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通过室内人工放水冲刷试验,探究不同流量(2L/min,4L/min,8L/min,16L/min)和砾石含量(0%,20%,40%,60%)条件下,土石混合崩积物坡面产沙特征。结果表明:各条件下产沙过程均呈先增大后减小再趋于稳定的趋势。产沙量随着流量的增大而增大,而含沙量随流量的增大总体呈减小的趋势;在2L/min和4L/min条件下,产沙量及含沙量随着砾石含量的增大呈先减小后增大的趋势,存在临界砾石含量(20%~40%);在8L/min和16L/min条件下,产沙量及含沙量随着砾石含量的增大而增大。产沙率与含沙量的关系表明,含石量对产沙的影响存在临界含石量(20%~40%)。砾石含量和流量可以用来很好地预测土石混合崩积物的产沙率,但对含沙量的预测效果较差。流量对产沙率及含沙量的影响均大于砾石含量。
Through the indoor artificial flushing test, the soil-stone mixing and sedimentation under different flow rates (2L / min, 4L / min, 8L / min, 16L / min) and gravel content (0%, 20%, 40%, 60% Slope characteristics of sand production. The results show that the sediment yield increases first, then decreases and then tends to be stable. The sediment yield increased with the increase of the flow rate, while the sediment concentration showed a decreasing trend with the increase of the flow rate. Under the conditions of 2L / min and 4L / min, the sediment yield and sediment concentration increased with the gravel The content of gravel increased firstly and then increased, and the critical gravel content (20% ~ 40%) existed. Under the conditions of 8L / min and 16L / min, the sediment yield and sediment concentration increased with the gravel content Big and big. The relationship between sediment yield and sediment concentration shows that there is a critical mass of stone (20-40%) in the impact of rock content on sediment yield. The gravel content and flow rate can be used to predict the sediment yield of the mixture of soil and stone mixed well, but the prediction of sediment concentration is not effective. The impact of flux on sediment yield and sediment concentration is greater than the gravel content.