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理论比较分析煤岩在剪切、拉伸等破裂模式下的应力降、应变能释放及震动能量辐射特征,揭示采动煤岩不同破裂模式下的冲击危险差异.研究表明,煤岩破裂失稳释放的应变能随其破裂尺度的增大而增大,且在相同破裂尺度下,煤岩剪切破裂释放的能量和产生的应力降远大于在拉伸破裂下的能量释放和应力降大小.在能量释放相同时,震源破裂尺度随其单轴抗压强度的增大而减小.同时,不同采动煤岩矿震因震源矩张量成分的差异,其震动位移场及能量辐射方式也不尽相同.煤岩拉伸破裂的微震波形往往P波初动清晰,S,P波的能量比(振幅比)较小,而剪切破断则表现出P波初动微弱,S,P波的能量比(或振幅比)较大的微震特征.
The theory compares and analyzes the stress drop, strain energy release and vibrational energy radiation characteristics of coal and rock under the modes of shearing, stretching and other rupture, revealing the difference of impact hazard under different rupture modes of mining coal and rocks.The research shows that the rupture of rock and coal The strain energy released increases with the increase of rupture scale. And at the same rupture scale, the energy released by shear failure of coal rock and the stress drop caused by rupture are much larger than the energy release and stress drop drop under tensile rupture. At the same energy release, the rupture scale decreases with the increase of uniaxial compressive strength.At the same time, the differences of seismic moment tensor components in different mining coal and rock mines, the vibration displacement field and the energy radiation way The amplitude of the energy ratio (amplitude ratio) of S and P waves is small, while the shear breaking shows that P wave has a weak first move and the S and P waves The energy ratio (or amplitude ratio) larger microseismic features.