巷道底板冲击控制原理与解危技术研究

Control principle and pressure-relief technique of rock burst occurred in roadway floor

巷道底板冲击是煤矿冲击矿压多种表现形式的一种,其显现强度与破坏程度愈发严重。论文理论分析了巷道底板的冲击诱发机理,并提出底板卸压防冲原理,即通过改变巷道底板的抗弯强度以降低巷道底板冲击诱发条件。同时采用FLAC3D数值模拟,分别对底煤巷道和硬底巷道采取的卸压槽、大直径钻孔等不同措施的解危效果进行比较分析,得出底煤巷道采取卸压槽和大直径卸压钻孔相结合的复合式卸压措施防冲效果较为理想,研究成查对于硬底巷道在巷道底板实施大直径钻孔和卸压爆破的组合式解危措施效果较理想。可为巷道底板冲击防治提供一定理论依据。

The occurrence intensity and damage degree of rock burst occurred in roadway floor of un- derground coal mines becomes more serious as the mining depth increases in China. In this paper, the inducement mechanism of floor burst was analyzed, and the corresponding control principle was put forward, that is, the burst-inducing condition was decreased by changing the bending strength of road- way floor. Additionally, FLAC3~ was adopted to simulate and compare the pressure-relief effects of dif- ferent control measures implemented in coal-floor roadway and rock-floor roadway, respectively. The results show that the pressure-relief effect of the control method by combination of large-diameter borehole and pressure-releasing groove on coal-floor roadway is more effective, while the combination of large-diameter borehole and releving shot on rock-floor roadway can achieve better pressure-relief effect. The research results in this paper can provide theoretical reference for floor burst control in un- derground mining.