基于改进非局部模型的含预缺陷岩盘断裂破坏行为数值模拟

IF 4.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Engineering Analysis with Boundary Elements Pub Date : 2024-12-09 DOI:10.1016/j.enganabound.2024.106061

Shijun Zhao, Liang Kong, Qing Zhang, Xinbo Zhao, Wei Xu

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引用次数: 0

摘要

非均匀地质结构中裂纹扩展行为的特征描述和理解对于预测岩石类材料在不同加载条件下的力学响应至关重要。在本研究中，为了捕捉裂纹萌发的复杂性，引入了具有随机预裂 "粘结 "比特征的异质性程度的改进型周动力学（PD）模型，并探讨了具有不同预裂纹的巴西圆盘（BD）试样中的裂纹传播。获得了单一预裂纹或预裂纹系统试样的裂纹扩展路径和断裂全过程。接着，通过改进的 PD 模型研究了不同预裂纹倾斜度的 BD 试样的劈裂机理和承载能力。最后，基于非局部作用的 PD 模拟结果与实验结果在裂纹扩展和断裂模式方面进行了比较。模拟结果与实验结果十分吻合，有助于解释观察到的裂纹扩展和生长行为。模拟结果表明，改进后的 PD 模型能准确描述微裂纹的萌发、聚集、宏观裂纹的产生、扩展和断裂的全过程。这项研究为改进模拟提供了有价值的见解，为地质力学领域做出了贡献。

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Numerical simulation of fracture and breakage behaviors in rock disks containing pre-defects with an improved non-local model

The characterization and understanding of cracking propagation behaviors in non-uniform geological structures are crucial for predicting the mechanical response of rock-like materials under varying loading conditions. In this study, an improved Peridynamics (PD) model with degree of heterogeneity characterized by random pre-breaking "bond" ratio is introduced to capture the intricacies of crack initiation, and propagation in Brazilian disk (BD) specimens with different pre-cracks was explored. The crack propagation paths and the whole process of breakage of specimens with single pre-crack or pre-crack system were obtained. Next, the splitting mechanism and bearing capacity of the BD specimens with different inclinations of pre-crack were investigated through the improved PD model. Finally, the results of the PD simulations based on non-local actions were compared with the experimental ones in terms of crack propagation and breakage patterns. The simulation results are in good agreement with the experimental results, which can help explain the observed behaviors of cracking propagation and growth behaviors. The simulation results show that the improved PD model can accurately describe the whole process of micro-cracks initiation, aggregation, macro-crack generation, propagation and breakage process. This study provides valuable insights for improving simulations and contributing to the field of geomechanics.

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来源期刊

Engineering Analysis with Boundary Elements 工程技术-工程：综合

CiteScore

5.50

自引率

18.20%

发文量

368

审稿时长

56 days

期刊介绍： This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. The journal stresses the importance of these applications as well as their computational aspects, reliability and robustness. The main criteria for publication will be the originality of the work being reported, its potential usefulness and applications of the methods to new fields. In addition to regular issues, the journal publishes a series of special issues dealing with specific areas of current research. The journal has, for many years, provided a channel of communication between academics and industrial researchers working in mesh reduction methods Fields Covered: • Boundary Element Methods (BEM) • Mesh Reduction Methods (MRM) • Meshless Methods • Integral Equations • Applications of BEM/MRM in Engineering • Numerical Methods related to BEM/MRM • Computational Techniques • Combination of Different Methods • Advanced Formulations.