The application of the acoustic emission (AE) and damage theory to the evaluation of coal rock stability requires a clear comprehension of the influence of joints. The mechanical and AE response characteristics and damage evolution characteristics of samples with different joint angles were analysed through uniaxial compression tests. The results show that the angle between the loading principal stress and joint surface considerably influences the mechanical characteristics of samples and the damage degree characterised by the AE. However, the existing models of AE damage characterisation do not fully reflect the damage characteristics of samples with different loading principal stresses and joint surface angles. In this paper, the improved damage model characterised by the AE count accumulation is proposed. The model has clear physical and mechanical bases and can effectively characterise the damage catastrophe characteristics of the samples with different joint angles. It also has an important application value in coal and rock dynamic disaster monitoring and early warning, damage detection and other projects.

中文翻译：

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不同节理角煤样的破坏断裂规律及其声发射特征

声发射（AE）和损伤理论在煤岩稳定性评估中的应用要求清楚地了解节理的影响。通过单轴压缩试验分析了不同接角的样品的力学和声响应特性及损伤演化特征。结果表明，加载主应力与接缝表面之间的夹角对样品的力学性能和AE表征的损伤程度有很大影响。但是，现有的AE损伤表征模型不能完全反映具有不同载荷主应力和接头表面角度的样品的损伤特征。本文提出了一种以声发射计数累积为特征的改进损伤模型。该模型具有清晰的物理和机械基础，可以有效地表征具有不同接合角的样品的破坏突变特性。在煤岩动态灾害监测预警，破坏检测等项目中也具有重要的应用价值。