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在法向荷载和切向荷载的作用下岩体节理的剪切应力由抗剪断效应、剪胀效应和摩擦效应所引起的三部分应力构成,但三个组成部分在节理的剪切过程中并不是同时发挥其最大作用。在详细分析边坡岩体节理工程地质特性的基础上,提出一种节理分量式剪切本构模型,主要特征为(1)体现了剪胀与剪切之间的耦合效应;(2)采用分量式表达,物理意义更明确;(3)每一分量采用简单函数,避免了总量式分段构造函数的不足。在节理分量式本构模型基础上,提出应用于岩质节理边坡的双安全系数的概念和求解原则,双安全系数能够较好地反映岩体节理剪切破坏直至残余强度的物理过程。最后,通过双安全系数算例明确了各个分量对于边坡稳定性的贡献。
Under normal load and tangential load, the shear stress of rock mass joints is composed of three parts of stress caused by shear resistance, dilatancy and friction effect. However, Not at the same time to play its biggest role. Based on the detailed analysis of geologic characteristics of rock mass joints, a joint component shear model is proposed. The main features are as follows: (1) The coupling effect between dilatancy and shear is reflected; (2) Component expression, the physical meaning more clearly; (3) each component using a simple function, to avoid the lack of the total amount of segmentation constructor. Based on the joint constitutive model, the concept and principle of double safety factor applied to rock slope are put forward. The double safety factor can well reflect the physical process of shear failure of rock mass joints up to the residual strength. Finally, the contribution of each component to the slope stability is clarified by the double safety factor example.