为了确定冲击地压矿井回采工作面合理的回采速度，通过分析冲击地压监测数据、冲击显现与工作面回采速度关联性，研究工作面见方效应、顶板预裂爆破、小煤柱护巷工艺、保护层开采等对工作面回采速度的影响，探索工作面在实际生产中合理推采速度的确定方法。结果表明：冲击地压矿井合理回采速度的确定需要坚持“一矿一策、一面一策”的基本原则；在工作面见方等强冲击危险区域可依据实际监测数据及动力显现分析结果，选择动载扰动最小的回采速度作为安全回采速度；顶板预裂爆破、小煤柱护巷工艺、保护层开采等措施有利于降低工作面动载诱冲风险，在确保防治措施效果，加强实时监测与分析的同时可适当提高回采速度；但即使采取多种防治措施，仍需注意对回采速度的合理管控，最大回采速度不宜超过本矿井存在动力显现、冲击地压事故回采工作面的安全回采速度；工作面短期停产与复采期间，微震事件恢复平稳存在一定滞后性，因此，应重视工作面短期停产、复采期间动力显现风险。

In order to determine the reasonable mining speed of the working face in rockburst mine, through the analysis of monitoring data of rockburst, the correlation between impact appearance and the mining speed of working face, the influence of square effect of working face, roof pre-splitting blasting, small coal pillar roadway protection technology and protective seam mining on mining speed of working face were studied to explore the method of determining the reasonable mining speed of the working face in actual production.The results show that: the determination of reasonable mining speed in rockburst mines needs to adhere to the basic principle of “one mineone policy, one face one policy”; in areas with strong shock hazards such as squares at the working face, the mining speed with the minimum dynamic load disturbance can be selected as the safe mining speed according to the actual monitoring data and dynamic behavior analysis results; measures such as roof pre-splitting blasting, small coal pillar roadway protection technology and protective seam mining are conducive to reduce the risk of dynamic load induced erosion in the working face. While ensuring the effect of prevention measures and strengthening real-time monitoring and analysis, the mining speed can be appropriately improved.However, even after taking a variety of prevention measures, it is still necessary to pay attention to the reasonable control of the mining speed, and the maximum mining speed should not exceed the safe mining of the working face with dynamic appearance and rockburst accidents in the mine. During the short-term shutdown and re-mining of the working face, there is a certain lag in the recovery of microseismic events, so we should pay attention to the risk of dynamic appearance during the period of short-term stoppage and re-mining.

0 引言

1 工程概况

2 回采速度与见方效应关联性分析

   2.1 31103-1工作面见方效应分析

   2.2 工作面不同回采区段回采速度与微震事件关联性分析

3 防治措施对回采速度的影响

   3.1 顶板预裂爆破对回采速度的影响

   3.2 小煤柱护巷对回采速度的影响

   3.3 保护层对回采速度的影响

4 工作面启停微震滞后性

5 结论