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Title: In situ geophysical investigation to evaluate dynamic soil properties at Success Dam, California
Authors: United States. Defense Nuclear Facilities Safety Board.
United States. Army. Corps of Engineers. Sacramento District.
Llopis, José L.
Lee, Landris T.
Green, Russell A.
Keywords: Compression wave
Electromagnetic logs
Gamma logs
Seismic refraction
Shear wave
Success Dam, California
Soil dynamics
Geophysical exploration
Geophysical surveys
Earthquake risk
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-97-8.
Description: Technical Report
Abstract: An in situ geophysical investigation was conducted at Success Dam, California, to determine the shear-wave (S-wave) velocities of the dam and foundation. The S-wave values are used in conjunction with conventional field and laboratory soil testing methods to provide soil property values for an earthquake analysis of the dam and foundation. The investigation consisted of S-wave crosshole and S-wave and compression-wave (P-wave) surface seismic refraction tests along with downhole conductivity and gamma logging. S-wave velocities as a function of depth were determined for the upstream and downstream shell of the dam as well for the alluvium foundation. The crosshole results indicate an average true S-wave velocity range of between 500 and 1,100 fps for the upstream shell and 700 and 1,400 fps for the downstream shell. The crosshole results indicate that the average true S-wave velocities for the alluvium foundation beneath the upstream shell vary between 700 and 2,000 fps and between 1,800 and 2,200 fps below the downstream shell. The crosshole S-wave tests indicate an average true velocity range of between 650 and 1,750 fps along the downstream toe of the dam. Seismic refraction S-wave results run along the downstream toe indicate true velocities between 400 and 5,125 fps. The crosshole S-wave velocity profiles show velocities increasing with depth at a lower rate for the upstream shell materials than for the downstream shell materials. Anomalously low crosshole S-wave velocities are found in the upstream shell and alluvium at Sta. 28+80.
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