基于BIM的高速公路有效视距影响因素分析

Analysis of Influence Factors of Avilable Sight Distance on Expressway Based on BIM

为减少高速公路事故的发生,针对高速公路有效视距影响因素进行了研究。研究基于BIM技术和可靠度理论,分别考虑公路线性组合、山体、边坡、中央分隔带、交通设施、植被等因素对有效视距带来的影响,利用BIM建立大量工况模型并确定有效视距,将所得有效视距和失效概率作为视距评估的主要依据。研究表明,上坡行驶的凸型纵坡路段及凸型平直路段、外侧车道行驶的右偏平曲线路段或右偏弯坡组合路段、内侧车道行驶的左偏弯坡组合路段、外侧车道行驶的右偏凹型弯坡组合路段是易出现视距失效的高危路段。应在公路设计时重点考量上述类型路段,避免出现严重的视距失效情况。

In order to reduce the expressway accidents, the effective sight distance of expressways was studied. Based on BIM and reliability throry, influences of road linear combination, mountain, slope, medial divider, traffic facilities and vegetation on available sight distance(ASD) are considered respectively. Many working condition model were established by BIM to determine ASD. The distance and failure probability are key basis of describing the sight distance assessment. The research results show that the dangerous sections of sight distance failure are on the convex longitudinal slope sections and convex flat sections in uphill driving, right inclined flat curve road section or curved slope combination section in outside lane driving, left inclined curved slope combination section in inside line driving, right inclined concave curved slope combination section in outside lane downhill driving. The road sections mentioned above should be considered in highway design to avoid serious sight distance failures.