对于老路拓宽高路堤,其内部受力和变形变得更加复杂,因而更有必要分析其内部受力与变形状态。文章以沪蓉西高速公路贺家坪连接线老路拓宽实际工程为背景,运用专业软件包GeoStudio2004中SIGMA/W模块,对旧路拓宽高路堤的力学响应特性进行仿真分析。重点分析了新旧路基不均匀沉降变形及应力分布的规律,比较了新老路基土模量差异对路基整体受力变形特性的影响。 For the old road widening high embankment, the internal force and deformation become more complex, so it is more necessary to analyze the internal force and deformation. Based on the old project of Hejianping connecting line of Shanghai-Chengdu Expressway, the paper uses the SIGMA / W module of GeoStudio2004, a professional software package, to simulate the mechanical response of the widened old embankment. The deformation and stress distribution of uneven settlement of old and new subgrade are analyzed emphatically. The influence of the difference of soil modulus between new and old subgrade on the whole deformation of subgrade is compared.