砂质河道桥墩局部冲刷计算经验公式改进和验证  

Improvement and Verification of Empirical Formula for Local Scour Depth of Piers in Sandy River

作　　者：陈羿名 李怡 渠庚[1,3] 栾华龙 尹大聪 CHEN Yi-ming;LI Yi;QU Geng;LUAN Hua-long;YIN Da-cong(River Research Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;River and Lake Protection and Construction Operation Safety Center,Changjiang Water Resources Commission,Wuhan430010,China;Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of the Changjiang River of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]长江科学院河流研究所,武汉430010 [2]长江水利委员会河湖保护与建设运行安全中心,武汉430010 [3]长江科学院水利部长江中下游河湖治理与防洪重点实验,武汉430010

出　　处：《长江科学院院报》2023年第2期14-18,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金长江水科学研究联合基金项目(U2240224);国家自然科学基金青年项目(42006156,52009008);长江科学院创新团队资助项目(CKSF2021530/HL)。

摘　　要：桥墩局部冲刷深度是桥梁设计的重要参数,但随着造桥技术的发展,桥墩局部冲刷计算的经验公式在计算尺寸较大的桥墩局部冲深时误差偏大。为解决此问题,在前人的研究基础上,根据统一量纲的原则建立了砂质河道桥墩局部冲刷深度经验公式,并考虑基台露出床面对冲刷的影响,对公式进行修正。将文中提出的公式与中美计算规范进行比较,结果表明:所提出的公式具有考虑因素较全面、量纲统一、适用于大型桥墩局部冲刷深度计算的优点;计算精度相比另外3种公式有较明显的提高,能更好地预测桥墩局部冲刷深度。研究成果可为桥墩布设、施工与防护等提供技术支撑。Local scour depth of bridge pier is an important parameter in bridge design. The empirical calculation formula of local scour depth for large-sized piers is prone to generate big errors. In view of this, we established an empirical formula of local scour depth of bridge pier in sandy river under the principle of unified dimension, and further modified the formula considering the influence of abutment exposed on bed surface on the scour. Comparison with Chinese and American calculation specifications verified that the formula proposed in this paper is of higher precision, uniform dimension and comprehensive consideration of factors. It is suitable for calculating local scour depth of large piers.

关 键 词：桥墩冲刷 冲刷机理 局部冲深 经验公式 公式改进 行近流速 

分 类 号：U442.3[建筑科学—桥梁与隧道工程]