Study on rockburst mechanism induced by discontinuous pressure relief of wide coal pillars
In terms of the phenomenon of rockburst induced by discontinuous pressure relief of wide coal pillars in western mining area,based on field measurement and theoretical analysis,the pressure characteristics,coal pillar stress distribution characteristics and microseismic activity characteristics of pressure relief area and non-pressure relief area are studied.The analysis model of rockburst induced by discontinuous pressure relief of wide coal pillars is established,and the mechanism of rockburst induced by discontinuous pressure relief of wide coal pillars is revealed.On this basis,the prevention and control method of rockburst of wide coal pillars is discussed.The results show that under the action of upper lateral roof and advanced abutment pressure,the stress concentration area will transfer to the middle of the non-pressure relief coal body,which is prone to unstable instability.Dynamic load disturbance caused by roof breaking is also an important factor to induce wide coal pillar burst.The results of this study will provide technical support for the prevention and control of rockburst from wide coal pillars in coal mine.
discontinuous pressure reliefrockburstwide coal pillarprevention and control technology
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