Accession Number:

AD0633802

Title:

A RHEOLOGIC INVESTIGATION OF THE DYNAMIC RESPONSE SPECTRA OF COHESIVE SOILS.

Descriptive Note:

Contract rept. (Summary),

Corporate Author:

KONDNER RESEARCH DEERFIELD IL

Personal Author(s):

Report Date:

1965-11-01

Pagination or Media Count:

105.0

Abstract:

Theoretical and experimental studies of the stress -strain-time- strength response of cohesive soils in unconfined compression under blast pulse, creep, and vibratory loadings covering wide ranges of variables are presented in terms of unified viscoelastic response spectra through the use of a nondimensional parameter denoted as the soil compliance a reciprocal form of strain dependent, nondimensional soil modulus. Nonlinearity of the response is handled through the use of a hyperbolic stress-strain relation. The time spectrum covered by such response spectra varies from less than one millisecond to more than 1 x 10,000 minutes -- a range of over nine decades of time corresponding to loading conditions involving the very small times associated with characteristic time parameters of nuclear blast loading to the long time creep type of loadings associated with the static weight of protective construction systems. Moisture contents range from approximately 18 per cent to 41 per cent and include the range of soil consistencies and strengths 0.3 kg. per sq. cm. to more than 15 kg. per sq. cm. generally encountered in field applications. Applied stress levels vary from approximately 0.7 per cent of the soil strength all the way to failure. Strain levels investigated range from 0. 0003 per cent to more than 22 per cent and consideration is given to elastic and plastic strains. Various aspects of wave propagation are presented in terms of the response spectra. Author

Subject Categories:

  • Soil Mechanics
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE