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在系列室内水槽试验中,运用黄河天然沙,中值粒径0.072 mm,通过11组水流挟带泥沙自然淤积的方式分3种固结历时研究了淤积固结过程中干容重的变化,并用清水进行冲刷,重点探讨了干容重取值对冲淤量的影响.结果表明:淤积物干容重随淤积历时的延长而增加,并且越靠近出口,淤积物中值粒径越细,干容重稳定所需要的固结时间越久;计算冲淤量时选取实测值越多精度越高;而经验取值误差较大,甚至有可能出现定性错误;对于相同的淤积体积,淤积历时越长,淤积量越大;在淤积体积相同的条件下冲刷相同的体积,淤积历时短的冲刷量大.
In the series of indoor tank experiments, the change of dry bulk density during silting and consolidation was studied by means of natural sediment of the Yellow River with a median diameter of 0.072 mm and by means of natural sediment entrainment in 11 groups of water streams. The results showed that the dry weight of sediment increased with the prolongation of siltation, and the closer to the exit, the finer the median diameter of sediment, the stable of dry weight The longer the consolidation time is needed; the more the measured value is selected when calculating the amount of scouring and silting, the higher the accuracy is; and the larger the error of the empirical value is, the qualitative error may even occur. For the same silting volume, Large; the same volume in the siltation under the same volume of erosion, siltation lasted a short amount of erosion.