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首页> 外文期刊>Acta Geotechnica: An International journal for Geoengineering >Simulation of quasi-static axisymmetric collapse of granular columns using smoothed particle hydrodynamics and discrete element methods
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Simulation of quasi-static axisymmetric collapse of granular columns using smoothed particle hydrodynamics and discrete element methods

机译：使用平滑粒子流体动力学和离散元件模拟粒状柱的准静态轴对称塌陷

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摘要

Flow of granular materials under different conditions poses significant challenges to engineers as their behavior can vary from solid-like to fluid-like. The quasi-static axisymmetric collapse of granular columns is an interesting case of granular flow relevant to the active deformation of retaining structures. This study aims to shed light on this type of collapse using numerical simulations including the smoothed particle hydrodynamics (SPH) method in the continuum framework and the discrete element method (DEM) in the discrete framework. Three-dimensional SPH and DEM models are developed to investigate the quasi-static axisymmetric collapse of granular columns, which is initiated by slowly expanding the cylindrical wall of the column. The Drucker-Prager constitutive model with non-associated flow rule is implemented into SPH formulations to model elastoplastic behavior of granular material. The linear contact model is used in DEM simulations with calibrated contact stiffness parameters. The effects of particle shape and hysteretic contact behavior in the DEM model are indirectly considered through reducing particle rotational velocities by a calibrated constant factor at every time step. Using the developed models, the final deposit profile (e.g., height, runout distance, repose angle), non-deformed region, collapse pattern and energy dissipation for different initial aspect ratios are investigated. In addition, final height, runout distance and energy dissipation are theoretically derived and are found to be in good agreement with SPH and DEM simulations. Results show that the quasi-static axisymmetric collapse can be modeled using both the continuum and discrete frameworks as long as appropriate constitutive models or contact behaviors are implemented. However, DEM simulations are more capable of capturing particle-level behaviors, such as the sharp edges of the free surface and flow front. Results demonstrate that quasi-static granular collapse is qualitatively similar to the dynamic collapse, but results in smaller runout distances for all aspect ratios.
机译：在不同条件下的粒状材料流向工程师对工程师产生重大挑战，因为它们的行为可以从固体变化到液体状。粒状柱的准静态轴对称塌陷是与保持结构的主动变形相关的粒状流动的有趣情况。本研究旨在使用连续框架中的连续框架中的平滑粒子流体动力学（SPH）方法以及离散框架中的离散元件方法（DEM）中的数值模拟来阐明这种类型的崩溃。开发了三维SPH和DEM模型以研究粒状柱的准静态轴对称塌陷，这通过缓慢膨胀柱的圆柱形壁而启动。具有非相关性流量规则的Drucker-Prager本构模型被实施为SPH配方以模拟颗粒材料的弹性塑性行为。线性触点型号用于DEM仿真，具有校准接触刚度参数。通过每次步骤时通过校准的恒定因子降低粒子旋转速度，间接地考虑DEM模型中的颗粒形状和滞后接触行为的影响。使用开发的模型，对不同初始纵横比的最终沉积曲线（例如，高度，跳动距离，休旋转角），非变形区域，塌陷模式和能量耗散进行了研究。此外，理论上，最终高度，跳动距离和能量耗散是与SPH和DEM模拟的良好协议。结果表明，只要实现了适当的本体模型或联系行为，可以使用连续内和离散框架建模准静态轴对称塌陷。然而，DEM仿真更能够捕获粒子级行为，例如自由表面的尖锐边缘和流动前沿。结果表明，准静态颗粒塌陷与动态塌陷定性类似，但导致所有宽高比的跳动距离较小。

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