Photogrammetric Monitoring of Rock Mass Behavior in Deep Vein Mining Donovan Benton, Mining Engineer Stephen Iverson, Mining Engineer Jeffrey Johnson,

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Presentation transcript:

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

Outline Field photogrammetry system Lab photogrammetry system Measurement verification Field Lab 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 Fault Trace Three pairs merged

Quality Improvement January camera handheld using flash May 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 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

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 +/ inches. Lab system Average linear error was +/ inches. Average volume error was 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?