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Crib Wall Failure Investigation and Keystone Remediation
Discipline
Goodman
CUSTOMER
Sydney West, NSW
Location
Challenge
An existing crib wall in Sydney's west had failed twice, with the second event collapsing a roughly 15 m section of wall. A permanent remediation was needed to restore the embankment.
Solution
Our investigation found the wall was under-designed, made worse by trapped groundwater. We designed a replacement: a 6 m Keystone wall with 13 geogrid layers and new subsurface drainage to remove the water pressure for good.
Key Highlights
- Investigation found the original wall under-designed, worsened by groundwater pressure
- New 6 m Keystone wall with 13 layers of geogrid reinforcement
- Verified stable under static and seismic loading, FOS up to 1.67
- New subsurface drainage system permanently removes the groundwater pressure
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