长壁法开采缓倾斜极薄铁矿体围岩变形破坏机理  

Deformation and failure mechanism of cap rock in mining a gently inclined and extremely thin iron mine by the long-wall method

作　　者：宋卫东[1,2] 徐文彬[1,2] 杜建华[1,2] 万海文[1,2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与环境工程学院,北京100083

出　　处：《北京科技大学学报》2011年第3期264-269,共6页Journal of University of Science and Technology Beijing

基　　金："十一五"国家科技支撑重大计划资助项目(No.2007BAB15B03)

摘　　要：提出用长壁法开采缓倾斜极薄类铁矿体.建立了相似材料模型,借助全站仪、应变计和数码相机等仪器监测了模型围岩的变形、应力以及破坏情况,研究了坚硬围岩垮冒规律、应力变化、变形变化和围岩破坏特征.实验结果表明:围岩的破坏具有明显的间歇性和突变性,顶板断裂步距基本相同,断裂方向相互平行;在垂直方向上,处于不同位置的围岩断裂步距不同.得到了围岩的来压周期与移动规律.The long-wall method was used to mine a kind of gently inclined and extremely thin iron ore deposit. A similar material model was built for the iron ore deposit, the deformation, stress and failure of cap rock were monitored with an electronic total station, strain gauges and digital cameras. The collapse law, the variation of stress and displacement, and the deformation mechanism of stiff cap rock were studied during mining the gently inclined and extremely thin iron ore mine by long-wall method. Experimental results show that the collapse of cap rock is sharply intermittent and jumping, the fracture pace of the collapse roof is the same as previous steps, and the orientation of fracture is almost parallel. In the vertical orientation, the fracture pace relates with the location of rock. The fracture period and the movement law of cap rock were also obtained.

关 键 词：铁矿 采矿 围岩 失效 变形 

分 类 号：TD325.1[矿业工程—矿井建设]