【作者】 冯龙飞； 窦林名； 王皓； 王晓东； 许刚刚； 蔡武； 焦彪；

【Author】 FENG Longfei;DOU Linming;WANG Hao;WANG Xiaodong;Xu Ganggang;CAI Wu;JIAO Biao;R&D Center of Mine Disaster Control and Environment Management Technology,Xi’an Research Institute of China Coal Technology & Engineering Group Corp;School of Mines,China University of Mining and Technology;Shaanxi Binchang Hujiahe Mining Co.,Ltd.;

【机构】 中煤科工集团西安研究院有限公司矿山灾害防治与环境治理技术研发中心； 中国矿业大学矿业工程学院； 陕西彬长胡家河矿业有限公司；

【摘要】 冲击地压矿井的临空侧采动巷道大多存在冲击危险,针对特厚综放煤层大煤柱临空侧巷道屡次冲击的工程难题,结合"两带"高度探查结果,理论概化了特厚综放煤层侧向覆岩结构,明确临空巷静载力源及控制矿压的亚关键层层位;根据采动矿压监测揭示的顶板周期性动静载特征,利用数值模拟揭示了顶板破断动载叠加多因素静载后临空侧巷道应力和能量的激增机制,并结合应力判据提出冲击机理,得出结论:临空巷侧向覆岩结构、巷道集中布置、坚硬顶板采动下沉多因素叠加构成回风巷临空侧的高静载应力环境,叠加后垂直应力峰值达到43.78 MPa,弹性能密度峰值为1.25×10~7J/m~3;坚硬顶板破断动载与多因素静载进一步叠加后,回风巷临空侧帮部垂直应力峰值为57 MPa,比纯静载作用提高了30.2%,弹性能密度峰值达到2.3×10~7 J/m~3,比纯静载作用提高了84%,动载对能量的增益作用大于应力;动静载叠加后超前工作面0～80 m范围内回风巷帮部质点垂直应力峰值均超过了50 MPa,是回风巷超前段0～70 m内屡次冲击的主要原因。基于大煤柱临空侧巷道密集区冲击机理,制订了削弱多因素静载和降低顶板破断动载的优化防治措施,保障了胡家河矿冲击地压防治体系的建立。更多还原

【Abstract】 Most of the roadway near the goaf in the mine with rock burst is in danger of impact.Aiming at the engineering problem of repeated impact of the roadway near the goaf with large coal pillar in the super thick fully mechanized top coal seam,combined with the results of "two belt" height exploration,the lateral overburden structure of the super thick fully mechanized top coal seam is theoretically generalized,and the static load source of the roadway near the goaf and the sub key layer to control the mine pressure are defined;according to the roof perimeter revealed by the mining pressure monitoring based on the characteristics of periodic dynamic and static loads,the mechanism of stress and energy surge in the roadway near the goaf is revealed by numerical simulation,and the impact mechanism is put forward by combining the stress criterion.It is concluded that the high static stress environment near the goaf is composed of the lateral overburden structure of the roadway near the goaf,the concentrated layout of the roadway,and the mining subsidence of the hard roof.The peak value of vertical stress is 43.78 MPa,and the peak value of elastic energy density is 1.25 e+7 J/m3.After the dynamic load of hard roof breaking and the static load of multiple factors are further superposed,the peak value of vertical stress of the side wall near the air return roadway is 57 MPa,which is 30.2% higher than that of pure static load,and the peak value of elastic energy density is 2.3 e+7 J/m3,which is 84% higher than the pure static load,the dynamic load has a greater energy gain than the stress;after the superposition of dynamic and static load,the vertical stress peak value of the particles in the side of the return air roadway within 0～80 m of the advance working face exceeds 50 MPa,which is the main reason for repeated impact within 0～70 m of the advance section of the return air roadway.Based on the impact mechanism of the dense area of the roadway near the air side of the large coal pillar,the optimized control measures for weakening the static load of multiple factors and reducing the dynamic load of roof breaking are formulated,which guarantees the establishment of the control system of the rockburst in Hujiahe mine更多还原