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1 2007

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Piezocone in silty tailing materials.

Schnaid F., Bedin J., Costa Filho L.M.

Studia Geotechnica et Mechanica

2007

Vol. 29, nr 1-2

151-162

Countries with large mining industry operations face serious environmental risks resulting from large-scale mining activities. Although there has been a significant improvement in the design and management of tailings storage facilities, there are still major economic and technical constraints that cause important environmental impact in discharge areas. From a technical perspective, investigations of water table configuration, aquifer boundaries, site characterization and determination of short- and long-term properties of tailings materials are important requirements for engineering of tailings. These aspects are evaluated in this paper from the results of piezocone tests, with focus on aspects regarding segregation, shear strength and consolidation properties of gold and alumina mining tailings. Attention is given to identification of essential features that link the rate of cone penetration to drainage effects, which is achieved by expressing the results in a space that correlates a di-mensionless velocity V with the degree of drainage U. In this space, partial drainage is identified and the risk of overestimating properties assessed from field tests is avoided.