中文摘要：

根据北京快速环路的交通流特性及出入口间距短、交织严重的特点，改进了基础模型METANET的节点模型和路段模型，在此基础上，建立了非线性最优控制模型，给出了离散性最优出入口协调控制系统解．以北京二环快速路为实例，将采用改进最优控制（AMOC）策略的仿真结果与实测环路数据的交通状态进行比对，结果表明采用改进AMOC能使快速路交通流密度维持在期望的密度范围内，排队长度也较小，路网所有车辆旅行总时间下降18．4％．

英文摘要：

The rutting of asphalt pavement is always one of the research focuses in road engineering. In this paper, the original image of AC-13C asphalt mixture during the APA rutting test and the corresponding sectional images after the loading respectively for 500, 1000, 2000, 4000 and 6000 times were acquired, and the movement track of coarse particles was analyzed according to the images. The results show that the digital image processing technology has great capability in movement tracking of coarse particles, and that, by defining the rotation angle θ, the displacement L and the statistics △ and α, the complicated particle movement in different loading stages during the APA rutting test can be well described and quantified.