Burst failure effect of mining-induced tremor on roadway surrounding rock

作者：Cao An Ye^*; Fan Jun; Mu Zong Long; Guo Xiao Qiang

来源：Journal of China Coal Society, 2010, 35(12): 2006-2010.

• Coal mass
• Coal seams
• Consumed energy
• Dynamic stress
• Energy differences
• Energy fields
• Failure effects
• Failure mechanism
• Longwall faces
• Residual dynamics
• Roadway surrounding rock
• Seismic effect
• Seismic energy
• Static loads
• Static stress fields
• Stress drop
• Surrounding rock

The seismic energy transmission modes and attenuation rules radiated by mining-induced tremor as well as the dynamic stress drop were theoretically analyzed. Using the energy and stiffness theory of rock burst, the mechanism of rock burst induced by residual dynamic load of mining-induced tremor in the surroundings rock were further revealed. The results show that the transmission and attenuation of seismic energy mainly depends on the comprehensive influence of seismic wave geometry spreading, coal and rock media damping effort, and failure mechanism of the source. When the tremor spreads to the surrounding rocks of roadways or longwall faces, the dynamic load superposes with the original static stress field(energy field) in forms of scalar superposition of energies and vector superposition of stresses. The superposition of energies makes the aggregated energy of the coal-rock system increased, while the superposition of stresses makes the energy consumed for working decreased in the process of deformation and failure of coal mass, thus making the energy difference between aggregated and consumed energies increased. The more the energy difference released in the system, the greater the possibility of the coal mass instability. When the energy and stiffness conditions of the system are satisfied simultaneously in the composite effort of dynamic and static load, the rock burst in coal seam is happened.

• 出版日期2010
• 单位中国矿业大学（北京）