David John Williams

David John Williams
The University of Queensland | UQ · School of Civil Engineering

BE Civil Engineering (Hons I), Monash, 1976; PhD, Soil Mechanics, Cambridge, 1979

About

304
Publications
93,579
Reads
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4,383
Citations
Citations since 2017
79 Research Items
2863 Citations
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20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
Additional affiliations
July 1983 - November 2015
The University of Queensland
Position
  • Director of Geotechnical Engineering Centre

Publications

Publications (304)
Conference Paper
Full-text available
The increasing depth of tunnels and underground mining operations worldwide has resulted in the rise of deep mines at temperatures well above 50°C. Such unwanted thermal gradients not only adversely impact the physical and mechanical behaviours of the rock mass but could also affect the safety of underground mines leading to temporarily and permane...
Conference Paper
The contribution of the mining industry to the global economy has reached (and gone beyond) $1,800 billion in recent years that necessitates (more than before) the need to ensure workability, viability, health, and safety of mine sites and workers to meet the ever-increasing global demand for mineral resources. Amongst the many challenges facing th...
Article
Installation of granular columns is a cost-effective and versatile in situ technique to improve the shear strength, settlement, and drainage behavior of weak soils. It involves backfilling vertical boreholes in the ground with granular materials stiffer than the native soil, such as stone or compacted sand. However, the massive use and overexploita...
Article
Full-text available
A high rate of rise of fine-grained mine tailings slurry on disposal in a tailings storage facility (TSF) may maintain them under-consolidated. The proper simulation of such field deposition of tailings in conventional laboratory consolidation testing is challenging. A slurry consolidation test using a high constant rate of loading (CRL) simulates...
Conference Paper
Full-text available
In response to high demands for minerals and in the light of rapid advancement in instrumentation and testing facilities, mines, tunnels, and infrastructures are getting deeper at an annual increasing rate. For instance, Australia's deepest Gwalia gold mine near Leonora is extending beyond 2 km depth in the hunt for more ore. In Europe, the Gotthar...
Conference Paper
Full-text available
Amongst many mechanical properties, cohesion (𝑐) and angle of internal friction (𝜑) are probably the most widely used rock and rock-like material strength design parameters. However, unlike Mohr-Coulomb (MC) failure criterion that assumes cohesion and friction angle are intrinsic material properties and are not affected by the applied stress level,...
Article
Full-text available
Different regions worldwide have adopted various approaches to tailings management, as a result of the site settings and local practices as they have evolved. Tailings dam failures have continued to occur in both developing and developed countries, necessitating a range of tailings management approaches. These failures, while rare, continue to occu...
Article
Full-text available
Proper understanding and analysis of the consolidation behaviour and parameters of tailings from a slurry-like to a soil-like state are vital for the design, management, and assessment of a tailings storage facility (TSF). Fine-grained coal tailings slurry can undergo relatively rapid and substantial settlement from a slurried state and can experie...
Conference Paper
Full-text available
The rapid expansion of urban and mining infrastructure over the last two decades has seen an escalation of development in hard rocks, including urban tunnels, large open pits, and deep underground mines. However, despite many success stories, explosion-like fractures at depth (commonly known as spalling and rock bursts) still happens. This highly c...
Article
Full-text available
New literature, mining regulators, insurance firms, and mining practitioners are calling for increased diligence in the form of real-time monitoring: but what can the industry offer in response? This research establishes a centralisation of instrumentation systems suitable for tailings dams, discussing the specifications, advantages, and disadvanta...
Article
Full-text available
The intent of this paper is to provide overview context to allow broader understanding of conventional tailings dam failure mechanisms. The research leverages global knowledge, experience, and data collection and interpretation for the safe and controlled management of the geotechnical stability of a tailings storage facility. The motivation for th...
Article
Full-text available
The conventional disposal of slurried tailings in a tailings storage facility (TSF) leads to the formation of a beach, on which the tailings sort hydraulically, settle, consolidate, and desiccate upon exposure. Basic geotechnical testing, such as specific gravity, Atterberg limits, and particle size distribution, found that there was no particular...
