[1]齐洪亮,张雪,潘玲玲.环形双石笼防护斜交布设桥墩局部冲刷效果及机理[J].长安大学学报(自然科学版),2025,45(6):107-123.
　QI Hong-liang,ZHANG Xue,PAN Ling-ling.Effect and mechanism of local scour around piers in tandem with skew angle protected by double circular gabions[J].Journal of Chang’an University (Natural Science Edition),2025,45(6):107-123.
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环形双石笼防护斜交布设桥墩局部冲刷效果及机理()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年6期
页码:
107-123
栏目:
桥梁智能运维与防灾减灾
出版日期:
2025-11-30

文章信息/Info

Title:
Effect and mechanism of local scour around piers in tandem with skew angle protected by double circular gabions
文章编号:
1671-8879(2025)06-0107-17
作者:
齐洪亮1; 2; 3; 张雪4; 潘玲玲5
(1. 长安大学 公路学院,陕西 西安 710064; 2. 长安大学 特殊地区公路工程教育部重点实验室,陕西 西安 710064; 3. 长安大学 西安市绿色智慧交通岩土工程重点实验室,陕西 西安 710064; 4. 山东省济南市历城区港沟街道办事处,山东 济南 250102; 5. 陕西智佳建筑科技有限公司,陕西 西安 710068)
Author(s):
QI Hong-liang1; 2; 3;  ZHANG Xue4;  PAN Ling-ling5
关键词:
桥梁工程;  斜交多桥墩;  环形双石笼;  局部冲刷;  模型试验;  数值模拟
Keywords:
bridge engineering;  skewed multi-piers;  double circular gabions;  local scour;  model test;  numerical simulation
分类号:
U447
文献标志码:
A
摘要:
针对与水流方向斜交布设多桥墩(单幅双墩和双幅四墩)的局部冲刷防护问题,研究了采用环形双石笼对上游桥墩进行防护时,下游各桥墩的局部冲刷特征,通过室内模型试验研究了清水条件下斜交多桥墩附近的局部冲刷特征,通过数值方法模拟了部分试验工况,分析了斜交多桥墩附近流场、压力及剪切应力等特征。研究结果表明:当桥墩组轴线与水流存在夹角时,上游桥墩防护措施对下游桥墩的局部冲刷有一定的防护作用; 对于单幅双墩的布设形式,夹角为0时对下游桥墩的防护效果最佳,与上游桥墩无防护时相比,其减冲率可达约58%; 随着角度的增大,其防护效果逐渐减弱; 当夹角大于15°时,其减冲率小于10%,此时必须对下游桥墩进行防护; 对于双幅四墩的布设形式,上游桥墩的防护措施对下游桥墩的防护效果特征与单幅双墩布设时一致; 当夹角大于15°时,须对下游第2、4根桥墩进行防护,当上游桥墩采用环形双石笼防护时,石笼的透水性使得其内部水流沿等压线流出,可显著削弱石笼周围的水流流速,进而起到防护的作用; 同时,上游桥墩后方低速区范围显著增大,下游桥墩两侧的绕流流速大大降低,可有效减弱下游桥墩的局部冲刷; 随着桥墩轴线与水流夹角的增大,下游桥墩逐渐远离上游桥墩的遮蔽范围,上下游桥墩对绕流漩涡的干扰相互叠加,夹角越大叠加作用越显著,从而导致下游桥墩的局部冲刷深度显著增大。研究成果可为斜交多桥墩局部冲刷防护提供参考。
Abstract:
Aiming at the challenge of local scour protection in multi-pier configuration(single-deck double-pier and double-deck four-pier)skewed to the water flow direction, the local scour characteristics around downstream piers were investigated when using double circular gabions to protect the upstream pier. Laboratory model tests were conducted to study the local scour characteristics around skewed multi-piers under clear-water conditions. Numerical simulations were performed for selected test conditions to analyze the flow field, pressure and shear stress distributions around the skewed multi-piers. The research results indicate that when there is an angle between the pier group axis and the water flow direction, the protection measures applied to the upstream pier provide a certain degree of protection to downstream piers. For the single-deck double-pier arrangement, the optimal protective effect on downstream piers achieves at an angle of 0. Compared with the case without upstream pier protection, the scour reduction rate is approximately 58%. As the angle increases, the protective effect gradually diminishes. When the angle exceeds 15°, the scour reduction rate falls below 10%, necessitating protection for downstream piers. For the double-deck four-pier arrangement, the protection measures for the upstream pier have the same protective effect characteristics on downstream piers in the single-deck double-pier arrangement. When the angle exceeds 15°, protection is required for the second and fourth downstream piers. When the double circular gabions are used to protect the upstream pier, the permeability of gabions enables water inside to flow out along the equipotential lines, significantly reducing the water flow velocity around the gabions and thereby providing protection. Simultaneously, the area of low-velocity zone behind the upstream pier increases substantially, and the flow velocity around sides of downstream piers greatly reduces, effectively mitigating the local scour to downstream piers. As the angle between the pier axis and the water flow direction increases, the downstream piers gradually move out of the sheltered range of the upstream pier. The interferences of upstream and downstream piers with the vortex flow superimpose, and this superposition effect becomes more pronounced with larger angles, leading to a significant increase in the local scour depth to downstream piers. The research findings can provide a reference for the local scour protection of skewed multi-piers.2 tabs, 18 figs, 30 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-05-11
基金项目:中央高校基本科研业务费专项资金项目(300102213208); 国家自然科学基金项目(51708043); 陕西省自然科学基础研究计划项目(2019JQ-680)
作者简介:齐洪亮(1982-),男,陕西宝鸡人,副教授,工学博士,E-mail:qihongl@chd.edu.cn。
更新日期/Last Update: 2025-12-20