本文選題：桿狀顆粒 + 長短軸之比��； 參考：《大連理工大學學報》2016年02期

【摘要】：桿狀顆粒由于其形狀與礫石、藥品和谷物等真實顆粒的形狀接近而受到研究者們的關注,其形狀特征常用長短軸之比進行表征.以往許多學者曾通過離散元法研究過在相同孔隙率下桿狀顆粒長短軸之比對其抗剪強度的影響,但在相同相對密度下的研究并不多見.通過控制顆粒摩擦因數(shù)形成具有相同相對密度的試樣,研究了0%、35%、65%及100%相對密度下顆粒的長短軸之比對試樣抗剪強度的影響規(guī)律.另外,還進行了相同孔隙率下的試驗以進行結果對比.研究結果表明,相同相對密度下,峰值狀態(tài)和臨界狀態(tài)時試樣剪應力隨長短軸之比增大而增大,與相同孔隙率下的結果一致,但峰值剪應力增大幅值要比相同孔隙率下的小.另外,對不同長短軸之比下試樣內摩擦角進行分析,發(fā)現(xiàn)臨界狀態(tài)時內摩擦角隨長短軸之比增大而增大,而峰值狀態(tài)時內摩擦角受長短軸之比的影響相對較小.最后從試樣剪脹性方面進行了分析,闡述了以上現(xiàn)象發(fā)生的機理.
[Abstract]:Because the shape of rod particles is close to that of gravel, medicine and grain, researchers pay attention to the shape characteristics of rod particles. The ratio of long axis to long axis is used to characterize the shape characteristics of rod particles. In the past, many scholars have studied the effect of the ratio of long and short axis of rod particles on the shear strength under the same porosity by discrete element method, but few studies have been done at the same relative density. By controlling the friction coefficient of particles to form samples with the same relative density, the influence of the ratio of the long and short axes of the particles on the shear strength of the samples with the relative density of 65% and 100% was studied. In addition, experiments with the same porosity were carried out to compare the results. The results show that at the same relative density, the shear stress increases with the increase of the ratio of long and short axes, but the amplitude of the increase of peak shear stress is smaller than that of the same porosity. In addition, it is found that the internal friction angle increases with the increase of the ratio of the long axis to the long axis at the critical state, but the ratio of the long axis to the short axis affects the angle of the internal friction at the peak state relatively little by the ratio of the long axis and the short axis. In the end, the mechanism of the above phenomena is explained by analyzing the shear dilatancy of the sample.
【作者單位】： 大連理工大學水利工程學院;
【基金】：國家自然科學基金資助項目(51479027,51539008)
【分類號】：O347.7

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