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Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone

The mechanical behavior of the sandstone at the dam site is important to the stability of the hydropower station to be built in Southwest China. A series of triaxial compression tests under different confining pressures were conducted in the laboratory. The critical stresses were determined and the...

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Autores principales: Jia, Chaojun, Zhang, Qiang, Wang, Susheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7435461/
https://www.ncbi.nlm.nih.gov/pubmed/32756343
http://dx.doi.org/10.3390/ma13153414
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author Jia, Chaojun
Zhang, Qiang
Wang, Susheng
author_facet Jia, Chaojun
Zhang, Qiang
Wang, Susheng
author_sort Jia, Chaojun
collection PubMed
description The mechanical behavior of the sandstone at the dam site is important to the stability of the hydropower station to be built in Southwest China. A series of triaxial compression tests under different confining pressures were conducted in the laboratory. The critical stresses were determined and the relationship between the critical stress and confining pressure were analyzed. The Young’s modulus increases non-linearly with the confining pressure while the plastic strain increment [Formula: see text] and the dilation angle ϕ showed a negative response. Scanning electron microscope (SEM) tests showed that the failure of the sandstone under compression is a coupled process of crack growth and frictional sliding. Based on the experimental results, a coupled elastoplastic damage model was proposed within the irreversible thermodynamic framework. The plastic deformation and damage evolution were described by using the micromechanical homogenization method. The plastic flow is inherently driven by the damage evolution. Furthermore, a numerical integration algorithm was developed to simulate the coupled elastoplastic damage behavior of sandstone. The main inelastic properties of the sandstone were well captured. The model will be implemented into the finite element method (FEM) to estimate the excavation damaged zones (EDZs) which can provide a reference for the design and construction of such a huge hydropower project.
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spelling pubmed-74354612020-08-28 Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone Jia, Chaojun Zhang, Qiang Wang, Susheng Materials (Basel) Article The mechanical behavior of the sandstone at the dam site is important to the stability of the hydropower station to be built in Southwest China. A series of triaxial compression tests under different confining pressures were conducted in the laboratory. The critical stresses were determined and the relationship between the critical stress and confining pressure were analyzed. The Young’s modulus increases non-linearly with the confining pressure while the plastic strain increment [Formula: see text] and the dilation angle ϕ showed a negative response. Scanning electron microscope (SEM) tests showed that the failure of the sandstone under compression is a coupled process of crack growth and frictional sliding. Based on the experimental results, a coupled elastoplastic damage model was proposed within the irreversible thermodynamic framework. The plastic deformation and damage evolution were described by using the micromechanical homogenization method. The plastic flow is inherently driven by the damage evolution. Furthermore, a numerical integration algorithm was developed to simulate the coupled elastoplastic damage behavior of sandstone. The main inelastic properties of the sandstone were well captured. The model will be implemented into the finite element method (FEM) to estimate the excavation damaged zones (EDZs) which can provide a reference for the design and construction of such a huge hydropower project. MDPI 2020-08-03 /pmc/articles/PMC7435461/ /pubmed/32756343 http://dx.doi.org/10.3390/ma13153414 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jia, Chaojun
Zhang, Qiang
Wang, Susheng
Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone
title Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone
title_full Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone
title_fullStr Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone
title_full_unstemmed Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone
title_short Experimental Investigation and Micromechanical Modeling of Elastoplastic Damage Behavior of Sandstone
title_sort experimental investigation and micromechanical modeling of elastoplastic damage behavior of sandstone
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7435461/
https://www.ncbi.nlm.nih.gov/pubmed/32756343
http://dx.doi.org/10.3390/ma13153414
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