不同组合方式煤岩组合体强度及声发射特征分析

Analysis of Strength and Acoustic Emission Characteristics of Coal and Rock Mass in Different Combinations

为研究不同高度比的煤岩组合体在不同组合方式下力学特性和声发射特征,利用RFPA2D数值模拟软件对煤岩组合体进行模拟研究。试验结果表明:组合体的单轴抗压强度随煤样在组合体中占比的增大而减小;岩样与煤样的高度比对声发射能量产生显著影响,组合体中岩样高度所占比例越高,声发射信号越强,其产生的声发射能量也越多;在煤岩高度比相同的情况下,不同的组合方式也会对强度产生影响,组合体强度由大到小的组合方式依次为煤-岩、岩-煤、岩-煤-岩;此外,通过组合体声发射特征分析可知,组合体产生的声发射能量与其抗压强度的大小成正比,即抗压强度越大其产生的声发射能量也越大。

To study the mechanical properties and acoustic emission characteristics of coal and rock mass with different height ratios under different compound modes, RFPA2 Dnumerical simulation software was used to conduct the simulation researches for coal and rock mass. Results showed that the uniaxial compressive strength of the combination decreased with the increase of the ratio of the coal block in the combination, and the height ratio of rock to coal had a significant effect on acoustic emission energy.The higher the ratio of rock height in the coal-rock combination, the stronger the acoustic emission signals become, and the more acoustic emission energy it generated;the different combination of coal and rock would also affect the intensity when the coal-rock height ratio was the same, and the intensity of combination indicated the combinations of coal-rock, rock-coal, and rock-coal-rock in descending order. The analysis of the acoustic emission of the combination showed that the acoustic emission energy produced by the combination is proportional to the compressive strength. That is to say, the greater the compressive strength was,the more acoustic emission energy was produced.