The stress and strain of railway subgrade of layered system are calculated with Boussinesq formula in equivalent thickness method as per the current standard. Odemark modulus and thickness equivalent assumption are applied in the equivalent thickness method, the thickness of the soil layer with different moduli above the subgrade is converted into equivalent thickness of the same modulus of the subgrade filler, but this method can not truly reflect the difference between the properties of different soil materials, and the functions in the stress field distributions contributed by the ballast layer with high modulus, the bedding surface layer and the bedding bottom layer are not supported by rigorous theoretical basis. For four layers structure system of the heavy haul railway, the layered analytic method theory is used to calculate the stress and deformation at different depth based on transfer-matrix. The comparison of the theoretical results of the Boussinesq formula with the calculation results of homogeneous soil layer verifies the feasibility of the transfer-matrix method and its calculation program. Finally in order to illustrate the rationality of this method, the result of the finite element are compared with that of the transfer-matrix method, and the two methods prove to be in good agreement with each other.%目前现行规范对层状体系的铁路路基基床结构的应力应变计算采用等效厚度法，按Boussinesq公式进行计算，等效厚度法采用Odemark模量与厚度当量假定，将路基上不同模量的厚度土层折算成与路基下部填料同模量的等效层厚，该方法并没有很好反映不同土层材料性质之间的差异，对高模量的道砟层、基床表层、基床底层在路基应力场分布中的作用，缺乏严密的理论依据。针对重载铁路路基4层结构体系，采用基于传递矩阵的层状理论分析方法针对其不同深度处的应力变形求解。通过均质土层的计算结果与Boussinesq公式的理论结果的比较，验证了传递矩阵法及其计算程序可行性，最后为了进一步说明该方法的合理性，对比有限元和传递矩阵法的计算结果，结果表明，二者吻合较好。
展开▼
