通过特殊泥石流试验装置, 对泥石流梁式格栅坝拦砂性能进行研究, 初步得到: 梁式格栅坝有全部闭塞、临时闭塞、半闭塞、未闭塞4 种闭塞类型。当梁间距b 与泥石流体中最大颗粒粒径dmax 之比b/dmax≤1. 0 时, 格栅坝基本闭塞; bö dmax≥1. 5 时, 格栅坝未闭塞; 1. 0< b/dmax< 1. 5 时, 格栅坝半闭塞或临时闭塞。试验结果表明,梁式格栅坝闭塞与沟道纵坡有较大关系, 结构尺寸相同的格栅坝在通过相同泥石流时, 在不同沟道纵坡条件下有不同闭塞效果。

By using a special experimental devices of debris flow , a serise of model tests on debris flow passing through check-dem are carried out. The shape of cross-section of model channel is rectangle with a width 25cm , the gradient is 0～ 25%. The solid material used in the test are take from hengdu city, the gravelps max imum diameter is 5cm , 10cm , 15cm , 20cm , 25cm , 30cm , 35cm. The distance between beam is 1.5cm , 2.0cm , 3.0cm. The experimental results show that there are 4 main kind of closing conditions, the closing conditions of check dam are closely linked to the ratiob/dmax of distance between beam to the gravelps max imum , and the gradient of channel.