DTIC ADA079942: Soil Strain Measurements on Misers pdf

DTIC ADA079942: Soil Strain Measurements on Misers

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Soil strain measurements were made on the MISERS BLUFF – Phase II tests. The first test, a 109 metric ton ANFO explosion, indicated that the tubular, telescoping strain gage with large end plates and a DC LVDT sensing element should be adequate to measure strains on the second test which was the detonation of six 109 metric ton ANFO charges on the corners of a 100 m hexagon. The strains observed on the second event were much larger than on the first event. Three locations were instrumental to 1.6 m in depth for vertical strain, two halfway between charges on opposite sides of the array and one 6 m from the array center. The strains were initially compressive due to air shock loading and then extensional during the negative phase. Extensional strains greater than 50% were observed at the 6 m location down to a depth of 0.9 m.

The air shock loading at the locations between charges was not the same, nor were the soils identical. Strains of -12% to +30% were typical at near surface locations. The final or residual strain measured on recovery was usually compressive except at one location where the soil was very powdery. (Author

• Creator/s: Defense Technical Information Center
• Date: 4/30/1979
• Year: 1979
• Book Topics/Themes: DTIC Archive, Shunk, R A, ELECTROMECHANICAL SYSTEMS OF NEW MEXICO INC ALBUQUERQUE, *NUCLEAR EXPLOSION SIMULATION, *SOILS, *STRAIN GAGES, GROUND SHOCK, STRAIN(MECHANICS), SOIL MECHANICS, VOIDS, ALLUVIUM, BLAST, HIGH EXPLOSIVES, FUEL OIL, COMPRESSIVE PROPERTIES, SILT, AMMONIUM NITRATE

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