Deep Mining and Rockburst Research Institute, CCTEG Chinese Institute of Coal Science
School of Physics, Liaoning University, Shenyang
National Key Laboratory of Intelligent Coal Mining and Rock Formation Control

针对目前矿震诱发巷道冲击地压机制不清晰、理论研究不完善的问题,建立圆形巷道弹塑性软化力学模型,基于巷道围岩软化区能量和矿震波能量,提出矿震诱发巷道冲击地压的软化区能量极值判别准则。将软化区外边界矿震波能量与临界软化区能量之比定义为统一能量指数,并作为矿震能否诱发巷道冲击地压的判别依据,当统一能量指数小于等于1时,表明没有多余能量推动软化区煤体冲向巷道内,即矿震不会诱发巷道冲击地压;当统一能量指数大于1时,表明有多余能量迫使软化区煤体冲向巷道内,即会诱发巷道冲击地压。冲击地压发生时,用巷道快速收缩位移表征冲击地压破坏程度,且巷道快速收缩位移随着围岩临界软化区能量呈指数下降,随着软化区外边界矿震波能量呈线性上升。通过相似模拟试验和数值模拟,验证了理论分析的合理性和正确性。

Aiming at the problems of unclear mechanism and insufficient theoretical research of roadway rockburst induced by mine earthquake, an elastic-plastic softening mechanical model of roadway is estab- lished, and the softening zone energy extremum criterion of roadway rockburst induced by mine earth- quake is put forward, based on the softening zone energy and mine seismic waves energy. The ratio of mine seismic waves energy at outer boundary of softening zone to energy in critical softening zone is de- fined as the uniform energy index, which is used to judge whether mine earthquake is capable of indu- cing roadway rockburst. When the uniform energy index is less than or equal to 1, it is deficient to push the coal of softening zone into roadway, which leads to roadway rockburst. When the uniform energy in- dex is larger than 1, there is tremendous energy to force the coal of softening zone to rush into roadway. Its rockburst is induced by mine earthquake at the same time. When rockburst occurs, the degree ofrockburst damage is characterized by the roadway rapid shrinkage displacement. The roadway rapid shrinkage displacement decreases exponentially with the energy in critical softening zone of roadway sur- rounding rock, and increases linearly with seismic waves energy at outer boundary of softening zone. Theoretical analysis is verified by numerical simulation and similarity simulation test.

中国煤炭科工集团有限公司科技创新资金专项项目(2022-2-QN002);国家自然科学基金项目(52104087)