掘进巷道防冲卸压方案优化研究

Research on Rockburst Prevention and Pressure Relief Scheme Optimization of Heading Roadway

为了研究提高防冲卸压效果的方法、不同应力等级区防冲卸压力度的合理分配问题,建立了有普遍适用性的高低应力区划分判别式,并针对高低应力区分别制定卸压试验。研究分析表明:高应力区仅实施1轮大直径钻孔卸压效果有限,高应力区卸压力度应当是低应力区的3倍;增加单个钻孔钻屑量能够增大钻孔周围破碎区半径,进而提高卸压效果,卸压过程中可以适当采取措施增加煤体震动、增加钻屑量;卸压后,煤体中应力积聚较快,应当实行间隔一定时间多轮卸压。

In order to study the improvement method of rockburst prevention and pressure relief effect,as well as the allocation problem of rockburst prevention and pressure relief level in high and low stressed zones,we established a universal applicability division discriminant and carried out a series of experiments for the high and low stressed zones respectively. The experimental results and theoretical analysis indicate that the effect is limited to use large diameter borehole drilling of just single round in high stressd zones,and its strength should be 3 times as high as the low stressed zones. The increase of single hole drilling cuttings weight can increase the broken zone radius of the hole and then enhance the pressure relief effect,we can take appropriate measures to increase coal mass vibration and increase the amount of drilling in the process of pressure relief. The effect of interval time for several rounds is better,due to stress accumulated rapidly in the coal after pressure relief.