暴雨条件下高速公路超高缓和段积水深度分布模型构建

The Accumulated Water Depth Distribution Model of Superelevation Runoff of Highway under Rainstorm Conditions

暴雨条件下高速公路超高缓和段积水易造成行车安全问题。研究超高缓和段的积水深度分布情况,能为道路设计提供理论指导。通过引入流体力学中的圣维南方程和曼宁公式,提取道路几何模型并划分道路网格,利用有限元方法对道路网格单元间的径流传递特征和径流深度进行分析,构建暴雨条件下的超高缓和段积水深度分布模型,并对双向四车道高速公路的超高缓和段进行试验分析。结果表明,积水深度分布模型能够客观反应不同道路纵坡、超高横坡、降雨强度下的超高缓和段积水深度分布状况,研究结果为道路超高缓和段排水不良路段的线形优化设计提供借鉴与指导。

Under the rainstorm conditions,the ponding in the superelevation runoff of the highway is easy to cause traffic safety problems.The distribution of accumulated water depth in the superelevation runoff was studied to provide the theoretical guidance for road design.By introducing the Saint-Venant equation and the Manning formula in fluid mechanics,the road geometric model was extracted and the road grid was divided.The finite element method was used to analyze the runoff transfer characteristics and runoff depth between the road grid units,build the distribution model of water accumulation depth in superelevation runoff under rainstorm conditions,and conduct experimental analysis on superelevation runoff of two-way four-lane highway.The results show that the accumulated water depth distribution model can objectively reflect the distribution of ponding depth in the superelevation runoff under different road longitudinal slopes,superelevation cross slopes and rainfall intensities.The research results provide reference and guidance for the linear optimization design of road sections with poor drainage in superelevation runoff.