The study of rock damage evolution is of great significance in the field of underground engineering. In this paper, the damage development of deep formation rock was quantitatively evaluated by acoustic emission (AE) test. The Young’s modulus of the test rock specimens under ideal intact state was obtained by assuming a linear relationship between the AE rate parameter and the damage variation based on the rate process theory. Through the multi-stage cyclic loading test, the damage parameters corresponding to the peak stress of the previous stage were calculated by using the tangent modulus at the initial moment. The results showed that there was abrupt transition stage of damage development with the linear increase of stress. The damage parameter curves of rock specimens during loading process were obtained by using the method of cumulative AE energy, and the development trend of the curves was analyzed simply by combining the concepts of crack initiation stress and crack damage stress. Comparing the two methods of obtaining damage parameters by using cyclic loading test and cumulative AE energy, the results of them were highly consistent except for some deviation in the initial and final stages.

中文翻译：

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基于声发射试验的深部岩石损伤演化研究

岩石损伤演化研究在地下工程领域具有重要意义。本文采用声发射(AE)试验定量评价深部岩石的损伤发展。基于速率过程理论，假设声发射速率参数与损伤变化呈线性关系，得到理想完整状态下试验岩石试样的杨氏模量。通过多阶段循环加载试验，利用初始时刻的切线模量计算出前一阶段峰值应力对应的损伤参数。结果表明，随着应力的线性增加，损伤发展出现突变过渡阶段。采用累积声发射能量法得到岩石试样加载过程中的损伤参数曲线，并结合裂纹萌生应力和裂纹损伤应力的概念简单分析了曲线的发展趋势。通过循环加载试验和累积AE能量获得损伤参数的两种方法进行比较，除了初始和最终阶段存在一些偏差外，它们的结果高度一致。