Abstract
Using UDEC discrete element numerical simulation software and a cosine wave as vibration source, the whole process of rockburst failure and the propagation and attenuation characteristics of shock wave in coal-rock medium were investigated in detail based on the geological and mining conditions of 1111(1) working face at Zhuji coal mine. Simultaneously, by changing the thickness and strength of immediate roof overlying the mining coal seam, the whole process of rockburst failure of roadway and the attenuation properties of shock wave were understood clearly. The presented conclusions can provide some important references to prevent and control rockburst hazards triggered by shock wave interferences in deep coal mines.
Highlights
Coal mining is closely related to blasting, transportation, mechanical operation, and other activities; the whole process of mining is accompanied with the generation and interference of shock wave
Part of the energy will be released in the form of shock waves, which can generate dynamic impact on the surrounding coal and rock medium
The purpose of our research is to provide the certain basis and reference for prevention of rockburst by using the UDEC numerical simulation modelling
Summary
Coal mining is closely related to blasting, transportation, mechanical operation, and other activities; the whole process of mining is accompanied with the generation and interference of shock wave. Because the rockburst occurrence relates closely to the dynamic instability of surrounding rock in higher static stress concentration state, the static stress combined with shock wave interference is extensively used to reveal the mechanism and influencing factors of rockburst failure of coal-rock, and many fruitful results have been obtained. As stated by Zhao et al [6], the calibration work of UDEC modelling on P-wave propagation across single linearly and nonlinearly deformable fractures was conducted. Based on the geological and mining conditions of 1111(1) working face at Zhuji coal mine, the whole process of rockburst failure of surrounding rock in roadway subjected to the disturbance of shock wave was simulated and recurred, and the effect rules of the immediate roof thickness and strength overlying the mining coal seam and with or without bolt support on rockburst failure of roadway were analyzed in detail
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