设计方案是影响工程投资的重要因素,也是评价总设计方案经济合理的指标。根据省道常付线上跨与下穿京珠高速公路设计方案的对比分析,从技术可行性、安全性、工程投资等方面进行比选,得出下穿更具有合理可行的结论。文章通过对上跨与下穿方案在施工技术、安全性、工程造价等方面进行综合分析和该项目下穿施工的成功实施,认为下穿方案更加合理可行,它具有工程造价低,对高速公路的通行影响小,工期较短等优点,符合“技术先进、安全可靠、使用耐久、经济合理”的设计原则,故在跨越高速公路中采用下穿设计方案是可行和安全的。 The design plan is an important factor that affects the project investment and is also an index for evaluating the overall design plan’s economic rationality. According to the comparative analysis of provincial cross-border on-line and under-cross-section design of Beijing-Zhuhai expressway, this paper makes a comparison between technical feasibility, safety, project investment and so on, and draws a conclusion that under-wear is more reasonable and feasible. Through the comprehensive analysis of construction technology, safety and construction cost and the successful implementation of the project under construction, the article thinks that the under-wear plan is more reasonable and feasible, and it has the advantages of low construction cost, It has the advantages of small passage time, short construction period, etc., and conforms to the design principle of “advanced technology, safe and reliable, durable use and economic rationality”. Therefore, it is feasible and safe to adopt the underpass design scheme across the expressway.