Geotechnical engineering (foundations, slope stability, earthquake engineering, embankments on soft foundations, expansive clay foundations).

• Geomechanics of mine waste disposal and rehabilitation (field monitoring, laboratory modelling and testing, and analysis)
• Application of unsaturated soil mechanics to the water balance of mine waste rock dumps and tailings storage facilities, during operation and post-closure
• Mined landform design
• Dewatering of mineral products. Disposal of nickel laterite residue
• Risk assessment and cost-effectiveness analysis applied to mine site rehabilitation

Professor Williams is widely sought for his expert advice, opinion and peer review, in particular to mine waste disposal and mine site rehabilitation and remediation at operating mines throughout Australia and overseas. In Australia, he has consulted to numerous mines, particularly in Queensland, Western Australia, New South Wales, Tasmania and South Australia, covering coal, gold, nickel sulphide, bauxite and laterite nickel. Overseas he has worked with mines in North and South America, the South Pacific and Asia.

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