| 基于能量平衡的跨海桥梁钢管桩局部冲深计算 |
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| 引用本文： | 郭健,汪涛,王金权,吴继熠.基于能量平衡的跨海桥梁钢管桩局部冲深计算[J].海洋工程,2020,38(6):96-106. |
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| 作者姓名： | 郭健 汪涛 王金权 吴继熠 |
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| 作者单位： | 浙江工业大学 桥梁工程研究所, 浙江 杭州 310032;宁波市杭州湾大桥发展有限公司, 浙江 宁波 315000 |
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| 基金项目： | 国家重点研发计划项目（2018YFC0809604）；国家自然科学基金项目（U1709207）；浙江省重点研发计划项目（2018YFC0809604） |
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| 摘 要： | 综合国内外现有研究成果，分析了桩周流场结构及局部冲刷坑的分布形态，通过三维数值模拟，验证了局部冲刷最大值点出现在桩前，且冲坑坡度近似等于泥沙水下休止角的结论。从国内外规范内局部冲深计算公式中筛选出跨海桥梁钢管桩局部冲刷深度的主要影响因素。基于能量平衡理论，通过来流水流搬运冲刷坑内泥沙过程中的能量守恒，推导了概念清晰、形式简单的局部冲刷深度预测公式。区别于现有多数公式主体结构，该公式为关于局部冲深的一元三次方程，通过水下泥沙休止角来考虑泥沙对冲刷的影响以及冲刷过程中冲刷坑自身深度及范围变化对冲刷产生的影响。利用最小二乘法，结合环杭州湾区域三座跨海大桥的试验及实测数据拟合确定了公式相关参数，并与国内外规范内的公式对比验证，结果表明，该公式精度较高，可为实际工程计算分析提供参考。
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| 关 键 词： | 桥墩基础 局部冲刷 能量平衡 冲刷深度预测 水动力分析 |
| 收稿时间： | 2019/12/18 0:00:00 |
Calculation of local scour depth of steel pipe pile for sea-crossing bridge based on energy balance theory |
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| GUO Jian,WANG Tao,WANG Jinquan,WU Jiyi.Calculation of local scour depth of steel pipe pile for sea-crossing bridge based on energy balance theory[J].Ocean Engineering,2020,38(6):96-106. |
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| Authors: | GUO Jian WANG Tao WANG Jinquan WU Jiyi |
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| Institution: | College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310032, China;Ningbo Hangzhou Bay Bridge Development Co., Ltd., Ningbo 315000, China |
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| Abstract: | Based on the existing research results at home and abroad, the structure of the flow field around the pile and the distribution of local scour holes are analyzed. Through three-dimensional numerical simulation, the conclusion that the maximum point of local scour appears in front of the pile is verified, and the slope of scour hole is approximately equal to the angle of repose of sediment under water. The main factors influencing the local scour depth of steel pipe piles for sea-crossing bridges are selected from the local scour depth calculation formulas in the domestic and overseas codes. Different from the main structure of most existing formulas, the formula in this paper is a cubic equation of one variable for local scour depth. The influence of sediment on scouring is considered through the angle of repose of underwater sediment, and the influence of the change of depth and scope of scour pit on scouring is also considered. By using the least square method, the parameters of the formula are determined by fitting the experimental and on-site test data of three sea-crossing bridges in the area around Hangzhou Bay, and are compared with the formulas in codes. The results show that the formula has high accuracy, which can provide a reference for practical engineering. |
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| Keywords: | pier foundation local scour energy balance scouring depth prediction hydrodynamic analysis |
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