Study on the microstructural evolution of gangue cemented backfill under uniaxial compression

IF 2.8 3区工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

Computational Particle Mechanics Pub Date : 2024-10-05 DOI:10.1007/s40571-024-00821-z

Dongmei Huang, Xin Pan, Xikun Chang, Shuyu Qiao, Daqian Xing, Xinzhao Wang

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引用次数: 0

Abstract

In cemented paste backfill (CPB), the connection mode and spatial position arrangement of particles determine the deformation, structural strength and stability of the backfill. Based on the scanning electron microscope images of CPB, the representative elementary area (REA) of the pore structure of CPB is obtained. The actual microstructure of CPB in PFC^2D according to REA was modeled, and the microscopic parameters of the model based on the results of indoor uniaxial compression tests were calibrated. Finally, by studying the microstructure, mechanical properties, force chain, normal contact force, tangential contact force and coordination number of CPB with different curing time (3 days, 7 days, 28 days), the internal relationship between mesoscopic parameters and macroscopic mechanical properties during CPB development was analyzed. Exploring the changes of mesostructure during the development of CPB is of great significance to the study of heterogeneous structure and multi-scale mechanical theory system.

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单轴压缩下矸石胶结充填体微观结构演化研究

在胶结膏体充填体中，颗粒的连接方式和空间位置排列决定了充填体的变形、结构强度和稳定性。基于CPB的扫描电镜图像，得到了CPB孔隙结构的代表性基本面积（REA）。根据REA对PFC2D中CPB的实际微观结构进行了建模，并基于室内单轴压缩试验结果对模型的微观参数进行了标定。最后，通过研究不同养护时间（3天、7天、28天）CPB的微观结构、力学性能、力链、法向接触力、切向接触力和配位数，分析CPB发育过程中细观参数与宏观力学性能之间的内在关系。探索CPB发展过程中细观结构的变化对研究非均质结构和多尺度力学理论体系具有重要意义。

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来源期刊

Computational Particle Mechanics Mathematics-Computational Mathematics

CiteScore

5.70

自引率

9.10%

发文量

期刊介绍： GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate ﬂows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.