Evolution characteristics of calcareous sand force chain based on particle breakage

IF 5.8 4区 工程技术 Q1 MECHANICS Applied Rheology Pub Date : 2024-07-30 DOI:10.1515/arh-2024-0009
Bin Chen, Junjie Xia, Yiwei Lu, Geping Zhang, Qinghua Liu, Jieming Hu, Zijian Han
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Abstract

Calcareous sand is easily broken under external force, which brings great difficulties to island reef engineering. Based on the particle flow program, a discrete element model that can reproduce the results of laboratory tests is established, the large principal stress method is introduced to identify the particle force chain, and the bond strength between particles is increased to obtain an unbreakable model with the same initial conditions, and different confining pressures are compared and analyzed. The evolution law of the force chain of the following two models establishes a macro-meso cross-scale analysis in the deformation process of calcareous sand, explores the internal mechanism of the crushing of calcareous sand particles. The results show that particle breakage plays an important role in the evolution of the force chain. Particle breakage will reduce the probability of the force chain on both sides of the axis, forcing the probability of the axial force chain to rise steadily. The macroscopic deviatoric stress is the external manifestation of the probability of the axial force chain on the meso level. The faster the probability of the force chain in the direction of the potential shear band increases, the more obvious the shear band is.
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基于颗粒破碎的钙质砂力链演变特征
钙质砂在外力作用下容易破碎,给岛礁工程带来很大困难。在颗粒流动程序的基础上,建立了能再现实验室试验结果的离散元模型,引入大主应力法识别颗粒力链,提高颗粒间的结合强度,得到了相同初始条件下的不可破模型,并对不同的约束压力进行了对比分析。以下两个模型的力链演化规律建立了钙质砂变形过程中的宏观-中观跨尺度分析,探索了钙质砂颗粒破碎的内在机理。结果表明,颗粒破碎在力链的演化过程中起着重要作用。颗粒破碎会降低轴两侧力链的概率,迫使轴向力链的概率稳步上升。宏观偏差应力是轴向力链概率在中观层面的外在表现。潜在剪切带方向上的力链概率增加得越快,剪切带就越明显。
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来源期刊
Applied Rheology
Applied Rheology 物理-力学
CiteScore
3.00
自引率
5.60%
发文量
7
审稿时长
>12 weeks
期刊介绍: Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.
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