Accuracy of dynamic disk-based DDA with respect to a single sliding disk cluster
Accuracy of dynamic disk-based DDA with respect to a single sliding disk cluster
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DOI：
10.1080/17486025.2013.838645
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
S. Beyabanaki;A. Bagtzoglou
中科院分区：
文献类型：
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作者：
S. Beyabanaki;A. Bagtzoglou
圆盘簇的开发是为了更精确地表示颗粒材料的形状（与圆形颗粒相比）并最大限度地减少过度滚动。研究盘簇动态盘不连续变形分析 (DDA) 的行为对于评估基于盘的 DDA 对地质力学动态问题的适用性非常重要。本文通过综合敏感性分析研究了动态条件下基于磁盘的DDA的精度。将基于盘的 DDA 获得的结果与仅受重力作用的斜面上盘簇的解析解以及随着正弦输入函数和重力载荷而增加复杂性的三种不同加速度进行比较。本研究主要研究了时间步长和界面摩擦角对结果的影响。总体而言，速度和位移的大部分误差都发生在求解开始时。随着摩擦角的增加，解的初始扰动在仅在重力作用下滑动的情况下增加，而在动载荷下滑动的情况下减小。这项研究表明，基于磁盘的 DDA 可以准确预测相对于斜坡提供的摩擦阻力得出的速度和位移。
Disk clusters are developed to represent the shape of granular materials more precisely (compared to circular particles) and to minimise excessive rolling. Investigating the behaviour of dynamic disk-based discontinuous deformation analysis (DDA) with disk clusters is very important to evaluate the applicability of disk-based DDA to dynamic problems in geomechanics. In this paper, the accuracy of disk-based DDA under dynamic conditions is studied by a comprehensive sensitivity analysis. The results obtained by disk-based DDA are compared with the analytical solutions of a disk cluster on an incline subjected to gravitational force only, and three different accelerations of increasing complexity with sinusoidal input functions as well as gravitational load. In this research, the effects of time step size and interface friction angles on the results are studied. Overall, most of the error for both velocity and displacement occurs at the beginning of the solution. With increasing friction angle, the initial perturbation of the solution increases in the case of sliding under gravitational force only, and decreases in the case of sliding under dynamic loads. This study shows that disk-based DDA predicts accurately the velocities and displacements derived with respect to the frictional resistance offered by the inclines.