Accession Number:

ADA279115

Title:

Stress Wave Propagation in Unsaturated Sands. Volume 1. Centrifuge Modeling

Descriptive Note:

Final rept. Sep 1990-Oct 1992

Corporate Author:

COLORADO STATE UNIV FORT COLLINS

Personal Author(s):

Report Date:

1993-04-01

Pagination or Media Count:

133.0

Abstract:

Explosive model testing was conducted using a geotechnical centrifuge in order to simulate prototype stresses and ground motions in a representative cohesionless backfill. Models were constructed of sand and compacted moist to a constant void ratio using a vibratory technique. Exploding detonators were used to simulate contained bombs in the backfill material. The objective of this study was to determine the influence of moisture content, at the time of backfill compact ion, on blast induced stress wave propagation. Models were constructed to 118.9 and 126.3 scales. Explosives consisted of 1031 mg and 350 mg of PBX 9407 and were buried to depths of 7.6 cm and 5.4 cm respectively. These scaled models simulated prototype charges of 6.9 kg and 6.4 kg 7.8 kg and 7.3 kg TNT equivalent at a depth of burial of 1.4 meters. Attenuation coefficients n show some influence with respect to saturation. Peak stress and peak particle acceleration intercepts at a scaled distance of one are lowest at 0 and 53 percent saturations and are maximum at 35 percent saturation. Peak particle velocity intercepts are lowest at 0 and 70 percent saturations and again are maximum at 35 percent saturation.

Subject Categories:

  • Soil Mechanics
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE