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水流作用产生的局部冲刷对桥墩自身安全、河岸稳定有重要影响.在桥墩局部冲刷和近岸岸坡相对不稳定性的共同作用下,近岸桥墩附近河床变形趋势更具复杂性,对河岸稳定影响更加直接.以马鞍山长江大桥左汊近岸桥墩为研究对象,分别建立桥址断面概化模型和岸坡概化模型,通过不同流量条件下水槽模型试验,研究近岸桥墩附近水流形态、最大冲刷深度、最大冲刷坑形态以及岸线变化的情况,分析近岸桥墩引起的绕流顶冲、水面涌波、局部冲刷、冲刷不对称对河岸稳定的影响,从利于河岸稳定角度提出近岸桥墩布置一般原则,为近岸桥墩选址、桥墩选型和岸坡防护设计提供参考.
The local scour caused by water flow has an important influence on the pier safety and the bank stability.During the combined action of pier scouring and the relative instability of the coastal bank, the deformation trend of the riverbed near the abutment piers is more complicated and the stability of the bank The impact is more direct.With the bridge pier of the left bank of Maanshan Changjiang River Bridge as the research object, the generalized model of bridge section and the generalized bank slope model are established, and the model of flume under different flow conditions is used to study the water flow form near the bridge piers, Scouring depth, the shape of the largest scouring pit and the change of coastline, the influence of the top-piercing, surface surge, local scour and scour asymmetry on the bank stability caused by the abutment piers is analyzed. Based on the benefit of the bank stability, The general principle is to provide a reference for the site selection of abutment piers, the selection of piers and the design of bank protection.