摘要
煤层钻孔的失稳破坏是一个非常复杂也是一个极其常见的问题,煤层钻孔的稳定性对煤层瓦斯抽采以及煤层注水都有着非常重要的意义。基于D-P准则和UDEC数值模拟的方法对钻孔失稳破坏进行研究,研究表明,随着节理密度的增大钻孔周围的剪切位移呈指数增加;钻孔首先在孔壁处发生拉伸破坏,随着煤体沿径向向深部转移,钻孔周围的煤体逐渐发生剪切破坏。
Instability and failure of coal seam drilling is a very complex and common problem, stability of coal seam drilling is very im- portant significance to seam gas drainage and coal seam water injection. Drilling instability is studied based on the D - P criterion and UDEC numerical simulation method. Research shows that shear displacement around the drilling increases exponentially with the joint density increasing, the drilling occurs tensile failure firstly in the wall of drilling, coal body is gradually shear failure with the coal a- long the radial transferring to deep hole.
出处
《煤矿安全》
CAS
北大核心
2013年第3期160-162,165,共4页
Safety in Coal Mines
关键词
钻孔
失稳破坏
D—P准则
UDEC
节理密度
拉伸破坏
剪切破坏
drilling
instability and failure
D - P standard
UDEC
the joint density
tensile failure
shear failure
