| 摘要: |
| 在我国近海海域，跨海桥梁基础冲刷是影响大桥安全的重要因素之一。本文首次基于金塘大桥2014、2015和2017年桥墩基础冲刷实测资料结合建桥前地形测验资料进行了案例分析，解析出了往复潮流条件下桥墩基础的一般冲刷及局部冲刷深度，金塘大桥中引桥桥墩一般冲刷深度约为3.3~3.6m，局部冲刷深度约8.3m。往复潮流条件下桥墩基础局部冲刷坑受双向潮流影响向上下游延伸，形状呈椭圆形，各墩冲刷坑纵向长度与最大局部冲刷深度呈近似线性关系，长度约为局部冲刷深度的10-12倍，而各墩冲刷坑横向宽度则基本一致，约为桥墩基础宽度的4~5倍，与最大局部冲刷深度无明显相关性。 |
| 关键词: 桥梁工程 基础冲刷 实测资料 往复潮流 一般冲刷 局部冲刷 |
| DOI： |
| 分类号:U442.32??????????????? |
| 基金项目:国家自然科学(51609214),浙江省科研院所研究开发专项(河口A20008),浙江省水利科技计划项目(RB1903, RC2020, RC1907) |
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| A Study of the Scour Features of Sea-crossing Bridge Piers based on Field Measurement Data |
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YANG Yuan-ping1, ZHANG Zhi-yong1, LI Zui-sen1, Zeng Jian1, Han Jia-nan2, CHEN Gang1
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1.Zhejiang Institute of Hydraulics and Estuary,Key laboratory of Estuary and Coast of Zhejiang Province,Hangzhou;2.School of harbor,coastal and offshore engineering,Hohai university,Nanjing
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| Abstract: |
| The local scour around bridge piers is one of the main factors that affect the safety of sea-crossing bridges in the nearshore areas. To obtain a deep understanding of the scour effects under bidirectional tidal flows, the scour features of bridge pier under tidal flow was systematically studied based on survey data from 6 bridge piers of Jintang Sea-crossing Bridge in Hangzhou Bay during 2014, 2015 and 2017. The general scour depth and maximum local scour depth were analyzed respectively. The general scour depths of piers are about 3.3 ~ 3.6m, and the average local scour depth is about 8.3m. The local scour holes extend both upstream and downstream and present as oval shape under bidirectional tidal flows. The length of scour hole is about 10~12 times of their corresponding maximum local scour depth while the scour hole widths of the six bridge piers are nearly the same. There is no obvious correlation between the width of scour hole and the maximum local scour depth. |
| Key words: bridge engineering bridge scour survey data bidirectional tidal flow general scour local scour |
