路网通行能力降级对区域道路基础设施服役性能影响分析

Analysis of the influence of road network capacity degradation on the service performance of regional road infrastructure

为提高设施服役性能预测模型的准确度,就路网通行能力降级对区域内道路基础设施服役性能的影响展开了量化研究。从区域路网角度出发,提出了基于路网整体出行成本影响的设施关键度评价指标Km,用以确定对路网通行能力影响显著的区域关键路段。鉴于现有的性能预测模型未考虑突发性损毁事件导致的路网通行能力降级,依据等效荷载作用建立了路网通行能力降级下区域内道路基础设施服役性能预测模型的修正方程,并结合工程实例对方程的修正效果进行了验证。研究结果表明:关键度评价指标Km不仅可用于评价区域内各设施对路网通行能力的影响,还能反映路网通行能力的抗损毁性能;经修正方程处理后的性能预测值与实测值的演化规律基本相符,该修正方程具有良好的修正效果。

In order to improve the accuracy of the infrastructure service performance prediction model,a quantitative study is carried out on the influence of road network capacity degradation on the service performance of regional road infrastructures.From the perspective of regional road network,a facility criticality evaluation index Km based on the influence on the overall travel cost of the road network is proposed to determine the regional key sections that have a significant influence on the traffic capacity of road network.Since the existing performance prediction model does not take into account the degradation of road network capacity caused by sudden damage events,the revised equation of regional road infrastructure service performance prediction model under the degradation of road network capacity is established according to the equivalent load,and the revised effect of the equation is verified with an engineering example.The results show that the criticality evaluation index Km can not only be used to evaluate the influence of regional facilities on road network capacity,but also reflect the anti-damage performance of road network capacity.The performance prediction values treated by the modified equation are basically consistent with the evolution law of the measured values,and the modified equation has a good correction effect.