针对高速公路拓宽工程中新老路基差异沉降对路面结构的显著影响,应用有限元程序,建立了差异沉降下路面结构应力的计算模型,分析了路面结构参数对拓宽道路的影响,并采用正交分析法进行了结构层参数变化的敏感性分析。结果表明,路面各结构层的附加应力随着不均匀沉降量的增大而增大,随着不同结构层厚度和模量的增大而有相应的增大或减小,对不同路面结构层的附加应力而言,各因素的影响程度不同,对基层顶面附加拉应力而言,基层厚度和模量的变化对其影响最大。%Based on the significant impact of the pavement under differential settlement between new embankment and old embankment in expressway extension project, the finite element method is used to calculate the stress states of the pave- ment under the differential settlement, the influence of pavement structure parameters on additional stress in widened road is analyzed, and the sensitivity of structure parameters are also analyzed with orthogonal method. The research results show that the additional stress of each layer would be increased along with the increasing of differential settlement, and would be increased or reduced correspondingly along with the increasing of the thickness and module of different struc- ture. The important degree of various factors is dissimilar for different additional stress of pavement structure, and the in- fluence of change of the base thickness and module is biggest for the tensile stress of the base top.
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