1. Geotechnical Monitoring LiDAR GML-Underground A global convergence monitoring solution
Presented by Nick Boswell

2. GroundProbe GML System
GroundProbe has developed a purpose built underground convergence monitoring solution for geotechnical engineers.
A culmination of 4 years of product development applying 15 years of geotechnical slope monitoring experience.
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3. Full spatial resolution monitoring
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4. GML Underground Mobile Solution
Rapid data acquisition
Immediate processing
Data filtering
Vehicle or tripod mount
Wi Fi data transfer
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5. Monitoring support
Control points were selected on seven the cable bolt centres across the yielding zone to assess the effectiveness of the support and define the potential zone of collapse
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6. Bulking around cable bolts
2-2.5mm deformation over 25 hour period between bolts
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7. Coherence image
Delta coherence image shows indication of micro-fracturing/failure in high yield zone
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8. Monitoring individual bolts
Deformation plots on cable bolt control points indicate which cables are beginning to yield/stretch or fail in the centre of the area of concern
<0.5mm
<0.06mm
3.3mm
1.9mm
2.4mm
<0.5mm
0.7mm
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9. Measuring floor heave
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10. Applications
Continuous real time monitoring of LOM infrastructure for early warning of damaging mining practices or progressive damage
Targeted ground support to reduce rehabilitation costs and monitor effectiveness of existing and new support
Test and evaluate new support designs to monitor for effectiveness and reduce costs
Regional blast damage assessment
Maximise the operational life and value of extraction points/drives to maintain safe access as long as reasonably possible. Develop quantitative damage assessment criteria.
Evaluate the regional effectiveness of cement plugs and other backfill methods to optimise processes and reduce costs
Compliment or replace other simple convergence measurement data with well defined quantitative full spatial resolution velocity analysis criteria to eliminate subjectivity when assessing rock mass damage
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