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High Pressure Properties of Several Nevada Test Site Tuffs.
TERRA TEK INC SALT LAKE CITY UTAH
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The average mechanical response up to about 4 kilobars pressure is presented for two underground test sites, Hudson Moon and Diana Mist. Reasonable similarity of high pressure response was observed from tests on cores taken over distances of tens of feet, thereby making modeling of each site sensible from relatively few laboratory tests. Although the compaction over the pressure range investigated was dominated by the amount of water in the tuff and the percent unfilled voids, in detail the compressibility is dependent upon the shear stress, as well as hydrostatic pressure. Tuffs which appear to be nominally fully saturated still contain some unfilled voids, of the order of 1-2. The major difference found between the Hudson Moon and Diana Mist sites was that the first 50-80 feet from the Hudson Moon working point was not nearly saturated and exhibited large permanent compaction. Author
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