Article
Rock fracturing or breakage is a complex phenomenon that requires advanced and sophisticated techniques to predict fracture initiation and propagation in geological structures under in-situ or induced stresses. In previous studies less attention have been paid to quantify damage in the Fracture Process Zone (FPZ) under various loading conditions. T...
Article
Full-text available
With ongoing catastrophic mine tailings dam failures, the hindsight revelation of poor safety records, and an increasing prevalence of public scrutiny and attention of mining operations, there is an immediate call for enhanced safety of tailings dams. Today, challenges arise in identifying and utilising the ability of monitoring systems to understa...
Conference Paper
Full-text available
Tailings are commonly deposited as a thickened slurry of low shear strength, which relies on consolidation and desiccation for densification and strength gain. However, in practice tailings sufficient consolidation and desiccation may not occur as the tailings layers are deposited, and the tailings may remain saturated and under-consolidated. Fibre...
Conference Paper
Full-text available
This paper explores the influence of common external factors in the tailings dam environment on phreatic conditions. The phreatic condition in tailings dams and deposited tailings responds differently as a result of material permeability and changes in external conditions. It is important for operators and designers to understand the influence of e...
Conference Paper
Full-text available
Due to the huge demands for natural resources and minerals at a global scale, mining depths have progressively increased over the past decades to 1,000 m and deeper. However, despite many successes, deep mining operations are now facing new challenges never experienced before, including rock spalling and unwanted slabbing failures. This phenomenon...
Article
Full-text available
The aim of this paper is to study the addition of fly ash in red mud slurry in the view of environ-mental sustainability, as a contribution to waste disposal methods. Three mixtures with red mud concentrations ranging from 400 g/L to 800 g/L and fly ash addition (maximum of 30% per mass of solid in the slurry) were studied. Textural and morphologic...
Article
The increasing price and diminishing reserves of construction sand encourage a need to develop its sustainable and cost-effective replacement, helping the transition towards a circular economy. Waste glass is a derivative of natural sand and could potentially show similar geotechnical behaviour. Using crushed waste glass (CWG) as an alternative to...
Conference Paper
Advances in instrumentation, methods for data collection and techniques in manufacturing precision testing machines have paved the way for very promising recent researches related to the failure characteristics of construction materials under true field loading conditions. Nevertheless, the majority of available biaxial and true triaxial failure en...
Article
Full-text available
The volume change and shear strength behaviour of tailings slurry with the changes in gravimetric moisture content is important to effectively utilise the storage volume and analysis of dam failure potential. Consolidation testing of tailings from a slurry-like to soil-like state is a critical task, and conventional consolidation apparatus does not...
Article
Full-text available
Real-time monitoring can improve the performance assessment of tailings dams by reducing the laborious component of data collection while streamlining the analysis process. When planning and installing instrumentation, the challenge exists where if nothing goes wrong, the question is asked whether too much instrumentation is installed, where on the...
Conference Paper
This study presents the results of a series of investigations on the effects of testing parameters (including the rate of loading, machine stiffness, and contact conditions) on material’s Young’s modulus and Poisson’s ratio. A 100 mm Aluminium cube (grade 7075-T6) was selected as the reference sample and tested both with a 10 MN MTS compression mac...
Article
Each year, hundreds of thousands of tonnes of industrial wastes are being stockpiled, landfilled and disposed of in storages occupying large areas of land that would otherwise be available for productive use. Recycling of such wastes is now becoming of urgent global interest due to increasing population, the rise in anthropogenic activities, and th...
Conference Paper
The deposition of fine-grained tailings as a somewhat thickened slurry remains the norm, and presents challenges in the assessment of their geotechnical parameters and the analysis of their settling and consolidation behaviour. The conventional oedometer and Rowe cell consolidometer are not suitable for testing tailings from a slurry state. In this...
Article
Many countries have large unsealed road networks which are essential for business efficiency, social connectedness, and community safety. These roads are maintained at considerable cost mainly through blading and re-gravelling. The latter is a major component of the maintenance and is determined by gravel loss. Gravel loss prediction models can be...
