The Leading Edge · 1990 · 20 citations · 0 references
EngineeringEarth SciencesGeophysicsEngineering GeologyFoundation EngineeringGeotechnical EngineeringDam GeologyEngineering Geological MappingEngineering GeophysicsFoundation GeologyDam - Foundation InteractionDam FoundationsEmbankment DamsFoundationGeotechnical CharacterizationGeotechnical Site InvestigationGraben StructuresSeepage Analysis
The study focuses on Beaver Dam, Arkansas, where anomalous seepage beneath Dike 1 has been linked to a down‑faulted, weathered limestone/dolomite block forming a graben structure. The authors aim to evaluate the seepage history, site geology, and foundation grouting programs to devise remedial measures that reduce or eliminate the seepage. Engineering geophysics techniques were employed to detect, map, and monitor seepage pathways and to delineate the underlying geologic structure beneath Dike 1. A plan map (Figure 17) delineates the north and south bounding fault zones of the graben structure beneath Dike 1.
Part 1 of this paper (TLE, August 1989) reviews recent geotechnical investigations conducted at Beaver Dam, Arkansas. The problem addressed was anomalous seepage beneath Dike 1, adjacent to the main embankment dam. The paper presents a summary of the site geology, seepage history, and foundation grouting programs. Figure 17 is a plan map showing the north and south bounding fault zones of a graben structure beneath Dike 1. The foundation is a down‐faulted block of severely weathered limestone/dolomite of the Boone formation. Figure 4 of part 1 shows a simplified geologic cross‐section through Dike 1 showing the graben structure. Overall objectives of the geotechnical investigations were to assess the anomalous seepage and plan remedial measures to eliminate or significantly abate the seepage. The engineering geophysics investigations discussed in part 1 were designed to detect, map, and monitor anomalous seepage paths and delineate geologic structure beneath Dike 1.