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针对单纯以煤层或顶板岩层进行煤层冲击倾向性判定存在“低估”问题,采用RFPA2D模拟软件开展不同高度比和不同顶板强度、厚度、均质性及接触面角度下组合煤岩结构体的冲击倾向性数值试验.研究结果表明:组合煤岩结构体冲击倾向性高于纯煤层或岩层测定结果,更接近实际.随着顶板强度、厚度、均质性的增加,组合煤岩结构体冲击倾向性增强,随接触面角度的增大,其单轴抗压强度降低,峰后塑性变形阶段越来越明显.在接触面角度一定的情况下,随着顶板岩体强度的增加,组合煤岩结构体冲击破坏声发射累计释放能量减弱.
Aiming at the problem of “propensity” of judging the coal seam impact simply by coal seam or roof rock strata, RFPA2D simulation software was used to carry out the experiment of coal seam structure with different height ratio and different roof strength, thickness, homogeneity and contact angle Impact propensity numerical test.The results show that the impact tendency of the composite coal and rock structure is higher than that of pure coal or rock formation, which is closer to reality.With the increase of roof strength, thickness and homogeneity, the impact of combined coal and rock structure With the increase of the contact angle, the uniaxial compressive strength decreases and the post-peak plastic deformation phase becomes more and more obvious.With the increase of the strength of roof rock mass, Impact damage of rock structure Acoustic emission cumulative release energy weakened.