Accession Number : AD0474690

Title :   STUDY OF THE DYNAMIC STRESS - STRAIN AND WAVE-PROPAGATION CHARACTERISTICS OF SOILS. REPORT 4. CONCEPTS OF SHOCK BEHAVIOR IN A GRANULAR MEDIUM,

Descriptive Note : Contract rept.

Corporate Author : UNITED RESEARCH SERVICES CORP BURLINGAME CA

Personal Author(s) : Zaccor, J. V. ; Wallace, N. R. ; Durbin, W. L. ; Mason, H. G.

Report Date : MAR 1965

Pagination or Media Count : 157

Abstract : This report summarizes current understanding of wave propagation in a cohesionless dry granular material in response to loadings suddenly applied and held at constant magnitude. Experimental studies of propagating waves were conducted in which measurements were made of stress and displacement, as a function of time and position along a column of granular material, so that the stress-strain relationship, and wave and particle velocities could be determined. The latter quantities, thus obtained from experimental measurements, have been compared with values obtained from applicable equations of state. A number of equations of state are considered. Two equations of state appropriate to rigid-pack conditions have been discussed. They apply to very different, but regular, packings of equi-radii elastic spheres where Hertz-type contact forces prevail and rearrangement of particles under loading is not allowed. These two equations of state were derived only from material properties of the individual particles and the packing arrangement. In addition, equations of state appropriate to conditions where particle relocations occur during loading have also been developed from the measured stress-strain relationship. From the equations of state, shock, sound, and particle velocities have been obtained as derived quantities and compared with those obtained from experiment. Excellent agreement has been found between experiment and theory. (Author)

Descriptors :   (*SOILS, SHOCK WAVES), PROPAGATION, SAND, SOIL MECHANICS, EQUATIONS OF STATE, LOADS(FORCES), STRESSES, PARTICLES, VELOCITY, NUCLEAR EXPLOSION DAMAGE, MECHANICAL WAVES.

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE