Civil Engineering April 2021 | Vol 29 No 3

Civil Engineering April 2021 29 the determination of Young’s modulus and Poisson’s ratio, basic friction angle tests on saw cut joints, petrographic and x-ray diffraction analyses, slake durability and Duncan swell index tests. SLOPE DESIGN The data obtained from the geotechnical investigation was subjected to rock mass classifications, which in turn were used to inform deterministic kinematic assessments, 2D limit equilibrium (LE) and finite ele- ment (FE) analyses, rockfall analyses and various probabilistic assessments. These analyses were primarily conducted utilising Rocscience’s and Midas’ suites of software. Figure 3 (a) 3D terrestrial laser scanning of mining slopes, (b) laser scanned point cloud data of mining slope showing bedding traces (with permission from Maptek), (c) rotary core drilling in progress, (d) down-hole borehole survey in progress, (e) typical down-hole survey log, (f) stereonet presenting poles of main joint sets N S W E Equal Area Lower Hemisphere 650 Poles 650 Entries Poles NGAM Depth TIMM AMPM OTVM PIKT CALI GammaRay 1m:50m Time ReflectedAmplitude Photographic Image StructureswrtTN Three-ArmCaliper API MM 0° 90° 180° 270 60° 0 60 170 70 0°90°180°27060° 0 300 2 3 4 5 6 7 AllEvents Polar Plot Rose Diagram Bedding Azimuth–Percent Interval (Count) SchmidtPlot–LH–WWSStandard AZIV AzimuthVectorPlot VectorAzimuth (Base toTop)–WWSStandard (e) Legend:  NGAM:Totalnaturalgamma ray, CALI:Three-armcaliper, TIMM:Sonic travel time, AMPM:Sonic reflectionamplitude,  OTVM:Optical image PIKM:StructuresPickedanClassifiedwrtMagneticNorth, PIKT:StructuresPickedandClassifiedwrtTrueNorth,  RoseDiagram:SumofAzimuthsatHorizontal Plot:SchmidtPlot,EqualArea, AZIV:AzimuthVectorPlot, TILT:Borehole tilt fromvertical, AZIM:Boreholeazimuth frommagneticnorth 0° 90° 180° 270 60° (f) (a) (b) (c) (d)