Presentation: Monitoring Stability While Stacking Fly Ash During the Kingston Recovery Project

May 24, 2019

Presented at the World of Coal Ash 2019 Conference—this paper reviews the experience gained during the Kingston Recovery Project

By Alan Rauch, Michael Steele, Kirk Jenkins, and Jim Andrew

 

Stability is a primary concern when stacking CCR materials over saturated deposits of fly ash. Excess pore pressures can accumulate in the ash during rapid loading and activate undrained foundation failures. In some CCR materials, small deformations can trigger static liquefaction. However, if the stacking operations are carefully planned and controlled, stable embankments can be built over fly ash. Subsurface instrumentation and a robust monitoring program are often essential. This paper reviews the experience gained during the Kingston Recovery Project. Following the 2008 failure, TVA dredged the adjacent river, processed the recovered ash slurry, and gradually dried the material to manageable moisture contents. 

 

About the Authors

Alan Rauch, PhD is a technical leader within Stantec's geotechnical engineering practice. His areas of technical expertise include soil strength, slope stability, seepage, liquefaction, and seismic performance for dams and other earth structures.

Michael Steele is a principal with Stantec, his experience includes landfill design and permitting, geotechnical explorations, liquefaction analyses, stability and deformation analyses, settlement analyses, cost estimating, contract administration, construction monitoring, and reporting.

Kirk Jenkins is a geotechnical engineer with Stantec, he specializes in seepage modeling, slope stability analysis, ground response, seismic deformation analysis, levee and earth dam surveys/evaluations/assessments, analyzing soil parameters, data collection, data analysis and reporting.

Jim Andrew is a senior project engineer with Stantec, his experience consists of laboratory testing of construction materials(asphalt, concrete, aggregates and soils) , conventional geotechnical explorations; shallow foundations; building condition surveys; pavement design; bearing capacity/settlement analysis; drilled shaft inspection; crack monitoring, multi phase testing/inspection; and project management. 

 

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