Preliminary Geotechnical Investigation: Panhandle Reservoir No. 1 and Appurtenances. Final Technical Report, November 1980-May 1982

摘要

The site of the proposed Panhandle Reservoir No. 1 is suitable for development of the proposed project from a geotechnical point of view. The maximum embankment section should consist of an impervious central core, Zone 1; a semi-previous shell on either side of the Zone 1 and part of the core, Zone 1A; an upstream previous shell, Zone 2; a downstream shell of miscellaneous materials, Zone 4; and a chimney drain and downstream drainage blanket, Zone 3. Suitable materials for all of the required construction are located in the immediate vicinity of the dam with the exception of the stone required for the riprap, riprap bedding, and gabions. This stone will have to be imported from off site. Reduction of seepage through the dam foundation and abutments requires stripping of the upper soils, construction of a shallow keyway trench, and grouting of the bedrock. If additional seepage reduction is required, additional methods such as positive cutoff through the upper more permeable bedrock or an upstream impervious blanket will be required. The dam should be monitored with frequent visual surveillance and instrumentation including surface displacement monuments, piezometers, and inclinometers. The maximum proposed embankment section and foundation have adequate strength to withstand the expected seismic and static loadings with a satisfactory factor of safety. (ERA citation 08:004029)