文章依托沪宁高速公路扩建工程,分析了高速公路扩建工程面临的若干新老路基拼接问题。通过现场大量的动力锥贯入仪(DCP)试验和数据分析,对DCP在路基拼接中的应用进行了研究,研究结果对于老路边坡削坡厚度、开挖台阶尺寸的确定、老路硬路肩下的软弱路床判定、路基拼接部位的压实质量快速判断有良好的指导意义。 Based on the expansion project of Shanghai-Nanjing Expressway, the article analyzes the splicing problems of some new and old subgrade facing the expressway expansion project. The DCP experiment and data analysis are used to study the application of DCP in roadbed splicing. The results of the study are as follows: For the thickness of the old road slope, the size of the excavation step, Of the weakness of the bed to determine the speed of subgrade stitching compaction quality has a good guide.