2009 Meetings

Performance Based Aseismic Design of Rigid Retaining Walls

Retaining walls have failed either by sliding or by a combined action of sliding and rocking displacements during earthquakes. Performance Based Design of the retaining walls in seismic areas must account for these displacements, in addition to the usual factors of safety against failure in bearing, sliding and overturning. A realistic model for estimating dynamic …more

The 2009 Terzaghi Lecture: “Uncertain Geotechnical Truth and Cost-Effective High-Rise Foundation Design”

The essential requirements for the design of foundations for the world’s tallest buildings, from a geotechnical perspective are presented. The basic types of foundation, special in-situ testing, and load testing techniques commonly used, and several key principles to remember including the need for close structural engineering and geotechnical engineer cooperation are discussed. Note that this …more

Geotechnical baseline reports as an underground risk management tool

The presentation will explore the nature of underground risk, and Singapore’s management of uncertainty and unforeseen conditions in recent underground work. This talk will look in particular at two projects, the 48km Deep Tunnel Sewerage System (DTSS) Project and the 5 km Marina Coastal Expressway (MCE). The projects have important similarities in their use of …more

Climate Change and the Challenges for Geotechnical Engineering

In this presentation climate change implications will be discussed by outlining a relationship between climate and reactive soil movements. The climate is defined in terms of the Thornthwaite Moisture Index (TMI) as used in AS 2870-1996 “Residential slabs and footings”. The yearly value of TMI determined for Adelaide, Melbourne and Sydney will be presented and …more

Ground Treatment at Kooragang Island

The Newcastle Coal Infrastructure Group (NCIG), a consortium of Hunter Valley mining companies, is building Stage 1 of a third Coal Export Terminal (CET3) on Kooragang Island, Newcastle, NSW. The project (~$1bil Capital Value) encompasses the construction of coal export facilities which includes a new 4.3km railway loop (with coal unloading station) that then delivers …more

Landslide Risk Management

The AGS (2000) “Landslide Risk Management Concepts and Guidelines” provided a significant change from AGS Sydney Group “Geotechnical Risk Associated with Hillside development” (Walker et al. 1985). AGS (2000) established a uniform terminology and a general framework for landslide risk management (LRM). Guidance was given on methods which should be used for landslide risk analysis …more

Soft Soil Engineering

Vacuum consolidation ground treatment has been used to facilitate timely construction of a road embankment on a 25m thick deposit of soft to firm estuarine clay. This was the first application of the vacuum consolidation technique in Australia. The vacuum consolidation technique is presented, a summary of its construction is provided and data during construction, …more