Cyclone Gabrielle: Landslide Response and Recovery
1st August 2023 Presenters: Liam Wotherspoon, Chris Massey and Kerry Leith
Author
Providing robust Vs30 estimates for seismic site classification in New Zealand
Abstract The recent update to the National Seismic Hazard Model has changed the approach to seismic site classification in New Zealand, with the time-averaged shear wave velocity over the top 30 m of the subsurface profile (VS30) at a site now being a key site…
Applicability of empirical SPT-CPT correlations for New Zealand soils
ABSTRACT Using a database of 230 co-located cone penetration tests (CPT) and boreholes with standard penetration tests (SPT) from sites across Christchurch, New Zealand, this paper assesses the applicability of a range of existing SPT-CPT correlations from international studies. Both simple linear CPT-SPT relationships…
Assessing the quality and uncertainty of in-situ seismic investigation methods
ABSTRACT Design in New Zealand is increasingly requiring parameters obtained from in-situ seismic testing for use in modelling and assessment of the built environment. In New Zealand shear wave velocity (VS) profiles are most commonly required. However, the quality of in-situ seismic testing can…
Regional Geotechnical and Geophysical Site Characterisation across New Zealand
This presentation will provide an overview of the regional geotechnical and geophysical site investigation studies that have recently been carried out across New Zealand, with a focus on improving our understanding of sedimentary basin structures and the shear wave velocity of regional soil deposits. The…
Understanding shoreline change and sea-level rise: what it means for adaptation of coastal infrastructure
1. Introduction Coastal communities globally face the unprecedented task of adapting to elevated coastal hazard risk under changing environmental conditions, including sea-level rise. Sea-level rise will continue for centuries, and while the rate of future sea-level rise is uncertain, there will undoubtedly be an increase…
Development of an Empirical Correlation for Predicting Shear Wave Velocity of Christchurch Soils from Cone Penetration Test Data
Abstract Following the companion study of McGann et al. [1], seismic piezocone (SCPTu) data compiled from sites in Christchurch, New Zealand area are used with multiple linear regression to develop a Christchurch-specific empirical correlation for use in predicting soil shear wave velocities, Vs, from cone…
Cross-Checking Liquefaction Hazard Assessments with Liquefaction Observations from New Zealand Earthquakes and Paleo-liquefaction Trenching
Abstract Liquefaction has been reported following upwards of 13 recent and historical earthquakes in New Zealand. Collating reports outlining the extents of liquefaction manifestation following these events provides insights into the distributions of sediments with low cyclic resistances to liquefaction, and enables liquefaction hazard assessments…
Case study in the use of shear wave velocity techniques to investigate liquefaction potential of Waikato soils for the Hamilton section of the Waikato expressway
Abstract The four-lane, 21.8 kilometre long, Hamilton Section of the Waikato Expressway is the largest roading project undertaken in this region’s history and one of the larger projects currently being undertaken in New Zealand. Many of the seventeen expressway bridges in the Hamilton Section are…
Modelling of single pile-soil interaction using Ruaumoko
A model was developed to represent single piles embedded in cohesive soil deposits using the Ruaumoko analysis program, utilizing the available capabilities and modifications of existing elements. The non-linearity of both the soil and the pile was able to be represented within the model in order…