基于视域分析的高速施工交通组织安全性评估

为提升施工期间高速公路通行的安全性与畅通性,首先利用空间句法中的视域分析法,研究构建针对施工交通组织方案的安全性评估模型;其次从宏观上提出整体视域安全性指标,定量化比选同一区域不同交通组织方案,通过视域安全性得分实现不同区域交通组织方案实施效果的纵向比较;然后从微观上构建关键节点评估模型,评估单个交通安全设施的视域安全性;最后以宁连高速、宁洛高速(南京段)施工组织方案为例,开展案例分析,并通过施工前、施工期交通情况对比评估施工组织方案的效用性。研究表明:安全性评价模型既可宏观评估交通组织方案的视域安全性,又可微观评估关键设施的可视性,从而减少高速公路施工对路段车辆运行的干扰。

Safety evaluation of traffic organization during highway construction based on visibility graph analysis

In order to improve safety and accessibility of highway traffic during construction,a safety evaluation model for traffic organization scheme was studied and developed based on visibility graph analysis of space syntax.Then,on the macro level,safety indexes of overall visibility were introduced to quantitatively compare different traffic organization schemes for same area,and a longitudinal comparison of implementation effects of schemes in different areas was also made by using visibility score.On the micro level,an evaluation method on key nodes was established to evaluate visibility safety of single traffic facility.Finally,two actual construction organization schemes,Nanjing Ninglian expressway and Ningluo expressway,were analyzed,and their effectiveness was evaluated by comparing traffic conditions before and during construction.The results show that the evaluation model can assess both the scheme’s visibility safety from macro perspective and visibility of key facilities from micro view,therefore reducing disturbance of highway construction on traffic.