formulae for Unsaturated Soils

将众多非饱和土抗剪强度公式分为结合土-水特征曲线、数学拟合、分段函数、总应力指标及其他形式5类,分析了当前非饱和土抗剪强度公式的特点及研究不足。结果表明:有效应力抗剪强度公式和双应力状态变量抗剪强度公式的力学本质不同,吸附强度表达式的不同导致了抗剪强度公式的多样性,急需加强非饱和土真三轴试验研究,建立符合工程实际受力状况的非饱和土强度理论,完善非饱和土的理论基础,并加快非饱和土强度理论的工程实践与应用进程。

The shear strength formulae for unsaturated soils were divided into five categories, such as using soil-water characteristic curve, mathematical fitting, piecewise functions, total stress indicators and other forms. Characteristics and deficiencies of the current research on shear strength formulae for unsaturated soils were analyzed. The results show that some differences in mechanical significance exist between shear strength formulae based on the effective stress and shear strength formulae based on the two-stress state variables. Different expressions of suction strength lead to diversities of the shear strength formulae. True triaxial tests of unsaturated soils are urgent need to be carried out and strength theory of unsaturated soils satisfying the actual engineering stress conditions is to be established in order to improve the theoretical basis of unsaturated soils and accelerate the process of engineering applications.