Abstract For a better understanding of acoustic emission (AE) characteristics and failure mechanism of specimens containing hole-like flaw, a series of uniaxial compression tests are carried out by using the bonded-particle model (BPM). In the BPM, the AE simulation combined with moment tensor inversion is adopted. The results indicate that the stress drop in the stress-strain curve corresponds to a sudden increase of AE counts, which results from the propagation and coalescence of micro-cracks. The shape of hole-like flaw does not have a significant influence on the magnitude distribution of AE event. The b-value of three models is similar, i.e. 1.68, 1.83, and 1.75 corresponding to circular, square, and horseshoe flaw respectively. The forces concentration at upper and bottom of the hole-like flaw is dominated by tensile, and the fracture path only contains micro-tensile cracks. While the forces acting on lateral sides of the hole-like flaw are dominated by compressive. The fracture path contains both micro-tensile and micro-shear cracks and the failure nature is shear and compaction, although the number of micro-tensile crack is predominant.

中文翻译：

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含孔状裂纹砂岩试件单轴压缩声发射特性数值研究

摘要 为更好地了解含孔状缺陷试样的声发射(AE)特性和破坏机理，利用粘结粒子模型(BPM)进行了一系列单轴压缩试验。BPM采用AE模拟结合矩张量反演。结果表明，应力-应变曲线中的应力下降对应于 AE 计数的突然增加，这是由微裂纹的扩展和合并引起的。孔状缺陷的形状对AE事件的震级分布没有显着影响。三个模型的b值相似，即分别对应圆形、方形和马蹄形缺陷分别为1.68、1.83和1.75。孔状裂纹上部和底部的力集中以拉伸为主，且断裂路径仅包含微拉伸裂纹。而作用在孔状缺陷侧面的力则以压缩力为主。断裂路径同时包含微拉伸裂纹和微剪切裂纹，破坏性质为剪切和压实，但微拉伸裂纹的数量占主导地位。