Study On The Pressures Behaviors Of "Three Soft" Working Face With Large Mining Height And Controling Technology

In the light of Huainan Mining Group pan mine in "Three Soft" big mining height2141(3) working face with complicated geological conditions, this paper adopted in working face by field test, numerical simulation and theoretical analysis and other means, to analysis mine pressure appearance characteristics, coal wall spalling failure mechanism and control techniques. Based on the field observation of work, was analyzed first weighting interval of immediate roof, first and periodic weighting interval of basic roof, abutment pressure distribution of roadway. Secondly, to get mining pressure behavior with the coal in "three soft" and "two hard" of geological conditions using the numerical simulation. Focus on comparative analysis of working face in the course of advancing the roof and floor of the plastic zone, vertical stress, horizontal stress, principal stress, vertical displacement and horizontal displacement distribution from the working surface strike and dip direction. And then in the field observation of coal wall spalling and the basis of theoretical analysis, using numerical simulation software, create a number of different mining height model, simulation analysis wall plastic zone, vertical stress and horizontal displacement distribution under different mining, to get the coal wall spalling mechanism, advance support stress influence scope and distribution law. Finally based on the above research results, it is concluded that the characteristics of mine pressure behavior and spalling failure mechanism in2141(3) working face and put forward the corresponding control measures, to provide technical guidance for work safety production, achieve the safe and efficient production, for other same geological condition of coal seam mining under accumulated valuable experience.Figure38Table15Reference50...