冬奥延庆赛区复杂山地公路路面附着系数研究

Research on Adhesion Coefficient of Complex Mountainous Road in Yanqing District of Winter Olympics

由于地形的限制,冬奥延庆赛区的山地公路设计中大纵坡小半径路段较多,境内现有的标准、规范未能全面覆盖,为保障运行安全,需进行路面附着系数的研究。根据实际运营状况,利用摆式仪测量路面常温干燥、低温干燥、低温潮湿、融雪等状态下,普通轮胎、雪地轮胎分别与普通路面、防滑路面组合的附着系数值。研究发现,在所有路面上,普通轮胎的附着系数随温度的升高先减小后增大、而雪地胎的值持续增大至稳定;两种轮胎的值随水膜厚度的增加先减小后增大,雪地胎的值始终高于普通轮胎。最优组合为刻槽路面和雪地胎,低温干燥的值为0.806,低温潮湿的值为0.75,雪水混合物状态下的值为0.436。文章可为理论计算和仿真安全评价提供关键参数支持。

Due to the limitation of terrain,the roads in mountainous areas of the Winter Olympics are designed with large longitudinal slopes and small radius sections.The existing relevant standards and specifications in China cannot cover all these conditions.In order to ensure the road safety,it is necessary to carry out studies of the road adhesion coefficient.According to the actual operation conditions,the pendulum instrument is used to measure the adhesion coefficient of the ordinary tire and the snow tire combined with the ordinary road surface and the non-slip road surface under the conditions of normal temperature drying,low temperature drying,low temperature humidity,and snow melting.It is found that on all road surfaces,the adhesion coefficient of ordinary tires decreases first and then increases with the increase of temperature,while the value of snow tires continues to increase to stability.The values of the two tires decrease first and then increases with the increase of water film thickness,and the value of the snow tire is always higher than the ordinary tire.The optimum combination is grooved road surface and snow tire,whose value of low temperature drying is 0.806,the value of low temperature humidity is0.75,and the value of snow water mixture is 0.436.The key parameter support for theoretical calculations and simulation safety evaluation is provided.