Research on the Stability of Overburden Rock and Mine Pressure Appearance in Fully Mechanized Caving Mining of Extra Thick Coal Seams
In order to solve the problem of difficult control of mine pressure manifestation and tunnel surrounding rock deformation during mining,numerical simulation software was used to study the mining pressure manifestation and overlying rock stability of ultra-thick coal seams.Firstly,the stress of tunnels under different coal pillar widths was analyzed.It was found that as the width of the coal pillar in the tunnel increased,the bearing capacity of the coal pillar gradually increased,and the disturbance of the corresponding lateral support stress on the surrounding rock gradually decreased.The degree of rock fragmentation of the coal pillar also showed a decreasing trend,but the value of the stress peak gradually increased.At the same time,the deformation of the tunnel showed a trend of diverging from the center of the tunnel to the surrounding areas.The deformation increased near the surface of the tunnel,while the deformation of the surrounding rock decreased further away from the surface of the tunnel.Through this study provides a certain basis for pressure control.
numerical simulationmineral pressure manifestationsurrounding rock deformationfissure development
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NSTL
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