Due to the fact that the site condition of underground engineering was becoming more and more complex, rock mechanics face enormous challenges, such as the large deformation of confining rock, the economy of supports and the effects of permeation. In general, the problems of rock mechanics were the mechanical behaviors of fracture rock-mass in the engineering scale, especially characters of strength, deformation and failure of fracture rock-mass. In this paper, the failure evolution characteristics of intact and fracture (e.g. single fracture, parallel fractures, cross fractures and mixed fractures) coal were studied and contrasted with each other on the basis of the distribution of max-amplitude of acoustic emission (AE). And the study revealed some meaningful results, where the value of (i.e. the distribution characteristic of max-amplitude of AE) could represent the failure evolution process of intact and fractured coal. As the value of b increasing, the cracks became more difficult to enlarge. In the condition with different stress levels, the value of b tended to decrease with the load increasing, while the b value would be greater if the specimens contained more cracks with the same stress level. The deformations of fractured coal were caused by the adjustment between cracks mainly at initial loading. And when the load reached the 0.8 times of peak strength, the cracks began enlarging until the specimens destroyed. Furthermore, the characteristic that the decreases of value became gently could be regarded as the precursor criterion of the failure of intact coal and fractured coal rock-mass.

中文翻译：

---

基于声发射参数的岩体破坏演化过程研究

由于地下工程现场条件越来越复杂，岩石力学面临着围岩大变形、支护经济性和渗透效应等巨大挑战。总的来说，岩石力学问题是工程尺度上裂隙岩体的力学行为，特别是裂隙岩体的强度、变形和破坏特性。【摘要】：本文根据声发射(AE)最大振幅分布,对完整煤和裂缝(如单裂缝、平行裂缝、交叉裂缝和混合裂缝)煤的破坏演化特征进行了研究和对比。 . 该研究揭示了一些有意义的结果，其中（即 AE 最大振幅分布特征可以代表完整煤和破碎煤的破坏演化过程。随着 b 值的增加，裂纹变得更难扩大。在不同应力水平的情况下，随着载荷的增加，b 值有减小的趋势，而在相同应力水平下，如果试样中的裂纹越多，b 值就会越大。裂隙煤的变形主要是由初始加载时裂缝间的调整引起的。当载荷达到峰值强度的 0.8 倍时，裂纹开始扩大，直至试样破坏。此外，数值下降趋于平缓的特征可以作为完整煤和破碎煤岩体破坏的先兆标准。