【摘要】 基于缓倾斜薄铁矿体特征,提出用液压支护长壁法开采缓倾斜薄铁矿体新方法。以官店铁矿凉水井大庄矿段-8’至-16’线范围矿体为研究对象,采取相似模拟方法对围岩应力、位移和塑性区域变形与破坏规律进行实验研究;采用数值模拟对工作面采场围岩应力、位移和塑性区域变化进行模拟研究,并与相似实验结果进行对比分析。结果表明:围岩破坏具有明显间隙和突变性,断裂方向相互平行;位置不同围岩在垂直方向上断裂步距不同;工作面端部受剪切作用明显,空区顶部受拉作用突出;靠近工作面下沉值较小,呈抛物线型。更多还原

【Abstract】 Based on the characteristics of gentle dip and thin iron ore body,the new method of longwall mining with hydraulic support is proposed to explore the ore body.In this paper,taking the ore body from-8’to-16’section between the Liangshui Well of Guandian iron mine and Dazhuang mine as the research object,the deformation and failure regularities of surrounding rock in stress,displacement and plastic zones were studied firstly by similar simulation experiment.Then,numerical simulation was applied to simulate the variation rules of surrounding rock in stress,displacement and plastic zones,and the results was also compared with the similar simulation experiments.The results show that the destruction of surrounding rock has obvious characteristics of intermittent and mutagenicity,and the fracture directions are parallel to each other.In the vertical direction,the fracture step of surrounding rock changes in different locations.Meanwhile,it shows evident shear action in the face end,and prominent tension action in the top of goaf.In addition,the surface subsidence near the working face is smaller,and shows parabola shape.更多还原