| With the increase of coal mining area and intensity,the form of mine disaster presented diversified and frequent,and the rock burst has become a common power disaster in deep working.Due to the complexity of the rock burst,the suddenness of the process,the short process etc.,once the rock burst in the event,it will cause a great loss of equipment,casualties and the followed social problems.So the response to rock burst should do well in mine prevention and control work.14318 working face of Dongtan 14 mining area,as an example,was analysed by the empirical example,experimental identification,stress calculation,theoretical analysis and numerical simulation in this paper.Induction factors of rock burst about 14318 working face in the process of excavation and stoping were analysed and the danger zones were divided.According to the geological data and field monitoring data of Dongtan coal mine,the empirical model was used to predict the influence of the advancing support pressure of working face.Through theoretical analysis,the influence degree of deep drawing depth,coal rock mass impact tendency,geological structure,roof hard rock layer,stress concentration,adjacent goaf and other factors on the impact of ground pressure in 14318 working face was determined.Mechanical calculation was used to certain the increased stress area in the front of the working face.And then numerical simulation method was applied to further determine the stress distribution which affected by two-way mining face.Finally,the impact index of 14318 working face was predicted by comprehensive index evaluation method and impact ground pressure condition method,and the hazard areas were divided.In this paper,a feasible model for predicting the rock burst is discussed,which provides technical support for safe mining of working face.This method can provide reference for the prediction in subsequent mining work,and laid a certain foundation for the study of rock burst. |
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