Accession Number:

AD0837225

Title:

EFFECT OF BACKPACKING ON STRUCTURE-MEDIUM INTERACTION.

Descriptive Note:

Technical rept. Nov 66-Mar 68,

Corporate Author:

NEW MEXICO UNIV ALBUQUERQUE ERIC H WANG CIVIL ENGINEERING RESEARCH FACILITY

Personal Author(s):

• Linger, Don A.

Report Date:

1968-07-01

Pagination or Media Count:

104.0

Abstract:

A soft crushable layer of material used as backpacking was placed between a buried structure and the surrounding granular soil. Its effect on the pressures and motions transmitted to the structure by the soil was studied. The variables included the strength, thickness, and density of the backpacking and the size of the buried structure. Small rigid cylindrical structures were used in laboratory and field tests. The results show the measured pressures, velocities, and accelerations transmitted through the backpacking. The transmitted pressure was found to be a function of yield-point stress of the backpacking material. The transmitted accelerations and velocities were found to be reduced by the backpacking. The acceleration was reduced to a value of one-half to one-fifth of the acceleration of the unbackpacked structures, and the velocity was reduced to approximately 80 to 90 percent of the velocity of the unbackpacked structures. Author

Descriptors:

• *SOIL MECHANICS
• UNDERGROUND STRUCTURES
• NUCLEAR EXPLOSIONS
• ABSORPTION
• SHOCK WAVES
• EXPLOSIONS
• COMPRESSIVE PROPERTIES
• PLASTIC PROPERTIES
• STIFFENED CYLINDERS
• MATHEMATICAL MODELS
• LOADS(FORCES)
• PRESSURE
• TEST METHODS
• FOAM
• CONCRETE

Subject Categories:

• Soil Mechanics
• Structural Engineering and Building Technology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE