Monograph GAT-2024-01 • AS 2870 Methodology
Quantifying Characteristic Surface Movement (ys) in Reactive Clays
An in-depth analysis of the shrink-swell index (Iss) and suction change depth (Hs) formulations specified in Australian Standard AS 2870-2011. The paper contrasts core shrinkage test data with seasonal suction profiles across Southeast Queensland catchments.
Key Citations: AS 2870-2011 Cl 2.3; Cameron, D.A. (1989) 'Suction profiles in Australian soils'; Fityus, S.G. (2004) 'Reactivity of expansive soil profiles'.
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Monograph GAT-2024-02 • Subgrade Mechanics
Dynamic Cone Penetrometer (DCP) Correlations for Pavement Subgrades
Evaluation of empirical relationships between blows per 100mm in Perth/Scala DCP testing and laboratory 4-day soaked California Bearing Ratio (CBR) values in alluvial silts and fine sands. Provides safety boundary envelopes for residential subgrade approvals.
Key Citations: AS 1289.6.3.2; Austroads (2017) 'Pavement Structural Design Guide'; Look, B.G. (2014) 'Handbook of Geotechnical Investigation'.
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Monograph GAT-2023-04 • Slope Stability
Geotechnical Risk Management on Weathered Basalt Slopes
Investigation into pore-water pressure spikes and residual shear strength parameters within colluvial soils overlaying weathered basalt bedrock in Queensland escarpment zones. Covers limit-equilibrium analysis (Bishop / Morgenstern-Price) and drainage interceptors.
Key Citations: Australian Geomechanics Society (AGS 2007) 'Landslide Risk Management Guidelines'; AS 4678:2002 'Earth-Retaining Structures'.
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Monograph GAT-2023-01 • Deep Foundations
AS 2159 Deep Piling Design in Coastal Estuarine Strata
Structural assessment criteria for bored cast-in-place and driven precast displacement piles traversing soft estuarine muds into underlying sandstone or calcarenite rock. Focuses on geotechnical reduction factors (Φg) and negative skin friction.
Key Citations: AS 2159-2009 'Piling - Design and Installation'; Tomlinson, M. & Woodward, J. (2014) 'Pile Design and Construction Practice'.
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