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有效应力决定了岩土材料的变形和强度,有效应力概念虽然已在岩土工程中广泛应用,但是,对于决定饱和岩土材料抗剪强度的有效应力,其理论解释至今却并不充分且受到质疑。为此,通过文献分析,确定了宏观抗剪强度与粒间摩擦强度之间的正相关关系,并运用摩擦学中的黏着摩擦理论,推导了排水和不排水条件下,粒间接触面黏着结点的生长公式和抗剪强度公式。通过对比分析这两种条件下的应力状态对抗剪强度的作用影响,得到了与Terzaghi一致的有效应力表达式,并在此基础上,探讨了有效应力和有效应力原理的基本概念和定义。
The effective stress determines the deformation and strength of geomaterials. Although the concept of effective stress has been widely used in geotechnical engineering, the theoretical explanation for the effective stress that determines the shear strength of saturated geomaterials has not been sufficient so far question. Therefore, through the literature analysis, the positive correlation between macroscopic shear strength and intergranular frictional strength has been determined, and the theory of adhesion friction in tribology has been used to deduce the adhesion between particle interface under drainage and undrained conditions Point of growth formula and shear strength formula. By comparing and analyzing the effect of the stress state on the shear strength under these two conditions, the effective stress expression consistent with Terzaghi is obtained. Based on this, the basic concepts and definitions of effective stress and effective stress principle are discussed.