Generic thermo-mechanical model for jointed rock masses Page: 3 of 35
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Generic thermo-mechanical model for jointed rock masses
Oleg Vorobiev
Lawrence Livermore National Laboratory
L-206,P.0. Box 808, 7000 East Avenue, Livermore, CA 94551
vorobievl@llnl.gov
Abstract
A new nonlinear thermo-mechanical model for heavily jointed rock masses is presented.
The model describes poroelasticity, shear-enhaced compaction and brittle-ductile transition in
porous dry rocks. The basic input parameters in the model such as elastic moduli, tensile and
compressive strength are expressed as functions of the reference porosity of the rock. These
functions are based on empirical data for some types of rocks (limestones, sandstones). The
model assumes that the media is isotropic. Effects of joints is modelled by scaling down the key
model parameters. The scaling rules rely on empirical data but can also be found from direct
comparison with the explicit simulation of jointed rock masses
Keywords: geological material, rock, constitutive behaviour, yield condition, plastic
collapse
1. Introduction
Modeling thermo-mechanical response of jointed rock presents a challenge even for
small deformations. This is because both the joints and the rock may exhibit strongly non-linear
mechanical response, anisotropy and rate dependence. Large-scale in situ tests are expensive and
in some cases not possible. In Situ tests generally provide information on P-wave and S-wave
velocities as well as the joint spacing but not on the failure surface for the confined rock masses.1
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Vorobiev, O. Generic thermo-mechanical model for jointed rock masses, article, July 30, 2007; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc900095/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.