\r张芝永¹，肖厅厅²，戚 蓝²，陈 刚¹，曾 剑\r¹\r
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AuthorsHTML:\r张芝永¹，肖厅厅²，戚 蓝²，陈 刚¹，曾 剑\r¹\r
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AuthorsListE:\rZhang Zhiyong¹，Xiao Tingting²，Qi Lan²，Chen Gang¹，Zeng Jian\r¹\r
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AuthorsHTMLE:\rZhang Zhiyong¹，Xiao Tingting²，Qi Lan²，Chen Gang¹，Zeng Jian\r¹\r
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Unit:\r1. 浙江省水利河口研究院浙江省河口海岸重点实验室，杭州 310020；
2. 天津大学水利工程仿真与安全国家重点实验室，天津 300354\r
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Unit_EngLish:\r1. Key Laboratory of Estuary and Coast of Zhejiang Province，Zhejiang Institute of Hydraulics and Estuary，Hangzhou 310020，China；
2. State Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300354，China\r
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Abstract_Chinese:\r\r涌潮水流是一种蕴含较大能量的强非线性间断流\r．\r针对我国钱塘江河口地区范围内桥墩等桩式建筑物在涌潮水流作用下长期遭受的猛烈冲击问题，采用物理模型试验对桩柱在潮前水深上下两部分表面压强时程变化及涌潮潮头最大冲击压强出现位置进行了探讨并拟合得到最大冲击压强计算公式；采用数值模拟手段进行分离式建模，对桩柱在潮前水深上下两部分受力进行提取分析并拟合得到涌潮作用力计算公式．研究结果表明，涌潮水流与桩柱相互作用过程可分为\r3\r个阶段\r：\r在瞬时冲击期内，潮前水深以上桩柱部分在潮头猛烈冲击作用下，桩柱表面压强及受到的作用力瞬间增大至极大值，潮前水深以下部分表面压强和受到的作用力增长缓慢；衰减振荡期内，桩柱在潮前水深以上部分表面压强和受到的作用力迅速下降，潮前水深以下部分压强波动不大，受到的作用力衰减速率明显小于潮前水深以上部分；绕流作用期内，桩柱在潮前水深上下两部分表面压强和受力波动逐渐减小．桩柱在涌潮作用下表面压强及受力大小与涌潮水流参数中的潮前水深\r\rh\r\r_\r0\r\r和落潮流速\r\rV\r\r_\r0\r\r呈负相关，与涌潮高度\r\rH\r\r呈正相关；涌潮作用下最大冲击压强出现在\r0.5H\r附近，拟合得到的最大冲击压强及作用力计算公式经验证后具有良好的精度，可为相关应用提供参考．\r\r
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Abstract_English:\r\rThe tidal bore is a kind of strong nonlinear discontinuous flow containing large energy\r．\rAiming at the long-term violent impact of pile-type buildings\r，\rsuch as bridge piers\r，\rin the Qiantang River estuary area of China under tidal bore\r，\rthe physical test model is used to test the time-history variation of the surface pressure of piles in the upper and lower parts of the tidal water depth and tidal velocity\r．\rThe position of the maximum impact pressure of the head is determined and fitted to obtain the formula for calculating the maximum impact pressure\r．\rThe numerical simulation is used to separate the models of the upper and lower parts of the pile before the tide\r．\rThe force is separately extracted\r，\ranalyzed\r，\rand fitted to obtain the formula for calculating the tidal force\r．\rResults show that the interaction process between the tidal bore and the pile can be divided into three stages\r．\rUnder the impact of the water depth before the tidal bore\r，\rthe surface pressure of the pile and the force received will increase instantaneously under the impact of the tide\r．\rIn terms of the maximum value\r，\rthe surface pressure and force affected by the water depth before the tide slowly increase\r．\rDuring the attenuated oscillation period\r，\rthe surface pressure and force received by the pile before the tide rapidly decrease\r．\rMoreover\r，\rthe pressure below the tide depth does not fluctuate\r．\rThe rate of force attenuation is significantly smaller than that of the pre-tidal water depth\r．\rDuring the flow period\r，\rthe surface pressure and stress fluctuations of the piles in the upper and lower parts of the tidal water depth gradually decrease\r．\rThe surface pressure and force under tidal action are negatively correlated with the pre-tidal water depth h₀ and falling tide velocity V₀ and positively correlated with the tidal height H\r．\rThe maximum impact pressure under tidal action occurs near 0.5H\r．\rThe maximum impact pressure and force calculation formula obtained after fitting have good accuracy and can provide a reference for related applications.\r\r
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Keyword_Chinese:涌潮；桩柱；表面压强；作用力；经验公式\r

Keywords_English:tidal bore；pile column；surface pressure；force；empirical formula\r


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