某铁矿露天转地下开采的境界矿柱厚度确定及稳定性分析  

Thickness Determination and Stability Analysis of Boundary Pillar in Transition from Open-Pit to Underground Mining of An Iron Mine

作　　者：刘泽洲 熊鹏 雷明 冯福康 杨志高 LIU Zezhou;XIONG Peng;LEI Ming;FENG Fukang;YANG Zhigao(Changsha Institute of Mining Research Co.,Ltd.,Changsha,Hunan 410012,China;Hunan Provincial Research Center for Mine Geological Disaster Prevention and Environmental Reconstruction,Changsha,Hunan 410012,China)

机构地区：[1]长沙矿山研究院有限责任公司,湖南长沙410012 [2]湖南省矿山地质灾害防治与环境再造技术研究中心,湖南长沙410012

出　　处：《矿业研究与开发》2024年第7期1-6,共6页Mining Research and Development

摘　　要：露天矿的坑底境界矿柱布设是露天转地下开采中常见的问题。针对某铁矿露天转地下工程,基于理论计算和工程类比法计算该铁矿境界矿柱的留设厚度,采用FLAC3D数值模拟软件对开采过程中矿柱的位移、应力进行了分析。计算结果表明:该铁矿的合理境界矿柱厚度为40 m;井下爆破作业引起的爆破振动对境界矿柱影响很小;境界矿柱中心岩体的变形量一直处于较小波动,虽出现一定程度的应力集中现象,但最大压应力和最大拉应力均小于岩体自身强度,留设40 m厚的境界矿柱能满足矿山安全生产的需求。The layout of boundary pillars at the bottom of pit in open-pit mine is a common problem in transition from open-pit to underground mining.Aiming at the transition from open-pit to underground engineering of an iron mine,the thickness of the boundary pillar of the iron mine was calculated based on theoretical calculation and engineering analogy method,and the displacement and stress of the pillar in the mining process were analyzed by FLAC3D numerical simulation software.The calculation results are as follows.The reasonable thickness of the boundary pillar of the iron mine is 40 m.The blasting vibration caused by underground blasting operation had little effect on the boundary pillar.The deformation of the central rock mass of the boundary pillar had been in a small fluctuation.Although there was a certain degree of stress concentration,the maximum compressive stress and maximum tensile stress were less than the strength of the rock mass itself.The 4o m thick boundary pillar can meet the needs of mine safety production.

关 键 词：露天转地下 境界矿柱厚度 矿柱稳定性 数值模拟 

分 类 号：TD852[矿业工程—金属矿开采]