Laboratory investigation on the effects of overburden pressure, water, and time on slaking induced material property degradation of coal mine spoil
Gallage, Chaminda, Mostofa, Golam, Vosolo, David, & Rajapakse, Jayasiri (2015) Laboratory investigation on the effects of overburden pressure, water, and time on slaking induced material property degradation of coal mine spoil. In Hossain, Zakaria, Kobayashi, Akira, & Inazumi, Shinya (Eds.) Geotechnique, Construction Materials and Environment, The Geomate International Society, Osaka, Japan, pp. 395-400.
In open-cut strip mining, waste material is placed in-pit to minimise operational mine costs. Slope failures in these spoil piles pose a significant safety risk to personnel, along with a financial risk from loss of equipment and scheduling delays. It has been observed that most spoil pile failures occur when the pit has been previously filled with water and then subsequently dewatered. The failures are often initiated at the base of spoil piles where the material can undergo significant slaking (disintegration) over time due to overburden pressure and water saturation. It is important to understand how the mechanical properties of base spoil material are affected by slaking when designing safe spoil pile slope angles, heights, and dewatering rates. In this study, fresh spoil material collected from a coal mine in Brown Basin Coalfield of Queensland, Australia was subjected to high overburden pressure (0 – 900 kPa) under saturated condition and maintained over a period of time (0 – 6 months) allowing the material to slake. To create the above conditions, laboratory designed pressure chambers were used. Once a spoil sample was slaked under certain overburden pressure over a period of time, it was tested for classification, permeability, and strength properties. Results of this testing program suggested that the slaking of saturated coal mine spoil increase with overburden pressure and the time duration over which the overburden pressure was maintained. Further, it was observed that shear strength and permeability of spoil decreased with increase in spoil slaking.
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|Item Type:||Conference Paper|
|Keywords:||Coal mine spoil, Slaking, Overburden Pressure, Shear Strength, Permeability|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Civil Geotechnical Engineering (090501)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Water Quality Engineering (090508)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700) > Environmental Technologies (090703)
|Divisions:||Current > Schools > School of Civil Engineering & Built Environment
Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2015 The Geomate International Society|
|Deposited On:||23 Nov 2015 05:49|
|Last Modified:||28 Nov 2015 13:04|
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