基于道路设计与交通规划的道路选线优化模型

结合道路设计理论与交通规划理论,以地理信息系统为平台,开发道路选线优化模型。该模型是一个费用指向的优化问题,最小化费用目标函数中包括道路建设费用、土方工程费、道路交通诱发的环境污染的不经济费用,OD交通在路网上总走行时间的时间费用等。优化模型首先随机生成新建道路的空间位置候选方案集,并自动设计新建道路的平曲线和竖曲线,计算新建道路的各项工程费用。然后,对变化的路网进行自动拓扑,通过交通量分配得到OD交通在新路网上的走行时间和交通流特征,计算OD交通的环境负荷。最后,在遗传算法中判断候选方案的优劣,直到得到一个最佳的新建道路的空间位置方案为止。

Optimization of Road Route and Alignment based on Road Engineering and Transport Planning

A model for optimization of road route and alignment is developed based on road design theory,transport planning theory and GIS platform.It is a cost-oriented optimization including,construction cost,earthwork cost,environment damage cost arising from road traffic,time cost of total OD travel time are included in the objective function.First candidates of route for the constructed road are generated randomly,then horizontal and vertical curves of the road are designed automatically and all of the engineering related cost is calculate.Secondly topology of the changed road network is constructed automatically,and the travel time and flow characteristics of OD traffic on the network is obtained based on traffic assignment,then traffic environment loads on the network is estimated.At last,all the candidates are judged with genetic algorithm,and the calculation does not stop until the route and alignment are optimized.