Cone Penetration Tests in Unsaturated Soils

This seminar will present results of UNSW’s ten year study on the cone penetration test in unsaturated soils. Firstly, laboratory-controlled cone penetration test results in two unsaturated soils will be presented, obtained using a suction-controlled calibration chamber. For unsaturated Sydney sand, the cone penetration resistances are found to increase significantly due to the presence of …more

Tree Roots and the Slope Stability of River Banks in Eastern Australia

Riverside vegetation is a significant factor influencing the occurrence and progress of streambed and riverbank erosion. Recent riparian management practice in Australia has focused on re-establishing or maintaining native riparian vegetation in order to control or prevent erosion as well as regenerate or preserve the complex variety of in-stream and riverside habitats. An integrated review …more

AGS Research Award

As part of their ongoing support of academic institutions and students, the Sydney and Newcastle Chapters of the Australian Geomechanics Society are offering the prestigious AGS NSW Research Award for research in Geotechnical Engineering or Engineering Geology. The award aims to provide a forum for research students from NSW universities to showcase their research to …more

Problematic Soils

The presentation will provide a brief summary of the activities of AGS over the last 2 years and then present a technical presentation on the topic “What is the Problem with Problematic Soils?” A large number of soils are considered to be problematic (eg. Collapsible soils, Expansive soils, Peat, Silty soils, Liquefiable soils). The talk …more

Rankine Lecture: Performance Based Design In Geotechnical Engineering

Engineering design consists of a sequence of decisions which should satisfy the client’s objective performance requirements. This lecture will argue that an assessment of geotechnical performance must involve ground displacements, and that the traditional approach of specifying safety factors is potentially wasteful. In particular, the Limit State Design (LSD) approach adopted in the Eurocodes will …more

AS2870 – 2011, Residential Slabs and Footings

What should the geotechnical profession know about the changes in the Code? The Code gives references to parties their functions and responsibilities to using the code. An example is the Classifier and Qualified Engineer. Reference is made to role of Engineering Geologists and Geotechnical Engineers. To understand the responsibilities of the qualified engineers using the …more

Quality Assurance of ground improvement using down-hole video techniques

Verification of ground improvement is a topic of on-going debate. The tried and tested methods are limited in certain conditions and the geotechnical fraternity is always exploring new avenues for verification. The use of down-hole cameras has become far more readily available as the technology advances and the camera size decreases. This presentation highlights the …more

The Mystery of Unsaturated Soils

Unsaturated soil mechanics continues to play poor relation to saturated soil mechanics, in part because of the dominance of conventional soil mechanics approaches involving saturated conditions, perhaps because the inclusion of another phase (air) adds considerable complexity, and because a soil at a given density is stronger, less compressible and less permeable (i.e. performs better) …more

Introduction to the engineering geology of Hobart

The Tasmanian Chapter of the Australian Geomechanics Society is hosting an introduction to the engineering geology of Hobart. The format will be a field trip to sites of engineering geological interest between Lower Sandy Bay and Taroona. We will view many of the main geological strata present around Hobart including Permian, Triassic, Jurassic, Tertiary and …more

Management of a Highway Pavement for Subsidence Impacts from Longwall Mining

The first of a number of planned longwalls directly beneath a freeway, southwest of Sydney has been completed. After a lengthy planning period, the risks to the highway pavement were successfully managed by the road authority, the mining company and a Technical Committee including specialists in the fields of pavement engineering, geotechnical engineering and subsidence. …more

Technical Field Trip: Western Port

That Sinking Feeling… Western Port: highs and lows in a tectonic embayment The Western Port embayment is generally a low-lying area bounded by the Mornington Peninsula to the west and the South Gippsland highlands to the north and east. The landforms that make up the embayment initiated in response to tectonic activity during the Tertiary, …more

Evening Technical Meeting: Western Port

That Sinking Feeling… Western Port: highs and lows in a tectonic embayment The Western Port embayment is generally a low-lying area bounded by the Mornington Peninsula to the west and the South Gippsland highlands to the north and east. The landforms that make up the embayment initiated in response to tectonic activity during the Tertiary, …more

Rock Slope Design in Layered Rocks: Some Precautionary Tales

The coal mining industry requires slope designs in layered coal measures and other rocks on a routine basis. The scale of these slopes far exceeds that of slopes in comparable materials for civil purposes, yet the effort involved in design of mine slopes is comparatively minor. There are many reasons for these apparent discrepancies but …more

Mine Void Treatment on Hunter Expressway Alliance – A Success Story

Nick The Hunter Expressway is a new government funded dual carriageway motorway built to relieve congestion between Newcastle and Thornton, Maitland and Rutherford. The expressway is continuous over 40 km between the F3 at Seahampton and Branxton. The easternmost 13 km between the F3 and Kurri Kurri is being built by the Hunter Expressway Alliance …more

Student Research Projects

PhD Project: Track Degradation at Bridge Transition Zones, Biyanvilage Dareeju (QUT) Bridge transition zones experience early track geometry deviation due to sudden stiffness variation, geotechnical causes, and soil moisture fluctuation. Differential settlement between bridge and its approach is a critical issue for the railway industry and no efficient solution is yet available to maintain a …more

Queensland One Day Symposium: “Geotechnical Challenges and Lessons Learned”

Join us on Thursday October 3 at the Treasury Casino, Brisbane for the AGS Queensland Chapter’s One Day Symposium “Geotechnical challenges and lessons learned”. Our speakers for the day include: John Phillips, GHD Patrick Wong, Coffey Martyn Robotham, Rio Tinto Jeremy Kruger, Thiess Peter Mitchell, Aurecon Chris Haberfield, Golder Associates Sponsors Platinum Sponsor Gold Sponsor …more

Groundwater in Mining

Groundwater assessments are an integral part of almost every mining project. When a void (mine) is developed below the water table, groundwater will ingress to fill the mine void. A hydrogeological assessment is undertaken in order to ascertain the quantum of likely inflows and to evaluate the most appropriate dewatering / groundwater control measures to …more