摘要
本文设计了一种适用于复合式基础的多孔护圈,利用Flow-3D软件研究了单向流作用下护圈宽度、厚度、孔洞结构对基础周围水流情况、冲刷坑形态、冲刷时程特征的影响。研究结果表明,提升多孔护圈宽度可以降低桩前马蹄形漩涡的强度,减少基础附近的涡旋结构;提升多孔护圈厚度可以削弱尾涡强度,致使沉积物在基础下游形成淤积;孔洞结构可以扰乱护圈附近的水流边界层,减小基础周围的局部冲刷。其中,护圈厚度对多孔护圈冲刷防护性能的影响最为显著,护圈厚度由2 mm提升至3 mm,基础附近最大冲刷深度减少29.08%,冲刷开始的时间延迟近2.5倍。
Based on the theory of scour protection,a multihole collar for composite foundation was designed,and the effects of collar width,thickness,and pore structure on the water flow around the foundation,the morphology of scour pits,and the time course characteristics of scour were investigated by using Flow-3D software.The results show that increasing the width of the multihole collar can reduce the strength of the horseshoe vortex in front of the pile and reduce the vortex structure near the foundation;increasing the thickness of the multihole collar can weaken the strength of the tail vortex,resulting in siltation of sediments downstream of the foundation;and the pore structure can disrupt the boundary layer of the water flow near the collar and reduce the local scour around the foundation.Among them,the thickness of the retaining collar has the most significant effect on the scour protection performance of the multihole collar,when the multihole collar thickness was increased from 2 mm to 3 mm,the maximum scour depth near the foundation was reduced by 29.08%and the start of scouring was delayed by almost 2.5 times.
作者
刘红军
李祺恒
朱成浩
杨金木
Liu Hongjun;Li Qiheng;Zhun Chenghao;Yang Jinmu(College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Qingdao 266100,China)
基金
国家自然科学基金项目(41572247)
中央高校基本科研业务费专项(202161038,202261063)资助。
作者简介
刘红军(1967-),男,教授,主要从事海洋岩土工程等方面的教学和科研。E-mail:hongjun@ouc.edu.cn。
