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Christchurch Town Hall for Performing Arts Post earthquake and foundation repair assessment August 2013.

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Presentation on theme: "Christchurch Town Hall for Performing Arts Post earthquake and foundation repair assessment August 2013."— Presentation transcript:

1 Christchurch Town Hall for Performing Arts Post earthquake and foundation repair assessment August 2013

2 22 February 2011 – what happened??

3 Design approach… Engineers are expected to design structures for two main states: –Serviceability Limit State (SLS) - buildings are designed so that they suffer very little or no damage; –Ultimate Limit State (ULS) – buildings remain standing; people are able to safely leave the building. The building may be seriously damaged. 100% NBS = 100% of New Building Standard (Code)

4 Geotechnical investigation location plan

5 Generalised subsurface profile (Section 1) Lenses liquefiable in ULS event Lenses liquefiable in SLS event, Liquefiable in ULS event Lenses liquefiable in ULS event

6 What can we do to repair the building foundations?? Narrowed down to two proposed options: –Preferred option Jet grout columns with a thick concrete raft slab; or, –Alternative option Large diameter bored piles around the perimeter of the buildings with small diameter micropiles beneath the complex. An experienced specialist sub-contractor to the main contractor is required.

7 Seismic Performance Jet GroutPiles Liquefaction in ULS eventLess over the soil layersMore in each soil layer Lateral spreadingApprox. 50mm75 to 150mm Differential settlement Total100mm30mm Differential75mm30mm

8 Jet Grout columns with thick concrete raft slab Source: WAM (Aug 2013) Christchurch Town Hall – CCC Workshop Final Report (Rev A)

9 Jet Grout columns with thick concrete raft slab Source: WAM (Aug 2013) Christchurch Town Hall – CCC Workshop Final Report (Rev A)

10 Jet Grout columns with thick concrete raft slab NZ experience: –Jet grout operations beneath a several buildings in Christchurch has been undertaken. Details are not available due to insurance/ building owners preference. Worldwide experience: –A number of existing buildings, gas and oil tank facilities have had jet grout columns installed underneath them eg San Francisco Museum of Modern Art ($365 Million upgrade project)

11 END


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