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岩石破裂过程中的声发射特性不仅与岩石种类有关 ,而且与受到的载荷和破裂进展密切相关 ,岩石受载时的声发射波谱中含有大量与微断裂有关的信息。本文通过岩石压剪加载时峰值前的声发射波谱特性分析 ,探讨了岩石压剪时的微断裂机理 ,揭示了岩石在压剪加载不同阶段的波谱特性与岩石初始非线性、线性响应和临界裂纹扩展之间的相关关系。实验结果表明 ,声发射波谱参数的变化对岩石微断裂进展的响应比载荷本身更为敏感。这一结论为岩石边坡稳定性分析 ,岩爆预测和采矿工程的安全性评估提供了十分有意义的实验依据。
Acoustic emission characteristics during rock failure are not only related to rock types, but also closely related to the progress of loads and fractures. Acoustic emission spectra of rocks contain a large amount of information related to micro-faults. In this paper, the micro-fracture mechanism of rock under the pressure-shear condition is discussed by analyzing the characteristics of acoustic emission spectra before the peak pressure at rock-shear loading. The spectral characteristics of rock under different stages of pressure-shear loading and the initial nonlinear, linear response and critical crack Expansion of the correlation between. The experimental results show that the change of AE parameters is more sensitive to the progress of micro-faults than the load itself. This conclusion provides a very meaningful experimental basis for rock slope stability analysis, rockburst prediction and safety assessment of mining engineering.