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理论分析了石门揭煤的突出机理,指出揭煤过程中能量突然释放造成的冲击是导致突出的主要根源.模拟了揭煤前的应力位移分布和揭煤过程中的演化规律.结果表明:弱圈层主要起到隔离和消波吸能的作用,阻碍揭煤过程中深部煤岩体应力影响.强圈层主要起到加固保护作用,抵抗残余地应力和瓦斯压力的影响,强弱圈层配合使用时防突效果将更好.强圈层的加固效果和强弱圈层的厚度对“强弱强”保护结构的防突效果影响显著,加固效果越好,防突效果越好,当弱圈层厚度为4 m,强圈层厚度为2 m时防突效果最好.
It is pointed out that the impact caused by the sudden release of energy in the process of exposing coal is the main cause leading to the outburst, and the distribution of stress and displacement before coal uncovering and the evolvement law during the coal uncovering are simulated.The results show that weak The stratosphere plays the role of isolation and wave absorption, which hinders the stress of deep coal and rock mass in the process of uncovering coal.The strong stratosphere mainly plays the role of reinforcement and protection against the influence of residual ground stress and gas pressure, and the strong and weak stratosphere Outburst prevention effect will be better when used together. Reinforcement effect of strong ring layer and thickness of strong and weak ring layers have significant effect on the outburst prevention effect of the “strong and weak strong” protection structure, and the better the reinforcement effect is, the better the outburst prevention effect is When the thickness of the weak circle is 4 m and the thickness of the strong circle is 2 m, the outburst prevention effect is the best.