台阶式沉井等效墩宽计算方法探究
Research on a methodology for computing the equivalent width of a stepped caisson pier
闻云呈 1朱大伟 2王晓俊 1成泽霖 3张帆一 1夏明嫣1
作者信息
- 1. 南京水利科学研究院,江苏 南京 210024
- 2. 江苏省水利勘测设计研究院有限公司,江苏 扬州 225009
- 3. 南京水利科学研究院,江苏 南京 210024;海岸灾害及防护教育部重点实验室(河海大学),江苏 南京 210098
- 折叠
摘要
桥梁工程中存在形状各异的桥墩,在研究不同截面桥墩的局部冲刷特性时,桥墩尺寸的定量描述非常重要.以台阶式沉井结构为研究对象,梳理并分析了国内外相关等效桥墩宽度计算方法,发现各类公式本质上为计算不同条件下的桥墩平均阻水宽度.开展了台阶式沉井局部冲刷试验研究,基于试验数据对比分析了各类等效墩宽计算方法的计算结果,发现Melville和Raudkivi的等效墩宽计算公式能够较好地估算考虑动床条件下台阶式沉井的平均阻水宽度;进一步收集了国内外193组台阶式沉井类结构的局部冲刷试验数据,数据集统计分析结果显示Melville和Randkivi的等效墩宽计算公式能够较为准确且保守地量化大多数台阶式沉井类结构的截面非均匀性;最后基于数据集冲深墩宽比统计结果对该公式近似方法的合理性进行了讨论.
Abstract
In the field of bridge engineering,piers come in various shapes,and accurately quantifying the width of piers with different shapes is crucial for studying local scour characteristics.This study focuses on investigating the effective width calculation methods for stepped caisson piers,by collecting and analyzing existing domestic and international approaches.The analysis reveals that these formulas essentially determine the average water-blocking width of bridge piers under different conditions.Experimental studies on local scour of stepped caisson piers were conducted,and the experimental results were used to compare and analyze different methods for calculating the effective pier width.The findings indicate that the approximate formula proposed by Melville and Raudkivi can effectively estimate the average water-blocking width of stepped caisson piers under live bed conditions.Additionally,a comprehensive dataset comprising 193 sets of experimental data on local scour of compound piers was gathered.Statistical analysis of the data demonstrates that the formula can accurately and conservatively quantify the non-uniformity of the majority of compound piers.Finally,the rationality of the approximate method employed in this formula was discussed based on the statistical results of the scour depth-to-pier width ratio within the dataset.
关键词
局部冲刷/等效墩宽/流量守恒原理/非均匀桥墩/水槽试验Key words
local scour/equivalent pier width/discharge conservation law/non-uniform pier/flume experiment引用本文复制引用
基金项目
海岸灾害及防护教育部重点实验室(河海大学)开放基金资助项目(202203)
江苏水利科技项目(2020002)
江苏水利科技项目(2021004)
出版年
2024
NETL
NSTL
维普
万方数据