分层河床桩柱冲刷试验研究  

Experimental Study on Scour of Pile Column in Layered Riverbed

作　　者：王瑞锋 杨元平 张芝永 WANG Rui-feng;YANG Yuan-ping;ZHANG Zhi-yong(Zhejiang Institute of Hydraulics and Estuary(Zhejiang Institute of Marine Planning and Design),Hangzhou 310020,China;Key Laboratory of Estuary and Coast of Zhejiang Province,Hangzhou 310020,China)

机构地区：[1]浙江省水利河口研究院(浙江省海洋规划设计研究院),浙江杭州310020 [2]浙江省河口海岸重点试验室,浙江杭州310020

出　　处：《水电能源科学》2024年第10期87-91,共5页Water Resources and Power

基　　金：浙江省水利科技计划项目(RC2020,RC1907)。

摘　　要：潮汐河口河床泥沙受不同年代沉积影响具有分层特性,对极端动力作用下河床的构筑物局部冲刷模拟结果的影响较大。依托钱塘江上游河段的天然河床质,在不同代表性的分层河床条件下采用正态水槽模型试验的方法对桩柱基础的局部冲刷进行研究,探索了上层沙易冲、上层沙难冲两种分层结构的局部冲刷发展过程和表底层沙掺混特征,揭示了桩基局部冲刷深度随上层沙厚度的变化规律,并通过量纲分析构建了分层沙条件下的冲刷深度理论计算方法,经验证该公式适用于天然江道冲刷和模型冲刷,可用于分层河床的桩基冲刷计算。The sediment in the riverbed of the tidal estuary was stratified by the deposition of different ages,which has a great influence on the results of local scour simulation of riverbed structures under extreme dynamic action.Based on the natural riverbed in the upper reaches of Qiantang River,the local scour of pile foundation was studied by normal flume model test under different representative layered riverbed conditions.The evelopment process of local scour and the mixing characteristics of surface and bottom sand under the two layered structures of upper sand relatively easy or difficult to scour were explored.The variation law of local scour depth of pile foundation with the thickness of upper sand was revealed.The theoretical calculation method of scour depth under the condition of layered sand was constructed by dimensional analysis.It was verified that the formula is suitable for natural channel scour and model scour,and can be applied to the calculation of pile foundation scour in layered riverbed.

关 键 词：分层河床 桩柱 局部冲刷 正态模型 水槽试验 

分 类 号：TV83[水利工程—水利水电工程]