| 高速公路长大下坡路段安全设计与评价方法 |
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| 引用本文： | 杨宏志, 胡庆谊, 许金良. 高速公路长大下坡路段安全设计与评价方法[J]. 交通运输工程学报, 2010, 10(3): 10-16. doi: 10.19818/j.cnki.1671-1637.2010.03.002 |
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| 作者姓名： | 杨宏志 胡庆谊 许金良 |
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| 作者单位： | 1.长安大学 特殊地区公路工程教育部重点实验室, 陕西 西安 710064;;2.宁海县规划设计院, 浙江 宁海 315600 |
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| 基金项目： | 青海省交通科技项目2005R03 陕西省交通科技项目08-08R 陕西省交通科技项目06-31K |
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| 摘 要： | 统计了长大下坡路段交通事故的时空分布与车型分布, 分析了试验路段道路条件与交通事故成因。采用断面观测法测定长大下坡路段小客车运行速度, 建立了小客车运行速度预测模型。采用DHS-130XL红外观测仪测量车辆制动毂温度, 建立了货车制动毂温度预测模型。对长大下坡定义进行了界定, 确定了长大下坡路段合理平均纵坡指标值及对应坡长值, 提出了长大下坡安全设计与评价程序。分析结果表明: 在长大下坡路段, 小客车与货车交通事故的主要原因分别是超速及刹车失灵; 对小客车可采用运行速度作为安全评价指标, 而对货车可采用坡长与制动毂温度; 建议安全坡长、一般安全坡长、极限最大坡长对应的制动毂温度分别为200℃、220℃、260℃; 采取安全改善措施后, 试验路段交通事故减少42.3%, 伤亡事故减少76.2%, 改善措施有效。
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| 关 键 词： | 道路工程 长大下坡 制动毂温度预测模型 运行速度预测模型 安全设计与评价 |
| 收稿时间： | 2010-02-02 |
Safety design and evaluation method of long-steep downgrade sections for expressway |
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| YANG Hong-zhi, HU Qing-yi, XU Jin-liang. Safety design and evaluation method of long-steep downgrade sections for expressway[J]. Journal of Traffic and Transportation Engineering, 2010, 10(3): 10-16. doi: 10.19818/j.cnki.1671-1637.2010.03.002 |
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| Authors: | YANG Hong-zhi HU Qing-yi XU Jin-liang |
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| Affiliation: | 1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China;;2. Ninghai Planning and Design Institute, Ninghai 315600, Zhejiang, China |
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| Abstract: | The spatial and temporal distribution of traffic accidents and the distribution of vehicle types were counted for long-steep downgrade sections of expressway.The conditions of tested road sections and the causes of traffic accidents were analyzed.The running speeds of cars on expressway were surveyed by section observation method, and their running speed prediction model was formulated.The temperatures of brake drums for trucks were measured by DHS-130XL infrared observing instrument, and their temperature predict model was set up.The definition of long-steep downgrade was proposed.The indices of average longitudinal slope were determined, and the reasonable average longitudinal slope lengths of long-steep downgrade sections were determined.The safety design and evaluation method of long-steep downgrade were put forward.Analysis result shows that for long-steep downgrade sections, the main reasons of traffic accidents are overspeed and brake failure, the running speed can be used as the safety evaluation index for cars, while slope length and the temperature of brake drum for trucks.The temperatures of brake drum for security slope length, general safety slope length and maximum limit slope length are 200 ℃, 220 ℃ and 260 ℃ respectively.The amount of traffic accidents reduces by 42.3% and casualties reduces by 76.2% after setting some safe improvement measures at the sections, so the measures are effective. |
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| Keywords: | road engineering long-steep downgrade temperature predict model of brake drum running speed predict model safety design and evaluation |
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