Research On The Mine Pressure Feature Of Large Mining Height Fully Mechanized Caving Face In Deep Mine

With the increasingly development of coal mining in deep well, it is particularly important to study on the stope especially large mining height fully mechanized face of mine pressure regularity. In this paper, focusing on the large mining height fully mechanized caving face under the condition of deep well mine pressure feature, using similar simulation, numerical simulation, field measurements, the oretical research methods on the basis of the2301full-mechanized caving mining face in Longgu Coal Mine. Through the graphic simulation, studied in fully mechanized caving face of overlying strata movement; through numerical calculation and analysis of the stope stress distributions and deformation characteristics of surrounding rock; based on the field test study on behavior law of mine pressure and support adaptability; Through the analysis of the characteristics of coal wall spalling of the horizontal stress distribution and spalling characteristics; based on the field observation of the behavior law of mine pressure and support adaptability. Research results show that:1. In2301working face,the falling height is34m,thw fractured zone height is58m, the curved sinking maximum vertical displacement is5.6m, goaf stability from coal wall30m, mining process of direct roof falling not completely filling the gob area, the overlying strata movement is severe, fissure development is more.2. With the depth and mining height increases, the vertical stress, vertical displacement increases at the same time, advance support stress concentration coefficient decreased, ahead of peak fronting, advance the influence scope and the stable equilibrium point of coal wall distance. Different is, advance stress peak as the depth increases with the increase of the height of, apheresis decreases.3. Periodic weighting distance is8.3~19.7m, the average periodic weighting distance is13.6m, fluctuation range, dynamic load coefficient on average1.38, sometimes greater than the first pressure when the dynamic load coefficient; upper pressure maximum, stent after column pressure.4. With the side wall plate uniform load increasing, the maximum deflection point position from the bottom of the range decreased exponentially; the coal wall plastic zone width and horizontal tensile stress of random mining height increases. Cutting height when coMPared with3M,6m machine mining height coal wall horizontal tensile stress, plastic zone width of1.6MPa and12.5m, were increased by13.1%and13.6%.This article in deep Full-mechanized Caving Mining with large mining height face pressure in terms of the inquiry, which provides guidance and reference in Longgu Coal Mine other working face support selection, protection and production management.Figure:[49]:Table:[19]:Reference:[54]...