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为了探究含瓦斯煤变形破坏过程中的能量演化规律,理论推导了恒定围压下含瓦斯煤样压缩变形时的能量计算公式.针对平顶山矿区八矿己15-14120工作面瓦斯突出煤体进行了4组不同瓦斯压力下的压缩破坏试验,得到了能量输入密度、弹性能密度和耗散能密度的演化规律.结果表明:1)含瓦斯煤三轴压缩变形破坏过程中,轴压方向能量吸收,围压方向能量释放,瓦斯压力做功与体应变有关.2)煤样达到峰值之前,能量输入密度、弹性能储存密度、能量耗散密度都随着轴向应力的增大而增大,吸收能密度最快,弹性能密度次之,耗散能密度增加缓慢;峰值过后,能量输入密度继续上升,弹性能密度下降,耗散能密度激增.3)基于声发射的能量释放规律与应力-应变曲线有很好的对应,瓦斯压力越大,相对于轴向应变的能量耗散来期越早,同时耗散速率也越快.4)随着瓦斯压力的提高,煤体变形声发射信号初始点、体积膨胀点、峰值应力点处的吸收能密度、弹性能密度降低,耗散能密度增大.
In order to explore the law of energy evolution in the process of deformation and destruction of gas coal, the formula for calculating the energy of compressive deformation of gas-bearing coal under constant confining pressure was derived theoretically. The results show that: 1) During the process of triaxial compression deformation and failure, the axial energy absorption in the axial direction , Energy release in the direction of confining pressure and gas pressure are related to the body strain.2) Before the peak of coal sample is reached, the energy input density, elastic energy storage density and energy dissipation density increase with the increase of axial stress, The density of elastic energy decreases and the density of dissipative energy increases sharply.3) The law of energy release based on acoustic emission and the stress- Strain curve has a good correspondence, the greater the gas pressure, the energy dissipation relative to the axial strain to the earlier period, while the dissipation rate is faster .4) With the increase of gas pressure, coal Shaped initial AE signal point, the volume expansion point, the absorbed energy density at the point of peak stress, elastic energy density decreases, dissipated energy density is increased.