Premium
An extension of rate and state theory to poromechanics
Author(s) -
Karner Stephen L.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl024934
Subject(s) - poromechanics , biot number , geotechnical engineering , compaction , geology , state variable , deformation (meteorology) , mechanics , constitutive equation , granular material , geomechanics , physics , porous medium , thermodynamics , porosity , oceanography , finite element method
Laboratory results on granular media have lead to fundamental theoretical developments (such as poroelasticity, rate‐ and state‐variable friction) that have found widespread application. This paper presents results from laboratory experiments that help constrain and combine these theories. Data from triaxial deformation experiments on quartz sand aggregates are used to illustrate stress‐dependent behavior of poroelastic parameters (e.g., the Biot‐Willis coefficient). The results from both volumetric compaction and frictional shear experiments are well described by poroelasticity as well as rate‐ and state‐variable friction. The combination of these constitutive relations may provide a powerful tool that can be used in numerical models that couple mechanical, hydraulic, and temporal processes in the descriptions of granular deformation.