Numerical Simulation Research of Pressure Relief Mechanism of Borehole of Small Pillar Stress Concentrated Areas

The paper analyzed the pressure relief mechanism of borehole of small pillar stress concentrated areas,used ADINA finite element software to simulate the function mechanism of pressure relief of borehole,the development of dynamic damage and destruction of surrounding rock-mass,the redistribution of stress field around borehole.Through comparing numerical simulations in different apertures and pitchrows of borehole of small pillar stress concentrated areas,it was found that the pressure relief borehole with rational aperture and pitchrow could induce structural failure of the coal seam,consequently the high stress area of pillar moved deeply in the coal seam.The simulation result showed that pressure relief of borehole of small pillar stress concentrated areas has prominent effect for controlling deformation and destruction of the small pillar.