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为分析工作面前方瓦斯和应力分布及其演化规律,以寺河矿X1301工作面为例,采用多重分形理论,研究工作面煤与瓦斯突出预测指标钻屑量S和钻屑解吸指数K1值的多重分形特征和不同孔深的特征参数Δα和Δf的变化规律。研究结果表明:煤与瓦斯突出预测指标S和K1值在较大尺度内满足标度不变形;S多重分形特征比K1值弱,两者广义分形维数均呈逐渐降低的趋势;S多重分形谱呈现左钩、右钩和钟罩等3种形状,K1值多重分形谱曲线呈现钟罩状;随钻孔深度的增加,参数Δα和Δf变化规律存在差异。
In order to analyze the distribution of gas and stress in front of working face and its evolution law, taking X1301 face of Sihe Mine as an example, the multi-fractal theory was used to study the influence of cuttings volume S and drill cuttings desorption index K1 on coal and gas outburst prediction index Multifractal characteristics and different hole depth characteristics of parameters Δα and Δf variation. The results show that the predicted values of S and K1 for coal and gas outburst satisfy the scale without deformation on a large scale; the S multifractal characteristics are weaker than the K1 value, and both generalized fractal dimensions show a decreasing trend; S multifractal The spectrum showed three shapes: left hook, right hook and bell jar. K1 multifractal spectrum showed a bell-shaped curve. With the increase of the depth of the borehole, the variation of the parameters Δα and Δf were different.