CAJ | 학술논문

通过建立特厚近直立煤层开采中上覆煤柱的力学模型与数值模型，分析了上覆煤柱及其围岩的力学状态，得出上覆残留煤柱的存在对冲击地压有明显影响，其诱发冲击地压的机制为在高水平应力作用下，在煤柱边缘形成剪切区，剪切区的煤岩层存在应力集中并积聚了大量的弹性能，容易失稳诱发冲击地压。通过分析高能量微震事件的分布规律及冲击显现的震源定位，验证了煤柱诱发冲击地压的机制。针对这一诱发机制，对剪切区应用岩层注水及煤岩深孔爆破措施，有效地降低煤柱剪切区的应力集中程度，使煤岩层平稳地释放弹性能，降低了冲击危险性。
통과건립특후근직립매층개채중상복매주적역학모형여수치모형，분석료상복매주급기위암적역학상태，득출상복잔류매주적존재대충격지압유명현영향，기유발충격지압적궤제위재고수평응력작용하，재매주변연형성전절구，전절구적매암층존재응력집중병적취료대량적탄성능，용역실은유발충격지압。통과분석고능량미진사건적분포규률급충격현현적진원정위，험증료매주유발충격지압적궤제。침대저일유발궤제，대전절구응용암층주수급매암심공폭파조시，유효지강저매주전절구적응력집중정도，사매암층평은지석방탄성능，강저료충격위험성。
By setting up mechanics and numerical simulation model of overlying coal-pillar in extremely-thick and sub-erect coalseam, stress distribution of coal-pillar and surrounding rock was analyzed. It was obtained that rock-burst was influenced obviously by overlying coal-pillar. Rock-burst inducing mechanism was that under high horizontal stress, shear stress and elastic energy concentration zone formed at the edge of coal-pillar which was easy to result into rock-burst. Micro-seismic matters distribution and seismic source location result proved the mechanism of rock-burst induced by coal-pillar. On the basis of this, applying water injection and deep bore-hole blasting in rock and coal in shear stress zone, stress concentration degree was reduced effectively and elastic energy of coal and rock was released steadily, which reduced rock-burst danger.