Article
Full-text available
Thermal response testing (TRT) and thermal recovery testing were conducted on a full-scale precast energy pile installed in saturated multi-layer soils to investigate the thermal response on the pile and soils. The thermal and physical properties of the soil were assessed through laboratory testing and compared to the estimated properties from the...
Article
Full-text available
Due to the differences in mineral processing techniques, the grain-size of tailings used in the construction of a tailings pond is not commensurate. It has been determined that the hydrodynamic characteristics of mudflow resulting from the failure of tailings dams are directly influenced by grain-size, solids concentration, and the surface roughnes...
Article
Full-text available
The intent of this paper is to establish the foundation for improvement of monitoring strategies for the safe and controlled management of the geotechnical stability of a tailings storage facility. This paper establishes what currently defines best practice in an effort to realign global practices and in turn encourage greater collaboration in safe...
Article
Full-text available
The soil water retention curve (SWRC) is the relationship between the volumetric water content and the matric suction of an unsaturated soil. One key parameter of the SWRC is the air-entry value (AEV), which defines the minimum matric suction at which air starts to enter the largest pores in the soil as it desaturates. The volumetric water content...
Article
Full-text available
The behaviour of footings on geosynthetic-reinforced soils has been investigated by many researchers through experimental and numerical modelling under stress-controlled or strain-controlled conditions. A new experimental set-up was designed under a stress-controlled condition, with the application of the particle image velocimetry (PIV) technique....
Article
Full-text available
Overtopping failure of reinforced tailings dam may cause significant damage to theenvironment and even loss of life. In order to investigate the feature of overtopping of the reinforcedtailings dam, which has rarely appeared in the literature, the displacement, the phreatic level and theinternal stress of dam during overtopping were measured by a s...
Chapter
Full-text available
Shallow geothermal systems allow both heating and cooling of structures by using the ground as a renewable energy source. These systems have received significant attention in recent decades and careful design consideration is necessary to ensure maximum efficiency. In this paper, the authors examine the impact of spacing between ground heat exchang...
Article
The application of geosynthetics in the road pavement industry as a reinforcement has increased dramatically in recent years. Geosynthetic inclusions can significantly: (i) increase the bearing capacity of the pavement, (ii) prolong the road service life, (iii) reduce maintenance costs, iv) diminish unfavourable large vertical and lateral pavement...
Article
Crusher run is a type of construction aggregate produced in a quarry by breaking down the rock to various sizes using a mechanical crusher. Scalping is an essential process for a quarry to produce a series of crusher run products with specific grading specifications for various applications. To study the effects of scalping on the direct shear stre...
Article
The present study aims to review the efficacy of three widely used roughness prediction models (Highway Development Model/HDM-4, Australian and South African) in the determination of blading frequencies to control roughness in the management of unsealed roads. The review comprises an assessment of the information used in the formulation of the mode...
Conference Paper
Full-text available
Fine-grained coal tailings slurry undergoes only limited settling and self-weight consolidation, and tends to remain slurry-like and unsuitable for conventional laboratory consolidation testing. In addition, constant rate of loading consolidation testing is more representative of the continuous disposal of tailings slurry into a tailings storage fa...
Conference Paper
Full-text available
Worldwide production of black coal amounts to about 8 billion tonnes. Perhaps 20% of this annual production is washed to improve its quality, generating perhaps 250 million tonnes of coal tailings annually, generally in the form of a slurry. The coal tailings slurry is typically thickened to about 25% solids by mass prior to disposal to a tailings...
Conference Paper
The flooding of open strip coal mines in the Bowen Basin and Hunter Valley Coalfields of Eastern Australia has the potential to soften the spoil and floor materials to produce “mud”. This mud can act as a slip plane or weak zone when spoil is dumped into it, resulting in geotechnical instabilities. Once mud has formed, typical handling techniques i...
Conference Paper
Full-text available
Tailings dam failures continue to occur worldwide at an unacceptable rate, averaging two events annually over the last 100 years. Furthermore, tailings dams continue to grow in size, increasing the potential release of tailings and water should they fail. Tailings are generally deposited in a slurry state, with the potential to flow if containment...
Article
Shear strength parameters of compacted clay liners (CCLs) are needed for the safety design and stability analyses of mine waste dumps. The shear strengths of soils are commonly determined through laboratory direct shear or triaxial tests. However, for the same soil sample, different testing methods may produce large sets of scattered shear strength...
