Research On Prediction And Prevention About Brust Rock Under The Complex Mining Of Coal Face In The No.2 Jining Coalmine

With the depth of coal mining and the degree of complex geological conditions increased,the numbers of rock burst disaster are also in an increasing trend.When the rock burst happened,it will not only influence the tasks of coal mine production,but also damage the mining equipments and injure the workers.So it is necessary for us to be more thorough and systematic research on the protective mechanism of the rock burst.Through the scene investigates and studies,testing,numerical simulation and theoretical analysis method,this paper mainly researches the assessment of the rock burst hazard in the course of the mining and excavating and the corresponding technology of preventing and controlling the rock burst in 103down01 working face of the No.2 Jining coalmine.Firstly by the methods of the scene investigates and experiment to reseach geological material of the 103down01 working face and identify the 3down coal seam has the burst liability and its roof has the weak burst liability.Then simulating the advance of the coal face by the Flac3D to simulate the rule of strata behaviors of coal face and research the stress distribution and evolution rule of coal pillar which is in front of working face and behind the working face.The research shows that the stress has changed a lot at the initial pressure and the closing to "Square".Analysising the conditions of the brust rock by varieties of factors and comprehensive index.Determining the impact hazard in the process of the working face stopping process by "three conditions" of the brust rock and the comprehensive index.The research shows that comprehensive index is 0.71 and the working face has medium brust rock.Simultaneously,the two medium brust rock zones and two weak brust rock zones have been determined by the simulating by the Flac3D and analysising influences factors.Combining the micro-seismic monitoring with on-line monitoring to analysis the rule of appearance of the mine pressure.Finally,dividing the dangerous area of the brust rock.Making a solution of preventing and controlling the rock burst to achieve the purpose of safety production.The research achievement of this paper has a practical guiding significance for the No.2 Jining coalmine in the later mining,and provides the mine safety production with a certain technical support,and Iays a certain foundation for the rock burst.