利用大型水槽和泥石流拦砂坝模型,开展了坝前堆积和沟床坡度对拦砂坝底扬压力的影响试验。结果表明:(1)坝前堆积物的渗透性对坝底扬压力影响显著,渗透性越好,作用于坝底的扬压力越大,反之则越小;(2)扬压力随着距坝踵距离的增大而减小,即扬压力从拦砂坝上游至下游逐渐变小;(3)沟床坡度对坝底扬压力的影响显著,沟床坡度越大,作用于坝底扬压力越小。 Based on the model of large-sized sink and debris flow dam, the effects of the accumulation of dams and the slope of ditch bed on the uplift pressure of the dam are studied. The results show that: (1) The permeability of the sediment in front of the dam has a significant effect on the uplift pressure at the dam bottom, and the better the permeability, the greater the uplift pressure acting on the dam bottom, and vice versa; (2) (3) The influence of gully slope on the uplift pressure at the bottom of the ditch is significant, and the greater the ditch slope is, the greater the ditch pressure is at the bottom of the dam The smaller.