道路交通网络脆弱性评估

摘要

To identify road network vulnerability, this article introduces the threshold of travel time increase σ to account for the travel time uncertainty, and a penalty parameter ε is introduced to capture the change of traffic demand. A model is then built to evaluate the road network vulnerability by calculating the travel time and demand loss during segment breakdown. Numerical results are provided based on the Dial's network, which show that the model can accurately and realistically capture the source of vulnerability compared to traditional models.%为了更准确地评估道路交通网络脆弱性,本文在用户出行时间变化与路网出行需求变化的基础上引入出行时间增加率阈值σ以及出行需求惩罚参数ε,并以此构建了路网脆弱性评估模型.该模型通过各路段失效后的用户出行时间损失以及路网出行需求损失,对各路段的脆弱性评估值进行计算,并通过网络服务效率评价指标对路网整体脆弱性进行评估.最后,本文以Dail网络对所构建的脆弱性评估模型进行算例分析,并与未加入δ和ε的传统模型进行对比.分析结果表明该模型可以准确识别路网中的脆弱源,计算结果更符合实际情况.