倾斜沙漏流与颗粒休止角研究

发布时间：2018-05-30 03:14

  本文选题：倾斜孔洞流 + 休止角　； 参考：《西北师范大学》2016年硕士论文

【摘要】：就颗粒体系而言,休止角是反应体系内部力学关系的重要物理参量,对研究颗粒体系的流动性和坡面稳定性有着重要的参考价值.在散体介质力学,泥沙涌动力学以及堤坝、洲体失稳等实际问题的研究中,休止角体现了十分重要的工程应用价值和科学理论意义.对于新近提出的倾斜孔洞流用于颗粒堆休止角的测量方法进行了系统及扩展实验研究.系统测量了样品颗粒在不同倾角的管道中,受重力作用通过不同尺寸孔洞的卸载流量.验证流量Q与倾角的余弦值cosθ以及临界流量休止角θc与粒径-孔径(d/D)的良好线性关系.由此得到在大孔径极限情况下θc的线性外推角θc∞≡θc(D→∞)我们将此角与直接测量流量停止的倾斜角θs∞,样品颗粒在光滑表面自然堆积的休止角θr,和通过直剪实验测得的样品内摩擦角φ进行了比较,发现θc∞,θs∞,θr,φ的值能很好的吻合.本文实验研究倾斜孔洞流流量外插法测量休止倾角与现有方法的比较,认为此方法能很好的排除人为测量误差,较精确的测量休止倾角.
[Abstract]:As far as the particle system is concerned, the angle of repose is an important physical parameter of the mechanical relationship within the reaction system, which has important reference value for the study of the fluidity and slope stability of the particle system. The angle of repose reflects the very important engineering application value and the scientific theoretical significance in the study of bulk medium mechanics, sediment surge dynamics, dyke and bar instability and so on. The newly proposed method for measuring the angle of repose of particles by slanting hole flow is studied systematically and experimentally. The unloading flow rate of sample particles through different sizes of holes in pipes with different inclination angles was systematically measured under the influence of gravity. The good linear relationship between the cosine value of flow Q and dip angle cos 胃 and the critical flow angle of repose 胃 c and the particle size-aperture d / D) is verified. The linear extrapolation angle of 胃 c is obtained in the case of large aperture limit. The angle of repose 胃 r, which is deposited naturally on the smooth surface, is compared with the friction angle 蠁 measured by direct shear test. It is found that the values of 胃 c 鈭，

本文编号：1953667