黄土路堑边坡的综合坡率是黄土边坡设计的一个重要参数。根据开挖卸载后坡体应力重分布的特征,建立土体应力松弛函数,将边坡问题简化为平面应变问题;采用泛函理论,结合热力学定律及负指数概念,考虑土体的破坏条件,得到黄土边坡的综合坡率理论公式。实例应用结果表明:该理论公式计算得到的综合坡率和采用工程地质类比法得到的结果基本一致。 The comprehensive slope of loess cutting slope is an important parameter of loess slope design. According to the characteristics of slope stress redistribution after excavation and unloading, the stress relaxation function of soil is established to simplify the slope problem to the problem of plane strain. Based on the functional theory and the thermodynamics law and the concept of negative exponent, the failure condition of soil is considered, The theoretical formula of comprehensive slope rate of loess slope is obtained. The results of practical application show that the comprehensive slope calculated by the theoretical formula is basically the same as that obtained by engineering geology analogy method.