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桥梁基础冲刷研究综述

向琪芪 李亚东 魏凯 王顺意 姚昌荣

向琪芪, 李亚东, 魏凯, 王顺意, 姚昌荣. 桥梁基础冲刷研究综述[J]. 西南交通大学学报, 2019, 54(2): 235-248. doi: 10.3969/j.issn.0258-2724.20170373
引用本文: 向琪芪, 李亚东, 魏凯, 王顺意, 姚昌荣. 桥梁基础冲刷研究综述[J]. 西南交通大学学报, 2019, 54(2): 235-248. doi: 10.3969/j.issn.0258-2724.20170373
XIANG Qiqi, LI Yadong, WEI Kai, WANG Shunyi, YAO Changrong. Review of Bridge Foundation Scour[J]. Journal of Southwest Jiaotong University, 2019, 54(2): 235-248. doi: 10.3969/j.issn.0258-2724.20170373
Citation: XIANG Qiqi, LI Yadong, WEI Kai, WANG Shunyi, YAO Changrong. Review of Bridge Foundation Scour[J]. Journal of Southwest Jiaotong University, 2019, 54(2): 235-248. doi: 10.3969/j.issn.0258-2724.20170373

桥梁基础冲刷研究综述

doi: 10.3969/j.issn.0258-2724.20170373
基金项目: 国家自然科学基金资助项目(51708455)
详细信息
    作者简介:

    向琪芪(1990—),男,博士研究生,研究方向为桥梁基础局部冲刷,E-mail:xiangqiqi1990@qq.com

    通讯作者:

    李亚东(1956—),男,教授,博士生导师,研究方向为现代桥式与桥梁设计理论等,E-mail:yadongli2009@qq.com

  • 中图分类号: CT447

Review of Bridge Foundation Scour

  • 摘要: 冲刷是导致桥梁结构破坏的关键因素之一,从机理、计算、模型、探测及防护、承载及变形等5个方面较为系统地对桥梁基础冲刷的研究和实践进行了综述. 首先,在总结现有桥梁基础冲刷机理的基础上,对比分析了已有冲刷计算公式,阐明不同公式的局限性;随后,通过综述桥梁基础冲刷在试验和数值方面的研究,指出模型试验及数值模拟方法存在的不足和问题;此外,讨论了桥梁基础冲刷探测方法及主要的冲刷防护措施,比较了各种探测方法的优缺点及各种防护措施的作用原理,概述了冲刷对桥墩承载及变形特性的影响;最后,指出了桥梁基础冲刷方面值得进一步研究的问题和发展方向.

     

  • 图 1  桥墩附近扰动流场及冲刷形态示意

    Figure 1.  Flow field and scour pattern around bridge pier

    图 2  沉井基础附近涡流区和脊的细节

    Figure 2.  Details of vortex zones and ridge for flow around bridge pier with caisson

    图 3  主动防护措施

    Figure 3.  Active countermeasures

    图 4  被动防护措施

    Figure 4.  Passive countermeasures

    表  1  中美桥梁基础冲刷计算公式的优缺点对比

    Table  1.   Advantages and disadvantages of calculation formulae of China and US

    计算公式优点缺点
    中国规范清水冲刷和动床冲刷采用不同的计算公式,两者区分更加明显;修正式65-1和式65-2选择两者估算值中
    最不利的一种;与现场实测数据结果的拟合较好.
    参数较多,且大部分参数的取值存在较大的不确定性;同一公式两边的量纲不一致,不同公式右侧的量纲也不相同,公式经验性极强;未考虑漂流物墩前聚集对桥墩局部冲刷的影响;复杂群桩桥墩冲刷的计算结果对设计和工程实际的参考价值有限.
    美国规范参数较少,简化,便于理解和应用;公式两边量纲一致,引入弗劳德数,使水力学方面的物理意义更明确;对于复杂群桩桥墩冲刷的叠加法,概念明确,实现了与简单桥墩冲刷的统一计算;能考虑漂浮物聚集对桥墩局部冲刷的影响.未涉及河床泥沙颗粒对局部冲刷深度的影响,仅仅通过系数考虑河床地貌的影响;计算结果偏于保守;与现场实测数据的拟合误差较大.
    下载: 导出CSV

    表  2  桥梁基础冲刷现有测量仪器对比

    Table  2.   Comparison of existing instruments for monitoring bridge foundation scour

    探测仪器优点缺点或局限性相对成本
    雷达持续探测操作耗时;需要专业培训
    声纳持续精确探测平缓的河流 (河口)
    声学多普勒电流分析仪便携能测量速度分布和水深不适用于泥沙浓度含量高的条件
    FBG传感器河床连续监测现场测试成功率有限
    编号的砖易于获得;适用于高度湍流和快速流动要求开挖河床;适用于临时河流
    SMC易于操作要求开挖河床;高维护和修理费用
    钢棒易于操作要求开挖河床;高维护和修理费用
    下载: 导出CSV

    表  3  两种不同原理的冲刷措施对比

    Table  3.   Comparison between two different scour countermeasures

    项目主动防护被动防护
    原理改变水流特性、破坏涡流,减少冲刷效应铺设保护层,保护下层免受冲刷
    工程措施护圈、挡板、桥墩开缝、墩前排桩等铺设防护层、抛石防护、扩大基础等
    优点可以为不同位置条件选择不同的设计以获得满意的结果最常用;使用方便;在多数情况下效果好
    缺点特定的条件下需要特殊设计;成本增加和新结构的建设难以保持保护层位置;引起额外的束缩冲刷
    下载: 导出CSV
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  • 收稿日期:  2017-05-09
  • 修回日期:  2018-04-25
  • 网络出版日期:  2018-10-10
  • 刊出日期:  2019-04-01

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