道路桥梁专业毕业论文.doc

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1、道路桥梁专业毕业论文目录1路线设计·······················································11.1线形设计一般原则············································11.2平面线形要素的组合类型······································11.3平面设计方法················································21.4平曲线设计····································

2、··············21.5纵断面设计··················································41.6横断面设计··················································52路基路面设计····················································72.1一般路基设计················································72.2软基处理··························

3、··························82.3路基防护···················································92.44支挡结构设计···············································92.5路面结构设计···············································102.6路基土石方数量计算及调配···································113路基路面排水设计·····················

4、·························143.1路基排水设计···············································143.2路面排水设计···············································144涵洞基本构造··················································144.1圆管涵·····················································144.2盖板涵···············

5、······································155设计计算表···················································6参考文献······················································7结束语························································441路线设计1.1线形设计一般原则(1)平面线形应与地形、地物相适应，与周围环境相协调在地势平坦的平原微丘区，路线以方向为主导，平面线

6、形三要素中以直线为主；在地势起伏很大的山岭重丘区，路线以高程为主导，为适应地形，曲线所占比例较大。直线、圆曲线、缓和曲线的选用与合理组合取决于地形地物等具体条件，不要片面强调路线以直线为主或曲线为主。(2)保持平面线形的均衡与连贯①长直线尽头不能接以小半径曲线。长直线和大半径曲线会导致较高的车速，若突然出现小半径曲线，会因减速不及而造成事故。②高、低标准之间要有过渡。同一等级的道路由于地形的变化在指标的采用上会有变化，同一条道路按不同设计速度的各设计路段之间也会形成技术标准的变化。(3)平曲线应有足够的长度汽车在曲线路段上行驶，如果曲线过短，司机就必须很快的转动

7、方向盘，这样在高速行驶的情况下是非常危险的。同时，如不设置足够长度的缓和曲线，使离心加速度变化率小于一定数值，从乘客的心理和生理感受来看也是不好的。当道路转角很小时，曲线长度就显得比实际短，容易引起曲线很小的错觉。因此，平曲线具有一定的长度是必要的。为了解决上述问题，最小平曲线长度一般应考率下述条件确定：①汽车驾驶员在操纵方向盘时不感到困难一般按6s的通过时间来设置最小平曲线长度，当设计车速为60km/h时，平曲线一般值取200m，最小值取125m。②小偏角的平曲线长度当路线转角α≤7°时称为小偏角。设计计算时，当转角等于7°时，平曲线按6s行程考虑；当转角小于

8、7°时，曲线长度与α成反