侧向水流作用下均匀沙休止角变化的试验研究
发布时间：2019-01-14 17:23
【摘要】：散体沙动水休止角是表征沙丘、沙洲等散体沙堆积体稳定形态的重要特征参数,在岸坡稳定分析、坝前冲刷漏斗形态研究中有着广泛的应用。采用室内试验的方法研究了侧向水流作用下不同粒径天然均匀散体沙水下休止角的变化规律。结果表明:在水流流速超过泥沙颗粒起动流速后,天然散体沙水下休止角随流速增大而减小,且减小的速度随着流速的进一步增加而更加迅速;相同流速条件下,粗颗粒泥沙的水下休止角大于细颗粒,其对流速变化的敏感度也低于细颗粒。基于侧向水流边坡上泥沙颗粒的受力分析,引入相对流速概念,初步建立了侧向水流作用下均匀散体沙动水休止角计算公式及其简化形式。
[Abstract]:The dynamic angle of repose is an important characteristic parameter to characterize the stability of sand deposits such as sand dunes and sandbanks. It is widely used in slope stability analysis and in the study of the shape of scour funnel in front of dam. The variation of underwater angle of repose of natural distributed sand with different particle sizes under the action of lateral flow was studied by means of laboratory tests. The results show that when the flow velocity exceeds the initial velocity of sediment particles, the underwater angle of repose of natural loose sand decreases with the increase of velocity, and the decreasing velocity increases more rapidly with the further increase of velocity. At the same flow rate, the underwater angle of repose of coarse sediment is larger than that of fine particles, and its sensitivity to velocity variation is lower than that of fine particles. Based on the stress analysis of sediment particles on the lateral flow slope and the introduction of the concept of relative velocity, the formula for calculating the dynamic angle of repose of uniform loose sand under the action of lateral flow and its simplified form are established.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(11472199)
【分类号】：TV149
本文编号：2408924
[Abstract]:The dynamic angle of repose is an important characteristic parameter to characterize the stability of sand deposits such as sand dunes and sandbanks. It is widely used in slope stability analysis and in the study of the shape of scour funnel in front of dam. The variation of underwater angle of repose of natural distributed sand with different particle sizes under the action of lateral flow was studied by means of laboratory tests. The results show that when the flow velocity exceeds the initial velocity of sediment particles, the underwater angle of repose of natural loose sand decreases with the increase of velocity, and the decreasing velocity increases more rapidly with the further increase of velocity. At the same flow rate, the underwater angle of repose of coarse sediment is larger than that of fine particles, and its sensitivity to velocity variation is lower than that of fine particles. Based on the stress analysis of sediment particles on the lateral flow slope and the introduction of the concept of relative velocity, the formula for calculating the dynamic angle of repose of uniform loose sand under the action of lateral flow and its simplified form are established.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(11472199)
【分类号】：TV149
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