市域快速轨道交通快慢车混合运行时线路通过能力计算方法

为顺应当前市域快速轨道交通快慢车混合运行的运输组织发展趋势,提出1种可适应不同列车开行方案与开行比例的线路通过能力计算方法。考虑列车最小追踪间隔时间、快慢车开行比例、区间快车越行节约时间、列车在各站的停站时间等重要因素,分越行(设越行站)、追踪(不设越行站)2种运输组织模式,推导所有可能情况下的线路通过能力计算式,构建通用的快慢车混合运行时线路通过能力计算方法;依托广州地铁14号线实际运营数据,计算特定条件下的线路通过能力。结果表明:快慢车开行数量相等时的线路通过能力最小,此时越行模式和追踪模式下的线路通过能力分别为20和13列·h-1;越行模式下,线路最大通过能力为28列·h-1,且随着快车开行数量的增加,通过能力逐渐降低;追踪模式下,以慢车为主和以快车为主的2种开行方案的线路最大通过能力分别为26和30列·h-1,且以快车为主的开行方案的线路通过能力大于以慢车为主的方案。

Calculation Method of Line Carrying Capacity of Regional Rapid Rail Transit under Mixed Operation of Express/Local Trains

In order to comply with the development trend of transportation organization in regional rapid rail transit with the mixed operation of express/local trains,a calculation method of line carrying capacity is proposed,which can adapt to different train operation schemes and operation proportions.Considering such important factors as the minimum tracking interval time,the proportion of express/local trains,the time saving for express trains overtaking in sections and the stopping time of trains at each station,the calculation formulas of line carrying capacity under all possible conditions are derived by dividing the two transportation organization modes of overtaking(with overtaking stations)and tracking(without overtaking stations).The general calculation method for the line carrying capacity under the mixed operation of express/local trains is constructed.Based on the actual operation data of Guangzhou Metro Line 14,the line carrying capacity under specific conditions is calculated.Results show that:the line carrying capacity is the minimum when the number of express and local trains is equal,and the line carrying capacity under overtaking mode and tracking mode is 20 and 13 trains per hour respectively.Under the overtaking mode,the maximum line carrying capacity is 28 trains per hour,and with the increase of the number of express trains,the capacity gradually decreases.Under the tracking mode,the maximum line carrying capacity of the two operation schemes with local trains and express trains as the main modes are 26 and 30 trains per hour respectively,and the line carrying capacity of the scheme with express trains as the main mode is greater than that with local trains as the main mode.