Article
It is essential to measure the shear strength of soils and interface parameters between soils and geosynthetics for the safe design and stability analysis of geosynthetic-reinforced soil structures. These parameters recommended for engineering projects are normally measured by laboratory single-stage direct/interface shear and pull-out tests. The c...
Article
Anchored geosynthetics are able to withstand higher tension and provide higher anchorage capacity. The simple run-out and wrap-around anchorages are two commonly used configurations in anchored geosynthetics. However, the influence of geometric parameters of different anchorage configurations on pull-out performance is still problematic. To study t...
Conference Paper
Full-text available
formations, (ii) the failure itself, and (iii) large-scale post-failure displacements or deformation. Slope stability analysis in geotechnical engineering practice is currently focused on establishing the pre-failure state and determining the physical conditions that may trigger the landslide. Typical analyses use limit equilibrium methods, plastic...
Article
Full-text available
A simulation framework based on Smoothed Particle Hydrodynamics (SPH) is introduced to model problems involving the interaction between flowing water and soil deformation. Changes in soil porosity and associated permeability are automatically adjusted within this framework. The framework’s capabilities are presented and discussed for three geotechn...
Article
Installing sand columns in clays is a common ground improvement technique used to treat soft soils, and the inclusion of geotextile to encase the sand column can further improve the performance of the reinforced clay composite. In this work, the shear strength and consolidation characteristics of clay, clay with an ordinary sand column (OSC) and cl...
Article
Extreme weather events, such as floods, are becoming more frequent in future with all consequences concerning the safety especially of water retaining structures, in particular, levees used as technical flood protection. The knowledge and correct consideration of coupled hydro-mechanical processes influencing the failure and post-failure behaviour...
Article
Previous studies reveal that a loss in Modulus of Resilience (Mr) has an adverse effect on pavement performances. However, no study investigated this during extreme moisture intrusion at granular and subgrade layers, which may be compared with a flooding situation. This study has aimed to assess the impact of change in Mr due to moisture increase o...
Article
As a major type of soil internal erosion, suffusion is causative for many geotechnical problems of earth structures and foundations. Although full laboratory tests are laborious, it is inevitable for susceptible soils. However, a good quick assessment can define those susceptible soils by eliminating quickly very stable and unstable soils from cons...
Conference Paper
Full-text available
Globally, there are on average at least two tailings dam failures annually, resulting in loss of life, damage to infrastructure and environmental impact downstream. Despite the importance of being able to postulate tailings dam-break and run-out, available guidelines specific to tailings dams are outdated and unreliable. The more established guidel...
Article
Three tests of slurried Jeeropilly coal tailings in a purpose-built slurry consolidometer under three different loading sequences were numerically analysed to study the friction losses quantitatively. A simplified sedimentation-consolidation theory was proposed to link the initial suspended state and soil-like state of slurries. The numerical simul...
Article
Full-text available
Reliability-based design (RBD) has been proved effective in the application of probability theory to research and practice in geotechnical engineering. However, the limited field and laboratory information makes it difficult to build robust predictions. This note shows some statistical relationships that may help with additional information in this...
Conference Paper
Expansive soils are subject to significant volume change due to changing soil moisture conditions, largely in response to changing climatic conditions. These expansive soils swell and shrink as the soil moisture content increases and decreases, respectively. This climate-induced ground deformation causes significant damage to structures founded on...
Article
Although several studies observed pavement responses after flooding, no detailed quantification has been done to date. This paper has estimated different pavements’ performances with flooding to identify flood-resilient roads. This was shown through (1) new roughness and rutting-based road deterioration (RD) models, (2) the relationship between cha...
Article
Full-text available
This paper presents the results of a comprehensive study on the morphology of weathering profiles developed on metamorphic and sedimentary rocks under subtropical climate, focusing on its influence on geotechnical parameters of weathering materials. Several cut and natural slopes were selected for more detailed descriptions of their physical, miner...
