小煤柱应力集中区钻孔卸压机理的数值模拟研究

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

文章分析了小煤柱应力集中区钻孔卸压机理,利用ADINA有限元软件模拟了钻孔卸压的作用机理、钻孔动态损伤破坏发展和应力场重新分布过程;通过小煤柱应力集中区不同钻孔孔径和孔距数值模拟对比发现:具有合理钻孔孔径和孔距的卸压孔可以导致煤层的结构性破坏,从而使煤柱高应力区向深部转移。仿真结果表明,小煤柱应力集中区钻孔卸压对控制煤柱变形与破坏具有显著效果。

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.