Multi-fractal characteristics of surface potential of coal during the fracture

作者：Liu, Jie^*; Wang, En-Yuan; Li, Zhong-Hui; Ma, Yan-Kun

来源：Journal of China Coal Society, 2013, 38(9): 1616-1620.

• Characteristic parameter
• Deformation and fracture
• Different sizes
• Failure mechanism
• Loading process
• Multi-fractal spectrum
• Scale invariance
• Uni-axial compression

In order to analyze the failure mechanism of coal under the load, multi-fractal characteristics of surface potential of coal sample under uniaxial compression was studied. The surface potential was analyzed using multi-fractal theory to calculate the multi-fractal spectrum. The change rules of characteristic parameters of multi-fractal spectrum with the loading process were studied. The results show that the surface potential represents multi-fractal feature, and keeps scale invariance in the wide range. The shape of the multi-fractal spectrum of different size specimens shows right hook. The characteristic parameters of multi-fractal spectrum, Δα and Δf, vary with the process of deformation and fracture of coal sample with load. The changes of trend that Δα and Δf increase in a long time, then decrease rapidly can be used as a precursory factor of coal-rock failure to forecast the instability of the samples. The results are helpful to understand the inherent law in the coal specimen failure process and forecast the dynamic disaster using the potential.

• 出版日期2013
• 单位安徽大学; 中国矿业大学（北京）