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Mechanical and hydraulic properties of residual dolomite and wad

D. Swart, Matthys A. Dippenaar and J. Louis Van Rooy
Mechanical and hydraulic properties of residual dolomite and wad
South African Journal of Geology (August 2019) Pre-Issue Publication


The properties of residual dolomite, sometimes termed wad, are variable and uncertain. It represents the insoluble residue after dissolution of dolomite and is commonly found in the Neoarchaean Malmani Subgroup of the Chuniespoort Group (South Africa). This study comprised triaxial tests, crumb tests, X-Ray diffraction and fluorescence spectroscopy, foundation indicators, stereo-microscope imagery and permeability testing of the represented formations outcropping in the northeastern portions of South Africa. Results concur that residual dolomite is not typically dispersive, has low density that can be below that of water, mostly grades in the silt fraction, has high plasticity indices with low to high liquid limits, and has hydraulic conductivities in the order of 1X10 (super -6) m/s. This new knowledge database contributes to our understanding of the flow through these systems and to how ingress scenario subsidences and sinkholes can possibly occur.

ISSN: 1012-0750
EISSN: 1996-8590
Serial Title: South African Journal of Geology
Serial Volume: Pre-Issue Publication
Title: Mechanical and hydraulic properties of residual dolomite and wad
Affiliation: University of Pretoria, Department of Geology, Pretoria, South Africa
Published: 20190801
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 24
Accession Number: 2019-082876
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
S26°45'00" - S24°45'00", E27°19'60" - E29°15'00"
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Geological Society of South Africa. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201944
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