基于阻力相似条件下的桩群物理模型设计方法  

Design Method of Piles Physical Model Based on Piles Resistance Similarity

作　　者：杨星[1] 王娅娜[1] 

机构地区：[1]河海大学交通与海洋学院,江苏南京210098

出　　处：《四川大学学报（工程科学版）》2010年第2期88-92,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(5079032)

摘　　要：在Froude数相等的水力模型中,按模型比尺缩小桩群结构,模型雷诺数减小,其阻力系数与原型不相等。为了研究模型满足桩群的整体阻力相似条件,在30m长、3m宽、0.26m深的循环水槽中进行一系列桩群阻力试验,得出桩群阻力系数与桩数、桩距、桩排列方式的关系。根据试验数据和相关的文献资料成果,按照阻力相似理论进行实际码头桩群模型设计,在保证阻力系数相似的前提下提出了模型码头桩群的设计方法。结果表明,考虑阻力相似设计的物理模型试验可以更好地反映实际桩群工程附近的流场分布和流态,为工程区域的泥沙冲淤模拟和地形验证提供了水流条件。In the test of hydraulic model with equal Froude number,the Reynolds number is decreased,due to the reduced structure of pile group according to model scale,and the model-prototype resistance coefficient of piles is not equal.In order to solve this problem and study the drag force of water flow around piles,an experimental work was conducted in a re-circulating flow tank（30 m long,3 m wide,0.26 m deep）.Results revealed the relationship between piles resistance coefficient and pile number,pile spacing and pile arrangement.Based on the experimental results and achievements of related literature,the piles resistance similarity theory was developed for the piles physical model test.Research results showed that the physical model test which considered the resistance similarity of piles can offer more accurate predictions of the water flow and sediment movement

关 键 词：物理模型 阻力相似 模型比尺 循环水槽 桩群 

分 类 号：TV135[水利工程—水力学及河流动力学]