露天转地下开采境界矿柱安全厚度稳定性分析  

Stability Analysis of Boundary Pillars Safety Thickness for Transition from Open Pit to Underground Mining

作　　者：杨宇江[1] 李元辉[1] 尹国光 韩洪江 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]山东黄金归来庄矿业有限公司,山东平邑273300

出　　处：《东北大学学报（自然科学版）》2011年第7期1032-1035,1040,共5页Journal of Northeastern University(Natural Science)

基　　金：国家科技支撑计划项目(2008BAB34B02);中央高校基本科研业务费专项资金资助项目(90401006);国家自然科学基金资助项目(50974031);教育部新世纪优秀人才支持计划项目(NCET-10-0275);教育部基本科研业务费青年教师科研启动基金资助项目(N090301002)

摘　　要：以归来庄金矿露天转地下开采过渡期为工程实例,采用FLAC3D软件,分别考虑静态和动态载荷,对预留境界矿柱的安全厚度展开分析.在动载时,采用常用的三角形波模拟爆破施工荷载,得到爆破振动作用下不同厚度境界的振动速度和应力的分布规律.根据两者之间的统计关系,并结合岩石的抗拉强度准则,分析了不同厚度境界矿柱发生破坏的临界振动速度.计算结果表明:垂直方向振动速度和拉应力最大值之间为线性关系,可采用质点最大振动速度作为安全判据.当矿房跨度分别为8,10和12 m时,在动载作用下,最小安全厚度分别为8,14和18 m.Based on the conditions of open pit and underground mining of Guilaizhuang gold ore,the stability of different thickness boundary pillars was assessed with considering the effect of static load and dynamic load,respectively,by using software of FLAC3D.Under dynamic load,blasting construction load was simulated with usual triangular wave,the vibration velocity and the stress distribution laws of different thickness were then achieved.According to the statistical relationship and the tensile strength standards of rock,the threshold vibration velocity for the boundary pillars with different thickness was analyzed.The results showed that the relationship between the vertical vibration velocity and the maximum tensile stress is linear.The maximum vibration velocity of a particle can be used as the safety criterion.When the ore room span is 8,10 and 12 m, under the dynamic loads,the minimum safety thickness is 8,14 and 18 m,respectively.

关 键 词：采矿工程 境界矿柱 爆破荷载 数值模拟 振动速度 

分 类 号：TD323[矿业工程—矿井建设]