北京地铁4号线-大兴线增购车辆项目实施研究

2010年,大兴线与4号线实现贯通运营后,日均客流量日益增加。虽然运营间隔从3min缩短到2min,但运能供需矛盾仍日益紧张,车辆备车也严重不足。因此增购车辆、扩建停车库的工作被提上日程。从信号系统的角度对增购车辆项目进行研究,通过分析工程的可行性,以及施工难点、施工过程,探寻先进移动闭塞系统对于缩短轨道交通发车间隔的帮助,从而提升系统运能和载客量。

Evaluation method on bus arrival headway reliability

To accurately capture the measurement of bus reliability and evaluate whether the transit system is properly operated an evaluation framework is established to assess the reliability of the transit system from different stratifications including stops routes and network levels.The bus operation data of the Hefei city is analyzed as a case study.Comparison is conducted to show the improvement made by using the advanced method and an example of adding exclusive bus lanes to the existing bus route is provided. The proposed advanced method can avoid the shortcomings of the traditional method.For example the value of the reliability using the traditional coefficient of variation CV is not between 0 and 1 and the value of reliability can decrease with the increase in the transit headway etc. The case study shows that the advanced method can represent the real operation condition of the transit system and can be used to evaluate the transit headway reliability more reasonably.

无锡地铁2号线站前折返信号仿真分析与改进

以无锡地铁2号线安镇站为例,通过信号系统仿真,对2种传统站前折返方式进行了详细分析,发现其折返能力不能满足运营间隔120 s的设计要求,未来将对线路运输能力产生影响。为此,提出了2种改进该站折返能力的方案,即更换道岔和采用新的折返运营方式,可供运营单位参考。