波流作用下环行桩群结构局部冲刷试验研究

发布时间：2017-12-27 15:45

本文关键词：波流作用下环行桩群结构局部冲刷试验研究　出处：《人民长江》2017年S1期 　论文类型：期刊论文

【摘要】：环行桩群结构引起的局部冲刷会导致结构失稳,利用系列模型延伸法开展波流作用下环形桩群局部冲刷物理模型试验研究,可以更加清楚地认识基础结构的冲刷规律。该物理模型中流态表明,波流共同作用时,在基础结构处形成"漩涡状圆环"褶皱,波浪绕过基础结构后,圆环向两侧发散,此形态是波浪绕射的结果。物理模型局部冲刷试验表明环形桩群冲刷形态主要有4种,分别为基桩前部冲刷、环形桩群基桩两侧绕流冲刷、环形桩群基桩个体冲刷和环形桩群基桩尾流冲刷,基桩个体冲刷叠加在群桩冲刷基础之上,冲刷形态与环形桩群结构及动力特征一致。极端高潮位条件下,最大冲刷深度为8.42 m,冲刷深度-3.00 m(深度从床面向下)以上范围横向、纵向均为40.00 m左右,即沿高桩承台中心约20.00 m半径范围。物理模型试验较好地体现了环形桩群波流冲刷特征。
[Abstract]:The local scour caused by circular pile group structure will lead to structural instability. Based on the series model extension method, the physical model test of local scour around annular piles under wave current action can be carried out, and the scour law of foundation structure can be more clearly understood. The flow pattern in the physical model indicates that when the wave and current work together, a vortex shaped ring folds are formed at the base structure, and the waves diverge to the two sides after the waves pass through the foundation structure, which is the result of wave diffraction. The physical model of local scour test shows that there are 4 main types of annular pile group erosion patterns, respectively, in front of pile pile group pile foundation scour ring on both sides of scour, the annular pile group pile and pile group pile foundation scour individual ring wake erosion, erosion superimposed on individual pile group pile foundation scour, scour and circular pile group the structure and dynamic characteristics consistent. Under extreme high tide conditions, the maximum scour depth is 8.42 m, and the scour depth is -3.00 m (depth from the bed down). The horizontal and vertical direction is 40 m, that is, 20 m radius along the center of the high pile cap. The physical model test shows the characteristics of the wave flow erosion of the ring pile group.
【作者单位】：上海临港海上风力发电有限公司;南京水利科学研究院河流海岸研究所;
【基金】：上海市科学技术委员会资助项目(13dz1202201)
【分类号】：P731.2;P75
【正文快照】： 近年来近海建设的很多海洋结构局部范围海床都发生了冲淤变化,较大的冲淤变化会对海洋结构的稳定、安全造成不利影响[1-2]。本文所研究的环行桩群水中部分由8根斜桩组成,通过承台连接为整体,承台直径为14.00 m,厚度为4.50 m,斜桩直径为1.70 m,斜度为5.5∶1,图1为该桩群形状及

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