岩石压剪断裂过程中的超声波波谱特性研究

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。

STUDY ON THE CHARACTERISTICS OF ULTRASONIC WAVE SPECTUM IN CRACKED ROCK SPECIMEN ON COMPRESSIVE-SHEAR LOADING

The acoustic emission (AE) behavior in the process of rock fracture is not only closely related to the rock types but also to the load and microfracture progress. Thus, AE wave spectrum obtained from loaded rock specimen contains a great amount of information concerning microfracture of rock.The microfracture mechanism of rock under compressive-shear loading is studied using wave-spectrum analysis in this paper. the relation between wave-specturm behavior at different loading stages and mechanical response of rock and critical crack propagation is discussed. The results show that wave-spectrum parameters are more sensitive to microfracture of rock than to load itself, which is quite significant for solving engineering problems, such as safty estimation and rock burst prediction in mining process and slope stability analysis in geological engineering.