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研究包西铁路大桥冲刷规律及其防护措施,对于减少灾害,保护大桥安全意义重大。基于延河庙沟堤防工程的动床河工模型试验,观测了不同流量工况下包西铁路大桥的群桩基础局部冲刷情况,着重分析了局部冲刷成因。在此基础上,简化群桩基础模型,提出以四面六边透水框架群作为防护措施,并采用Fluent软件进行三维数值模拟,对比分析了有无防护措施两种情况下的流速分布特征。结果表明,四面六边透水框架群可大幅降低群桩基础前部及两侧行进流速,可达到减速落淤效果,该防护措施可行。
Researching on the rules of BaoZi railway bridge scouring and its protective measures are of great significance to disaster reduction and the protection of the safety of the bridge. Based on the dynamic bed model test of Yanhemiaogou dikes project, the local scour of the pile foundation of Baoxi Railway Bridge under different flow conditions was observed, and the cause of local scour was emphatically analyzed. Based on this, the basic model of pile group is simplified. The four-sided and six-sided water-permeable frame group is taken as the protective measure. The three-dimensional numerical simulation is carried out by using Fluent software. The flow velocity distribution characteristics are analyzed in two cases with or without protective measures. The results show that the four sides and six sides permeable frame group can significantly reduce the flow velocity at the front and both sides of the pile group foundation, which can achieve the effect of decelerating siltation. This protective measure is feasible.