Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.

Proper mechanical model selection is critical in tunnel support design and stability analysis, especially to reflect the creep and strain-softening behavior of soft rock. We present a coupled nonlinear Burgers strain-softening (NBSS) model and numerical calculation method to investigate the coupled...

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Autores principales:	Jianjun Zhang, Baicong Yao, Yunhe Ao, Chunzhe Jin, Chuang Sun
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e92045ae59044cf9a2a5e7708d54d556
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spelling	oai:doaj.org-article:e92045ae59044cf9a2a5e7708d54d5562021-12-02T20:17:34ZAnalysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.1932-620310.1371/journal.pone.0256243https://doaj.org/article/e92045ae59044cf9a2a5e7708d54d5562021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0256243https://doaj.org/toc/1932-6203Proper mechanical model selection is critical in tunnel support design and stability analysis, especially to reflect the creep and strain-softening behavior of soft rock. We present a coupled nonlinear Burgers strain-softening (NBSS) model and numerical calculation method to investigate the coupled effects of creep and strain-softening of soft rock tunnels. The nonlinear elastic-viscous model is used to simulate the steady creep behavior of mudstone, and the nonlinear viscoplastic strain-softening model is used to simulate the accelerated creep behavior and post-peak strength attenuation behavior. The experimental results show that the viscoplastic parameters and post-peak softening parameters of mudstone are highly sensitive to confining pressure and exhibit nonlinear characteristics. The accelerated creep curve obtained by the numerical calculation is consistent with the experiments, which verifies the model reliability. We use the NBSS and nonlinear Burgers Mohr-Coulomb (NBMC) models to calculate the plastic zone distribution characteristics and deformation law. The distribution of the plastic zone calculated by the NBSS model is larger with more localized fractures. The NBSS model is useful for studying the evolution of stress and displacement fields of complex surrounding rock mass, which provides important theoretical guidelines for the support design and stability analysis of soft rock tunnel engineering.Jianjun ZhangBaicong YaoYunhe AoChunzhe JinChuang SunPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 8, p e0256243 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jianjun Zhang Baicong Yao Yunhe Ao Chunzhe Jin Chuang Sun Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.
description	Proper mechanical model selection is critical in tunnel support design and stability analysis, especially to reflect the creep and strain-softening behavior of soft rock. We present a coupled nonlinear Burgers strain-softening (NBSS) model and numerical calculation method to investigate the coupled effects of creep and strain-softening of soft rock tunnels. The nonlinear elastic-viscous model is used to simulate the steady creep behavior of mudstone, and the nonlinear viscoplastic strain-softening model is used to simulate the accelerated creep behavior and post-peak strength attenuation behavior. The experimental results show that the viscoplastic parameters and post-peak softening parameters of mudstone are highly sensitive to confining pressure and exhibit nonlinear characteristics. The accelerated creep curve obtained by the numerical calculation is consistent with the experiments, which verifies the model reliability. We use the NBSS and nonlinear Burgers Mohr-Coulomb (NBMC) models to calculate the plastic zone distribution characteristics and deformation law. The distribution of the plastic zone calculated by the NBSS model is larger with more localized fractures. The NBSS model is useful for studying the evolution of stress and displacement fields of complex surrounding rock mass, which provides important theoretical guidelines for the support design and stability analysis of soft rock tunnel engineering.
format	article
author	Jianjun Zhang Baicong Yao Yunhe Ao Chunzhe Jin Chuang Sun
author_facet	Jianjun Zhang Baicong Yao Yunhe Ao Chunzhe Jin Chuang Sun
author_sort	Jianjun Zhang
title	Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.
title_short	Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.
title_full	Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.
title_fullStr	Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.
title_full_unstemmed	Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.
title_sort	analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/e92045ae59044cf9a2a5e7708d54d556
work_keys_str_mv	AT jianjunzhang analysisandnumericalcalculationofacoupledcreepandstrainsofteningmodelforsoftrocktunnels AT baicongyao analysisandnumericalcalculationofacoupledcreepandstrainsofteningmodelforsoftrocktunnels AT yunheao analysisandnumericalcalculationofacoupledcreepandstrainsofteningmodelforsoftrocktunnels AT chunzhejin analysisandnumericalcalculationofacoupledcreepandstrainsofteningmodelforsoftrocktunnels AT chuangsun analysisandnumericalcalculationofacoupledcreepandstrainsofteningmodelforsoftrocktunnels
_version_	1718374380053987328

Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels.

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