旧路加宽改造对提高既有道路等级和改善路网结构具有较高的技术经济价值。在旧路加宽改造工程的方案设计时需进行多方案的比选 ,同时必须综合分析各方案的地基沉降、路基稳定性、路基静载压缩变形、以及路基土行车荷载作用塑性累积变形等造成的路基表面的不均匀变形 ,以便采取可靠而有效的综合处治方案。 Widening and reconstruction of the old road has high technical and economic value for improving the existing road level and improving the road network structure. At the same time, it is necessary to comprehensively analyze the settlement of subgrade, the stability of subgrade, the compression deformation of roadbed under static load and the plastic cumulative deformation of traffic load on subgrade soil, etc. Of the uneven deformation of the road surface in order to take a reliable and effective integrated treatment program.