基于FLAC^(3D)的复杂条件下露天转地下开采空区围岩变形及破坏特征  

Goaf surrounding rock deformation and failure features using FLAC^(3D) in underground mining shifted from open-pit in complex situation

作　　者：史秀志[1] 黄刚海[1] 张舒[1] 周健[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第6期1710-1718,共9页Journal of Central South University:Science and Technology

基　　金：国家"十一五"科技支撑计划项目(2006BAB02A02);中南大学学位论文创新基金资助项目(2009ssxt230)

摘　　要：针对铜绿山Ⅰ号矿体露天转地下开采的复杂情况,采用FLAC3D分析不同跨度D及立柱厚度d下采空区围岩的变形及破坏特征;用FISH语言定义岩石剪切破坏的摩尔-库仑判据,实现单元体剪切破坏判据值及其他关键参数在运算过程中的动态监测。依据研究结果,为施工设计提供合理工艺参数。研究结果表明:在空区上移过程中,空区顶板位移及围岩塑性变形区均先减小后增大;立柱稳固时,两者仅与空区跨度有关;立柱不稳固时,立柱厚度开始产生较大影响,跨度增大或立柱变薄,可使两者显著增大,并使空区在更大的顶柱厚度下便受到了露天坑底板压力的影响;立柱稳固时,空区破坏形式均为顶板两端剪切破坏;当跨度D=10 m,且立柱厚度d≤4 m时,立柱开始不稳固,空区破坏形式逐渐转向立柱破坏。For the complex situation of orebody Ⅰ in Tonglvshan underground mining shifted from open-pit,the deformation and failure features of goaf surrounding rock under different spans D and column thickness d were carried out by FLAC3D software.Using FISH language to define Mohr-Coulomb criterion for rock shear failure,zone＇s shear failure criterion and other key parameters in the course of calculation can be monitored.Lastly,according to the research results,reasonable process parameters for mining design are provided.The research indicates that during the process of goaf＇s uppers shifting,the displacement of roofs and the area of rock＇s plastic deformation reduce firstly,and then increase.When the column is steady,both of them are only related to span;When the column isn＇t steady,column thickness has influence on them,the increase of span or the decrease of column thickness make them increase conspicuously,and cause that the goaf to be influenced by the pressure on open-pit floor under thicker pillar.When the column is steady,the form of goaf failure is that both ends of roof are shear failure;When span width D is 10 m and column thickness d≤4 m,the column is unsteady,and the form of goaf failure shifts to column failure.

关 键 词：采矿工程 采空区 围岩变形 剪切破坏判据 

分 类 号：TD325[矿业工程—矿井建设]