大采高开采高位关键层运动致灾机理研究

Study on The Mechanism of Disaster Caused by Movement of High Position Key Stratum in Large Mining Height Coal Mine

大采高工作面采场强矿压灾害与上覆高位关键层的赋存状态及破断运动密切相关。研究与实践表明:特厚煤层综放开采或特大采高综采工作面顶板高位关键层横“O-X”破断、竖“O-X”破断以及悬而未断都将显著影响采场矿压,导致工作面易出现强矿压灾害或冲击地压灾害等动力现象。结合部分工程案例,阐述了大采高开采高位关键层在不同破断形式或悬而未断条件下的致灾机制,并提出了高位关键层致灾防控技术,为西部类似大采高开采条件下的工作面安全高效开采提供借鉴。

Strong ground pressure hazards at large mining height working faces are closely related to the overlying high position key stratum structural form and collapse movement. The horizontal "O-X" fracture, vertical "O-X" fracture, and hanging not collapse of the high position key stratum will significantly affect the mine pressure in extra thick seams or extra high full-mechanized caving mining. They easily result in a strong ground pressure hazard at the working face and a rock burst accident. Combines some engineering cases to illustrate the disaster-causing mechanisms of high-position key stratum in large mining height working faces under different forms of fracture or suspended but unbroken conditions. And proposes disaster prevention and control techniques for high position key stratum, which can provide a reference for the safe and efficient mining of working faces in similar large mining height conditions in the west.