特大桥梁桥墩局部冲刷机制及防护措施研究

Research on Local Scour Mechanism and Protective Measure of Extra-large Bridge Pier

为了保证桥梁安全,文章以某高速公路跨河特大桥为研究对象,分析桥墩局部冲刷机制,基于修正式计算河床泥沙平均粒径、墩前行进流速对桥墩局部冲刷深度的影响,阐述抛石、护圈及桥墩开缝等防护措施在桥墩局部冲刷防护中的应用要点及效果,研究成果可为类似桥梁局部冲刷防护提供借鉴。

In order to ensure the safety of the bridge,this paper analyzes the local scour mechanism of the pier by taking an extra-large bridge across river of an expressway as the research object,calculates the influence of the average particle size of the riverbed sediment and the forward flow velocity in front of the pier on the local scour depth of the pier based on the correction formula,and expounds the application points and effects of protective measures such as riprap,protective ring and pier opening in the local scour protection of the pier.The research results can provide reference for the local scour protection of similar bridges.