On the strength of transversely isotropic rocks: On the strength of transversely isotropic rocks
Abstract
Accurate prediction of strength in rocks with distinct bedding planes requires knowledge of the bedding plane orientation relative to the load direction. Thermal softening adds complexity to the problem since it is known to have significant influence on the strength and strain localization properties of rocks. In this paper, we utilize a recently proposed thermoplastic constitutive model appropriate for rocks exhibiting transverse isotropy in both the elastic and plastic responses to predict their strength and strain localization properties. Recognizing that laboratory-derived strengths can be influenced by material and geometric inhomogeneities of the rock samples, we consider both stress-point and boundary-value problem simulations of rock strength behavior. Both plane strain and 3D loading conditions are considered. Results of the simulations of the strength of a natural Tournemire shale and a synthetic transversely isotropic rock suggest that the mechanical model can reproduce the general U-shaped variation of rock strength with bedding plane orientation quite well. We show that this variation could depend on many factors, including the stress loading condition (plane strain versus 3D), degree of anisotropy, temperature, shear-induced dilation versus shear-induced compaction, specimen imperfections, and boundary restraints, among others.
- Publication Date:
- Research Org.:
- Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1596338
- Grant/Contract Number:
- [FG02-03ER15454; CMMI‐1462231; DGE‐114747]
- Resource Type:
- Accepted Manuscript
- Journal Name:
- International Journal for Numerical and Analytical Methods in Geomechanics
- Additional Journal Information:
- [ Journal Volume: 42; Journal Issue: 16]; Journal ID: ISSN 0363-9061
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Anisotropy; bifurcation; rock strength; shear band; thermoplasticity; transverse isotropy
Citation Formats
Zhao, Yang, Semnani, Shabnam J., Yin, Qing, and Borja, Ronaldo I. On the strength of transversely isotropic rocks: On the strength of transversely isotropic rocks. United States: N. p., 2018.
Web. doi:10.1002/nag.2809.
Zhao, Yang, Semnani, Shabnam J., Yin, Qing, & Borja, Ronaldo I. On the strength of transversely isotropic rocks: On the strength of transversely isotropic rocks. United States. doi:10.1002/nag.2809.
Zhao, Yang, Semnani, Shabnam J., Yin, Qing, and Borja, Ronaldo I. Thu .
"On the strength of transversely isotropic rocks: On the strength of transversely isotropic rocks". United States. doi:10.1002/nag.2809. https://www.osti.gov/servlets/purl/1596338.
@article{osti_1596338,
title = {On the strength of transversely isotropic rocks: On the strength of transversely isotropic rocks},
author = {Zhao, Yang and Semnani, Shabnam J. and Yin, Qing and Borja, Ronaldo I.},
abstractNote = {Accurate prediction of strength in rocks with distinct bedding planes requires knowledge of the bedding plane orientation relative to the load direction. Thermal softening adds complexity to the problem since it is known to have significant influence on the strength and strain localization properties of rocks. In this paper, we utilize a recently proposed thermoplastic constitutive model appropriate for rocks exhibiting transverse isotropy in both the elastic and plastic responses to predict their strength and strain localization properties. Recognizing that laboratory-derived strengths can be influenced by material and geometric inhomogeneities of the rock samples, we consider both stress-point and boundary-value problem simulations of rock strength behavior. Both plane strain and 3D loading conditions are considered. Results of the simulations of the strength of a natural Tournemire shale and a synthetic transversely isotropic rock suggest that the mechanical model can reproduce the general U-shaped variation of rock strength with bedding plane orientation quite well. We show that this variation could depend on many factors, including the stress loading condition (plane strain versus 3D), degree of anisotropy, temperature, shear-induced dilation versus shear-induced compaction, specimen imperfections, and boundary restraints, among others.},
doi = {10.1002/nag.2809},
journal = {International Journal for Numerical and Analytical Methods in Geomechanics},
number = [16],
volume = [42],
place = {United States},
year = {2018},
month = {7}
}
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