Characterization of a gold tailings with hypersaline pore fluid

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Abstract

A series of samples obtained from adjacent to piezocone penetration test (CPTu) locations within a gold tailings storage facility were tested to compare the inferred state parameter Ψ from CPTu results to the in situ density and critical state line (CSL) from reconstituted samples, and to assess the effects of salt concentration in the sample pore fluid on mechanical behaviour of the material. Preparation of samples with similar salt concentrations to those measured in situ gave CSLs that compared favourably to estimates of Ψ from the CPTu, in light of measured in situ density. Tests prepared without salt did not tend towards the same CSL as the salt samples, generally being at higher densities both following consolidation and subsequent shearing. These results are consistent with the observed effects of salt on mechanical behaviour in previous testing on clays. The implications and limitations of the testing program are outlined, and the need for further investigation of these issues is emphasised owing to the importance of tailings storage facility perimeter embankment stability.
Keywords: CPTu, critical state, salinity, triaxial
Original languageEnglish
Number of pages51
JournalCanadian Geotechnical Journal
Issue numberja
DOIs
Publication statusPublished - 16 May 2019

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Tailings
tailings
gold
Gold
critical state
Salts
salt
Fluids
fluid
penetration test
Embankments
Testing
Shearing
embankment
Consolidation
consolidation
Clay
salinity
clay
in situ

Cite this

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title = "Characterization of a gold tailings with hypersaline pore fluid",
abstract = "A series of samples obtained from adjacent to piezocone penetration test (CPTu) locations within a gold tailings storage facility were tested to compare the inferred state parameter Ψ from CPTu results to the in situ density and critical state line (CSL) from reconstituted samples, and to assess the effects of salt concentration in the sample pore fluid on mechanical behaviour of the material. Preparation of samples with similar salt concentrations to those measured in situ gave CSLs that compared favourably to estimates of Ψ from the CPTu, in light of measured in situ density. Tests prepared without salt did not tend towards the same CSL as the salt samples, generally being at higher densities both following consolidation and subsequent shearing. These results are consistent with the observed effects of salt on mechanical behaviour in previous testing on clays. The implications and limitations of the testing program are outlined, and the need for further investigation of these issues is emphasised owing to the importance of tailings storage facility perimeter embankment stability. Keywords: CPTu, critical state, salinity, triaxial",
author = "David Reid and Andy Fourie and Stephen Moggach",
year = "2019",
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doi = "10.1139/cgj-2018-0579",
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T1 - Characterization of a gold tailings with hypersaline pore fluid

AU - Reid, David

AU - Fourie, Andy

AU - Moggach, Stephen

PY - 2019/5/16

Y1 - 2019/5/16

N2 - A series of samples obtained from adjacent to piezocone penetration test (CPTu) locations within a gold tailings storage facility were tested to compare the inferred state parameter Ψ from CPTu results to the in situ density and critical state line (CSL) from reconstituted samples, and to assess the effects of salt concentration in the sample pore fluid on mechanical behaviour of the material. Preparation of samples with similar salt concentrations to those measured in situ gave CSLs that compared favourably to estimates of Ψ from the CPTu, in light of measured in situ density. Tests prepared without salt did not tend towards the same CSL as the salt samples, generally being at higher densities both following consolidation and subsequent shearing. These results are consistent with the observed effects of salt on mechanical behaviour in previous testing on clays. The implications and limitations of the testing program are outlined, and the need for further investigation of these issues is emphasised owing to the importance of tailings storage facility perimeter embankment stability. Keywords: CPTu, critical state, salinity, triaxial

AB - A series of samples obtained from adjacent to piezocone penetration test (CPTu) locations within a gold tailings storage facility were tested to compare the inferred state parameter Ψ from CPTu results to the in situ density and critical state line (CSL) from reconstituted samples, and to assess the effects of salt concentration in the sample pore fluid on mechanical behaviour of the material. Preparation of samples with similar salt concentrations to those measured in situ gave CSLs that compared favourably to estimates of Ψ from the CPTu, in light of measured in situ density. Tests prepared without salt did not tend towards the same CSL as the salt samples, generally being at higher densities both following consolidation and subsequent shearing. These results are consistent with the observed effects of salt on mechanical behaviour in previous testing on clays. The implications and limitations of the testing program are outlined, and the need for further investigation of these issues is emphasised owing to the importance of tailings storage facility perimeter embankment stability. Keywords: CPTu, critical state, salinity, triaxial

U2 - 10.1139/cgj-2018-0579

DO - 10.1139/cgj-2018-0579

M3 - Article

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JF - Canadian Geotechnical Journal

SN - 0008-3674

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ER -