Archived
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Location
Lexington, Kentucky
Start Date
7-5-2026 10:30 AM
End Date
7-5-2026 11:00 AM
Description
A new geotechnical stability analysis method has been implemented for a CCR surface impoundment to aid in design for temporary cut slopes and final closure grades. Conditions have come to light after significant tailings dam failures occurred across the globe, specifically those exhibiting flow failures (i.e. failures in which tailings behave a liquid and flow out of the facility). These failures have come under intense scrutiny as the failures pose significant risk to public safety and the environment and have been observed in CCR. Additionally, static liquefaction has arisen as another potential but less well understood causative mechanism. As the mining industry pivots to account for these considerations in design of tailings management facilities, a procedure was developed by Timothy Stark, Jiale Lin, and Hyunil Jung and published in 2023 to assess susceptibility of mine tailings to static liquefaction, seismic liquefaction, and reduced “yield” strengths due to excess pore pressure development, as well as assess slope stability against static liquefaction and flow failures. Can these lessons and procedures be expanded to the CCR industry and aid practitioners and owners in mitigating the risks associated with static liquefaction and flow failures of CCR? This presentation will provide an overview of the procedure and explore the applicability of this procedure to CCR and the susceptibility of CCR to static liquefaction and flow failures, especially as it relates to temporary construction slopes that may pose a hazard to construction crews. Cone penetration data from a CCR design project will be used to demonstrate the procedure to provide a real-world example.
Document Type
Presentation
Archival?
Archival
Included in
Energy Systems Commons, Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Mining Engineering Commons, Oil, Gas, and Energy Commons, Structural Materials Commons, Sustainability Commons
Application of Mine Tailings Flow Failure Assessment on CCR
Lexington, Kentucky
A new geotechnical stability analysis method has been implemented for a CCR surface impoundment to aid in design for temporary cut slopes and final closure grades. Conditions have come to light after significant tailings dam failures occurred across the globe, specifically those exhibiting flow failures (i.e. failures in which tailings behave a liquid and flow out of the facility). These failures have come under intense scrutiny as the failures pose significant risk to public safety and the environment and have been observed in CCR. Additionally, static liquefaction has arisen as another potential but less well understood causative mechanism. As the mining industry pivots to account for these considerations in design of tailings management facilities, a procedure was developed by Timothy Stark, Jiale Lin, and Hyunil Jung and published in 2023 to assess susceptibility of mine tailings to static liquefaction, seismic liquefaction, and reduced “yield” strengths due to excess pore pressure development, as well as assess slope stability against static liquefaction and flow failures. Can these lessons and procedures be expanded to the CCR industry and aid practitioners and owners in mitigating the risks associated with static liquefaction and flow failures of CCR? This presentation will provide an overview of the procedure and explore the applicability of this procedure to CCR and the susceptibility of CCR to static liquefaction and flow failures, especially as it relates to temporary construction slopes that may pose a hazard to construction crews. Cone penetration data from a CCR design project will be used to demonstrate the procedure to provide a real-world example.
