为了提高弯坡组合路段的交通安全水平,提出了基于货车交通安全的弯坡组合路段可靠性设计方法.先以现行公路工程结构可靠度设计统一标准为依据,对弯坡组合路段可靠度进行了定义,以货车转弯和下坡过程中制动器制动效能下降的临界安全温度、货车侧滑和侧翻失稳现象为约束条件,建立弯坡组合路段的功能函数,推导了其可靠性模型,提出了弯坡组合路段可靠性计算模型的求解方法.结合实际案例分析,示范了弯坡组合路段可靠性设计方法的应用,并验证了其合理性.研究结果表明:①货车在某些设计参数条件下的弯坡组合路段上行驶时,往往也会发生侧翻先于侧滑的现象;②现行的弯坡组合路段设计即使能满足现行有关规范和指南的验算要求,但不一定能满足可靠性设计的要求.提出的弯坡组合路段可靠性设计方法能够减少危险弯坡组合路段的出现,提高道路运营安全性.%In order to improve the traffic safety level of combination of vertical and horizontal curves,the reliability design method of combination of vertical and horizontal curves based on the traffic safety of trucks is put forward.Based on Unified Standard for Reliability Design of Highway Engineering Structures,the reliability of combination of vertical and horizontal curves was defined.Then,with the critical safety temperature of braking efficiency drop,sideslip and rollover of trucks as constraints during turning and downhill,the performance function of combination of vertical and horizontal curves was established.Model for calculating combination of vertical and horizontal curves'' reliability was deduced and method for solving the model was put forward.With case study,application of the combination of vertical and horizontal curves reliability design method was illustrated,and its reasonability was verified.The results show that(1)When trucks are driving on combination of vertical and horizontal curves with some design parameters,the phenomenon of rollover before sideslip also occurs;(2)even if the current design results satisfy requirement of the specification,they may not reach the requirement of reliability design method.The proposed reliability design method for combination of vertical and horizontal curves can effectively reduce the occurrence of dangerous combination of vertical and horizontal curves and improve the safety of road operation.
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