photogrammetric monitoring of rock mass behavior in deep vein mining donovan benton, mining engineer...
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Photogrammetric Monitoring of Rock Mass Behavior in DeepVein MiningDonovan Benton, Mining EngineerStephen Iverson, Mining EngineerJeffrey Johnson, Mining EngineerLewis Martin, Research Mechanical Engineer
NIOSH, Office of Mine Safety and Health ResearchSpokane, WA
Outline
• Field photogrammetry system• Lab photogrammetry system• Measurement verification
FieldLab
Lab verification
Field Photogrammetry System
• Three auxiliary lights• Nikon D80 camera• Sigma 10mm-20mm lens• Tripod• Survey control points
Simple field setup
• Camera spacing• Distance to face• Pixel density• Control points or scale
D
D/5 to D/8
plan view
Photogrammetry Reconstruction
FaultTrace
• Three pairs merged
Quality Improvement
January 2013--camera handheld using flash
May 2013--Tripod, auxiliary lights, timed exposure
Closer Look
Photogrammetry Software
• Shapemetrix3D—3GSM• 3DM Analyst—Adam Technology• PhotoModeler Scanner—Eos Systems Inc.• Bundler/PMVS2—Open source software
• Sirovision—CAE Mining
PMVS2--Patch-based Multi-view Stereo Software
Alternative
Changing Ground Conditions
Unity Software Visualization
• photogrammetric monitoring of fault exposures to fully characterize observable slip
Lab Photogrammetry System
Camera type Nikon D800 digital SLR
Lens Sigma 20 mm
Horizontal field of view
84 degrees
Vertical field of view 61 degrees
Effective image pixels 36.3 million
Pixel resolution at 5 m 0.1 cm by 0.1 cm
High Energy High Displacement Test (HEHD)
Stripping Panel Forms
Mount and Torque Panels
Panel Test
Panel Test(1 frame per second)
Point Cloud Reconstruction
Measurement Verification
Accuracy Results
Linear measure
Volume measure
Absolute and Average Error
Measurement Verification Summary
Field system•Average linear error was +/- 0.03 inches.
Lab system•Average linear error was +/- 0.05 inches.•Average volume error was +- 1.76 percent.
Photogrammetry Conclusions
• The field system is a fast and relatively inexpensive way to document site conditions.
• The lab system using dual cameras allows documentation for fast moving experiments.
• Linear and volumetric measures are within acceptable limits for determining ground movement.
Questions?
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