Study on induced mechanism of rock bursts by fracture movement of hard magmatic beds
LIU Shaohong1，2，PAN Junfeng1，2，XIA Yongxue1，2
(1. Coal Mining and Designing Branch，China Coal Research Institute，Beijing 100013，China；2. Coal Mining and Designing Department，Tiandi Science and Technology Co.，Ltd.，Beijing 100013，China)
Abstract：Aiming at the practical problem of frequent rock burst in deep mining after large area goaf in shallow coal seam under huge thick hard magmatic rock beds，the induced mechanism of rock bursts by the fracture movement of magmatic beds was studied based on theoretical analysis，numerical simulation，field measurement and engineering practice. A triangular cantilever beam model of the hard magmatic rock roof above the large area goaf was established，and stress and energy characteristics of the roof were analyzed theoretically. A criterion for the fracture movement of the magmatic rock roof was proposed，and a mechanical model for rock bursts induced by the fracture movement of the roof was established. By considering the surface cracking and underground appearance，the large area overhanging of the hard magmatic rock roof above the shallow goaf and the local strong intrusion zone constitute the static action，and the extrusion of the magmatic rock roof“Rotary”movement and the mining disturbance of the working face constitute the dynamic action. The dynamic action plays a dominant role in rock burst induced by magmatic rock roof during deep coal mining. Analysis of field microseismic monitoring data indicates that the dynamic and static loads，resulted from the fracture movement of the hard magmatic rock roof，are the key factors inducing rock bursts. From two aspects of improving the anti-seismic ability of the roadway itself and keeping the high-energy micro-earthquake event away from the roadway，measures of deep-hole blasting at the floor and strengthening support were put forward，which were proven effective through practices
刘少虹1，2，潘俊锋1，2，夏永学1，2. 巨厚坚硬岩浆岩床破裂运动诱发冲击地压机制研究[J]. 岩石力学与工程学报, 2019, 38(3): 499-510.
LIU Shaohong1，2，PAN Junfeng1，2，XIA Yongxue1，2. Study on induced mechanism of rock bursts by fracture movement of hard magmatic beds. , 2019, 38(3): 499-510.
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2019, Vol. 38 
