三维波浪作用下钢吊箱围堰下放过程受力研究

黄博; 段伦良; 祝兵

doi:10.3969/j.issn.0258-2724.2018.03.013

三维波浪作用下钢吊箱围堰下放过程受力研究

doi: 10.3969/j.issn.0258-2724.2018.03.013

基金项目:

四川省应用基础研究重大前沿项目 2017JY0003

国家自然科学基金资助项目 51178397

详细信息

作者简介:
黄博(1992-), 男, 博士研究生, 研究方向为桥梁结构动力学及桥梁风浪耦合动力学, E-mail:bohuang-swjtu@my.swjtu.edu.cn

中图分类号: U445.556
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- 文章访问数: 462
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- 被引次数: 0
出版历程
- 收稿日期: 2016-09-28
- 刊出日期: 2018-06-25

Study of Three-Dimensional Wave Forces on Lowering of Steel-Suspending Cofferdam

摘要

摘要: 为了解跨海大桥桥台施工过程中哑铃型钢吊箱围堰与波浪的相互作用，研究了围堰下放过程中所受的波浪力.基于RANS方程和k-ε湍流方程建立了波浪-围堰相互作用三维数值模型，并采用流体体积法捕捉自由液面.该模型不但考虑了钢护筒对围堰周围波浪场影响，而且考虑了围堰的整个动态下放过程.结果表明：钢护筒的存在以及围堰动态下放过程均会对围堰周围波浪场产生显著影响，考虑钢吊箱围堰动态下放过程时的受力较固定淹没深度处围堰的受力增大10%；随着波浪高度和波浪周期增大，钢吊箱围堰在下放过程中所受最大水平力呈现增大趋势.
- 波浪作用 /
- 围堰 /
- 三维模型 /
- 数值模拟
Abstract: In order to understand the interaction between dumbbell shaped steel boxed cofferdam and wave during the construction of the bridge across the sea. The interaction between a steel-suspending cofferdam and wavesis studied, to investigate the influence of waves on the construction progress of the large dumbbell cofferdam. A numerical model for wave-cofferdam interactions is established, in which the Reynolds-averaged Navier-Stokes equations and k-ε model are used to generate waves, while the VOF(volume of fluid) method is used to trace the water surfaces. The influence of the steel tube and the lowering of the cofferdam on the wave field around the cofferdam are considered. The numerical simulation results show that the steel tube and lowering of the cofferdam have significant effects on the wave field around the cofferdam. Consideration of the lowering of the steel-suspending-cofferdam, the wave forces on the cofferdam will be 10% larger than that on the cofferdam with a certain submerged depth. With increments of the wave height and wave period, the wave forces acting on the lowering steel-suspending cofferdam tend to increase.
- wave effect /
- cofferdams /
- three-dimensional models /
- numerical simulation

HTML全文

图 1 围堰几何尺寸(单位:m)

Figure 1. Dimensions of the cofferdam (unit: m)

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图 2 波浪-围堰相互作用

Figure 2. Sketch of wave-cofferdam interactions

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图 3 30 s时波面图

Figure 3. Water surface at 30 s during wave transportation

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图 4 不同网格尺寸比例对应的最大水平波浪力

Figure 4. Variations of horizontal wave force versus different meshsizes

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图 5 数值模型y-z平面的网格划分

Figure 5. Sketch of mesh generation for the y-z plane of the numerical model

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图 6 围堰周围波浪压力场随时间变化

Figure 6. Variations of the wave pressure around the cofferdam over time

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图 7 围堰周围流速矢量分布

Figure 7. Distributions of velocity around the cofferdam

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图 8 不同工况下钢吊箱围堰所受波浪力的变化

Figure 8. Variations of wave forces on the steel-suspending-cofferdam under different conditions

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图 9 围堰所受最大水平力随波高变化

Figure 9. Variations of maximum horizontal wave force on cofferdam versus wave heights

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图 10 围堰所受最大水平力随周期的变

Figure 10. Variations of maximum horizontal wave force on cofferdam versus wave periods

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表 1 数值计算结果与实验结果的比较

Table 1. Comparison between numerical results and experimental data

kN
波浪力		频率/s^-1, 波高/cm
波浪力		4.33, 15.87	4.83, 16.20	5.24, 15.89	5.71, 10.19	6.28, 6.25	6.98, 3.98
F_x=ρgA₁a²	实验值	4.54	4.58	5.12	5.54	5.22	5.19
F_x=ρgA₁a²	计算值	4.68	4.49	5.23	5.77	5.41	5.02
F_y=ρgA₁a²	实验值	1.26	0.99	0.85	0.74	0.77	0.71
F_y=ρgA₁a²	计算值	1.29	1.05	0.84	0.69	0.79	0.70

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参考文献(15)

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文章访问数: 462
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三维波浪作用下钢吊箱围堰下放过程受力研究

doi: 10.3969/j.issn.0258-2724.2018.03.013

作者简介: 黄博(1992-), 男, 博士研究生, 研究方向为桥梁结构动力学及桥梁风浪耦合动力学, E-mail:bohuang-swjtu@my.swjtu.edu.cn

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Study of Three-Dimensional Wave Forces on Lowering of Steel-Suspending Cofferdam

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目录

作者简介:
黄博(1992-), 男, 博士研究生, 研究方向为桥梁结构动力学及桥梁风浪耦合动力学, E-mail:bohuang-swjtu@my.swjtu.edu.cn