SESSION 3B: MANAGEMENT OF INSTABILITIES
Abstract
Open pit design utilizes core-logging and mapped discontinuity data to kinematically determine the optimal geotechnical slope designs. However, with the demand for steepening of open pit slopes to optimize strip ratio, some shallower discontinuities may create unfavourable kinematic conditions that require additional risk mitigation to support steeper slope angles.
This paper presents a case study from Rainy River Mine in Northern Ontario, where kinematic controls on wedge and planar stability failure mechanisms were assessed, and stabilizing rock bolt patterns were designed.
A practical approach is presented for collecting high-quality slope scan data using drone photogrammetry and light detection and ranging (LiDAR) techniques, generating detailed representations of potential slope risks. Utilizing RocScience’s RocSlope3 numerical modelling code (software), accurate 3D models of the slope profiles were developed, incorporating discrete discontinuities, orientations, and persistence model inputs. The factor of safety resulting from RocSlope3 models are compared to simplified slope profiles modelling techniques in RocScience SWedge and RocPlane. Fit-for-purpose stabilizing rock bolting patterns are prepared to meet design acceptance criteria.
This case study emphasizes the importance of integrating widely available scanning techniques to develop representative 3D models, which are critical to develop effective stabilization solutions of complex sliding failure geometries.
Authors
- Steve Boileau, SRK Consulting, Canada
- Ed Saunders, SRK Consulting, Canada
- Corey Kamp, New Gold, Canada
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