Abstract: The mixture of aggregate has non-linear property, in this paper takes the modulus of elasticity as the function of main and minor stress. Through the finite element model and ordinary tests, get the main and minor stress of each element, and then find the parameters of the model. The result show that the model in this paper suits the mechanics characteristic of the pavement better, and has high theory value in non-linear pavement analysis

Key words: non-linear model, finite element, main minor stress, aggregate

摘要： 砂砾石组成的混合料具有明显的非线性特点，为反映混合料的这种特点，笔者在文中将混合料的模量视为 大、小主应力的函数.通过建立有限单元模型，并以常规试验为依托，将计算各单元的大、小主应力，进而回归出反 映模量与应力关系的参数.分析结果更符合路面结构的实际受力情况，对非线性路面结构的力学分析具有一定的 理论参考价值.

关键词: 非线性模型, 有限单元, 大、小主应力, 砂砾石