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Material Response Models and Ground Motion Calculations for High Explosive Tests in G-Tunnel Tuff.
PACIFICA TECHNOLOGY DEL MAR CA
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Numerical material response models developed from static laboratory material response measurements and from dynamic explosive test data are described. Material models were first specified using only laboratory test data obtained by Terra Tek. Predictions using this model were then compared to dynamic stress and velocity data taken by SRI International in very small 38 gm PETN explosive shots, and by Sandia Laboratories in a much larger scale 2000 lb. TNT ONE-TON test. All laboratory measurements and SRI shots used tuff samples taken from the Sandia ONE-TON test site located in G-Tunnel at the Nevada Test Site. A new material model was constructed to agree as closely as possible with the SRI data and a second prediction for the ONE-TON event was made. Overall the ONE-TON predictions were quite good if the expected bias in air-void content was considered, with the model using the SRI results doing slightly better. The comparisons highlighted concerns about the measured air-void content and uncertainties in the strain rate dependence of material properties. Models including dilatation and viscoelastic effects were developed and predictions from these models are compared with the test data. The viscoelastic model was quite successful at both the SRI and ONE-TON scale. The dilatation model had some encouraging features but requires additional data and development.
APPROVED FOR PUBLIC RELEASE