大比降卵砾石河流钢丝石笼防冲性能试验  

Scour prevention properties of steel gabions in large gradient gravel river

作　　者：付旭辉[1,2] 李义天[1] 杨胜发[2] 胡江[2] 

机构地区：[1]武汉大学水剃水电学院,湖北武汉430072 [2]重庆交通大学河海学院,重庆400074

出　　处：《武汉大学学报（工学版）》2010年第4期419-422,共4页Engineering Journal of Wuhan University

基　　金：十一五国家科技支撑计划项目(编号:2008BAB29B08)

摘　　要：采用自相似动床模型实验的方法,研究在我国西北地区大比降卵砾石河流中广泛应用的钢丝石笼在大角度入射的股流冲刷下的防护特性.分析了钢丝石笼防护下的导流堤前的水流特点、冲刷机理,并研究在比降大、床沙粒径大、水流宽浅、流速大的水流环境下,不同防护宽度、埋置深度和不同钢丝石笼厚度的防护方案条件下,防护结构前沿的冲刷深度,得到防护宽度是钢丝石笼防护的关键参数的结论.提出在大比降卵砾石河流中,2m的埋置深度下、6m以上的防护宽度能有效防护30°以下入射的单宽流量小于3m^3/(s·m)的股流冲刷,可为该种防冲结构的设计应用提供参考.Based on the physical model of movable bed,the scour prevention properties of steel gabion under large angle stream erosion are analyzed which is wide used in large gradient gravel river in Northwest China.The flow characteristics in front of regulation buildings are studied to get the stream erosion principle for various steel gabion sizes,lengths and embedment depths.And the length of steel gabion is found to be the key factor which influences the scour prevention effect.Then the suitable scour prevention structure is put forward that the steel gabion structure set up more than 6m wide and 2m embedment depth could keep the regulation buildings safe under the erosion of flow less than 3 unit discharge and angle less than 30°.The research results provide reference for the design and use of steel gabions.

关 键 词：大比降卵砾石河流 钢丝石笼 动床模型 

分 类 号：TU289[建筑科学—建筑设计及理论]