高速铁路通过能力利用状态评估方法研究

Research on Assessment of Utilization of Carrying Capacity for High-speed Railway

通过能力利用率是评估高速铁路通过能力利用状态的重要指标。首先基于相同和不同速度等级列车运行组计算停站、越行导致的额外占用时间;其次,考虑列车运行过程的动态、不确定性特征,在分析低层次、高层次晚点传播的基础上计算平均缓冲时间;第三,在时间维度上,将追踪列车间隔时间、额外占用时间、缓冲时间之和作为列车占用总时间,以列车占用总时间与列车运行图有效开行时间带的比值计算通过能力利用率;最后,以京广高速铁路为例进行验证。所提出的通过能力利用状态评估方法能够体现列车停站方案、运输服务质量等对通过能力利用率的影响,更好地反映运力资源运用效率。

Capacity utilization rate is crucial in evaluating the carrying capacity utilization status of high-speed railway.In this paper,additional occupation time caused by train stop and overtaking,was calculated firstly based on train operation groups of the same speed grade and different speed grade.Secondly,considering the dynamic and uncertain characteristics of the train operation process,average buffer time was calculated based on the propagation of train delays at a low level and at a high level.Thirdly,in the time dimension,total train occupancy time was acquired as the sum of the train tracking headway time,the additional occupation time and the buffer time.Capacity utilization rate was obtained by the ratio of the total train occupancy time to the effective time of the train timetable.Finally,the case study of the Beijing-Guangzhou high-speed railway was conducted to verify the method.The carrying capacity assessment method proposed in this paper,can describe the impact of the stop plan and transportation service quality on the capacity utilization rate,and reflect the utilization efficiency of the capacity resources better.