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Evaluation of Liquefied Strength of Uncompacted Tailings Sand Using Cone Penetration Test at an Oil Sands Tailings Facility Zhang, Ying; Abusaid, Ayman H.; Pollock, Gordon W.; Qiu, Yvonne (Yirao); Moore, Ryan; Rhee, Jason
Abstract
Tailings sand placed hydraulically and uncompacted in a beach above water (BAW) setting can be potentially liquefiable when the structure is raised at a high rate. Experience has shown that flow liquefaction often takes place with small trigger events and no warning and can have serious safety, environmental, and infrastructure consequences. Although dozer compaction is commonly used to construct a non-liquefiable shell, flow liquefaction of the uncompacted tailings sand upstream of the shell remains a key design element. An upstream tailings sand structure (Sand Dump) at Suncor has been constructed with 5 m lifts at a rate between 10 m and 20 m per year since 2012. The final height of the sand structure is approximately 130 m and it is expected to be completed by 2024. The Cone Penetration Test (CPT) is commonly used as a field investigation tool to evaluate the potential of flow liquefaction and has been used extensively at the Sand Dump for this purpose for the compacted and uncompacted BAW zones. This paper focuses on the liquefaction assessment for the uncompacted tailings sand. CPTs have been carried out across the project site at the same locations in successive years to evaluate the impact of subsequent sand loading on the liquefaction potential of the uncompacted tailings sand. This paper provides the estimated liquefied strength of the uncompacted tailings sand and its correlation with the distance from the discharge location. The findings are used to verify the initial design assumptions and could provide valuable information for the design of similar future structures.
Item Metadata
Title |
Evaluation of Liquefied Strength of Uncompacted Tailings Sand Using Cone Penetration Test at an Oil Sands Tailings Facility
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Creator | |
Contributor | |
Date Issued |
2023-11
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Description |
Tailings sand placed hydraulically and uncompacted in a beach above water (BAW) setting can be potentially liquefiable when the structure is raised at a high rate. Experience has shown that flow liquefaction often takes place with small trigger events and no warning and can have serious safety, environmental, and infrastructure consequences. Although dozer compaction is commonly used to construct a non-liquefiable shell, flow liquefaction of the uncompacted tailings sand upstream of the shell remains a key design element. An upstream tailings sand structure (Sand Dump) at Suncor has been constructed with 5 m lifts at a rate between 10 m and 20 m per year since 2012. The final height of the sand structure is approximately 130 m and it is expected to be completed by 2024. The Cone Penetration Test (CPT) is commonly used as a field investigation tool to evaluate the potential of flow liquefaction and has been used extensively at the Sand Dump for this purpose for the compacted and uncompacted BAW zones. This paper focuses on the liquefaction assessment for the uncompacted tailings sand. CPTs have been carried out across the project site at the same locations in successive years to evaluate the impact of subsequent sand loading on the liquefaction potential of the uncompacted tailings sand. This paper provides the estimated liquefied strength of the uncompacted tailings sand and its correlation with the distance from the discharge location. The findings are used to verify the initial design assumptions and could provide valuable information for the design of similar future structures.
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Genre | |
Type | |
Language |
eng
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Date Available |
2023-12-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercialNoDerivatives 4.0 International
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DOI |
10.14288/1.0438159
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Other
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Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercialNoDerivatives 4.0 International