Stress Wave Propagation in Unsaturated Sands. Volume 2. Field Explosive Tests
Final rept. Sep 1990-Oct 1992
COLORADO STATE UNIV FORT COLLINS
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Explosive field tests were conducted in unsaturated Poudre Valley sand for the determination of peak ground shock parameters, propagation velocity and attenuation trends as a function of compactive saturation. The sand was compacted moist to a dry density of 1635 kgcu.m at compactive saturation levels ranging from 0 to 70 percent. Three explosive masses of 6.22 kg, 7.0 kg and 0. 227 kg TNT equivalency were used at a depth of burial of 1.4 meters to provide scaled range RWexp 13 values ranging from 0.32 mkgexp 13 to 3.8 m kgexp 13. Scaled peak particle acceleration, peak particle velocity, peak stress and propagation velocities are presented as a function of scaled range. Constants Y-intercept at RWexp 13 1 taken from the developed empirical predictive equations for peak ground shock parameters are generally lower but follow the same trends as those of Tyndall Beach and Ottawa 20-30 sands obtained from centrifuge tests. Slope -n or n-1 values taken from the same predictive velocity intercepts are lowest at 0 and 13 percent compactive saturations.
- Soil Mechanics