泥石流缝隙坝对龙头泥砂体积浓度变化影响试验研究

Experiment on Variety of Surge Sediment Volume Concentration with Debris Flow Passing Through Silt Dam

(1)通过前人研究成果及野外调查和预备试验,对泥石流龙头泥砂体积浓度变化影响因子进行分析,写出了其无因次关系式,并根据试验结果,建立了泥石流缝隙坝泥砂体积浓度比的多元回归关系式;(2)试验发现:在相同的水槽坡度和泥砂粒径组成的条件下,泥石流过坝前后的泥砂体积浓度比会受到切口密度、相对切口宽度和相对切口深度的影响,均呈现正相关的关系。

According to the results of previous studies and field investigations and preliminary tests, the affected factors of surge volume concentration of debris flow are analyzed and the non-dimensional relationship is duduced. In addition, the multi-analysis regression equation is established according to experiment results. The results also indicated that sediment volume concentration ratio is subject to incision density （Xb/B）, the relative width of incision （b/dgs） and relative depth of incision （h/He）, the impact showed a positive correlation relationship at the same flume slope and sediment size distribution.