摘要
为确定水平采空区群条件下矿柱爆破回采的最佳爆破位置,结合陕西某大型金矿残矿回采工程,采用FLAC^(3D)数值模拟软件,对水平采空区群条件下"锥形"、"腰形"和"倒锥形"3种矿柱回采方案进行模拟研究。结果表明:空区群内待回采矿柱X向的位移变化为"腰形"方案>"锥形"方案>"倒锥形"方案;"腰形"削柱法对2~#、3~#和4~#空区顶板应力影响跨度比分别为50.8%、68.5%和28.5%,均小于其他方案,能够保证空区群的稳定性,说明"腰形"削柱法为矿柱回采最佳爆破位置。研究结果还表明,爆破回采矿柱过程中有塑性区出现,且以拉伸破坏为主,需采取适当的加固措施。
In order to determine the best blasting location of pillar blasting under level goaf group conditions,combined with a large gold ore mining engineering in Shaanxi Province,this article adopts the numerical simulation software FLAC^（3D）,and three pillar stoping schemes of ＂cone＂,＂waist＂and ＂inverted cone＂are simulated under the condition of level goaf group.The results show that displacement change of X direction of waiting pillar in goaf group is＂waisted＂program＂cone＂program＂inverted cone＂program,the influence span ratio of ＂waist＂cut column method for 2~#,3 ~# and 4~# cavity roof stress is 50.8%,68.5% and 28.5% respectively,are less than other schemes,to ensure stability of goaf group,it shows that＂waist＂cutting column method is the best blasting position of pillar stoping.The results also show that there is a plastic area in the process of blasting pillar,and tensile failure is the main factor,so proper reinforcement measures should be taken.
作者
白朝阳
王国伟
张鹏
刘拴平
BAI Zhaoyang WANG Guowei ZHANG Peng LIU Shuanping(Shaanxi Taihai Gold Mining Ltd., Co., Baoji 721607, Shaanxi, China Institute of Safety Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong , China)
出处
《黄金科学技术》
CSCD
2017年第4期81-86,共6页
Gold Science and Technology
基金
国家自然科学基金面上项目"复杂破碎金矿高效开采工艺技术"(编号:2012BAB08B02)资助
