Laser 3D Detection and Stability Analysis of Underground Cavity
LIU Xi-ling
LI Xi-bing
LIU Ke-wei
WANG Wei-hua
ZHOU Zi-long
Abstract：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 identi-fication 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 la-ser 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 suit-able for FLAC~(3D). 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 equi-librium 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 move-ment above this cavity has stopped and tensile failure will not occur in the surrounding rock: This cavity is presently in a stable state.
Keywords：cavity detectionlaser 3D detectionSURPACFLAC~(3D)data transformationcav-ity stability
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 549-553 )