丹江口堰顶溢流坝下游河床,由于受基岩构造特性的影响,产生较大的冲刷。为了论证原型观 测成果,模型利用岩块放大法,采用4种不同粒径松散碎石的动床试验,对坝下游河床的冲刷, 进行了复演试验。试验表明:冲坑深度当模型动床碎石换算粒径比原型 冲坑冲出的块石粒径大,(约2.25倍)时,原型和模型能吻合,但冲刷坑的形状, 两者不尽相同。

River bed in the downstream of spillweir of Dangjiangkou Project has produced in tensive scour owing to the effect of fracture properties of foundation rock. For examining the field observation results,the reproductive tests were performed f or river bed scour in the downstream of the dam by using amplified rock block me thod with four kinds of crushed stones of different particle sizes. The results showed that the depths of scour holes in prototype and in model are close to eac h other when the model converted particle size is about 2.25 times larger th an that of prototype.