地下空区激光三维探测及稳定性分析  

Laser 3D Detection and Stability Analysis of Underground Cavity

作　　者：刘希灵[1] 李夕兵[1] 刘科伟[1] 王卫华[1] 周子龙[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：《中国矿业大学学报》2009年第4期549-553,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重大项目(50490274);国家科技支撑计划(2007BAK24B00)

摘　　要：为了解决地下空区对露天矿安全生产的影响,针对洛钼集团露天开采境界下覆不明空区,利用激光三维扫描系统通过地表钻孔对空区进行精确三维探测,把激光三维探测的数据导入SURPAC建立空区三维块体模型,研究了SURPAC和FLAC3D的数据转换方式,并编制相应程序把空区三维块体模型导入软件FLAC3D进行稳定性数值分析.计算结果显示:该空区模型内各单元内的不平衡力趋近于0;节点(6066,4775,1430)处的Z方向位移趋近于恒定值;初始平衡状态下围岩最大位移量约为0.086 m;围岩中最大拉应力为1.52 MPa,应力集中区最大压应力为12.37 MPa,均小于岩体的抗拉、抗压强度.由此表明,该空区上方地表运动停止,空区上方围岩不会发生拉裂破坏,空区目前处于稳定状态.A laser three dimensional scanning system was used to identify cavities under the open-pit Luoyang Luanchuan Molybdenum Co. Ltd. mine. Safe production requires the identification of cavities smaller than a certain size, which might present a danger to operations. A diagram of the cavity＇s plan, with upper and lower face elevations, was developed from the laser 3D data. Laser data were imported into the software package SURPAK to form a 3D, block element model. A program was written to transform the data from SURPAK into a form suitable for FLAC3D. Numerical stability analysis was performed in FLAC^3D. The results show that each cell of this particular cavity has approximately zero imbalance. The （6 066, 4 775, 1 430） node approached a constant Z displacement. The maximum displacement from initial equilibrium in the surrounding rock is about 0. 086 m. Maximum tensile stress in the rock is 1.52 MPa and the maximum compressive stress, in the stress concentration zone, is 12.37 MPa. These are both smaller values than the actual rock-mass strength. Therefore, surface movement above this cavity has stopped and tensile failure will not occur in the surrounding rock. This cavity is presently in a stable state.

关 键 词：空区探测 激光三维扫描 SURPAC FLAC^3D 数据转换 空区稳定性 

分 类 号：TD76[矿业工程—矿井通风与安全] TD85