Blog Archiv1es

Vacuum Consolidation of Soft Clay via Vertical Drains

In many countries, the majority of population lives along the coast, which contains soft soil deposits that require ground improvement. Loose sandy soils and soft compressible clays are very common along the coastal regions. The use of vertical drains with vacuum preloading is considered as the most effective and economical method for improving soft clays …more

Posted in 2008 Meetings, Meeting, Sydney |

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

Posted in 2009 Meetings, Meeting, Sydney |

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

Posted in 2009 Meetings, Meeting, Sydney |

Symposium: Geosynthetics: New materials for modern infrastructure

Posted in 2009 Meetings, Meeting, Sydney |

YGP Night

Posted in 2009 Meetings, Meeting, Sydney |

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

Posted in 2009 Meetings, Meeting, Sydney |

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

Posted in 2009 Meetings, Meeting, Sydney |

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

Posted in 2009 Meetings, Meeting, Sydney |

Northern Hume Alliance: An Example of Integrated Geotechnical Design and Construction

The Northern Hume Alliance (NHA) is an alliance between five organisations charged with upgrading the Hume Highway to a four lane highway between the Sturt Highway intersection (north of Tarcutta) and the township of Holbrook. The participants in the NHA include the NSW Roads and Traffic Authority, Leighton Contractors, Maunsell, SMEC and Coffey. The works …more

Posted in 2009 Meetings, Meeting, Sydney |

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

Posted in 2009 Meetings, Meeting, Sydney |

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

Posted in 2009 Meetings, Meeting, Sydney |

Palmers Road Landslide: Investigation, Analysis & Remediation

Slope instability is a relatively common occurrence in the Gosford – Lake Macquarie – Newcastle area. The occurrence of landslides and their mechanisms are determined by the geology and hydro-geology of the various regions and care must be taken to understand this regional context when investigating and designing engineering works. In June 2008 a routine …more

Posted in 2010 Meetings, Meeting, Sydney |

50th Rankine Lecture: Stiffness at Small Strain- Research and Practice

The rapid development of computing power and of numerical modelling software over the past forty years has made sophisticated analysis of geotechnical problems accessible to most practising engineers. Typically computer packages now offer a wide range of constitutive models, which the design engineer needs to choose between, and then obtain parameters for. For those structures …more

Posted in 2010 Meetings, Meeting, Sydney |

Seismic Engineering – Design for Management of Geomechanics

Posted in 2010 Meetings, Meeting, Sydney |

Young Geotechnical Professional’s Night

Ana Heitor: Characterisation of Compacted Soil Using Shear Wave Velocity Field compaction testing is widely undertaken using nuclear density meters. Due to its localized nature however, the method is limited in assessment over larger depths and wider surface areas. Only a few studies have evaluated compacted soil behaviour under unsaturated conditions using alternative non-destructive testing, namely …more

Posted in 2010 Meetings, Meeting, Sydney |

Rock Mass Characterization: a vehicle to translate geology into the design of engineering structures

Since the attempt by Terzaghi in 1946 to describe the characteristics of rock masses, numerous rock mass classifications have been developed. Hoek and Brown (1980) set out to develop a failure criterion and a classification system, the Geological Strength Index (GSI), specifically for the purpose of designing tunnels, slopes or foundations in rocks. Here the …more

Posted in 2010 Meetings, Meeting, Sydney |

Highly Constrained Railway Widening Project within a Previously Unrecorded Diatreme at Hornsby, NSW

As part of the NSW Government’s Rail Clearways Program, GHD Geotechnics was the detail designer for the Hornsby Platform 5 and Stabling Project that was highly commended at the 2009 Engineering Excellence Awards. This case study relates to the widening of an existing railway embankment that is over 100 years old, under live rail traffic, …more

Posted in 2010 Meetings, Meeting, Sydney |

Next Generation of Unsealed Roads

Low volume rural roads are typically unsealed roads and numerous Australian and international studies have been carried out to improve their durability and reduce dust. New products and equipment have been produced and tested, and unfortunately many of these new products are typical promoted by the so called ‘snake oil’ salesman. The goal of the …more

Posted in 2010 Meetings, Meeting, Sydney |

Concepts & Parameters Related to Ground Improvement Illustrated by Case Histories

The International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) Technical Committee on Ground Improvement, has proposed a classification system of ground improvement techniques according to the general nature of the soil, (frictional or cohesive) and the inclusion or not of added material (http://www.bbri.be/go/tc17). This classification system has been detailed in the state of the …more

Posted in 2010 Meetings, Meeting, Sydney |

Ipswich Motorway Upgrade, Dinmore to Goodna: Remediation of Abandoned Coalmines

At $2bn the Ipswich Motorway, D2G Upgrade southwest of Brisbane is the largest federally funded project in QLD. The 8km section of road, Queensland’s busiest, crosses three abandoned coal mines worked at various times between the late 1800s and the 1980s. Following investigation and analysis of the stability of each of the mines the decision …more

Posted in 2010 Meetings, Meeting, Sydney |