Gareth presented a consolidation model that allows for the effects of desiccation which is prevalent in slurried mineral waste deposits in areas of high evaporation. The coupled model is based on conventional large strain consolidation of saturated porous media extended to include the effects of partial saturation using the Richards equation. The model can accommodate …more
Antonio outlined a case study involving three dimensional finite element analysis of a 150m high arch dam founded on fractured Cretaceous limestone. Key constraints were limited abutment resistance and unfavourable defect orientation. Details of data acquisition including in situ rock mass shear testing were presented. The finite element analysis modelled discontinuities using individual joint elements …more
Constitutive modelling of soil remains a topic of considerable debate in Geotechnical Engineering. The speaker addressed some of the important issues in developing useful constitutive models.
Mining of iron ore at Kiruna by sub-level caving is now at a depth of 500m below the surface, and stress related problems are being encountered. The purpose of the present investigation is to estimate the the stresses around the drawpoints from which fragmented ore is recovered. The rock may reasonably be taken to be …more
An alternative to the Finite Element Method, the Discrete Element Method is particularly suitable for modelling granular materials and for studying the relationship between `micro’ and `macro’ behaviour. Discrete Elements allow contacts between elements to be created or broken and can therefore be used to gain insight into the processes of nucleation and growth of …more
An 11m high embankment was thoroughly instrumented with piezometers, settlement rods and inclinometers to measure the behaviour of the underlying 40m thick deposit of Boston Blue Clay during staged loading and four years of subsequent consolidation. estimates of the engineering properties of the clay were made based on in-situ testing and laboratory test programs. Finite …more
Second joint AGS and Mine Subsidence Technology Society Conference to be held in Newcastle on July 12-14 1998. The conference included the presentation of 18 papers by invited authors as well as 10 other contributed papers.
In routine geotechnical design of foundations, slopes and retaining walls a factor of safety is applied to ultimate collapse loads. But very different factors of safety are used for different structures. Also soil has several different strengths; peak, constant volume (or critical state) and residual. Moreover, it is not always clear what constitutes failure of …more
Professor Drozd is a long serving member on this Eurocode committee. Professor Karel Drozd presented the approach of Eurocode 7 to different methods of field testing and analysis of the results. Special reference was made to the limit states nature of this code. The presentation was illustrated by examples from his personal experiences through using …more
It is experimentally evident that large monotonic shearing of a granular material causes a concentra-tion of the shear deformation into narrow zones along walls or inside of the granular body. Location, orientation and the evolution of strain localisation is determined by the mechanical properties of the granular material and the boundary conditions of the described …more
Background: In 1990 the Hong Kong Government launched the Airport Core Programme to provide a new international airport together with nine associated projects at a total cost of over twenty billion US dollars, making it one of the world’s largest infrastructure developments. The completion of the New Hong Kong International Airport in only seven years …more
The design of any geotechnical structure of significance requires the quantification of safety and in some cases movements. To achieve this the designer must perform calculations using some form of analysis. At present there are several forms of analysis available, all of which involve simplifications and approximations. This lecture will begin by briefly comparing these …more
This project was recently acknowledged by the Association of Consulting Engineers Australia (ACEA) in their Engineering Excellence Awards for 1999. For the past 20 years Douglas Partners have been advisors the water authority (initially HWC, and subsequently DLWC) in monitoring the effects of mineral sands mining on the Tomago Sandbeds aquifer. The Sandbeds are also …more