一环路南段东延线是绵阳市规划二横线的重要组成部分，项目所在区域地形复杂、地质条件恶劣，属于汶川地震影响带，控制条件较多。根据规划要求，结合现状条件及实际地形，道路全线主要结构物有隧道一座、收费站一座、互通立交两座、上跨桥两座，如何优化规划线形，保证工程建设技术经济合理是我们研究工作的重点。%The east extension of southern section of the first circle road is an important part of the road programming project in Mianyang city. It requires multiple control conditions because of the poor geological conditions of the earthquake affected zone. According to the planning requirements, combined with current conditions and the actual terrain, we focused on the design of a tunnel, a toll station, two cloverleaf junctions, and two flyovers. The optimization of linear planning and construction techniques is the key of our research.
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