摘要
高坝下游岩石河床受高速水流冲击作用,天然裂隙不断扩展和交互并形成充分发展的裂隙网络。基于裂隙中水流脉动压力传播机理以及孤立块体的稳定特性,本文提出了高坝下游岩石河床逐层冲刷破坏的物理概念模型。并针对溪洛渡水电站坝区岩石河床的冲刷机理和过程展开数值模拟研究,得出基岩在各个冲刷阶段的冲坑几何特性以及平衡冲坑深度,模拟结果与前人经验结果吻合较好。在高坝下游冲刷过程中引入基岩裂隙网络,能够真实的反映冲坑的发展过程,是水利研究方法的突破,其结果是可信的。
Rock fractures expand, intersect and develop into fractures network downstream of dams under action of high-speed impinging jet. This paper considers stability of fractured rock blocks and fluctuating pressure propagation within such fractures network, and puts forth a physical conceptual model of layer-by-layer rock bed scour. Appling this model to Xiluodu dam, the scour process of its rock bed was numerically simulated, and the geometry features and limited scour pool depth for each scour stage were obtained. These results were verified by comparing with the published calculations with empirical equations. Thus, the model equipped with a novel generalization of complicated rock fractures network, can creditably simulate the real development of scour pool.
出处
《水力发电学报》
EI
CSCD
北大核心
2012年第5期154-158,共5页
Journal of Hydroelectric Engineering
基金
国家自然科学基金面上项目(51179201
10772015)
中央高校基本科研业务弗专项资金(27R1202009A)
关键词
水力学
冲坑深度
数值模拟
脉动压力
裂隙网络
hydraulics
scour depth
numerical simulation
fluctuating pressure
fractures network
