Accession Number : ADA183503

Title :   A Two-Dimensional Numerical Micromechanical Model for a Granular Soil at Small Strains.

Descriptive Note : Annual rept. 6 May 86-5 May 87,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CIVIL ENGINEERING

Personal Author(s) : Petrakis,Emmanuel ; Dobry,Ricardo

Report Date : JUN 1987

Pagination or Media Count : 37

Abstract : A new 2-D model of the stress-strain behavior of granular soil at small strains is presented. The model is based on an incremental solution to the contact problem and is implemented through nonlinear finite element techniques. The results of numerical experiments conducted on this idealized aggregate are compared to laboratory data on the static and cyclic small strain behavior of actual sand, as well as to recent compressional wave velocity measurements on anisotropically consolidated dry sand, with good agreement. These measurements, performed at the large cubic triaxial facility at the University of Texas, have shown that the P-wave velocity depends only on the principal stress parallel to the direction of wave propagation; this finding was also predicted by the simulation. A number of useful insight on the microscopic behavior of this idealized aggregate are also discussed. Keywords: Particulate mechanics; Stress-strain relationships; Small strains; P-wave velocity; Constrained modulus.

Descriptors :   *SAND, *STRESS STRAIN RELATIONS, *SOIL MECHANICS, DRY MATERIALS, EXPERIMENTAL DATA, FINITE ELEMENT ANALYSIS, NONLINEAR ANALYSIS, NUMERICAL METHODS AND PROCEDURES, SIMULATION, WAVE PROPAGATION, SOLUTIONS(GENERAL), MICROSCOPY, PARTICULATES, MEASUREMENT, VELOCITY, WAVES, TWO DIMENSIONAL, MATHEMATICAL MODELS, INTERFACES, ELASTIC PROPERTIES, SPHERES, STRAIN(MECHANICS)

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE