Development and Evaluation of Remediation Strategies by Deformation Analysis

by R. H. Ledbetter, U.S. Army Engineer Waterways, Experiment Station, Vicksburg, United States,
W. D. Liam Finn, U.S. Army Engineer Waterways, Experiment Station, Vicksburg, United States,



Document Type: Proceeding Paper

Part of: Geotechnical Practice in Dam Rehabilitation

Abstract:

Deformation analysis is providing guidance for the most efficient and economical seismic remedial treatments for Mormon Island Auxiliary and Sardis dams. The computer program TARA-3FL is being used to study the deformation responses of these dams with performance being evaluated for earthquake-induced strength loss and liquefaction in the embankment and foundation soils before and after remediation. Soil response and critical regions are identified where high strains and deformations begin to influence and control the performance of the dams. Deformation analysis indicates the most effective locations for remediation and helps define the spatial extent and associated material properties of remediated zones to ensure satisfactory seismic behavior of the dams. Remediation methods under consideration for these dams include dynamic compaction, stone columns, and steel reinforced concrete piles. Initial treatment with dynamic compaction has been conducted at Mormon Island.

Subject Headings: Soil deformation | Soil liquefaction | Soil analysis | Mitigation and remediation | Stress analysis | Soil treatment | Seismic tests

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