空区三维激光探测技术及稳定性分析

由于受采空区周边地质条件和探测技术的制约，传统空区探测技术手段无法得到工作人员不能进入的空区精准数据，以此为基础进行采空区稳定性分析的可靠性程度很低。利用三维激光扫描系统（MDL-VS150）对空区进行精准的激光扫描，基于三维激光探测所得的点云数据，结合3Dmine软件建立采空区的三维实体模型，运用FLAC3D软件进行空区稳定性分析。根据计算结果对某铁矿采空区的位移和应力进行分析，采空区垂直位移量最大为4.437 cm，围岩的最大拉应力和压应力分别为0.795、3.221 MPa，均小于岩体的抗拉及抗压强度。由此表明，采空区处于稳定状态，在短期内不会发生破坏，但为了矿山长期发展应对空区及时采取有效处理措施。

3D Laser Scanning Detecting Technology and Stability Analysis of Goaf

Due to constraints from the geological conditions of goaf and the detection techniques,the traditional detection techniques for goaf cannot obtain accurate data from the area where the staff cannot enter in.The reliability based on these cavity data is so low for stability analysis of goaf.Therefore,3D laser scanning system(MDL-VS150) is used to make an accurate laser scanning.3D point cloud data,based on the 3D laser scanning,are adopted to build 3D entity model of the goaf by 3Dmine software.Based on FLAC3D software,the stability of goaf is analyzed.Then,the displacement and stress of the goaf in an Iron Mine are analyzed according to the simulation calculation results.The maximum vertical displacement is about 4.437 cm,and the maximum tensile and compressive stress in the surrounding rock are respectively 0.795 MPa and 3.221 MPa,which are lower than the tensile and compressive strength of rock.Therefore,goaf is presently in a stable state and collapse will not occur in a short term.However,the effective treatment measures should be taken timely for the long-term development of the mine.