缝隙中脉动压力传播模型的进一步探讨  

Further discussion on propagation model of fluctuating pressure within cracks

作　　者：李爱华[1] 朱江[1] 李成华[1] 

机构地区：[1]中国石油大学(华东),山东青岛266580

出　　处：《水利学报》2015年第5期626-630,共5页Journal of Hydraulic Engineering

基　　金：中央高校基本科研业务费专项资金(12CX04024A;13CX02048A)

摘　　要：高坝下游冲坑的形成发展以及水垫塘底板块的揭底破坏与河床岩石裂隙、衬砌底板缝隙中脉动压力的传播、叠加作用密切相关。缝隙中脉动压力的传播模型有渗流模型、振荡流模型以及瞬变流模型。理论分析证明:3种模型是从不同的动力分析角度研究脉动压力的传播规律,适用于不同的冲刷阶段,但3种模型从根本上是统一的。渗流模型适用于缝隙堵塞较为严重的情况;当缝隙贯通后,水力瞬变作用显著,产生脉动上举力,应用瞬变流模型进行分析更为合理;而当块体在坐穴中做随机振动时,适用于采用振荡流模型。Development of scour pools and dislodgment of lining slabs downstream of high dams are caused by propagation and superposition of fluctuating pressure waves within cracks. Three models of fluctuating pressure propagation with cracks are proposed, i.e. seepage model, vibrating model and transient model. By theoretical analysis, it is verified that the three models are based on different dynamic aspects to study the mechanism of pressure transmission and are adoptable to different scour stages, but they are uniform in es- sence. The seepage model is suitable when the cracks are severely blocked. If the cracks are linked up with each other, the role of hydro-transient is significant and the fluctuating uplift generates consequently. In this condition, the transient model is more reasonable. When the blocks are vibrating randomly within their matrix, the vibrating model is adopted.

关 键 词：脉动压力 渗流模型 振荡流模型 瞬变流模型 

分 类 号：TV135.2[水利工程—水力学及河流动力学]