为提升高速公路连续下坡行车安全水平，缓解中国长下坡路段车路协同矛盾，研 究了基于货车制动毂温升的纵坡组合安全设计方法． 选取六轴铰接列车为主导车型，采用 理论分析法构建了制动毂温升模型，通过实车试验验证了模型准确性． 收集了试验路段多 年事故数据，基于对货车事故率与制动毂温升的相关性分析，选取温度达到 200 ℃时下坡 距离、坡底温度和温升速率作为纵坡组合安全性分析指标，对连续下坡纵坡组合设计方法 进行了分析． 结果表明:从制动毂温升层面考虑，连续下坡应从缓坡设置、坡度差控制和坡 长组合三方面进行安全设计与优化，并辅以主、被动防护和交通管控措施; 合理设置缓坡 有利于缓解制动毂温升，但缓坡降温效果有限，坡度无限趋缓既无益于降低制动毂温度， 也增加了路线长度，宜根据临界坡度指标合理控制缓坡取值; 相邻坡段坡度差不宜过大， 尽量以坡差较小的纵坡组合进行展线，宜根据平均纵坡以及最大坡度差回归方程控制坡 差;同时应采用长缓坡和短陡坡的坡长组合形式． 由此可最大限度避免连续下坡的货车制 动毂超过200℃，提升货车下坡安全． 

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．