Dynamic Properties of Rock Required for Prediction Calculations.
Final rept. 18 Jan 73-31 Aug 74,
STANFORD RESEARCH INST MENLO PARK CALIF
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Dynamic loading and unloading curves were measured to 29 kbar in wet and dry tuff from the Nevada Test Site, wet and dry sandstone from the Mixed Company site, and wet soil from the Essex site. The curves were obtained using multiple embedded gages that recorded particle velocity andor stress histories at up to four different depths in gas gun impact experiments. The Fowles-William analysis method was used to generate compression and release paths from these records. In dry tuff at low pressures, the stress wave is quite dispersive at higher pressures, it is much less so. Yielding occurs at about one kbar in dry tuff and at about four kbar in dry sandstone. Dispersion, yielding, and permanent compaction were less evident in the experiments with water-saturated sandstone.
- Geology, Geochemistry and Mineralogy