Sensitivity Testing of the Newly Developed Elliptical Fitting Method for the Measurement of Convergence in Tunnels and Shafts

摘要: Light Detection and Ranging (LiDAR) has become more widely used in the geotechnical community as its number of applications increases. It been shown to be useful tunneling for such rockmass characterization discontinuity measurement. LiDAR data can also measure deformation tunnels, but before a comprehensive methodology developed, accuracy issues associated with scanning must fully understood. Once are well understood, any analysis technique that uses tested ensure determined have minimal impact on results analysis. To prove usefulness newly developed elliptical fitting method measurement convergence tunnels shafts proposed by Delaloye et al. (Eurock 2012), was conducted then sensitivity test completed. The show using statistical techniques built into fit profile analysis, levels real change (convergence), within nominal level random systematic noise included data, measured confidence. Furthermore, new is robust enough handle large amounts occlusion or missing perimeter coverage sets.