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A 3D Geological Model of the Whakatane Central Business

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A 3D Geological Model of the Whakatane Central Business DISCLAIMER This report has been prepared by the Institute of Geological and Nuclear Sciences Limited (GNS Science) exclusively for and under contract to Whakatane District Council. Unless otherwise agreed in writing by GNS Science, GNS Science accepts no responsibility for any use of or reliance on any contents of this report by any person other than Whakatane District Council and shall not be liable to any person other than Whakatane District Council, on any ground, for any loss, damage or expense arising from such use or reliance. Use of Data: Date that GNS Science can use associated data: 30 June 2015 BIBLIOGRAPHIC REFERENCE Begg, J.G; Lukovic, B.; Beetham, R.D.; Nikolaison, H.N. 2015. A 3D Geological Model of the Whakatane Central Business District, Bay of Plenty, New Zealand – with estimate maps illustrating possible earthquake land damage, GNS Science Consultancy Report 2015/30. 53 p. Project Number 44000905 Confidential 2015 CONTENTS EXECUTIVE SUMMARY ...................................................................................................... IV 1.0 INTRODUCTION ........................................................................................................ 1 1.1 AREA OF INTEREST AND RATIONALE FOR THIS WORK ............................................ 1 2.0 GEOMORPHOLOGY AND GEOLOGICAL SETTING ................................................ 3 2.1 GEOMORPHOLOGY ............................................................................................ 3 2.2 GEOLOGICAL SETTING ....................................................................................... 5 2.3 PURPOSE OF THIS STUDY ................................................................................... 6 3.0 SUMMARY OF SUBSURFACE MODELLING INFORMATION .................................. 7 4.0 ENGINEERING USE OF SUB-SURFACE DATA ....................................................... 9 4.1 ANALYSES OF CPT DATA ................................................................................. 10 4.2 RESULTS OF THE TC ZONING ........................................................................... 15 4.3 A WHAKATANE GEOTECHNICAL DATABASE AVAILABLE FOR ALL TO USE ............... 16 5.0 DISCUSSION AND CONCLUSION .......................................................................... 17 5.1 QUALITY ASSURANCE ...................................................................................... 21 6.0 RECOMMENDATIONS FOR FURTHER WORK ...................................................... 23 7.0 ACKNOWLEDGEMENTS ......................................................................................... 25 8.0 REFERENCES ......................................................................................................... 27 FIGURES Figure 1 Geomorphology of the eastern Rangitaiki Plains. ......................................................................... 3 Figure 2 Whakatane District Council archival map dated 1867 .................................................................. 4 Figure 3 A map grid approximating settlement in an SLS earthquake ...................................................... 14 Figure 4 A map grid approximating settlement in an ULS earthquake...................................................... 14 Figure 5 A map of the CBD area with CPT collars coloured according to LSN values ............................. 19 Figure 6 Whakatane CBD, viewed horizontally from the north ................................................................. 20 TABLES Table 1 Site subsoil classes as defined by NZS1170.5: 2004. .................................................................. 9 Table 2 Maximum depth limits for site subsoil class C. ............................................................................. 9 Table 3 Geotechnical site classification. .................................................................................................. 10 Table 4 MBIE Guidance Table 3.1, Index criteria for foundation technical categories............................. 11 Table 5 Location, collar elevation, depth, and ULS and SLA index settlements for all CPT’s used in the 3D ground model. ............................................................................................................. 12 Table 6 LSN values for Whakatane CBD CPTs derived from CLiq, set to parameters described in Appendix 1, for an earthquake magnitude M7, with peak ground acceleration of 0.3 g, and with groundwater depth set at a consistent 1 m depth......................................................... 18 GNS Science Consultancy Report 2015/30 i Confidential 2015 APPENDICES A1.0 DATA AND MODELLING METHODS ...................................................................... 31 A1.1 DRILLING AND CPT INVESTIGATION DATA .......................................................... 31 A1.2 METHOD ......................................................................................................... 31 A1.3 CPT DATA....................................................................................................... 32 A1.4 DRILLHOLE DATA ............................................................................................. 33 A1.5 TOPOGRAPHY ................................................................................................. 35 A1.6 COMPARISON OF CLOSELY SITED DRILLHOLES AND CPTS .................................. 36 A1.7 BUILDING A GROUNDWATER SURFACE ............................................................... 37 A1.8 IDENTIFYING AND BUILDING SURFACES REPRESENTING CORRELATIVE HORIZONS ..... 38 A1.9 BUILDING 3D GEOLOGICAL MODEL VOLUMES ..................................................... 39 A1.10 BUILDING 3D INTERPOLATED GEOTECHNICAL MODELS ....................................... 41 A1.11 DEFINING A POTENTIALLY LIQUEFIABLE VOLUME ................................................ 42 A1.12 LEAPFROG GEO PROJECT ................................................................................ 42 A1.13 RELIABILITY OF THE GEOLOGICAL AND GEOTECHNICAL MODELS ......................... 45 A1.14 RELIABILITY OF THE UNCONFINED GROUNDWATER SURFACE MODEL ................... 47 A1.15 LIMITATIONS .................................................................................................... 47 A2.0 WHAKATANE CBD LEAPFROG VIEWER PROJECT ............................................. 49 A2.1 EXPLANATION ................................................................................................. 49 ii GNS Science Consultancy Report 2015/30 Confidential 2015 APPENDIX FIGURES Figure A1 The Whakatane CBD model area, viewed horizontally from the north, illustrating the unconfined groundwater surface as modelled. ........................................................................... 37 Figure A2 The Whakatane CBD viewed horizontally from the north, illustrating the sub-horizontal surface modelled between fine-grained materials (mostly silt) close to the surface. .................. 38 Figure A3 The Whakatane CBD viewed horizontally from the north, illustrating the gently north- dipping surface between sand-dominated material and underlying silt and silty sand. ............... 39 Figure A4 Whakatane CBD viewed horizontally from the north, illustrating the modelled gravel/shellbed lenses. ............................................................................................................... 40 Figure A5 A slice of the Ic Geotechnical Model orientated east (left) to west (right) close to along Pohutu Street. ............................................................................................................................ 42 Figure A6 A map illustrating the distribution of CPT (yellow points) and drillhole (red points) collars across the area of interest. ......................................................................................................... 45 Figure A7 In comparison with the surface data density (Figure A6), these horizontal slices within the Geological Model demonstrating its drop-off with depth. ...................................................... 46 APPENDIX TABLES Table A1 Attribute fields in CPT point data table. ...................................................................................... 32 Table A2 Attribute fields in CPT_Collar point data table. ........................................................................... 33 Table A3 Attribute fields in collar drillhole table. ........................................................................................ 33 Table A4 Attribute fields in survey drillhole table. ...................................................................................... 34 Table A5 Attribute fields in drillhole log table. ............................................................................................ 34 Table A6 Attribute fields in SPT table. ....................................................................................................... 35 Table A7 Attribute fields in GW table. ........................................................................................................ 35 Table A8 Identification of drillholes and CPT collars within 15 m of each other. ........................................ 36 Table A9 Interpolant structural trends. ....................................................................................................... 41 Table A10 Leapfrog Geo Project Table of Contents. ................................................................................... 43 GNS Science Consultancy Report
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