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根据急倾斜煤层巷道放顶煤开采工艺特点,运用Griffith强度理论分析了顶煤破碎机理.通过建立Griffith裂纹受力模型,确定了顶煤断裂准则,得出了断裂拉应力与煤层的倾角、开采深度、顶煤的受力状态、裂纹的分布及发育程度等因素有关.煤层裂纹发育、倾角大于45°角,开采深度大于临界开采深度,裂隙或软弱结构面摩擦系数小是放顶煤开采的最有利条件.该结论有利于指导急倾斜煤层放顶煤开采实践.图2,表2,参6.
According to the characteristics of top coal caving mining technology in steep inclined seam roadway, the mechanism of top coal crushing is analyzed by using Griffith strength theory.By establishing Griffith crack stress model, the criterion of top coal fracture is determined, the tensile stress at fracture and coal seam dip angle are obtained, Depth, the top coal stress state, the distribution of cracks and the degree of development and other factors related to the development of coal seam cracks, dip angle greater than 45 °, mining depth greater than the critical mining depth, fissure or weak structural surface friction coefficient is the caving mining The most favorable conditions.This conclusion is helpful to guide the steep coal seam caving mining practice.Figure 2, Table 2, reference 6.