小煤柱应力集中区钻孔卸压效果的数值模拟

Numerical simulation of small pillar stress concentration areas borehole pressure relief effect

在分析钻孔卸压机理的基础上,用ADINA模拟了小煤柱应力集中区钻孔卸压效果,得出了钻孔周围位移与应力分布变化规律。通过小煤柱应力集中区钻孔卸压效果模拟表明:合理钻孔孔径和孔距的卸压孔可以导致煤层结构性破坏,从而使应力峰值向深部转移。研究表明:钻孔对小煤柱应力集中区卸压效果十分显著。

This paper is based on analyzing the mechanism of borehole pressure relief,using the ADINA finite element software to simulate the borehole pressure relief effect,educing the law of stress and displacement changes around of borehole.Through contrast small pillar stress concentration areas different aperture and spacing of borehole,it is found that rational located pressure relief boreholes can induce structural failure of the surrounding coal mass,consequently,the high stress move deeply in the coal-mass,sm...