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在MTS815.02岩石力学试验系统上进行了煤的单轴压缩、三轴压缩及孔隙水作用下全应力应变试验及声发射检测.结果表明:煤的三轴强度、残余强度随围压增高而增大,随孔隙水压增高而降低;在低围压试验范围内,煤的弹性模量不随围压变化.煤在不同试验条件下呈现的声发射特征有显著差异性:单轴试验时各个阶段均有声发射事件产生,三轴及孔隙水试验条件下煤样屈服之前声发射事件较少,而屈服之后声发射趋于活跃;单轴试验时煤的声发射能量最大,随孔隙水压增大,煤样变形过程释放的声发射能量逐渐减小.
Uniaxial compression, triaxial compression and pore-water stress-strain tests and acoustic emission measurements were carried out on MTS815.02 rock mechanics test system.The results show that the triaxial strength and residual strength of coal increase with the increase of confining pressure And decreases with the increase of pore water pressure.The elastic modulus of coal does not change with the confining pressure in the range of low confining pressure test.The characteristics of acoustic emission exhibited by coal under different experimental conditions are significantly different: Acoustic emission events occurred during the three stages, and the acoustic emission events were less before yielding and the acoustic emission tended to be more active after triaxial and pore water tests. The acoustic emission energy of coal was the largest during uniaxial tests. With the increase of pore water pressure Large, coal sample deformation process of acoustic emission energy is gradually reduced.