Open Portal Slope and Support Design:

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Presentation transcript:

Open Portal Slope and Support Design: Dilokong Chrome Mine ASA Metals (Pty) Ltd Pieter Groenewald Yolanda Bester 18 September 2009

Contents Introduction Location Data Collection Data Processing Input Parameters Numerical Modeling Results Recommendations

Introduction Geotechnical data acquisition The use of empirical and numerical methods to transform data Input parameters for FLAC/SLOPE modelling Probabilistic assessments and kinematic failure analyses. The portal geometry and support derived

Location The Dilokong Chrome Mine situated on the eastern limb of the Bushveld Igneous Complex (BIC) is planning to exploit the LG6A and LG6 Chromitite seams.

Data Collection Field Work Laboratory Work Core Logging Joint Orientation Sample Collection Laboratory Work Young’s Modulus Poisson’s Ratio UCS

Data Processing Rock Mass Rating (Bieniawski ‘89) Q Rating Statistical Analysis Kinematic Analysis (DIPS and ROCLAB from Rocscience Inc) Plane Failure Wedge Failure Toppling Failure

Input Parameters Laboratory Results Geotechnical Domains Water Table Soil Highly Weathered Saprolites Weathered Pyroxenites Fresh Pyroxenites Water Table Taken at 0.5m below surface Rock Mass Ratings Uniaxial compressive strength of rock material Rock quality designation (RQD) Spacing of discontinuities Condition of discontinuities Groundwater conditions Orientation of discontinuities

Input Parameters Joint Orientations (DIPS) Support Circular failure Plane failure Wedge failure Toppling Support

Numerical modelling ROCLAB DIPS Flac – Slope 5.0

Results Factor of Safety (FOS)

Results Factor of Safety (FOS) ROCLAB

Results Factor of Safety (FOS) ROCLAB Bench Face Angle (BFA) from Flac / Slope Soil Weathered Saprolite Weathered Pyroxenite Fresh Pyroxenite

Results – BFA Soil

Results – BFA Saprolite

Results – BFA Weathered Pyroxenite

Results – BFA Fresh Pyroxenite

Results – Fresh Rock CFA Method The CFA analysis indicates the following: A BFA of 74º for the Highwall based on plane failure A BFA of 75º for the Sidewall based on plane failure A BFA of 64º for the Sidewall based on wedge failure

Results Factor of Safety (FOS) ROCLAB Bench Face Angle (BFA) from Flac / Slope Soil Weathered Saprolite Weathered Pyroxenite Fresh Pyroxenite Support

Support

Recommendations

Suggested Configurations Highwall Sidewalls

Actual Configuration

Questions ?