道路桥梁目录目录前言....................................................................31绪论...................................................................41.1选题背景........................................................41.1.1我国公路现状.............................................41.1.2我国公路发展规划.........................................51.2本设计的基本情况................................................62选线...................................................................72.1选线步骤........................................................72.2定线.............................................................72.2.1试坡.......................................................72.2.2定导向线..................................................82.2.3平面试线..................................................82.2.4修正导向线................................................82.2.5定线.......................................................82.3方案比选.........................................................83路线平面设计..........................................................103.1平面设计技术指标的确定.........................................103.1.1直线......................................................103.1.2圆曲线...................................................103.1.3缓和曲线.................................................103.2平曲线计算......................................................113.2.1导线要素计算.............................................123.2.2平曲线要素计算...........................................133.2.3主点桩号设置.............................................184路线纵断面设计......................................................204.1纵坡设计要求...................................................204.1.1纵坡......................................................204.1.2坡长.....................................................204.1.3缓和坡段.................................................214.2竖曲线设计......................................................214.2.1竖曲线半径...............................................214.2.2竖曲线要素计算................