Pore is a common type of microdefect or flaw in rock or rock‐like material. Predicting the influence of pore‐like flaw on the deformation, strength, and failure behavior of a brittle material is a topic of great interest in the field of geomechanics and geotechnical engineering. In this study, the influences of a group of two‐dimensional circular pore‐like flaws with varied number, position, and size on the strength and deformation behavior and the associated microcracking process of crystalline rock is numerically investigated by using a grain‐based modeling approach. The results reveal that the simulated strength and deformation properties, and the temporal and spatial microcracking process are significantly influenced by the aggregation of a group of pore‐like flaws in the model. Due to local stress amplification, the uniaxial compressive strength (UCS) and elastic modulus are found to decrease as the pore number (ie, porosity) gradually increases in the model. The microcracks mostly initiate at the top and bottom of the pore‐like flaws, and tension zones generally form around these assembled pores in the loading direction. The stress magnitude in the model, which generally decreases with the increase of porosity in the model, is obtained and quantitatively analyzed. As compared with regularly assembled pores, randomly distributed pores are found to cause much more uniformly distributed stress and smaller tension zone in numerical models. The position of pore‐like flaws has been shown to have a negligible influence on the strength and deformation behavior, while the simulated UCS is found to progressively increase with increasing radius of the pore‐like flaw.

中文翻译：

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孔状缺陷对结晶岩强度和微裂纹行为的影响

孔隙是岩石或类岩石材料中常见的微缺陷或缺陷类型。预测孔状缺陷对脆性材料的变形，强度和破坏行为的影响是岩土力学和岩土工程领域的一个重要课题。在这项研究中，使用基于颗粒的模型，数值研究了一组二维，数量，位置和大小各异的圆形圆孔状缺陷对强度和变形行为以及相关的微裂纹过程的影响。方法。结果表明，模拟的强度和变形特性以及时空微裂纹过程受到模型中一组孔隙状缺陷的聚集的显着影响。由于局部压力放大，随着模型中孔隙数（即孔隙度）的逐渐增加，单轴抗压强度（UCS）和弹性模量降低。微裂纹主要始于孔状裂纹的顶部和底部，通常在加载方向上围绕这些组装的孔形成张力区。获得并定量分析模型中的应力大小（通常随模型中孔隙率的增加而减小）。与规则组装的孔相比，在数值模型中发现随机分布的孔会导致应力分布更加均匀并且张力区域更小。孔状缺陷的位置对强度和变形行为的影响可忽略不计，