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Research papers, University of Canterbury Library

This is an interim report from the research study performed within the NHRP Research Project “Impacts of soil liquefaction on land, buildings and buried pipe networks: geotechnical evaluation and design, Project 3: Seismic assessment and design of pipe networks in liquefiable soils”. The work presented herein is a continuation of the comprehensive study on the impacts of Christchurch earthquakes on the buried pipe networks presented in Cubrinovski et al. (2011). This report summarises the performance of Christchurch City’s potable water, waste water and road networks through the 2010-2011 Canterbury Earthquake Sequence (CES), and particularly focuses on the potable water network. It combines evidence based on comprehensive and well-documented data on the damage to the water network, detailed observations and interpretation of liquefaction-induced land damage, records and interpretations of ground motion characteristics induced by the Canterbury earthquakes, for a network analysis and pipeline performance evaluation using a GIS platform. The study addresses a range of issues relevant in the assessment of buried networks in areas affected by strong earthquakes and soil liquefaction. It discusses performance of different pipe materials (modern flexible pipelines and older brittle pipelines) including effects of pipe diameters, fittings and pipeline components/details, trench backfill characteristics, and severity of liquefaction. Detailed breakdown of key factors contributing to the damage to buried pipes is given with reference to the above and other relevant parameters. Particular attention is given to the interpretation, analysis and modelling of liquefaction effects on the damage and performance of the buried pipe networks. Clear link between liquefaction severity and damage rate for the pipeline has been observed with an increasing damage rate seen with increasing liquefaction severity. The approach taken here was to correlate the pipeline damage to LRI (Liquefaction Resistance Index, newly developed parameter in Cubrinovski et al., 2011) which represents a direct measure for the soil resistance to liquefaction while accounting for the seismic demand through PGA. Key quality of the adopted approach is that it provides a general methodology that in conjunction with conventional methods for liquefaction evaluation can be applied elsewhere in New Zealand and internationally. Preliminary correlations between pipeline damage (breaks km-1), liquefaction resistance (LRI) and seismic demand (PGA) have been developed for AC pipes, as an example. Such correlations can be directly used in the design and assessment of pipes in seismic areas both in liquefiable and non-liquefiable areas. Preliminary findings on the key factors for the damage to the potable water pipe network and established empirical correlations are presented including an overview of the damage to the waste water and road networks but with substantially less detail. A comprehensive summary of the damage data on the buried pipelines is given in a series of appendices.

Articles, Christchurch uncovered

Today for your viewing pleasure, we present a selection of interesting, unusual and aesthetically pleasing ceramics from Christchurch sites. Enjoy! Jessie Garland References Adamson, J. & Bader, H-D. 2008. Archaeological Excavation Report on the Street Homestead, Penrod Drive, Bell Block, &#8...

Articles, UC QuakeStudies

A copy of a letter from Hugo Kristinsson which was sent to Prince William, the Duke of Cambridge, on 2 March 2014 . The letter was sent on behalf of Empowered Christchurch, as a response to the letter read by the Prince at the official Civic Memorial Service on the 22 February 2014. Kristinsson thanks the Prince for his letter and updates him on the progress of the rebuild. He expresses his respect for King George VI and Queen Elizabeth for their compassion in the early 1940s to the victims of bombing raids during the war and acknowledge's Prince William and Prince Harry's philanthropy through The Royal Foundation of the Duke and Duchess of Cambridge and Prince Harry and The Princes' Charities Forum. Lastly he implores the Prince and the Duchess of Cambridge to visit residents from the 'low-lying seaside side of the city' who 'feel that their plight has been trivialised by the authorities in favour of prestigious big-budget projects'.

Research papers, University of Canterbury Library

The Canterbury earthquakes, which involved widespread damage in the February 2011 event and ongoing aftershocks near the Christchurch central business district (CBD), presented decision-makers with many recovery challenges. This paper identifies major government decisions, challenges, and lessons in the early recovery of Christchurch based on 23 key-informant interviews conducted 15 months after the February 2011 earthquake. It then focuses on one of the most important decisions – maintaining the cordon around the heavily damaged CBD – and investigates its impacts. The cordon displaced 50,000 central city jobs, raised questions about (and provided new opportunities for) the long-term viability of downtown, influenced the number and practice of building demolitions, and affected debris management; despite being associated with substantial losses, the cordon was commonly viewed as necessary, and provided some benefits in facilitating recovery. Management of the cordon poses important lessons for planning for catastrophic urban earthquakes around the world.

Articles, Christchurch uncovered

Continuing on from our last FAQ post, here are the answers to a few more of the questions we face regularly here in Christchurch. 1)      Are you doing this for a school project? Yes, seriously. This gets asked more often … Continue reading →

Articles, UC QuakeStudies

A document outlining the methodology for rebuilding horizontal infrastructure in the central city, covering wastewater (local reticulation and trunk), wastewater pump stations, storm water (local reticulation and trunk), potable water, roads, and bridges.