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Laboratory Investigation of Containment of Underground Explosions.
SRI INTERNATIONAL MENLO PARK CA
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In support of the DNA program for stemming and containment of underground nuclear tests, laboratory techniques were applied to investigate the mechanics of containing gases in cavities formed by underground nuclear explosions. One experimental technique uses constant flow rate hydrofracture from a central exploded cavity in a cylinder of geologic material or simulant externally pressurized to represent overburden. A second experimental technique uses the measurement of particle velocity in the material surrounding an exploded cavity to provide outward and rebound motion at several radii for geologic materials and simulants. Additional experimental techniques use direct measurements of the transient and long-term stress and strain surrounding an exploded cavity. Hydrofracture, particle velocity, stress, and strain results for a rock-matching grout representing saturated Nevada Test Site tuff show the following A beneficial residual stress forms around and exploded cavity, and containment of gases is achieved at normal overburden. Permanent volume compression exists in the region surrounding an exploded cavity. Containment may be possible with depth-of-burial and overburden less than those of normal practice. Strain rate changes do not have significant effect on particle velocity when the scale factor is doubled.
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