中文摘要：

分析了地下快速路出入口选址时要考虑的需求距离递减特性、分担率以及集散效率3个因素,以集散效率最大化为目标,建立了针对地下快速路的集散点选择模型。利用均衡分配模型,提出地下快速路分担率求解的迭代算法,求解趋于稳定的分担率以及集散效率最大化情况下的集散点位置。最后给出一个算例,对提出的模型和迭代算法的可行性进行了验证。研究结果表明：集散点选择模型能够求得最优解,迭代算法能够使分担率趋于稳定、模型收敛,最终使集散点实现全局最优。

英文摘要：

Authors analyzed the location problems involving distance decay, share rate, and depot efficiency on the passageways of urban underground expressway. The depot choice model was built with the object of maximum depot efficiency, and an iterative arithmetic making use of equilibrium assignment model was developed to steady share rate and to get depot locations with the maximum efficiency. Finally, an example was presented to illustrate the feasibility of the model and iterative arithmetic. The results show that optimal solution can be obtained by depot choice model. The iterative arithmetic can steady the share rate and can make the model convergent, and the depot locations will be optimized in whole.