Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/20967
Title: In situ seismic investigation Isabella Project, California
Authors: Soils and Pavements Laboratory (U.S.)
United States. Army. Corps of Engineers. Sacramento District.
Landers, Glenn B.
Curro, Joseph R.
Keywords: Compression waves
Isabella Project
Lake Isabella
Isabella Dam
California
Crosshole test
Seismic refraction
Geology
Geophysical investigation
Shear waves
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: An in situ seismic investigation consisting of surface refraction seismic, downhole, and crosshole tests was conducted at Lake Isabella, near Bakersfield, California. Compression and shear wave (P- and S-wave) velocities as a function of depth were determined for the main and auxiliary dams and underlying foundation materials. Results at the main dam indicated four P-wave velocity zones from a surface refraction seismic line located along the crest of the dam. These zones had velocities of (A.) 1,750, (B.) 2,550, (C.) 8,050, and (D.) 18,450 fps, which corresponded to (A.) random fill material, (B.) the central impervious core, (C.) weathered granite, and (D.) fresh granite. Velocity data from crosshole and downhole tests conducted on the downstream face of the main dam indicated three P- and S-wave velocity zones. The respective P- and S-wave velocities were (A.) 2,000 and 950 fps, (B.) 3,750 and 1,300 fps, and (C.) 16,700 and 4,700 fps, which corresponded to (A.) and (B.) random fill material, and (C.) granite. The P- and S-wave velocities of 3,750 and 1,300 fps, respectively, were established for the alluvium and horizontal drainage layer. Data at the auxiliary dam were given two separate interpretations. The primary interpretation established three basic P- and S-wave velocity zones with respective velocities of (A.) 2, 850 and 1,150 fps for the embankment, (B.) 6,600 and 1, 600 fps for the foundation to bedrock, and (C.) 12,100 and 3,300 fps for granite bedrock. The alternate interpretation provided a more detailed profile. Nine P-wave and eight S-wave velocity zones were established ranging from a low of 2,450 and 1,000 fps (P- and S-wave, respectively) to a high of 13,400 fps ( P-wave) and 3,750 fps (S-wave) for fractured granite.
Rights: Approved for public release; distribution is unlimited.
URI: http://hdl.handle.net/11681/20967
Appears in Collections:Miscellaneous Paper

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