Journal of South China University of Technology(Natural Science) >

2019 , Vol. 47 >Issue 10: 139 - 150

DOI: https://doi.org/10.12141/j.issn.1000-565X.190077

Traffic & Transportation Engineering

Safety Design Method of Long Slope Downhill Slope Based on Temperature Increase of Brake Drum

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  • 1． Highway Institute，Chang'an University，Xi'an 710064，Shaanxi，China;  2． Transportation Infrastructure Construction and Management of Digital Engineering Research Center of Shaanxi Province，Xi'an 710064，Shaanxi，China
张驰( 1981-) ，男，副教授，博士，主要从事交通安全与交通 BIM 研究．

Received date: 2019-03-01

  Revised date: 2019-05-15

  Online published: 2019-09-01

Supported by

Supported by the National Key R ＆ D Project( 2017YFC0803906) ， the Postdoctoral Fund of Ministry of Education of China( 2016M590915) and the Shaanxi Natural Science Basic Research Project( S2017-ZRJJ-MS0603) 

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Abstract

A safety combined design method of longitudinal slope based on the temperature rise of truck brake drum was studied in order to improve the driving safety level of continuous downhill driving on expressway and to alleviate the contradiction between road and vehicle in China． Six-axis semitrailer were taken as the leading truck，and the brake heating model was constructed by theoretical analysis method． The accuracy of the model was verified by the real vehicle test． The downhill distance when the brake drum temperature reaches 200 ℃，the temperature of the slope bottom and the temperature rise rate were selected as the analysis indexes to analyze the combined design method of the longitudinal slope，based on the analysis of the correlation between the accident rate of truck and the temperature rise of the brake drum． The results show that，considering the temperature rise of brake heating，the continuous downhill should be designed and optimized safely from three aspects: transition slope setting，difference control of adjacent slope segments and slope length combination，supplemented by protective measures and traffic management measures． Reasonable transition slope setting is beneficial to relieve the temperature rise of brake heating，but the cooling effect of transition slope is limited． The infinite reduction of slope not only can't help to reduce the temperature of brake heating，but also increases the length of the route． It is advisable to control the slope value reasonably according to the critical slope index． The slope difference of adjacent slope section should not be too large，designing longitudinal alignment as far as possible with the small slope difference of the longitudinal slope combination． It is advisable to control the slope difference according to the average longitudinal slope and the maximum slope difference regression equation． And the slope length combination form of long gentle slope and short steep slope should be adopted． Thus can to the greatest degree minimizes the continuous downhill of the lorry brake hub over 200℃， improving the safety of the lorry downhill． 

Key words：  road engineering; vertical combination design method; brake heating; long and steep downhill; combination of steep slopes and transitional slopes 

Cite this article

ZHANG Chi HOU Yudi QIN Jihan ZHANG Hong . Safety Design Method of Long Slope Downhill Slope Based on Temperature Increase of Brake Drum[J]. Journal of South China University of Technology(Natural Science), 2019 , 47(10) : 139 -150 . DOI: 10.12141/j.issn.1000-565X.190077

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