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旧路改建工程有其自身的特点。在考虑公路路基柔性基底及荷载梯形分布的基础上,得到了基底承载力满足路基自重要求的临界荷载公式。考虑老路路基的欠压实、拓宽路基下软弱地基的固结沉降及新老路基结合部不协调变形等情况,分析了新老路基不均匀沉降模式。结合X021线石门～盘塘公路夹山～盘塘段改建工程实践,开展动力触探试验,针对路基改、扩建现场情况提出相应的施工方法,对全线新老路基的施工有一定的指导作用。
Old road reconstruction project has its own characteristics. Based on the consideration of the flexible foundation and the trapezoidal distribution of the roadbed, the critical load formula that the bearing capacity of the foundation satisfies the roadbed self-weight is obtained. Considering the under-compaction of the old roadbed, widening the consolidation and settlement of the weak foundation under the roadbed and the uncoordinated deformation of the junction between the old and new subgrade, the uneven subsidence pattern of the old and new subgrade is analyzed. Combined with X021 line Shihmen ~ PanTang Highway JiaShan ~ PanTang section reconstruction project practice, the dynamic penetration test was carried out. Corresponding construction methods were proposed for the roadbed reconstruction and expansion site conditions, which will guide the construction of new and old roadbed across the board.