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Project Profile Z13 Z230

School Building Foundations Strengthened

Sub-industry
Public Buildings
Problems
Earthquake Remediation
Location
Christchurch, NZ
Year
2014
Solutions
Ground Improvement
Technology

School Building Foundations Strengthened

Summary

This 2-storey structure of mostly tilt slab construction had suffered earthquake liquefaction and subsidence.

Jet Grouting was used to strengthen the foundation ground to provide a stronger and more stable base for subsequent void filling and improvements to the footings.

This way the school building was provided with much greater resistance to future possible earthquakes.

Objectives

To greatly strengthen the entire foundation of the building to provide the building with a deep-soil reaction matrix and minimise the potential for future liquefaction that might cause subsidence and /or damage the structure.

Solution

Across the building footprint of 40x12m we installed 22 jet grout columns, all 2.4m in diameter with start (toe) depths ranging from 3.2m to 4.5m.

The columns were varied in height from 2.5m to 3.8m. These columns are a mix of cementitious grout and in-situ soil.

There were finished 0.7m below ground level for subsequent connection to the existing footings of the building.

The total Mainmark project took 21 days with actual column installation taking eight days.

The school’s engineers judged that the Jet Grouting had “significantly reduced the chance of liquefaction or settlement of this building in future earthquakes.

Resources

Download a pdf version of this project here

School Building Foundations Strengthened
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