摘要
为探究软弱夹层影响下采用无底柱分段崩落法开采挂帮矿时的边坡稳定性,通过自建的岩石拉张破坏有限元模型,分析了露天边坡在不同弱层长度、埋深和倾角条件下,挂帮矿开采诱发边坡失稳破坏的范围。结果表明:随着弱层长度增大,2个分段挂帮矿开采后形成的采空区体积与塌落的松散岩体体积均逐渐增大,在弱层长度小于80 m的条件下,采空区体积大于松散岩体体积;随着弱层埋深、倾角增大,(1)分段挂帮矿在弱层埋深大于等于100m、弱层倾角大于等于15°条件下,开采形成的采空区体积大于松散岩体体积;(2)分段挂帮矿开采形成的采空区体积始终小于塌落的松散岩体体积。
In order to explore the stability of slopes in hanging wall ore mining by non-pillar sublevel caving method under the influence of soft interlayers, the range of slope instability and failure induced by mining of hanging wall ore under different soft interlayer length, burial depth and dip angle is studied by using self established finite element model of rock tensile failure. The results show that the goaf volume and the volume of loose rock mass formed after the mining of the two sections hanging wall ore increase with the increase of the length of the weak layer. Under the condition that the length of the soft interlayer is less than 80 m and the goaf volume is larger than the volume of the loose rock mass. With the soft interlayer burial depth and dip angle increasing, the goaf volume formed in the first section of the hanging wall ore mining is larger than the volume of the loose rock mass when the soft interlayer burial depth is greater than or equal to 100 m, dip angle is greater than or equal to 15°, and the second section of hanging wall ore mining formed the goaf volume always is less than the volume of loose rock mass.
作者
韩超超
赵雨薇
王大国
何金城
Han Chaochao;Zhao Yuwei;Wang Daguo;He Jincheng(School of Environmental and Resources,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《金属矿山》
CAS
北大核心
2018年第7期38-44,共7页
Metal Mine
基金
国家自然科学基金项目(编号:41372301)
四川省教育厅科研创新团队项目(编号:18TD019)
西南科技大学龙山学术人才科研支持计划项目(编号:17LZX421)
关键词
挂帮矿
软弱夹层
边坡破坏
裂纹
数值模拟
Hanging wall ore
Soft interlayer
Slope failure
Crackle
Numerical simulation