【摘要】：散體沙動(dòng)水休止角是表征沙丘、沙洲等散體沙堆積體穩(wěn)定形態(tài)的重要特征參數(shù),在岸坡穩(wěn)定分析、壩前沖刷漏斗形態(tài)研究中有著廣泛的應(yīng)用。采用室內(nèi)試驗(yàn)的方法研究了側(cè)向水流作用下不同粒徑天然均勻散體沙水下休止角的變化規(guī)律。結(jié)果表明:在水流流速超過泥沙顆粒起動(dòng)流速后,天然散體沙水下休止角隨流速增大而減小,且減小的速度隨著流速的進(jìn)一步增加而更加迅速;相同流速條件下,粗顆粒泥沙的水下休止角大于細(xì)顆粒,其對(duì)流速變化的敏感度也低于細(xì)顆粒�；趥�(cè)向水流邊坡上泥沙顆粒的受力分析,引入相對(duì)流速概念,初步建立了側(cè)向水流作用下均勻散體沙動(dòng)水休止角計(jì)算公式及其簡(jiǎn)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.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11472199)
【分類號(hào)】：TV149

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