摘要
坑槽是沥青混凝土路面的重要病害形式之一,产生后将影响行车舒适与安全,但目前缺乏准确、系统的坑槽区域行车舒适性评价方法。在路面坑槽区域模型分析的基础上,分析轮胎与坑槽底部的接触状态,确定坑槽有效深度;以此为基础,建立车辆振动模型,获得车辆经过坑槽区域时的人体加速度时程曲线,进而以加权加速度均方根值为指标评价行车舒适性;分析坑槽深度、坑槽平面尺寸、车速、路面纵坡对行车舒适性的影响,提出行车舒适性评价方法。研究结果表明:当坑槽长度L≥2√2rh-h^2时,坑槽有效深度hv=h,否则hv=r-√r^2-(L/2)^2<h;在基准参数条件下,车辆经过坑槽区域时,车辆振动为振幅衰减的简谐振动,加速度最大值为3.2m/s^2,加权加速度均方根值为0.95m/s^2,人体主观感受为“不舒适”,坑槽的存在明显降低了行车舒适性;坑槽深度、坑槽平面尺寸、车速、路面纵坡均对行车舒适性影响较大,在行车舒适性评价时不可忽略。
Pothole is one of the significant defects for asphalt concrete pavement,which affects driving comfort and safety,but there is not accurate and systematic method to evaluate the driving comfort in pothole area.Based on the analysis of the model for the pothole area,the contact state between the tire and the bottom of the pothole is analyzed,and the effective depth of the pothole is determined,on the basis of which the vehicle vibration model is established.Human acceleration time-history curve of the vehicle passing through the pothole is obtained,and the driving comfort is evaluated by using the weighted root mean square of acceleration as an index.The effects of pothole depth,pothole plane size,vehicle speed and road longitudinal gradient on driving comfort are studied,and the evaluation method of driving comfort is put forward.The results show that when the length of the pothole L≥2√2rh-h^2,the effective depth of pothole of hv=h,otherwise hv=r-r√2-(L/2)^2<h.Under the condition of benchmark parameters,when the vehicle pass through the pothole,the vehicle vibration is a simple harmonic vibration with amplitude attenuation,the maximum acceleration is 3.2m/s^2,the weight root mean square of acceleration is 0.95m/s^2,and the subjective feeling of human body is uncomfortable.The existence of potholes obviously reduces the driving comfort.Pothole depth,pothole plane size,vehicle speed and road longitudinal slope all have great influence on driving comfort,which could not be ignored in the evaluation of driving comfort.
作者
马岢言
万娟霞
MAKe-yan;WAN Juan-xia(Gansu Province Transportation Planning,Survey&Design Institute Co.Ltd.,Lanzhou 730030,China)
出处
《公路》
北大核心
2020年第11期347-353,共7页
Highway
基金
甘肃省自然科学基金项目,项目编号2017GS10541。
关键词
道路工程
沥青混凝土路面
坑槽
行车舒适性
有效深度
road engineering
asphalt concrete pavement
pothole
driving comfort
effective depth
