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Title: A thermomechanical anisotropic continuum model for geological materials with multiple joint sets

Abstract

Joints in geological materials introduce elastic compliance and weak planes on which sliding can occur. Although these materials can have multiple joint sets, they often have preferred orientations that cause both elastic and inelastic anisotropic response even when the unjointed material is isotropic. Azimuthal variations in radial velocity and polarity of tangential motion have been observed in experimental data for wave propagation caused by an initially spherical source in a geological material with multiple joint sets. This observed tangential ground motion was found to be related to mechanical anisotropy caused by preferred orientations of joints in the rock. This paper describes thermomechanical continuum constitutive equations, which model the effects of multiple persistent joint sets. A number of quasi–static examples are considered, which show that the proposed model predicts anisotropic effects of sliding on multiple joint sets similar to those exhibited by computationally expensive mesoscale calculations, which model joint sets explicitly.

Authors:
ORCiD logo [1];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Technion-Israel Institute of Technology, Haifa (Israel)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1513835
Alternate Identifier(s):
OSTI ID: 1436814
Report Number(s):
LLNL-JRNL-746369
Journal ID: ISSN 0363-9061; 930314
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
International Journal for Numerical and Analytical Methods in Geomechanics
Additional Journal Information:
Journal Volume: 42; Journal Issue: 12; Journal ID: ISSN 0363-9061
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; anisotropic plasticity; jointed rock; mesoscale simulations; thermomechanical model

Citation Formats

Vorobiev, O. Yu., and Rubin, M. B. A thermomechanical anisotropic continuum model for geological materials with multiple joint sets. United States: N. p., 2018. Web. doi:10.1002/nag.2795.
Vorobiev, O. Yu., & Rubin, M. B. A thermomechanical anisotropic continuum model for geological materials with multiple joint sets. United States. doi:10.1002/nag.2795.
Vorobiev, O. Yu., and Rubin, M. B. Thu . "A thermomechanical anisotropic continuum model for geological materials with multiple joint sets". United States. doi:10.1002/nag.2795. https://www.osti.gov/servlets/purl/1513835.
@article{osti_1513835,
title = {A thermomechanical anisotropic continuum model for geological materials with multiple joint sets},
author = {Vorobiev, O. Yu. and Rubin, M. B.},
abstractNote = {Joints in geological materials introduce elastic compliance and weak planes on which sliding can occur. Although these materials can have multiple joint sets, they often have preferred orientations that cause both elastic and inelastic anisotropic response even when the unjointed material is isotropic. Azimuthal variations in radial velocity and polarity of tangential motion have been observed in experimental data for wave propagation caused by an initially spherical source in a geological material with multiple joint sets. This observed tangential ground motion was found to be related to mechanical anisotropy caused by preferred orientations of joints in the rock. This paper describes thermomechanical continuum constitutive equations, which model the effects of multiple persistent joint sets. A number of quasi–static examples are considered, which show that the proposed model predicts anisotropic effects of sliding on multiple joint sets similar to those exhibited by computationally expensive mesoscale calculations, which model joint sets explicitly.},
doi = {10.1002/nag.2795},
journal = {International Journal for Numerical and Analytical Methods in Geomechanics},
number = 12,
volume = 42,
place = {United States},
year = {2018},
month = {5}
}

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