工程力学 ›› 2019, Vol. 36 ›› Issue (11): 72-82.doi: 10.6052/j.issn.1000-4750.2018.08.0455

• 土木工程学科 • 上一篇    下一篇

基于波浪-多孔介质海床-结构物耦合模型的单桩基础波浪力分析

陈林雅, 郑东生, 王盼娣, 祝兵   

  1. 西南交通大学土木工程学院, 四川, 成都 610031
  • 收稿日期:2018-08-16 修回日期:2018-11-19 出版日期:2019-11-13 发布日期:2019-11-13
  • 通讯作者: 郑东生(1964-),男,澳大利亚人,教授,博士,博导,主要从事波浪-海床-结构物相互作用理论研究(E-mail:dsjeng@home.swjtu.edu.cn). E-mail:dsjeng@home.swjtu.edu.cn
  • 作者简介:陈林雅(1990-),女,河南人,博士生,主要从事桥梁基础流固土耦合动力学及长期服役安全控制研究(E-mail:chenlinya01@yeah.net);王盼娣(1994-),女,河南人,硕士生,主要从事桥梁结构动力学及桥梁风浪耦合动力学研究(E-mail:15736874161@163.com);祝兵(1965-),男,江苏人,教授,博士,博导,主要从事桥梁结构动力学及桥梁风浪耦合动力学研究(E-mail:zhubing126@126.com).
  • 基金资助:
    国家自然科学基金项目(41176073,51178397)

ANALYSIS OF WAVE FORCE ACTING ON THE MONOPILE BASED ON WAVE-POROUS SEABED-STRUCTURE COUPLED MODEL

CHEN Lin-ya, ZHENG Dong-sheng, WANG Pan-di, ZHU Bing   

  1. Department of Civil Engineering, Southwest Jiao Tong University, Chengdu, Sichuan 610031, China
  • Received:2018-08-16 Revised:2018-11-19 Online:2019-11-13 Published:2019-11-13

摘要: 为了研究波浪作用下多孔介质海床特性和结构物埋深及施工下放速度等因素对结构物所受波浪力的影响,采用修正RANS方程和Forchheimer饱和阻力模型控制流体流动,流体体积法(VOF)追踪自由液面,并采用κ-ε闭合方程进行求解,建立波浪-多孔介质海床-结构物相互作用研究的三维耦合数值分析模型。首先,进行数值模型的验证分析,包含多孔介质海床对波浪传播的衰减效应,波浪作用下结构物周围湍流流动以及海床多孔特性条件下WAVE FORCES结构物所受波浪力。然后,进行结构物所受水平波浪力影响因素的参数分析,主要包含波浪条件,多孔介质海床特性及结构物特性三个方面。结果表明:将多孔介质海床简化为刚性不可渗固体而忽视海床多孔特性,会低估结构物所受的波浪力数值;大波高长周期波浪作用下,深水结构物所受波浪力较大;海床孔隙率、颗粒直径、海床厚度显著影响结构物所受波浪力;同时,结构物直径、截面形式、埋置深度及其施工下放速度v等结构物特性对波浪力的影响同样显著。因此,工程实践中,应同时考虑波浪条件、多孔海床特性和结构物埋置深度及动态运动过程,合理计算结构物所受波浪力数值,以指导结构设计和施工。

关键词: 波浪-多孔介质海床-结构物相互作用, 波浪力, 孔隙率, 颗粒直径, 埋置深度, 施工下放

Abstract: To study the influence of the porous seabed, embedded depth and vertical downward velocity of the structure on the wave forces under wave action, the modified RANS equation with a κ-ε closure and Forchheimer saturation drag model are used to control porous flow, and fluid volume method (VOF) is used to track free surface. A three-dimensional coupled model of wave-porous seabed-structure is established. Firstly, reliability of the coupled model is validated, including wave attenuation reduced by porous seabed, turbulent flow around structure under wave action, and wave forces acting on the structure considering seabed porous characteristic. Then, parameters affecting the wave forces on the structure is analyzed, mainly including three aspects, which is wave conditions, porous seabed characteristics and structural properties. The numerical results show that, ignoring the porous characteristics of the seabed and simplifying it into rigid solids will underestimate the wave forces acting on the structure. Under larger height and longer periodic wave, wave forces action on structure in the deeper water is greater. Moreover, the wave forces acting on the structure are significantly affected by the porous characteristics of seabed, i.e., the porosity, particle size, the thickness. In addition, the influence of structural properties, such as diameter, cross section, embedded depth and vertical downward velocity on wave forces is also significant. Therefore, in engineering practice, wave conditions, porous seabed characteristics, embedded depth and dynamic movement of structure should be considered simultaneously to calculate the wave forces more accurately.

Key words: wave-porous seabed-structure interaction, wave forces, porosity, particle size, embedded depth, vertical downward movement of structure

中图分类号: 

  • P751
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