针对砂土湿化变形计算中N obari法和单线法的不足,采用初应力增量有限元的分析方法,并编制相应的计算程序,对某高速公路路基砂土三轴试验得到的Duncan-Chuang模型参数进行计算分析。分析结果表明,该高速公路砂土路基在长期浸水和车辆荷载作用下,将发生一些附加沉降变形。虽然沉降变形不大,对柔性路面结构的影响较小,但仍然需要引起公路养护部门的重视。 Aiming at the deficiency of N obari method and single-line method in the calculation of sand wet deformation, the method of initial stress incremental finite element analysis is adopted, and the corresponding calculation program is compiled. Based on the triaxial test of Duncan-Chuang Model parameters are calculated and analyzed. The analysis results show that some additional subsidence deformation will occur under the long-term flooding and vehicle loading of the sandy soil subgrade of the expressway. Although settlement is not large deformation, the impact on the flexible pavement structure is small, but still need to cause the highway maintenance department attention.