基于停车视距约束的高速公路弯道声屏障设置可行性研究

Feasibility study on setting noise barrier on curved expressway based on stopping sight distance constraint

为探究高速公路弯道声屏障设置的可行性,基于横净距探究视距最差情况下弯道声屏障对停车视距的影响。通过HintCAD构建高速公路不同曲线类型、设计速度、车道数、圆曲线半径组合而成的曲线平面图模型,生成每种组合下平面图的视距包络图,共获得180组不同组合情况下的平曲线最大横净距。引入回归分析方法得到高速公路弯道路段满足不同停车视距约束的最大横净距与圆曲线半径之间的关系模型。根据关系模型和高速公路曲线路段实际横净距,计算出曲线路段加入声屏障后满足停车视距约束的最小圆曲线半径阈值,可用于判断曲线路段设置声屏障的可行性。

In order to explore whether the curve sight distance of the expressway installing noise barriers can meet the stopping sight distance test,the influence of the curve noise barrier on stopping sight distance under the worst condition of sight distance is studied based on the lateral clear spacing.Firstly,the curve plane model composed of different curve types,design speed,number of lanes,and circular curve radius of the expressway was constructed by HintCAD.Then,the line-of-sight envelope diagram of the plane graph under each combination was generated,and the maximum lateral clear spacing values of the plane graph under 180 different combinations were obtained.Finally,the regression analysis method was introduced to obtain the power function relationship model between the maximum lateral clear spacing and the radius of the circular curve.The maximum lateral clear spacing satisfied the different stopping sight distance constraints of the expressway.According to the lateral clear spacing value of the expressway curve section,the minimum circular curve radius threshold that satisfied the stopping sight distance constraint after adding the noise barrier to the curve section was calculated.It can be seen from the obtained threshold that when the design speed is 120 km/h and 100 km/h respectively,and the radius of the circular curve of the curve is less than the general minimum radius of the circular curve adopted under normal conditions,the setting of the noise barrier causes the sight distance to not meet the required stopping sight distance;When the design speed is 80 km/h and the radius of the circular curve is less than the limit minimum radius of the circular curve with a superelevation of 4%,the installation of the sound barrier will lead to the risk of insufficient parking sight distance.According to the obtained minimum circular curve radius threshold,the feasibility of setting the curve noise barrier on the curve section is judged.If it is not feasible,corresponding improvement measures can be taken to improve the sight distance.