Blog Archiv1es

A Practical Guide to Abandoned Mine Subsidence Assessment and Mitigation

Mine subsidence can take the form of sinkholes or troughs depending on mining and geologic conditions. Examples of the geology, mining, and subsidence features encountered in core and on the surface from US Bituminous Coal fields, particularly in the widely mined Pittsburgh Coal Seam; the Anthracite Coal field of north-eastern Pennsylvania; and the Sydney Basin, …more

Posted in 2010 Meetings, Meeting, Sydney |

The NSW Research Award: Advanced research in Geotechnical Engineering

Ali Ghandeharioon: Analytical and Numerical Studying of Disturbance and Pore Pressure in Soft Cohesive Soils Associated with the Installation of Mandrel-driven Prefabricated Vertical Drains This research investigates the installation of mandrel-driven PVDs and the associated disturbance in cohesive soils using a novel elliptical cavity expansion theory validated by laboratory experiments and numerical modelling. The pattern of …more

Posted in 2010 Meetings, Meeting, Sydney |

E.H. Davis Memorial Lecture: Recent Advances in the Application of Vertical Drains and Vacuum Preloading in Soft Soil Stabilization

Over the past 15 years, Prof. Buddhima Indraratna and his co-workers have developed numerous experimental, analytical and numerical approaches that simulate the mechanics of prefabricated vertical drains (PVD) and vacuum preloading including both two-dimensional and three-dimensional analyses and more comprehensive design methods. This lecture presents an overview of the theoretical and practical developments and salient …more

Posted in 2010 Meetings, Meeting, Sydney |

The 2010 Poulos Lecture : Modelling of Erosion

Following the discovery of sinkholes in the WAC Bennett Dam, British Columbia, in 1996, investigations showed that there had apparently been movement of fine material out of the core of the dam. The internal erosion (suffusion) is caused by continuing slow seepage but the concern is for the long term mechanical consequences. In order to …more

Posted in 2010 Meetings, Meeting, Sydney |

Life on a Commune

Between the middle of 1995 and the middle of 1996, approximately 300 000 m3 of sediment was dredged from the Patawalonga Basin. The sediment was deposited in ponds along Tapleys Hill Road and the water drained from it. In July 1996 accelerated drainage measures were instituted which allowed the material to be removed from the …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Landslide Risk Assessment

Landslide hazard and risk assessments have been carried out by private practitioners and public bodies for many years. Recently there have been attempts to set up a more formal framework of risk assessment and management. Alan will explain the principles of landslide risk assessment and some of the common terms. He will illustrate the principles …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Adelaide AirportRunway Extension

This project involved the diversion of Tapley’s Hill Rd and the extension of the main runway of Adelaide airport to allow fully loaded 747 jets to take off and land. Discussed were: the site investigation techniques used and the test results obtained with particular emphasis on the very soft soils encountered in the bed of …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

The Holdfast Shores Development at Glenelg – Geotechnical Aspects – Onshore and Offshore

The development, currently under construction, includes large breakwaters to create a safe harbour for the Kangaroo Island fast ferry and new marina berths; about 150 apartments and penthouses; new hotel and tourist accommodation; a marina pier with restaurants, shops and taverns; a key; and a mixed recreational area. Completion of the project is scheduled for …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Art Gallery of SA – Deep Basement Construction

The presentation will cover the construction of the recently completed $26 million extensions to the Art Gallery of South Australia. Particular emphasis will be on the construction of the 10 m deep basement as redesigned to accommodate “top down” construction and the locally developed interlocking bored pile retaining wall technique. The key features to be …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Melbourne Crown Casino – Geotechnical Issues

The Melbourne Crown Casino, billed as one of the largest in the world, has been built on about a 6 hectare site on the south bank of the Yarra River in Melbourne. The $1.6 billion project includes 11 hectares of underground car parking, on two levels, theatres, gaming halls, restaurants and a 40 storey hotel. …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Annual Half-Day Seminar – Environmental Geomechanics

Speakers included: Roger Parker, Linton Johnston, Clive Jenkins, Michael Cannell, Alex Eadie, Alan Ockenden, James Begg, Dr Peter Mitchell Geoenvironmental practice in Australia Urban stormwater contaminants Heavy metals in the sediments of constructed wetlands: safely locked up or mobile and toxic? Instrumentation for environmental geomechanics Environmental auditing of contaminated land in SA Managing urban catchments …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Blanchetown Bridge Replacement – Geotechnical Investigation

Site work has started for the construction of a new bridge at Blanchetown. This bridge will be one of the biggest built in the state in recent times. A seismic study to provide information for the alignment of the new bridge was performed by Coffey Partners International. The geotechnical investigation for the new bridge was …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Tailings Management at Olympic Dam – Current Practises and Future Options

Tailings management at Olympic Dam involves the monitoring and control of solid and liquid components of the tailings slurry. Tailings slurry is deposited in thin layers using a spigot system from the perimeter of each cell. The solids settle onto the tailings beach whilst the supernatant liquor is collected from the centre of each cell. …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

The Re-Use of Sediment Drained from the Patawalonga

Between the middle of 1995 and the middle of 1996, approximately 300 000 m3 of sediment was dredged from the Patawalonga Basin. The sediment was deposited in ponds along Tapleys Hill Road and the water drained from it. In July 1996 accelerated drainage measures were instituted which allowed the material to be removed from the …more

Posted in 1997 Meetings, Meeting, South Australia and NT |

Annual visitors night: India – Roads and Life

Did you ever wonder why the Taj Mahal has lasted as long as it has? Did you ever wonder how they build roads in India? In this seminar Bob regaled us with pictures and words of his recent trip to the subcontinent where he went to exchange knowledge on the intricacies of road building, and …more

Posted in 1998 Meetings, Meeting, South Australia and NT |

Construction of the Blanchetown Bridge

Construction of the new bridge at Blanchetown is nearly complete. The new bridge was incrementally launched and its deck is a post tensioned concrete box girder 407m long. Some difficult ground conditions and the close proximity of the existing bridge posed problems for both design and construction. Prior to construction, predictions were made of the …more

Posted in 1998 Meetings, Meeting, South Australia and NT |

The Response of Reactive Clay Soils to Wetting in the Presence of Active Vegetation

The presentation outlined personal research in swelling soils, research undertaken to find sound modelling techniques to help answer questions on the long term effects of infiltration trenches around residential footings on clay soils, and the impact of adjacent vegetation on footing design.

Posted in 1998 Meetings, Meeting, South Australia and NT |

Collapsing Soils

Collapsing soil is defined in AS2870 as a weakly cemented soil subject to large settlements under load as a result of degradation by water on the cementing action. These soils are frequently encountered in South Australia and present challenges for geotechnical engineers and footing designers. Dr Mitchell described some experiences with collapsing soils, presented several …more

Posted in 1998 Meetings, Meeting, South Australia and NT |

Cobblers Creek Retention Dam Project

The Cobbler Creek retention dam in the City of Salisbury was constructed in 1997. Exposures seen during excavation for the dam and spillway foundations provided interesting insights into the geological formations in the foothills of the Mount Lofty Ranges. These formations, including the Quaternary sediments and folding and faulting of the underlying rocks, were discussed …more

Posted in 1998 Meetings, Meeting, South Australia and NT |

Southern Expressway Project

Stage 1 of the Southern Expressway project between Darlington and Reynella has been one of the most significant road projects in recent times both from environmental and geotechnical aspects. This seminar covered many of these aspects and included a detailed discussion of a number of slope stability “challenges” that were encountered.

Posted in 1998 Meetings, Meeting, South Australia and NT |