泥石流窗口坝是一种常见的泥石流防治工程措施，具有拦砂节流、护床固坡等重
要调节功能。为了探寻泥石流的过坝特征，本文通过室内模拟试验，运用控制变量的方法对
不同类型泥石流的过坝情况进行了探讨。试验发现，泥石流过坝前后颗粒组成的变化与泥石
流容重相关性较大，在泥石流容重为1.65×103kg/m3 时，窗口坝对泥石流的筛选能力最强；
泥石流过坝后容重降低情况较明显，并且受泥石流窗口坝闭塞类型的影响，不同闭塞类型下
泥石流容重降低率具有相似规律，在泥石流容重为1.8×103kg/m3 左右时，泥石流容重降低
率最大；通过回归分析得到了拦排比L 与泥石流容重的关系式：L= 1.944 2 - 6.17 +
5.864。本试验结果将对以后泥石流地区防治工程设计产生积极意义。

Debris flow is influenced by lots of factors, which have complex dynamic process, and generally bring about fierce and huge damages. In order to explore the characteristics of debris flow passing window dam, 4 groups experimental studies were carried out including different types of debris flow passing different window dams. The results show that: The composition of the debris flows in front and after the dam is correlation with the density of debris flow; When passing the dam, the density of debris flow is lower; Sediment retention ratio and intercept discharge rate are largely influenced by the blocking types of the dams.