非恒定流作用下丁坝坝体块石运动特点分析

Movement Characteristics of Spur Dike Stones under Unsteady Flow

通过水槽概化模型试验,研究天然河流日均流量过程作用下,丁坝冲刷及破坏机理及其周围床面变形过程,模拟丁坝坝头及坝身的坍塌过程,弄清丁坝坝头、坝身及冲刷坑内块石的运动特点并分析其形成原因,结果表明坝体块石的运动与来流过程、坝体周围床面及冲刷坑内泥沙运动方式、坝体透水性等有关。

Through a flume model test and under the action of the average daily flow process of natural river ,the scouring and damage mechanism of spur dike and its bed-surface deformation process were researched ,and the collapse processes of the head and dam body of spur dike were simulated .Then the motion characteristics of spur dike stones were figured out ,and their reasons were analyzed .The result indicates that the movement of spur dike stones depends on the flow pro-cess ,the movement way of the sediment around spur dike ,and the dam body’s permeability of spur dike .