随着我国西部大开发的深入发展，山区公路建设方兴未艾。土石混合料作为山区公路填料的重要形式，其工程特性及路用性能的研究成为行业内热点。土石混填路基在循环荷载作用下表现出弹塑性性质，而我国道路设计采用弹性层状理论，两者之间的矛盾成为道路设计领域亟需解决的问题。.本文在分析土石混合料物理力学特性的基础上，引入安定理论，对土石混填路基的应力应变特性进行分析。首先，利用ABAQUS有限元软件建立了行车荷载和道路结构数值模型，并分别通过模型试验进行验证；其次，利用BISAR软件对不同影响因素下的土石混填路基应力进行分析，确定土石混填路基应力水平；最后，对一定应力水平下的土石混填路基安定行为进行数值模拟，确定安定界限。.通过模型试验和数值模拟的数据，分析应力水平、荷载频率及含石量对土石混填路基安定性的影响。通过合理的路面结构设计、材料选择及荷载限制有效保证土石混填路基的安定性，对实际工程具有指导意义。

With the development of western China and the construction of new countryside, the construction of mountain roads is in the ascendant. As an important form of highway filler in mountainous areas, the study of engineering characteristics and road performance of soil and rock mixture has become a hot spot in the industry. The soil and stone mixed subgrade shows the elastoplastic property under the cyclic load, and the elastic layered theory is adopted in the road design of our country. The contradiction between the two becomes an urgent problem to be solved in the field of road design..Based on the analysis of physical and mechanical characteristics of earth-rock mixture, this paper introduces stability theory to analyze the stress-strain characteristics of earth-rock mixed roadbed.Firstly, the numerical models of driving load and road structure are established by using ABAQUS finite element software, which are verified by model tests respectively.Secondly, BISAR software is used to analyze the roadbed stress under different influencing factors to determine the roadbed stress level.Finally, the stability behavior of soil and rock roadbed under certain stress level is simulated numerically, and the stability limit is determined..Through the data of model test and numerical simulation, the influences of stress level, load frequency and stone content on the stability of earth-rock mixed roadbed are analyzed.Through reasonable pavement structure design, material selection and load limitation, the stability of earth-rock mixed fill roadbed can be guaranteed effectively, which is of guiding significance to practical engineering.