对于高速公路拓宽工程必须采取有效的措施,减小新老路基的差异沉降,其中开挖台阶是新老路基结合部常用的技术措施之一。本文以京石高速公路涿州至石家庄段为工程依托,采用有限元方法分析了老路边坡开挖和加宽路堤填筑对老路及路基变形的影响,对高速公路拓宽工程台阶开挖的设计与施工具有指导意义。 For highway widening project, effective measures must be taken to reduce the differential settlement of new and old roadbed. The excavation step is one of the commonly used technical measures in the joint of old and new roadbed. Based on the project of Danzhou to Shijiazhuang of Beijing-Shijiazhuang Expressway, this paper analyzes the influence of old road slope excavation and widening embankment filling on the deformation of old road and embankment by using finite element method. The design and construction of the step excavation of widening expressway Construction has guiding significance.