Study on disaster mechanism caused by rock burst on working face under the impact of fault groups
In order to deeply study the disaster mechanism induced by the impact of passing through fault groups under mining disturb-ance in the working face,the WII02040501 working face of the No.M4-5 coal seam in Tunbao Coal Mine was selected as the research object to study the influence of fault groups on the disaster mechanism of working face during the mining disturbance process.A numer-ical simulation was constructed to study the evolution law of surrounding rock stress and energy when the working face passes through fault groups.Combining PASAT detection of coal body stress to study the stress evolution of the working face when passing through the fault group area,the evolution characteristics of the working face under the influence of"multiple fields"in the fault group were ob-tained,revealing the sliding instability and impact disaster mechanism in the fault group area.The research results show that the fault groups before and after mining have a significant impact on the stress distribution of the working face.When the working face passes through the coal seam group,the stress and energy produce a"pressure relief"effect,showing a phenomenon of early activation.When the drop of the fault group is too large,the stress and energy increase and produce a sudden change phenomenon.The overall fault dam-age shows a characteristic of"from top to bottom,from the middle to both sides",and the risk of impact is significantly increased.Based on on-site PASAT measurements,it was found that faults have a significant impact on the stress concentration of coal seams,which veri-fies that the distribution characteristics of impact risk areas are highly affected by the stress concentration of fault group coal bodies.This provides theoretical guidance for predicting rock burst disasters in working faces passing through fault groups.
万方数据
维普