Article
Each road authority requires set maintenance standards and strategies to manage its roads. This paper has achieved that for the Queensland road authority as an example. The 34,000 km road network has been divided in to 27 road groups using pavement type, loading and pavement strength as criteria to set standards and strategies for each of them, whi...
Article
Full-text available
The thermal cone dissipation test is a newly-developed method for determining thermal conductivity in situ based on temperature dissipation over time. The standard cone penetration test with pore pressure measurement (CPTu) is used. The cone heats up as it is pushed through the soil, due to the build-up of friction on the cone and rods. The dissipa...
Poster
Full-text available
Phytochemistry, Nutritional values, Composition, Bioaccessibility, Absorption, Toxicity
Conference Paper
Full-text available
The designers of surface tailings dams are routinely required to carry out dam-break and run-out analyses, which have become more important with the ongoing failure of tailings dams worldwide. The analysis methods conventionally used are based on the more simple analysis of water dam-break and run-out. However, tailings dams add the complexities th...
Article
Full-text available
Simulations of two-dimensional (2D) flow past a circular cylinder in the Smoothed Particle Hydrodynamics (SPH) are presented in this paper. This study focused on the accurate determination of the drag coefficient using SPH-based simulation. The fluid was modeled as a viscous liquid with weak compressibility. Boundary conditions, such as a no-slip s...
Conference Paper
A novel approach is presented to consider the porosity and permeability as a variable parameter during failure within moderate to high permeable soils, and Smoothed Particle Hydrodynamics (SPH) method is used as the solver. Several comparisons between numerical simulations and conducted experimental results were discussed for three studied problems...
Conference Paper
Full-text available
Ground coupled heat pumps are recognized as a means of increasing energy efficiency and reducing emissions through geothermal energy. The purpose of this study was to demonstrate the influence site selection has on the feasibility and financial viability of geothermal projects. The impact thermal conductivity and volumetric heat capacity has on pro...
Conference Paper
The applicability of a new test method involving semi-circular (truncated) Brazilian disc specimens is examined in this study to effectively eliminate the unwanted high shear stresses at the loading points, as well as the multiple cracking that commonly occurs in the testing of standard Brazilian dicks comprising hard and brittle materials. A serie...
Conference Paper
The Brazilian test is one of the most established techniques used for indirect measurement of rock tensile strength. When the test is applied to soft to medium strength rocks, the rupture mechanism is always through the formation of a single diametrical crack initiated at the centre of the disc, where the induced tensile stress is the maximum. Howe...
Article
In this investigation, coal tailings have been subjected to the three consecutive processes of settling, consolidation and desiccation in a large purpose-built slurry consolidometer. The results of the tests were then compared with a self-weight-consolidated specimen desiccated in a column. The result indicates that the consolidation with a constan...
Conference Paper
Full-text available
Red mud is a toxic by-product from the hot, caustic refining of bauxite to produce alumina, and is produced in the form of an aqueous slurry. It is typically thickened, and transported to a surface storage facility. The volume of red mud generated worldwide is increasing dramatically, leading to a massive amount of red mud to be stored annually. In...
Conference Paper
This study reports the results of a study on recycling regional waste materials in fired clay bricks. Different batches of waste materials, including fly ash collected at two Queensland power stations and red mud collected at Queensland Alumina Limited (QAL) alumina refinery, were prepared in a wide range of mixes, as potential additives in local b...
Conference Paper
Full-text available
Drilled displacement piles (DDP) have been used around the world for decades as foundation elements for structures and embankments. Typically the pile toes are designed to penetrate into stiff or dense soil formations to achieve sufficient base resistance. Recent research at The University of Queensland in Brisbane, Australia has discovered that th...
Article
Highway pavements generally perform poorly after flood events. However, no study has addressed this in detail, so the aim of the current research was to evaluate pavement performance before and after a flood. Roughness against time data for the last 10–12 years for 34 000 km of roads in Queensland, Australia, were used to obtain an abrupt jump in r...
Article
Co-disposal of fine-grained wastes or tailings and coarse-grained wastes or coarse reject generated on the processing of the run-of-mine coal, offers potential economic, geotechnical and environmental advantages over conventional separate disposal practices. To evaluate the compressibility behaviour and performance of coarse reject, tailings and mi...