Spherical Waves in Saturated Sand.
Final rept. Sep 94-Sep 95,
SRI INTERNATIONAL MENLO PARK CA
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The Naval Surface Warfare Center needs to develop the capability to determine numerically the characteristics of a propagating stress wave in saturated sand. To provide needed experimental data, SRI International performed precision experiments with the objective of measuring saturated sand material response resulting from the detonation of a spherical explosive charge. The instrumentation consisted of particle velocity gages as the primary measurement tool and stress gages as a secondary measurement tool. Four experiments were performed using Eglin Beach sand at nominal saturation levels of 100, 95, and 78, and 77. The particle velocity time histories of the 100 and 78 saturated sand models showed 20 higher peak particle velocities in the 78 saturated sand model at ranges up to 2.04 cm from the charge and 30 lower peak particle velocities in the 78 saturated sand model at ranges beyond 3.05 cm from the charge. The higher peak particle velocity in the 78 saturated sand model near the charge is due to the lower inertial resistance because of less water in the pore space. The lower peak particle velocity in the 78 saturated sand model farther away from the charge is the result of larger attenuation of the particle velocity.