【摘要】 高速公路改扩建历来是公路工程设计的难点之一，既要尽量合理利用现有设施和资源，又要满足改扩建的交通量增长需求和周边区域的合理诉求，需要在技术可行、达标和经济合理且效益较高之间做好平衡。通过对G15高速公路（嘉金段）改扩建工程总体设计的阐述，介绍了项目背景、横断面规模论证、工程范围和平面布置、纵断面布置、横断面布置、立交及出入口布置、施工交通组织等内容，详细论述了如何在横断面规模和横断面布置上实现技术和经济的最优组合，又如何在需求强烈的区域体现按需设计的理念，充分体现了集约化设计理念，希望对解决高速公路改扩建问题能提供一些有益的参考。更多还原

【Abstract】 The reconstruction and expansion of expressways has always been one of the difficulties in highway engineering design, which is not only to make reasonable use of existing facilities and resources as far as possible, but also to meet the demand for traffic growth of reconstruction and expansion, and the reasonable demands of surrounding areas. There is a need to strike a balance between being technically feasible and meeting standards and being economically reasonable and cost-effective. By elaborating the overall design of the G15 Expressway(Jiajin Section)Reconstruction and Expansion Project, the project background, cross-section scale demonstration, engineering scope and plane layout, longitudinal section layout, cross-section layout, overpass and entrance/exit layout, construction traffic organization and other contents are introduced. How to achieve the optimal combination of technology and economy in cross-section scale and layout, and how to reflect the concept of on-demand design in areas with strong demand are discussed in detail, which fully reflect the intensive design concept, and hope to provide some useful references for solving the problems in the reconstruction and expansion of expressways.更多还原