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|Title:||Vibro-seismic survey, high-stability AEC structure, Oak Ridge, Tennessee|
|Authors:||U.S. Atomic Energy Commission.|
Fowler, Jack, 1938-
Hadala, Paul F.
|Publisher:||U.S. Army Engineer Waterways Experiment Station.|
Engineer Research and Development Center (U.S.)
Abstract: The results of the vibro-seismic surveys indicated three velocity zones at sites 1 and 3 and two zones at site 2. Shear wave velocities at site 1 varied from 960. to 3360 fps, and shear moduli varied from 24,000 to 366,000 psi from near the surface to a depth of 126 ft. Shear wave velocities at site 2 varied from 720 to 1600 fps, and shear moduli varied from 15,000 to 83,000 psi from near the surface to a depth of 89 ft. Shear wave velocities at site 3 varied from 1150 to 4500 fps, and shear moduli varied from 37,000 to 540,000 psi from near the surface to a depth of about 130 ft. Poisson's ratios varied from 0.39 to 0.50; Young's moduli were approximately three times the shear modulus. The rate of decay of a vibratory signal with distance was about the same at each site. The attenuation exponents or rate of decay of the vibratory signal varied from -1.17 to -1.52, and the magnitude of the particle velocity (peak-to-peak) intercept ranged from -1.5 to ~5.6 ips at a unit distance plotted on a log scale. The normal background noise in the building was about 0.005 ips or about three times the signal induced by the vibrator at a force level of 19,400 lb at a point on the ground surface outside the laboratory building. There was no significant increase in the particle velocity when the eccentric force was doubled. Explosive attenuation tests conducted in the overburden and bedrock materials indicated that the attenuation exponent or rate of decay was about -1.83 for each site. The explosive charges used in these tests were 1, 2, 4, 7, and 8 lb. The nearest charge was a 1-lb charge located about 335 ft from the laboratory building. The maximum peak-to-peak particle velocity in the laboratory building was 0.055 ips (radial) and the frequencies ranged from 12 to 55 Hz. The peak-to-peak velocity intercepts ranged from about 1,750 to 10,350 ips for the bedrock tests and were about 2,050 ips for the overburden tests. There was no difference in attenuation of the signal at the sites. The background noise level was about 0.005 ips and the frequency ranged from 15 to 130 Hz. During the conduct of these tests, there was no motion felt or effects of motion observed by the Union Carbide personnel within the laboratory building.
|Rights:||Approved for public release; distribution is unlimited.|
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