随着社会经济的快速发展,我国早期建成的部分高速公路线路和路段交通量饱和,运输能力紧张,运输效率下降,服务质量降低,已不能很好地适应社会经济建设发展的需求,高速公路改扩建已成为当前我国交通基础设施建设的重点任务之一。“十五”以来,一些省市区陆续开展了部分高速公路实施改扩建工程。然而,各地在实施改扩建时存在着建设方式方法差别较大、建设理念和指导原则不统一、对关键技术指标的理解存在异议等问题,迫切需要建 With the rapid development of economy and society, some expressways in the early part of our country were saturated with traffic volume and transport capacity were tense, transport efficiency was deteriorated, service quality was reduced and some of the expressways in our country were built up earlier than the previous years, which are no longer well adapted to the needs of social and economic development. Expansion has become one of the key tasks of China’s transportation infrastructure construction. Since the “Tenth Five-Year Plan”, some provinces, autonomous regions and municipalities have successively carried out reconstruction and expansion projects on some expressways. However, there are problems in the implementation of reconstruction and expansion such as large differences in construction methods, inconsistent construction concepts and guiding principles, and dissenting understanding of key technical indicators.