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- W2079366372 abstract "The experiences of underground coal mining in China show that coal in a thick hard coal seam with a hard roof, the so-called “double hard coal seam”, is difficult to be excavated by top-coal caving technique. In order to solve the problem, a top-coal weakening technique is proposed in this paper. In the present study, fractal geometry provides a new description of the fracture mechanism for blasting. By means of theoretical analysis of the relationship between the fractal dimension of blasting fragments and the dynamite specific energy, a mechanical model for describing the size distribution of top-coal and the dissipation of blasting energy is proposed. The theoretical results are in agreement with laboratory and in situ test results. Moreover, it is shown that the fractal dimension of coal fragments can be used as an index for optimizing the blasting parameters for a top-coal weakening technique." @default.
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- W2079366372 date "2008-05-01" @default.
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- W2079366372 title "Application of fractal theory to top-coal caving" @default.
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- W2079366372 doi "https://doi.org/10.1016/j.chaos.2006.07.024" @default.
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