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在泥石流易发区，设置格栅坝，以期达到阻止泥石流的流动或起到消能的作用。以往的实践证明，同规格格栅坝拦截泥石流效果不十分理想。因此，在试验的基础上，研究了泥石流粒径、质量分数变化的特点，通过同规格及上部窄格模型坝拦截泥石流的模拟过流试验，分析7种格栅尺寸的坝型拦截泥石流的效果，得出如下结论：同规格及上部窄格格栅坝均能有效地拦截泥石流的龙头；泥砂量减少率随着上部的Linin／d95值的增大而减小，当Lmin/d95＜1．6时，减少率达到80％以上；且随着下部格栅间隔的增大而减小。因此，在具体设计时，应采用上部窄格的格栅坝型，下部格栅尺寸在考虑Lmin/d95的基础上，同时还应考虑Lmax／d95的比值。
Debris flow prone areas, the establishment of grid dam, in order to achieve the flow of debris flow to prevent or play a role in dissipating energy. Past practice has proved that the same size grid dam interception debris flow effect is not very satisfactory. Therefore, on the basis of the experiment, the characteristics of debris flow particle size and mass fraction change were studied. Through the simulation overcurrent test of intercepting debris flow in the same model and the upper narrow-grid model dam, the effects of seven grid-type dam interception debris flows were analyzed The conclusions are as follows: Both the same specification and the upper narrow grid dam can effectively intercept the faucet of debris flow; the reduction rate of sediment decreases with the increasing Linin / d95 of the upper part, when Lmin / d95 <1. 6, the reduction rate reached more than 80%; and with the lower grid spacing increases. Therefore, in the specific design, should be used in the upper part of the grid grille dam, the lower grille size in considering the Lmin / d95 basis, taking into account the ratio of Lmax / d95.