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Published byMilton McBride Modified over 9 years ago
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Photogrammetric Monitoring of Rock Mass Behavior in Deep Vein Mining Donovan Benton, Mining Engineer Stephen Iverson, Mining Engineer Jeffrey Johnson, Mining Engineer Lewis Martin, Research Mechanical Engineer NIOSH, Office of Mine Safety and Health Research Spokane, WA
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Outline Field photogrammetry system Lab photogrammetry system Measurement verification Field Lab Lab verification
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Field Photogrammetry System Three auxiliary lights Nikon D80 camera Sigma 10mm-20mm lens Tripod Survey control points
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Simple field setup Camera spacing Distance to face Pixel density Control points or scale D D/5 to D/8 plan view
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Photogrammetry Reconstruction Fault Trace Three pairs merged
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Quality Improvement January 2013--camera handheld using flash May 2013--Tripod, auxiliary lights, timed exposure
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Closer Look
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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
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Alternative
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Changing Ground Conditions
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Unity Software Visualization photogrammetric monitoring of fault exposures to fully characterize observable slip
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Lab Photogrammetry System Camera type Nikon D800 digital SLR LensSigma 20 mm Horizontal field of view 84 degrees Vertical field of view61 degrees Effective image pixels36.3 million Pixel resolution at 5 m0.1 cm by 0.1 cm
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High Energy High Displacement Test (HEHD)
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Stripping Panel Forms
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Mount and Torque Panels
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Panel Test
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Panel Test (1 frame per second)
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Point Cloud Reconstruction
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Measurement Verification
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Accuracy Results Linear measure Volume measure
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Absolute and Average Error
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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.
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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.
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Questions?
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