公路空间视距计算方法与检测技术

为了精确计算公路在三维空间中的实际视距,提出了空间视距的概念,通过延伸应用空间两点通视原理,建立了空间视距计算和分析的数学模型。基于计算机仿真技术开发出对空间视距的实时检测技术,通过将设计视距、运行视距和空间视距3种视距对比分析,给出了发现视距不足的方法。与早前的视距计算方法和研究相比,该方法对正常路面、行车道空间视距计算准确,能够计算和分析公路路侧附属设施对视距的影响,为公路几何设计和安全评价提供了依据。

Calculating method and appraising technique of highway 3D-view sight distance

In order to accurately calculate the actual sight distance in three-dimensional space,this paper puts forward the concept of 3D-view sight distance,sets up a mathematical model for calculation and analysis of 3D-view sight distance by applying and extending the intervisible principle between two dots.Based on computer virtual simulation technology,it develops real time checking technique for 3D-view sight distance,and puts forward a method of finding short of sight distance by contrasting three kinds of sight distance: design-vehicle sight distance,driving sight distance and 3D-view sight distance.Compared with former calculating methods and researches of sight distance,this method not only gives a way for accurately calculating 3D-view sight distance on normal pavement and carriageway,but also achieves the impact of roadside facilities on sight distance,provides a basis for highway geometric design and traffic safety evaluation. 5 figs,10 refs.