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基于车速的公路连续长坡路段纵断面安全性研究(论文).pdf

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第48卷 第4期 西安建筑科技大学学报(自然科学版) Vol.48 No.4 2016年8月 J.Xi'an Univ. of Arch.& Tech. (Natural Science Edition) Aug. 2016 收稿日期:2015-10-08 修改稿日期:2016-08-22 基金项目:国家自然科学基金青年科学基金(51308449); 陕西省教育厅专项科研计划项目(2013JK0955) 作者简介:张娟(1978),女,讲师,博士,主要研究方向:道路交通安全.Email:sayibing@126.com 诸I:10.15986/j.1006-7930.2016.04. 012 基于车速的公路连续长坡路段纵断面安全性研究 张 娟,朱文强, 陈 君, 马 兰 ( 西安建筑科技大学土木工程学院,陕西 西安,710055) 摘要:为研究公路连续长坡路段纵断面与运行车速之间的关系,选择9名驾驶人进行实际道路实车试验.用动态GPS采集 试验车辆的实时车速数据,分别得到上、下坡方向的85%车速,速度的表征参数选用速度增长率(车速的均值相对于85% 车速的增长率,用表示),依次研究公路连续长坡路段纵断面要素与速度增长率之间的关系.研究结果表明:驾驶人对下 坡方向坡度的敏感性较弱,坡度对车速的影响较小;速度增长率和缓坡坡长存在三次函数关系,但上坡方向的速度增长率 随缓坡坡长的增长而波动较大,下坡方向起伏相对平缓;速度增长率和陡坡坡长亦存在三次函数关系,上坡方向坡长在 400 m附近时,对安全行车较有利;下坡方向坡长在550 m附近时,对安全行车较有利;较利于公路连续长坡路段安全行 车的竖曲线半径取值范围为900~950 m. 关键词:公路连续长坡路段;坡度;坡长;竖曲线半径;速度增长率 中图分类号:U491 文献标志码: A 文章编号:1006-7930(2016)04-0529-06 Safety research of the longitudinal alignment of long and steep slope based on the velocity of vehicle ZHANG Juan, ZHU Wenqiang, CHEN Jun , MA Lan (School of Civil Engineering , Xi ′an University of Architecture and Technology , Xi ′an 710055,China ) Abstract: In order to research the relationship between longitudinal alignment with the operating velocity in accordance with uphill direction and downhill direction, nine drivers were selected randomly as pilots of the actual road experiment. GPS was used to collect the vehicle’s real time velocity. According to the cumulative frequency distribution curve of velocity, 85% velocity of uphill direc- tion and downhill direction could be calculated. The growth rate of all drivers’ 85% operating velocity relative to the 85% velocity was selected as the velocity parameters. The research results are as follows: With the downhill direction, driver’s sensitivity to slope was weak, the slope has little influence on velocity. Velocity growth rate and the length of gentle slope has three curve relation, Ve- locity growth rate has a great fluctuation with the growth of slope length with the uphill direction, and with the downhill direction,it has gentle fluctuation. Velocity growth rate and the length of steep slope also has a three curve relation.While 400 meters length of slope is more favorable for driving safety with uphill direction, 550 meters length of slope is more conducive to driving safety with downhill direction.Vertical curve radius in 900-950 meters is more beneficial to driving safety. Key words: long and steep slope; slope; slope length; longitudinal radius; speed increase rate 如今,公路连续长坡路段是指通常在线形设 计上易于导致车辆长时间空档滑行或刹车距离长 的陡坡路段,而对公路连续长坡路段的定义,国 内的公路相关标准规范只是模糊规定“连续3 km, 平均坡度不能大于5.5%”,在实际道路线形设计 中,很容易满足规范要求,但公路竣工后通车运 营过程中事故频发 [1-3] .诸多研究资料表明,公路 连续长坡路段相对于其他路段具有交通事故频发、 重大及恶性交通事故多等特点 [4-5] .这与连续长坡 路段的坡陡坡长、线形指标差等因素不无关 系.坡长、坡度和竖曲线是道路纵断面线形的重要组成,合理的坡长、坡度和竖曲线是确保车辆 平稳舒适运行、视距良好和行车安全等的重要保 障.相关文献从驾驶人心理生理、车辆制动温升 等角度针对下坡方向对公路纵坡及坡长进行了研 究分析 [6-12] .但是连续长坡路段因为长下坡和长上 坡问题的存在,在下坡方
基于车速的公路连续长坡路段纵断面安全性研究(论文).pdf
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