Accession Number:

ADA297858

Title:

Micromechanics and Constitutive Modeling of Granular Materials in Stress Reversal and Cyclic Loading.

Descriptive Note:

Final technical rept. 1 Oct 91-30 Nov 94,

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA

Personal Author(s):

Report Date:

1995-06-12

Pagination or Media Count:

186.0

Abstract:

The work performed under this grant, focused on fundamental research on cyclic response and response in unloading and stress reversal regimes of granular materials. The research program included a careful examination of grain-to-grain interaction during load reversal, which results in a dramatic change in the overall response of granular materials, from loading to unloading. This was then followed by a fundamental examination of the cyclic response of granular materials under confinement, with repeated stress reversals. Parallel with the theoretical work, the research program included a series of coordinated experiments using UCSDs special large hollow cylindrical load cell and the biaxial and simple shearing load frames with photoelastic granules. These experiments served several specific purposes 1 appropriately incorporating lead shot in the large hollow cylindrical sample, a series of X-ray photographs were taken to identify the micromechanical response during load reversal 2 densification andor dilatancy measurements in load reversal and cyclic loading provided guidance for the theoretical work 3 by direct observations, using the biaxial and simple shearing facilities, micromechanical changes in unloading, load reversal, and cyclic loading were examined with the ald of photoelastic granules and 4 controlled independent experiments were used to validate the resulting models, and to evaluate the key parameters. MM

Subject Categories:

  • Soil Mechanics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE