基于运行速度的隧道进出口线形安全性评价

Alignment safety evaluation at tunnel entrance and exit based on driving speed

为提高隧道进出口行车安全性,通过对隧道进出口车辆运行速度变化特征及线形过渡的分析,构建反映平纵组合特征的隧道进出口线形综合描述模型;以运行速度差为线形安全性评价指标,提出安全性评价标准;采用数理统计方法,建立线形过渡综合指标与运行速度差的关系模型。结果表明:隧道进出口运行速度差与隧道线形过渡技术指标及前一个断面运行速度均相关。建议在隧道进出口线形设计中,根据设计车速的不同,参考线形过渡技术指标建议值进行安全性评价。

In order to improve the driving safety at tunnel entrance and exit,through analyzing the characteristic of the driving speed variety and the alignment transition demand,the tunnel entrance and exit alignment description model which reflects the horizontal and vertical combination character was established.The driving speed differential was considered as the alignment safety evaluation index and the safety evaluation criterion was also put forward.The relation models of the alignment transition index at tunnel entrance and exit and driving speed differential were set up by using the mathematical modeling method.The results indicate that the driving speed differential at tunnel entrance and exit is related with the alignment transition index and the driving speed of the preceding section.Therefore,during the alignment design of tunnel entrance and exit,the safety evaluation must be consisdered according the recommended value of the alignment transition at different design speed.7 tabs,3 figs,10 refs.