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CETANZ best practice for CPT testing in NZ

CETANZ best practice for CPT testing in NZ

ABSTRACT Cone Penetration Testing (CPT) is commonly used in routine geotechnical investigations throughout NZ. It provides a valuable resource for the geotechnical profession. However, different contractors undertake CPT testing in slightly different ways, and they may not necessarily follow recognised international standards for the test….

Direct design of driven timber piles using CPT: A case study

Direct design of driven timber piles using CPT: A case study

ABSTRACT Driven timber piles are a common pile type used in New Zealand. Established direct design methods from CPT, such as the LCPC method (Bustamante and Gianeselli, 1982), do not include driven timber piles as a specific pile type in those methods. In this study,…

Design of pump station foundations by numerical modelling – Part 2

Design of pump station foundations by numerical modelling – Part 2

  ABSTRACT The Jeffreys water supply pump station comprises replacement of the earthquake-damaged 200m3 concrete suction tank with a new 500m3 tank. Ground conditions at the site predominately comprise interbedded alluvial silt and sand in the surficial 8.75m, underlain by dense sandy gravel. Surficial soils…

Typical values of the CPT cone factor, Nkt, in Auckland clays

Typical values of the CPT cone factor, Nkt, in Auckland clays

Abstract The near surface geology of the Auckland area generally comprises alluvial soils, volcanic tuff/ash and/or residual soils. These soils may be expected to display different engineering characteristics given their different geological origins. The soils are mostly cohesive and the undrained shear strength, su, is…

Evaluation of liquefaction and re-liquefaction observed in Christchurch using CPT data

Evaluation of liquefaction and re-liquefaction observed in Christchurch using CPT data

The Canterbury region experienced widespread damage due to liquefaction induced by seismic shaking during the 4 September 2010 earthquake and the large aftershocks that followed, notably those that occurred on 22 February, 13 June and 23 December 2011. Following the 2010 earthquake, EQC directed a thorough investigation of…