Geotechnical

Ground investigation & testing

• 🇳🇿CETANZ TG6 — Industry Best Practice Guideline for Performing Cone Penetration Testing (CPT) in New ZealandCETANZ · December 2021CETANZ's industry best-practice guideline (TG6) for performing cone penetration testing (CPT) in New Zealand, in accordance with ISO 22476-1.
• 🇳🇿Geotechnical Investigations Technical Specification (ACS210)Auckland Council · March 2023Auckland Council's technical specification (ACS210) for geotechnical investigations — trial pits, boreholes, geophysical investigation and laboratory testing to the NZGS ground-investigation specification.
• 🇳🇿Geotechnical Site Investigations Guidelines (Stratford)Stratford District Council · October 2021Stratford District Council's guidelines for geotechnical site investigations supporting building consents — natural-hazard and "good ground" considerations for consent applications.
• 🇳🇿Gregg CPT GuideGeotechnics / Gregg Drilling · December 2014The widely used Gregg (Robertson & Cabal) Guide to Cone Penetration Testing for geotechnical engineering — CPT interpretation, soil behaviour type and common correlations.
• 🇳🇿NZ Ground Investigation Specification — Preliminary and General (NZGS 0100)NZ Geotechnical Society (NZGS) · August 2022The "Preliminary and General" volume (NZGS_0100) of the NZ Ground Investigation Specification — the general contractual and procedural requirements for ground-investigation works.
• 🇳🇿NZ Ground Investigation Specification (Volumes 0–3)NZ Geotechnical Society (NZGS) · April 2016The NZ Ground Investigation Specification (Volumes 0–3) — a national standard specification for planning, procuring and carrying out geotechnical ground investigations, with commentary and guidance.
• 🇳🇿NZGS Specification for Ground InvestigationNZ Geotechnical Society (NZGS) · June 2022The NZGS ground investigations specification (NZGS_0200) — a national standard specification for carrying out geotechnical ground investigations.
• 🇳🇿NZGS Standard Specifications — Users GuideNZ Geotechnical Society (NZGS) · August 2022The NZGS Standard Specifications user guide (NZGS_0000) — how to use the suite of NZGS standard geotechnical specifications together.
• 🇳🇿NZGS Static Settlement Reference PosterNZ Geotechnical Society (NZGS)An NZGS "geotechnical engineering basics" reference poster on static settlement — a rough-guide summary of settlement assessment for young geotechnical professionals.
• 🇳🇿Practice Advisory 17 — Well-Planned Ground InvestigationsMinistry of Business, Innovation & Employment (MBIE) · June 2016MBIE Practice Advisory 17 — why well-planned, site-specific geotechnical investigations save cost and lead to better foundation performance.
• 🇳🇿Seismic CPT in Strong SoilsNatural Hazards Commission · May 2000An EQC-funded GNS Science research report on using seismic cone penetration testing (SCPT) in strong soils to measure shear-wave velocity for site characterisation.
• 🇳🇿Soil Expansivity in the Auckland Region (BRANZ SR120)BRANZ · 2003A BRANZ study report assessing the expansivity of soils at eight Auckland sites and the applicability of the AS 2870 design method for houses built to NZS 3604.
• 🇳🇿Verification of Soil Bearing Capacity (Information Sheet 11)Wairoa District Council · October 2020A Wairoa District Council information sheet on verifying soil bearing capacity for building consents — the NZS 3604 "good ground" requirement (300 kPa ultimate) and what to do when it is not met.