汇流条件下多层可侵蚀介质逆向侵蚀的粒子尺度研究:实验测试与数值模拟

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Gang Zheng, Zhitong Chen, Tianqi Zhang, Huimin Qiu, Ke Wang, Yu Diao
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引用次数: 0

摘要

地下结构底部的渗漏会迫使地下水形成汇流,在汇流作用下可能会发生土壤侵蚀,从而威胁结构的安全。以往的研究表明,汇流可能会诱发逆向侵蚀,而揭示这种侵蚀背后的机理对于减轻实际工程中的灾害至关重要。现有的相关研究仅限于单层可侵蚀介质,而多层可侵蚀介质在汇流作用下的反向侵蚀机理尚不清楚。在本研究中,基于验证的计算流体动力学和离散元耦合方法(CFD-DEM)进行了实验测试和数值模拟,以研究多层样品在汇流下的反向侵蚀。结果表明,多层样品被逐层侵蚀,在样品底部可以观察到残余层。不同层的侵蚀区域形状相似,但较低层的侵蚀区域尺寸较小。此外,在侵蚀过程中,不同层之间会发生颗粒交换。一般来说,下层颗粒可以直接上升到侵蚀区域的上层,而上层颗粒则主要沉降在侵蚀区域的外围。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Particle-scale study on backward erosion of multilayer erodible medium under converging flow: experimental tests and numerical modelling

Particle-scale study on backward erosion of multilayer erodible medium under converging flow: experimental tests and numerical modelling

Leakage at the bottom of an underground structure can compel ground water to form a converging flow, under which soil erosion may occur, thereby threatening the safety of the structure. Previous studies have shown that converging flow may induce backward erosion, and unravelling the mechanism behind this type of erosion was pivotal to mitigating disasters in practical engineering. Existing studies on this topic have been limited to monolayer erodible medium, while the mechanism behind the backward erosion of a multilayer erodible medium under converging flow remains unclear. In this study, both experimental tests and numerical simulations based on the validated computational fluid dynamics and the discrete element coupling method (CFD–DEM) were conducted to investigate the backward erosion of a multilayer sample under converging flow. The results demonstrated that the multilayer sample was eroded layer-by-layer, whereby residual layers could be observed at the bottom of the sample. The eroded regions in different layers were similar in shape but smaller in size for lower layers. In addition, particle exchange occurred among different layers during the erosion process. In general, lower-layer particles could directly ascend to upper layers in the eroded regions, whereas upper-layer particles mainly settled on the periphery of the eroded regions.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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