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为了给山区旅游公路的安全性设计提供科学的、可借鉴的设计方法和设计流程,文中以洪雅~峨眉山旅游公路新建工程为实例,使用先进的技术手段对该公路开展了行车安全性评估分析和设计优化,包括:进行多车型、多工况的运行速度计算,通过运行速度协调性分析给出了平面线形参数调整建议;根据三维线形条件下的大型车辆行驶速度曲线,评价了运行速度与设计速度之间的协调性,为爬坡车道设计提供了准确的布设位置;结合代表性车型的运行速度曲线、平纵面线形条件和隧道运行特点,确定了限速区段并给出了分车型的限速值;使用GSRS(Grade Severity Rating System)模型预测了大型车辆长下坡行驶时的制动器温度曲线,评估了避险车道选址的合理性;运用数值模式手段仿真车辆与护栏的碰撞过程,评估了路侧波型梁护栏的防撞性能并提出了护栏防护等级的选取建议。待公路建成通车之后,将对实际的运营效果和事故情况进行长期跟踪,以进一步修正和完善文中的研究方法。
In order to provide a scientific and reference design method and design flow for the safety design of the mountain tourist highway, this paper takes Hongya ~ Emei Mountain tourism highway as an example, using advanced technical means to carry out the traffic safety assessment of the highway And design optimization, including: calculating the running speed of multi-model and multi-working conditions, and providing the adjustment of plane linear parameters by analyzing the coordination of running speed; according to the running speed curve of large vehicles under three-dimensional linear conditions, The coordination between design speed and speed provides the exact layout for the design of climbing lane. Combining with the running speed curve of the representative model, the linear condition of the flat surface and the tunnel running characteristics, the speed limit section is determined and the points The model of GSRS (Grade Severity Rating System) was used to predict the brake temperature curve of large-scale vehicles when driving downhill, and the reasonableness of the selection of safe haven lanes was evaluated. The numerical simulation was used to simulate the collision between vehicle and guardrail Process to evaluate the crashworthiness of roadside wavy beam guardrail and propose the selection of guardrail protection grade. After the highway is completed and opened to traffic, the actual operational effects and accident situations will be tracked for a long time to further amend and perfect the research methods in the article.