无黏性颗粒柱坍塌流动的尺寸效应分析
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国家自然科学基金资助项目(12272158,11872028)


Analysis of size effect in the collapse and flow of cohesionless granular columns
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    摘要:

    为分析离散介质流动性的尺寸效应,揭示工程实际中不同尺度质量流的瞬态流动行为,运用粒子高速测量装置和自主搭建的准二维颗粒坍塌实验平台,对无黏性颗粒柱在重力驱动下的坍塌流动过程进行了研究,通过粒子图像测速(PIV)技术分析了柱体纵横比和初始尺寸对颗粒坍塌后流动性和堆积形态的影响。研究结果表明,不同初始长度的颗粒柱坍塌后流动前端位置随时间的演化表现出了相似的特征,但是系统尺寸的变化对其最终的堆积形态会产生明显的影响,尤其是流动距离。通过分析尺寸效应消失的临界长度,建立了无黏性颗粒柱坍塌后流动距离与其纵横比和初始长度之间满足的标度关系,该关系可以准确描述系统尺寸变化对颗粒流动性产生的影响。

    Abstract:

    In order to analyze the size effect in discrete material flow and reveal transient behaviors of the mass flows in engineering practice at different scales, the experiment systematically investigated the collapse and flow process of the cohesionless granular columns driven by gravity using the particle high-speed measurement device and a constructed quasi-2D particle collapse experimental platform. The influences of column aspect ratio, as well as initial system size on the mobility and deposit morphology of the collapsing material were mainly analyzed by the particle image velocimetry(PIV)technique. The results showed that the flow front position of the granular columns with different initial lengths exhibited similar evolving characteristics with time, but the size change of the system had a significant effect on its final deposit morphology, especially the flow distance. By analyzing the critical length at which the size effect disappears, a scaling law of flow distance of a granular column with its aspect ratios and initial length was proposed, which can be used to accurately characterize the effect of column size on the mobility of collapsing material.

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孙英皓,牛志扬,王等明.无黏性颗粒柱坍塌流动的尺寸效应分析[J].上海理工大学学报,2023,45(6):567-573.

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  • 收稿日期:2023-09-22
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  • 在线发布日期: 2023-12-28