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考虑高速公路隧道(群)各风险特征点的行车风险变化规律,对隧道(群)进行空间区段的划分,提出6个典型风险特征点;根据行车制动风险模型,分析隧道路段风险影响要素,如车辆初始速度、驾驶员反应时间、路面摩擦因数及道路纵坡坡度,给出了不同长度类型隧道(群)、不同时间、不同路面型式及灾害性天气下4个风险影响要素的取值;通过分析和对比理论计算结果,得到了隧道(群)各风险特征点在自由行驶状态和跟驰状况下的临界安全车速变化规律,进而得出各点的临界安全车速。结果表明:提出的隧道(群)风险特征点处的临界安全车速,能够为隧道运营安全管理提供理论依据。
Considering the changing rules of driving risk for each risk feature point of expressway tunnel (group), six typical risk characteristic points are proposed for the space segment of tunnel (group). According to the service braking risk model, the risk factors of tunnel section , Such as the initial vehicle speed, driver reaction time, friction coefficient of the road surface and longitudinal gradient of the road, four risk factors of different length types of tunnels (groups), different time, different road surface types and disastrous weather are given Through the analysis and comparison of the theoretical results, the critical safety speed variation of each risk feature point of tunnel (group) under free running condition and following condition is obtained, and then the critical safety speed of each point is obtained. The results show that the proposed critical traffic speed at the tunnel (group) risk feature point can provide a theoretical basis for the tunnel operation safety management.