Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation

Abstract Geo-materials may present varying mechanical properties under different stress paths, especially for tunnel excavation, which is typically characterized by the decreased radial stress and increased axial stress during the complex loading and unloading process. This study carried out a compa...

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Autores principales:	Yuzhou Xiang, Zhikai Zeng, Yangjun Xiang, Erdi Abi, Yingren Zheng, Hechuan Yuan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/17a36733790341c8b710d7c348fae20e
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spelling	oai:doaj.org-article:17a36733790341c8b710d7c348fae20e2021-12-02T17:08:43ZTunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation10.1038/s41598-021-96206-w2045-2322https://doaj.org/article/17a36733790341c8b710d7c348fae20e2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96206-whttps://doaj.org/toc/2045-2322Abstract Geo-materials may present varying mechanical properties under different stress paths, especially for tunnel excavation, which is typically characterized by the decreased radial stress and increased axial stress during the complex loading and unloading process. This study carried out a comparative analysis between the loading and unloading model testing, which was then combined with PFC2D simulation, aiming to reveal the fracture propagation pattern, microscopic stress and force chain distribution of the rock mass surrounding the tunnel. Comparisons of extents and development of tensile strain between loading and unloading testing results were made. The overall stability, the integrity of rock mass, and the failure pattern transition under loading and unloading processes were systematically examined. In addition, for the two unloading cases with different vertical stresses imposed, the failure patterns were both identified as the collapse of the V − shaped extruded sidewall, due to the coupling of the shear failure and the vertical tensile failure in the sidewall wedge.Yuzhou XiangZhikai ZengYangjun XiangErdi AbiYingren ZhengHechuan YuanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-20 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yuzhou Xiang Zhikai Zeng Yangjun Xiang Erdi Abi Yingren Zheng Hechuan Yuan Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation
description	Abstract Geo-materials may present varying mechanical properties under different stress paths, especially for tunnel excavation, which is typically characterized by the decreased radial stress and increased axial stress during the complex loading and unloading process. This study carried out a comparative analysis between the loading and unloading model testing, which was then combined with PFC2D simulation, aiming to reveal the fracture propagation pattern, microscopic stress and force chain distribution of the rock mass surrounding the tunnel. Comparisons of extents and development of tensile strain between loading and unloading testing results were made. The overall stability, the integrity of rock mass, and the failure pattern transition under loading and unloading processes were systematically examined. In addition, for the two unloading cases with different vertical stresses imposed, the failure patterns were both identified as the collapse of the V − shaped extruded sidewall, due to the coupling of the shear failure and the vertical tensile failure in the sidewall wedge.
format	article
author	Yuzhou Xiang Zhikai Zeng Yangjun Xiang Erdi Abi Yingren Zheng Hechuan Yuan
author_facet	Yuzhou Xiang Zhikai Zeng Yangjun Xiang Erdi Abi Yingren Zheng Hechuan Yuan
author_sort	Yuzhou Xiang
title	Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation
title_short	Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation
title_full	Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation
title_fullStr	Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation
title_full_unstemmed	Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation
title_sort	tunnel failure mechanism during loading and unloading processes through physical model testing and dem simulation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/17a36733790341c8b710d7c348fae20e
work_keys_str_mv	AT yuzhouxiang tunnelfailuremechanismduringloadingandunloadingprocessesthroughphysicalmodeltestinganddemsimulation AT zhikaizeng tunnelfailuremechanismduringloadingandunloadingprocessesthroughphysicalmodeltestinganddemsimulation AT yangjunxiang tunnelfailuremechanismduringloadingandunloadingprocessesthroughphysicalmodeltestinganddemsimulation AT erdiabi tunnelfailuremechanismduringloadingandunloadingprocessesthroughphysicalmodeltestinganddemsimulation AT yingrenzheng tunnelfailuremechanismduringloadingandunloadingprocessesthroughphysicalmodeltestinganddemsimulation AT hechuanyuan tunnelfailuremechanismduringloadingandunloadingprocessesthroughphysicalmodeltestinganddemsimulation
_version_	1718381484287459328

Tunnel failure mechanism during loading and unloading processes through physical model testing and DEM simulation

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