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Global Stability Analysis of Keystone wall - Aldington Road
Earth Retaining Structures
Discipline
ESR Australia
CUSTOMER
Kemps Creek
Location
Challenge
Analyse a Keystone segmental retaining wall system with a max height of 3.8 m , while accommodating high live and dead loads on the the wall face, silty clay foundation conditions, and the need for global stability in an area with limited geotechnical data.
Solution
We performed detailed global stability analysis by modeling multiple surcharge and embedment scenarios and trimmed the embedment depth from 1.33 m to 1.0 m. Less excavation, lower cost, same safety margin (FOS) > 1.5.
Key Highlights
Keystone Compac II wall, 249 m² total area, 3.8 m max height
Live (20 kPa) and dead (5 kPa) loads accounted for with 0.6 m offset
Global stability assessment confirmed FOS > 1.5
GX60/30 and GX 80/40 geogrids used with optimized 1.0 m embedment for cost efficiency
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