Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


UC engineering expert helping in Christchurch’s rebuild

UC engineering expert helping directly in Christchurch’s rebuild

December 4, 2012

University of Canterbury’s civil and natural resources engineer Professor, Misko Cubrinovski, is helping in the Christchurch rebuild by working with the Stronger Christchurch Infrastructure Rebuild Team (SCIRT) on repairing 2000 km of water mains and 2000 km of sub-mains.

His preliminary geo-spatial analysis of the damage data indicated that, on average, there was one break/fault per kilometre of damaged pipelines. Eighty percent of the damaged pipe networks were in soils that suffered liquefaction.

In addition, there are about 2000 km of wastewater pipes, of which nearly 700 km were either out of service or with limited service one month after the earthquake.

``We are continuing our collaboration and support of Christchurch City Council (CCC) and SCIRT engineers, designers and managers,’’ Professor Cubrinovski said.

`` We will pass our research outcomes to CCC and SCIRT in the course of the study and will continue to provide technical advice on a regular basis.

``Both the detail and the big picture are very important. Use of flexible pipe materials and joints that can accommodate large ground movements, trench and manhole details protecting the pipelines and minimising relative movements between the pipes and surrounding soils and many other engineering solutions that reduce damage and improve overall performance of the networks are required.

``However, this has to be achieved in a cost effective way and therefore we have to accept some damage, or even design the system to fail at a particular location where quick repair and reinstatement will be easily achievable.

``Large areas of Christchurch are susceptible to liquefaction of moderate to severe intensity. Since these networks are distributed across the city, their exposure to liquefaction hazards is very high.A robust and balanced approach is needed to provide an affordable system that will ensure good performance during earthquakes.

``This is well understood in CCC and SCIRT and there are many dedicated people who work very hard in achieving these goals. I have seen many excellent contributions and good stories of this nature, and UC is certainly making a very strong contribution in these efforts.’’

One of the projects Professor Cubrinovski led after the February 22 earthquake last year focused on the impacts of liquefaction on the potable water and wastewater systems of Christchurch. The project started in April last year and worked closely with a group of about 10 people from the CCC. The team started work on the rebuild even before SCIRT was established.

Before the earthquakes, very few people had any deep understanding of liquefaction and its impacts on infrastructure. The CCC and SCIRT engineers and Professor Cubrinovski had lengthy discussion about liquefaction, how it evolves during earthquakes, the resulting ground deformation and how it affects engineering structures and buried pipes in particular.

They discussed many details about the potable and wastewater pipe networks of Christchurch, for example, grading and density of backfills in trenches, characteristics of different pipe materials and connections.

There was an immediate need for CCC, and then SCIRT, to quickly start the reinstatement/recovery work on these lifelines and for that purpose they needed area-specific design criteria addressing liquefaction hazards. This, in turn, required zoning of Christchurch with respect to ground conditions and liquefaction susceptibility/severity.

``We quickly produced a so-called Liquefaction Resistance Index Map for Christchurch which identifies five different zones and for each zone specifies parameters (such as ground strains and displacements) that are used in the design of the networks. This map has been used as a principal tool by SCIRT engineers for preliminary screening in the design process.

``The map is unique because it provides back-calculated liquefaction resistance purely based on observations of manifested liquefaction and recorded ground motions. This is invaluable information because it synthesises all the complexities and specific characteristics of our soils and their response during actual earthquakes,’’ he said.

ends

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell: On First Time Voting (Greens)

For the last two days, I’ve turned my column over to a couple of guest columnists who are first time voters. They’ve been asked to explain why they were voting, for whom and what role they thought their parental upbringing had played in shaping their political beliefs ; and at the end, to choose a piece of music. Today’s guest columnist is Ana Avia-O’Connor, who will be casting her first time vote on Saturday for the Greens.

If I didn’t know any better, it would seem the world has conspired for me to be a Green Party voter. Parents, Green voters? Check. Participation in bilingual education that stressed the importance of inquiry, solidarity and the Treaty? Check. Some sort of vegetarian leanings (seven years and counting, jus’ sayin’)? Check. However, above all of that, I’m voting Green because I believe in supporting the importance of every New Zealander’s contribution to Aotearoa, from the hairdresser in Foxton to the fisherman in Bluff. You could say that I like the cut of the Greens’ jib. More>>

 

Parliament Today:

Big March: Call For An End To Domestic Violence

Hundreds of protesters marched down Lambton Quay to Parliament Monday calling for an end to domestic violence. Wearing white facemasks, waving banners and calling for “safety” for the women and children of New Zealand.. More>>

ALSO:

Meddling: Aussie Liberals Embroiled In Key Campaign

John Key needs to explain why Australia’s Liberal Party is interfering in New Zealand domestic politics and is encouraging Kiwi voters across the ditch to vote for National just days out from the election, Labour’s campaign spokesperson Annette King says. More>>

ALSO:

SURVEILLANCE:

Election Ad Soundtrack: Rapper Eminem Sues National Party Over Copyright Breach

US rapper Eminem is suing the New Zealand National Party for alleged copyright infringement over unauthorised use of the rapper’s ‘Lose Yourself’ song in an election campaign advertisement. More>>

ALSO:

Pre-Election Chartering: Four New Partnership Schools To Open

Education Minister Hekia Parata today announced the Government has signed contracts to open four new Partnership Schools in 2015. More>>

ALSO:

Werewolf 50 Out Now - The Election Issue: Loss Leaders

Gordon Campbell: A third term requires a mature decision, with eyes wide open. It calls for a conscious vote of confidence… Without trying hard here are about 19 reasons, in no particular order, for not ticking ‘party vote’ National. More>>

ALSO:

Not-Especially New Plans: All Prisons To Become Working Prisons Under National

All public prisons in New Zealand will become full working prisons by 2017, and ex-prisoners will receive post-release drug addiction treatment if National is returned to government, says Corrections Spokesperson Anne Tolley. More>>

ALSO:

Māngere: "False Claim Of Matai Title" - Labour

National must explain why its candidate for Māngere Misa Fia Turner appears to be using a Matai title she is not entitled to, Labour’s MP for Māngere and Pacific Islands Affairs spokesperson Su’a William Sio says. A Matai title is a legally-recognised ... More>>

ALSO:

CPAG Report: No New Zealand Child Should Grow Up In Poverty

Child Poverty Action Group's flagship policy publication Our Children, Our Choice: Priorities for Policy calls for cross party political agreement to underpin an action plan to eliminate child poverty in New Zealand. More>>

ALSO:

Gordon Campbell:
On National’s Phantom Tax Cut Package

Hmmm. So National’s tax cuts package turns out to be one of those television advertisements that screams a headline promise – perfect skin! a youth tonic that works! – while in very small print there’s an out clause: special conditions may apply. More>>

ALSO:

Water: New Marine Reserves On West Coast Opened

Five new marine reserves were officially opened by Conservation Minister Dr Nick Smith on the West Coast of the South Island to protect a range of marine ecosystems for conservation, science and recreation. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news