Journal
ACTA GEOTECHNICA
Volume 1, Issue 2, Pages 89-106Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-006-0010-z
Keywords
Plasticity; Viscoplasticity; Strain-rate sensitivity; Rock mechanics; Geomechanics; Kolsky bar; Shock loading
Categories
Funding
- Advanced Simulation and Computing Physics and Engineering Models Program
- United States Department of Energy [DE-A04-94AL85000]
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This paper summarizes the results of a theoretical and experimental program at Sandia National Laboratories aimed at identifying and modeling key physical features of rocks and rock-like materials at the laboratory scale over a broad range of strain rates. The mathematical development of a constitutive model is discussed and model predictions versus experimental data are given for a suite of laboratory tests. Concurrent pore collapse and cracking at the microscale are seen as competitive micromechanisms that give rise to the well-known macroscale phenomenon of a transition from volumetric compaction to dilatation under quasistatic triaxial compression. For high-rate loading, this competition between pore collapse and microcracking also seems to account for recently identified differences in strain-rate sensitivity between uniaxial-strain plate slap data compared to uniaxial-stress Kolsky bar data. A description is given of how this work supports ongoing efforts to develop a predictive capability in simulating deformation and failure of natural geological materials, including those that contain structural features such as joints and other spatial heterogeneities.
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