深部残采区域下冲击危险易突出煤层开采的相似模拟试验

摘要

For the safety problem on mining underlying coal seam workface of deep residual area,similar simulation test was adopted to analyze the rule of the stress variation by monitoring coal stress in the formation process and stable state of residual area.Stress-relief angles and protection scope on the dip and strike were ascertained based on the protection rule of stress-relief.The result shows that the overlying strata movement experienced twice instantaneous instability in large and five stages such as ＂normal—severe—ease—severe—normal＂ during the mining process of underlying coal seam workface.And transportation lane is in the high stress concentration region.There are two dangerous areas on the strike direction of workface.The scope of two dangerous areas was delimited combined with stress observation data.Simulation results also provide valuable primary data for formulating prevention measures of rock burst or coal and gas outburst in deep residual area.%针对深部残采区域下伏煤层工作面的安全开采问题,采用相似模拟试验的方法,通过监测残采区域形成过程中及稳定后下伏煤层应力变化情况,分析应力变化规律,根据应力卸压准则确定了残采区域的走向和倾向的卸压角及保护范围。试验结果表明,残采区域下伏煤层工作面开采过程中上覆岩层运动经历了＂正常—剧烈—缓和—剧烈—正常＂5个阶段和2次瞬时大面积整体失稳,工作面进风巷位于高应力集中区域内;在工作面走向方向上存在2处危险区域,结合应力观测数据划定了2处危险区域的范围。该研究工作为制定残采区域下伏煤层工作面防冲、防突安全措施提供了可靠的基础数据。