新型屋脊式拦砂坝拦挡输移性能试验研究
Experimental Study of Preventing Debris Flow by Type Debris Dam
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摘要: 随着人们对泥石流拦砂坝的研究与应用，拦挡结构从竖向拦挡逐渐向水平筛分发展。为了对泥石流进行有效筛分和减小泥石流冲击力，提出新型屋脊式拦砂坝，并通过试验研究其对泥石流的拦挡筛分效果。本文通过试验，模拟不同泥石流来量、坝体格栅间距和坝体长度情况下，新型结构对泥石流的拦挡筛分效果（速度变化率、储流比、浆砂分离率）。试验结果表明：增加拦砂坝长度和减小格栅间距都会提高泥石流流速变化率；随着泥石流来量和坝体格栅间距增大，储流比反而减小，储流比最高能达到87.13%；新型结构对泥石流的拦粗排细效果较好，浆砂分离率随格栅间距增加呈现出先升高后降低的趋势，最高可达82.45%；通过二次式拟合得到格栅间距为d85时浆砂分离率最高，推荐将d85作为格栅间距。
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