Accession Number:

ADA162063

Title:

Three-Dimensional Elasto-Plastic Analysis for Soils.

Descriptive Note:

Annual rept. 15 Jun-14 Aug 85,

Corporate Author:

HYDROSPACE RESEARCH CORP ROCKVILLE MD PHYSICAL ACOUSTICS DIV

Personal Author(s):

Report Date:

1985-09-26

Pagination or Media Count:

170.0

Abstract:

This report presents the first year accomplishments perfecting the elasto-plastic soil constitutive equations of Hardin 1978 and their implementation into EPSAP Elasto-Plastic Soil Analysis Program. The elasto-plastic soil constitutive equations reflect the essential features of soil behavior that result from the soil skeleton being particulate. Constitutive equation modeling improvements include 1 crushing of soil particles, 2 strength of soils in terms of effective stress, and 3 modification of the class 1 plastic potential function. EPSAP is a three-dimensional finite element code which is being developed as part of the research. The developments for EPSAP include expressing the two classes of soil loading in matrix form and their subsequent finite element implementation. EPSAP includes a three node line load element, six node triangular and eight node quadrilateral surface load elements, and fifteen node prism and twenty node hexahedron domain elements. A predictor-corrector solution algorithm for solving the nonlinear equation and the out-of-core nonsymmetric skyline solver are discussed. Results for a triaxial compression simulation are presented. Keywords Elasto-plastic Finite element Nonlinear Soils Three-dimensional.

Subject Categories:

  • Soil Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE