城市快速路平行式加速车道长度计算方法

发布时间：2018-02-20 07:18

本文关键词： 交通规划快速路平行式加速车道车道长度可变间隙三级服务水平　出处：《交通运输工程学报》2017年04期 　论文类型：期刊论文

【摘要】：比较了现行中美规范平行式加速车道长度计算方法的差异,结合运动学模型和可接受间隙理论,在考虑主线交通水平、初始速度与可变间隙3种影响因素的基础上,建立了城市快速路平行式加速车道长度计算模型,采用蒙特卡洛方法求解模型,分析了3种影响因素对加速车道长度的影响,并提出了一种基于期望初始速度和期望主线交通水平的加速车道长度确定方法。分析结果表明:3种影响因素对加速车道长度有较大的影响,在不同设计时速下,《城市快速路设计规程》(CJJ129—2009)规定的长度最小值均小于仿真值,在设计时速为100km·h~(-1)时,三级服务水平上下限的加速车道长度分别比规定的最小值大27~36、9~27 m,在设计时速为80km·h-1时,分别大10~22、4~24m,在设计时速为60km·h~(-1)时,分别大15~24、13~30m;随着初始速度的减小,加速车道长度呈现增大趋势;在相同条件下,第4种临界间隙函数的加速车道长度最大,而第1种临界间隙函数的加速车道长度最小,表明临界间隙越大,需要的加速车道就越长;不同设计时速下三级服务水平上下限加速车道长度和初始速度的二次函数拟合度为0.865 8~0.999 7,因此,整体拟合效果良好。可见,本文的快速路平行式加速车道长度计算方法合理、可靠。
[Abstract]:In this paper, the differences in the calculation methods of parallel acceleration lane length between China and the United States are compared. Combined with kinematics model and acceptable clearance theory, the main line traffic level, initial speed and variable clearance are considered. The parallel acceleration lane length calculation model of urban expressway is established. The Monte Carlo method is used to solve the model, and the influence of three factors on the acceleration lane length is analyzed. An accelerated lane length determination method based on the expected initial speed and the expected main line traffic level is proposed. The results show that the three influencing factors have great influence on the acceleration lane length. Under different design speeds, the minimum length prescribed by CJ129-2009) is smaller than that of simulation. When the design speed is 100 km 路h ~ (-1), The length of the acceleration lane at the upper and lower limit of the third level is 27 / 36 / 927m longer than the prescribed minimum, respectively. When the design speed is 80 km 路h ~ (-1), the length of the acceleration lane is 10 ~ 22 / h ~ (-1), respectively, while the design speed is 60 km 路h ~ (-1), the length of the acceleration lane increases with the decrease of the initial speed. Under the same conditions, the acceleration lane length of the fourth critical clearance function is the largest, while the first critical gap function is the smallest, indicating that the greater the critical gap, the longer the acceleration lane is required. The quadratic function fitting degree of the upper and lower limit acceleration lane length and initial speed of three levels of service at different design speeds is 0.865 80.999 7, so the overall fitting effect is good. It can be seen that the calculation method of parallel acceleration lane length in this paper is reasonable. Reliable.
【作者单位】：东南大学交通学院;南阳农业职业学院农业机械化系;
【基金】：国家自然科学基金项目(61573098)
【分类号】：U491.22

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