摘要
采用分形几何学对离散元计算得出的急倾斜煤层开采覆岩裂隙发育进行了分析,结果表明,采空区上方岩土体节理裂隙发育边界角度较陡,近地表附近岩土体节理裂隙发育边界角度较缓.覆岩内裂隙闭合与张开裂隙的分形维数与开采深度呈线性关系,且两者之间的比值随采深的增加而增加,即覆岩内张开裂隙闭合率随采深的增加逐渐提高,说明浅部覆岩内裂隙的闭合对于阻止地表水入渗可起到积极的作用.对工作面内的雨水渗流量与裂隙闭合率关系进行深入研究,得出工作面的水渗流量与裂隙闭合率呈非对称抛物线关系,进一步证明了裂隙闭合的阻水作用.
By employing fractal theory, the evolution of the cracks in the overburden strata, which were obtained from distinct element numerical calculation, caused by high steep coal seam mining was analyzed. It shows that the fracture angle in border of the collapsed zones is steeper than that near the surface. With the increase of the explo- ration depth, the fractal dimensions of opening and the closed cracks in the roof strata increase. The ratio of the fractal dimensions of closed cracks to the opening cracks gradually increases with the exploration depth. It indicates that the closing ratio of the opening cracks increases with the exploration depth. The closure of the cracks plays an active role in prevention of rain flowing into the mining face. The study manifests the relationship between the flux in the working face and the ratio of crack closure in the overburden strata, which shows a parabolic form. It verifies further the active role of crack closure in prohibition of fluid flow in the mining influenced strata.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2008年第2期162-165,共4页
Journal of China Coal Society
关键词
急倾斜煤层
裂隙
分形几何
闭合率
high steep coal seam
cracks
fractal geometry
the closing ratio
