基于晶粒的离散虚拟内结合（GB-DVIB）模型，用于模拟粒状岩石的微裂缝

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-01 DOI:10.1615/intjmultcompeng.2024052740

Yuezong Yang, Yujie Wang, Zihan LIU

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引用次数: 0

摘要

岩石的中观结构从根本上影响其宏观力学行为。在离散化虚拟内结合（DVIB）模型的基础上，建立了基于晶粒的 DVIB（GB-DVIB）模型，以研究增益尺度的微裂缝过程。在 DVIB 框架内提出了一种粒状岩石中观结构生成方法。通过这种方法，可以方便地生成矿物晶粒、晶界和空隙。根据 DVIB 中宏观参数和微观参数之间的关系，可以利用实验获得的中观结构力学参数直接标定微观结合参数。研究了介观结构力学参数、晶粒尺寸和孔隙率对宏观力学行为的影响，为 GB-DVIB 的应用提供了有价值的参考。该方法可再现晶内和晶间裂纹。模拟了花岗岩样品的三点弯曲试验和非对称抗压试验。模拟的微观裂纹过程和宏观失效模式与实验观察结果一致。GB-DVIB 为研究粒状岩石的增益尺度微裂缝过程提供了一个方便有效的工具。

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A grain-based discretized virtual internal bond (GB-DVIB) model for modeling micro-cracking of granular rock

The meso-structure of rock essentially affects its macroscopic mechanical behaviors. Based on the discretized virtual internal bond (DVIB) model, a grain-based DVIB (GB-DVIB) model is developed to investigate the gain-scale micro-cracking process. A meso-structure generation method for granular rock is proposed within the framework of DVIB. By this method, mineral grains, grain-boundaries and voids can be generated conveniently. Based on the relationship between macro and micro-parameters in DVIB, the mechanical parameters of meso-structure obtained by experiments can be employed to calibrate the micro-bond parameters directly. The effect of mechanical parameters of meso-structure, grain size and porosity on the macroscopic mechanical behavior is investigated, which provides a valuable reference for the application of GB-DVIB. The intra-granular and inter-granular cracks both can be reproduced by the method. A three-point bending test and an asymmetric compressive test of granite samples are simulated. The simulated micro-cracking process and macro-failure pattern are consistent with the experimental observation. The GB-DVIB provide a convenient and effective tool for researching the gain-scale micro-cracking process of granular rock.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.