内河航道可接受间隙理论模型改进及其应用

Improvement and application of the gap acceptance theory's model at inland waterway

为更好地计算内河航道交叉口通过能力,提出空档率的概念,对可接受间隙理论模型进行改进,认为船舶尺度大、船头时距不能全部用于船舶穿越。总结平流区域避让规则,将T型交叉口各向交通流划分为3个等级,并考虑高等级流向的阻抗影响,给出基于优先权的T型交叉口各流向通过能力计算方法。以苏申内港线——申张线T型交叉口为例进行分析,结果表明通过能力随冲突交通量的增大成负指数规律减小,且当冲突交通量一定时,通过能力随速度呈缓-快-缓趋势增长,取穿越船平均航速(0.8倍设计速度)计算通过能力是合理的。

In order to calculate the passing capacity of inland waterway preerably, the concept of gap rate and improves the gap acceptance theory＇s model is proposed which considers that ship length is large and not all the bow can be used for the ship to move through.At the same time, it summarizes the rules of collision avoidance at slack water area and determines the three priorities of anisotropic traffic flow of the T-type intersection.Taking into account the influence of impedance effect of high level flow, the calculation method of T-type intersection traffic flow based on the priority is derived. Taking the T-type intersection of Sushenneigang waterway-Shenzhang waterway as an example, the analysis indicates that passing capacity gradually decreases with the increase of conflict traffic and the decreasing trend is the negative exponential distribution. When the conflict traffic is fixed, the passing capacity gradually increases with the increase of speed and the changing trend is slow-fast-slow.Therefore, it is reasonable to calculate passing capacity using avarage speed（eighty percent design speed）.