不同倾角的侧向倾斜桩基础冲刷数值模拟研究  

Numerical study on foundation scour in laterally inclined pier with different angles

作　　者：张玉良 潘新颖[1] 于松宁 鲁友祥 ZHANG Yu-liang;PAN Xin-ying;YU Song-ning;LU You-xiang(School of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《泥沙研究》2022年第6期23-28,共6页Journal of Sediment Research

基　　金：国家重点研发计划项目(2021YFB2601100);国家自然科学基金重点项目(51739010)。

摘　　要：基于Flow-3d软件研究了直立桩以及侧向倾斜桩的基础冲刷状况,分析了不同倾斜角度的桩周流场、剪应力、涡量和冲刷形态。数值模拟结果分析发现,倾斜侧的无量纲最大床面剪应力与竖直桩基本相同,非倾侧的最大剪应力小于倾斜侧,桩前马蹄涡强度无明显变化,稳定在301/s左右,桩后尾涡偏向倾斜侧。流场变化导致了桩倾斜侧的最大冲刷深度与竖直桩相近,非倾侧冲刷深度小于倾斜侧,大倾角桩(20°和30°)桩后冲刷比小倾角桩(0°和10°)明显,泥沙淤积在桩后倾斜侧。定量研究倾斜角度对桩基冲刷影响有助于认识冲刷规律,优化桩基防护措施。Based on Flow-3 d software,the scouring of vertical pile and lateral inclined piles were studied.The flow field,shear stress,vorticity and scour morphology of piles with different inclined angles were analyzed.It is found that the dimensionless shear stress of the inclined side is the same as that of the vertical pile,and the maximum shear stress of non-inclined side is lower than inclined side.The horseshoe vortex strength in front of pile has no obvious change and is stable at about 301/s,while the trailing vortex is inclined to the tilting pile.As a result,the maximum scour depth on the inclined side is similar to that on the vertical side,and the scour depth on the non-inclined side is smaller than that on the inclined side.The scour depth of the piles with large inclined angles(β=20°and 30°)is bigger than that of the piles with small inclined angles(β=0°and 10°),and the sediment is deposited on the inclined side behind the pile.Quantitatively studying the influence of inclination angle on pile foundation scouring can contribute to understand the scouring law and optimize the protective measures of pile foundation.

关 键 词：清水冲刷 Flow-3d 桩基冲刷 倾斜桩 

分 类 号：U442.3[建筑科学—桥梁与隧道工程]