摘要
为确定高速公路互通式立交单车道出口小客车运行速度特征和运行速度值,确保车辆在衔接段运行速度协调可控,使车辆安全运行,在分析高速公路互通式立交单车道出口小客车运行速度实测数据的基础上,得出车辆在出口处的运行规律。采用链式开普勒雷达测速仪对出口小客车速度进行实时采集,选取8条匝道特征点(渐变段起点、分流点与小鼻点)处自由流状态下的小客车速度作为分析样本,采用K-S检验对所取样本进行正态分布检验,在满足检验要求并分析渐变段和减速段速度及加速度特性后,确定自变量参数,最后利用SPSS软件进行回归,分别建立了小客车在分流点及小鼻点处运行速度预测模型,并采用4条匝道数据对模型进行了验证。结果表明:分流点处车辆运行速度随渐变段起点速度增大而增大,随渐变段长度增大而减小;小鼻点处车辆运行速度随渐变段起点速度增大而增大,随渐变段长度、渐变段长与减速段长之比r的增大而减小;预测模型通过了回归等式及回归参数的显著性检验和相对平均误差检验,模型预测值与实测值的相对误差平均值均小于10%,建立的回归模型满足精度要求。
In order to determine the characteristics and values of the operating speed of passenger cars at the single-lane exit of the interchange and ensure the coordination of operating speed in the convergence section for vehicle safety, the measured data of the operating speed of passenger cars on the freeway interchange was analyzed, and the operation rules of the vehicle at the exit were obtained. The chain kepler radar velocimeter was used to collect vehicle speed in real-time. The feature points （including the starting point of the tapered section, diversion point and the small nose point） of eight ramps were selected as the analysis sample of the vehicle speed in the free flow state. K-S test was used to test the normal distribution of samples. After meeting the requirements and analyzing, the speed and acceleration characteristics in the tapered section and deceleration section, the parameters of the independent variables were determined. Finally, SPSS software was used to make the regression, and the operating speed prediction model of passenger cars at diversion points and small nose points were established. Then the model was verified by data of four ramps. The results show that the operating speed at the diversion point increases with the increasing speed at the starting point in the tapered section, and decreases with the increasing length of the tapered section. The operating speed at the small nose point increases with the increase of operating speed at the starting point in the tapered section and decreases with the increase of length of the tapered section and the ratio of tapered section length and deceleration section length. In addition, predicted model is successfully tested by regression equation, regression parameters and the average relative error. The relative error of the predicted value and measured value is less than 10%, so the established regression model meets the accuracy requirements.
作者
张驰
闫晓敏
李小伟
潘兵宏
王海君
马向南
ZHANG Chi YAN Xiao-min LI Xiao-wei PAN Bing-hong WANG Hai-jun MA Xiang-nan(Key Laboratory of Highway Engineering in Special Area of Ministry of Education, Chang＇an University, Xi＇an 710064, Shaanxi, China CCCC First Highway Consultants Co. , Ltd. , Xi＇an 710075, Shaanxi, China Hubei Provincial Communications Investment Group Co. , Ltd, Wuhan 430074, Hubei, China Guangzhou Expressway Ltd. , Guangzhou 510028, Guangdong, China Central and Southern China Municipal Engineering Design Institute Limited, Wuhan 430010, Hubei, China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2017年第6期279-286,共8页
China Journal of Highway and Transport
基金
"十二五"国家科技支撑计划项目(2014BAG05B01)
交通运输部应用基础研究项目(2014319812170)
中国博士后科学基金项目(2016M590915)
广东省交通科技项目(2013-02-059)
中央高校基本科研业务费专项资金项目(310821172002
310821172201)
陕西省自然科学基础研究计划面上项目(2017JM5013)
关键词
交通工程
运行速度预测模型
SPSS回归分析
匝道出口
渐变段
减速段
traffic engineering
operating speed prediction model
SPSS regression analysis
ramp exit
tapered section
decelerating section
