The effect of micro-structure on the macroscopic behavior of cemented granular material

Technical Report · Thu Dec 31 23:00:00 EST 1987

OSTI ID:5191807

Trent, B C

In order to improve the physical understanding of the phenomenology associated with the deformation of highly porous geologic materials such as alluvium, the details of inter-granular rolling, shearing and extension have been studied for cemented particles. Two-dimensional analytic expressions are derived that relate the response of two bonded particles to deformations of an elastic adhesive material. A two-dimensional version of the distinct element code, TRUBAL, was modified by incorporating these analytic relations into the calculational sequence. A modified Griffith criterion isused to trigger inter-particle fracture in quasi-static and dynamic regimes. The details of the implementation of these features into TRUBAl are decribed and the necessary modifiations to the stress tensor calculation are developed. The evolution of multiple particle clusters is investigated in several quasi-static and dynamic numerical experiments. The calculational results are compared to laboratory data and macroscopic constitutive laws. Scanning electron micrographs and thin section photomicrographs are provided, illustrating some strengths and limitations of the model. 50 refs., 153 figs., 8 tabs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5191807
• Report Number(s): LA-11169-T; ON: DE88007157
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ALLUVIAL DEPOSITS
CEMENTING
COMPUTER CODES
CRYSTAL STRUCTURE
DEFORMATION
ELECTRON MICROSCOPY
GEOLOGIC DEPOSITS
MATERIALS
MATHEMATICAL MODELS
MECHANICS
MICROSCOPY
MICROSTRUCTURE
PARTICLES
POROUS MATERIALS
ROCK MECHANICS
ROCKS
SCANNING ELECTRON MICROSCOPY
SEDIMENTARY ROCKS
STRESS ANALYSIS
T CODES