不同工况下挂帮矿回采诱发边坡失稳的数值模拟研究  

Numerical simulation of the hanging wall ore mining induced slope instability in different working conditions

作　　者：韩超超[1] 赵雨薇 王大国[1] 何治良[1] 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《中国矿业》2018年第2期101-106,135,共7页China Mining Magazine

基　　金：国家自然科学基金项目资助(编号:41372301;41641027);四川省教育厅科研项目资助(编号:15ZB0124);西南科技大学龙山学术人才科研支持计划资助(编号:17LZX421)

摘　　要：为探究无底柱分段崩落法开采挂帮矿对露天边坡稳定性的影响,以湖北某铁矿挂帮矿开采为工程背景,分析边坡在不同边坡倾角、矿体倾角和矿体埋藏深度等条件下坡体内第一主应力演变过程和裂纹扩展过程。结果表明:随着边坡倾角、矿体埋藏深度增加,塌落的松散岩体体积逐渐增大;随着矿体倾角增大,塌落的松散岩体体积呈现为先增大后减小的趋势。矿体倾角和矿体埋深一定的条件下,边坡倾角大于40°时的采空区不能完全容纳松散岩体;边坡倾角和矿体埋深一定的条件下,矿体倾角小于30°时的采空区不能完全容纳松散岩体。In order to study the influence of hanging mine by non-pillar sublevel caving method on stability of open pit slope, the crack-growth process and the evolution process of the first principal stress in the slope of an iron hanging mine mining in Hubei are analyzed in conditions of different slope inclination, orebody dip angle and ore burial depth, The results show that the fall of loose rock mass volume increases with the increase of slope inclination and buried depth of orebody. With the increase of the orebody dip angle,the volume of the loose rock mass of the collapse is the trend of increasing first and then decreasing. When the orebody dip angle and ore burial depth under certain conditions, the mined out area cannot fully accommodate the loose rock mass when the slope angle is greater than 40 degrees. With the determined slope inclination and ore burial depth, the mined out area cannot fully accommodate the loose rock mass when the orebody dip angle is less than 30 degrees.

关 键 词：挂帮矿 无底柱分段崩落法 第一主应力 裂纹 数值模拟 

分 类 号：TD862[矿业工程—金属矿开采]