Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis

We aim to understand the relaxation of columnar joint rock masses during the excavation process of the diversion tunnel of the Baihetan hydropower station. This paper inverts the deformation parameters of the relaxed columnar joint rock based on the displacement monitoring data, and introduces a rel...

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Autores principales:	Jun Yu, Qiang Zhang, Weiya Xu, Rubin Wang, Han Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	the unloading relaxation anisotropy relaxation factor equivalent strain columnar jointed rock mass Science Q
Acceso en línea:	https://doaj.org/article/559b88b1d2a94abda3436fb4be5f8460
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id	oai:doaj.org-article:559b88b1d2a94abda3436fb4be5f8460
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spelling	oai:doaj.org-article:559b88b1d2a94abda3436fb4be5f84602021-11-08T12:11:43ZStudy on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis2296-646310.3389/feart.2021.779537https://doaj.org/article/559b88b1d2a94abda3436fb4be5f84602021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.779537/fullhttps://doaj.org/toc/2296-6463We aim to understand the relaxation of columnar joint rock masses during the excavation process of the diversion tunnel of the Baihetan hydropower station. This paper inverts the deformation parameters of the relaxed columnar joint rock based on the displacement monitoring data, and introduces a relaxation factor to describe the deterioration degree of anisotropic parameters of the relaxed columnar jointed rock. The equivalent strain is proposed as the criterion of unloading relaxation and the threshold is also given. Based on the software Flac3d, a program for calculating anisotropic elastoplastic model is developed. The distribution of the relaxation zone of the diversion tunnel after excavation is simulated, and compared with the results of the acoustic detection to verify the correctness and rationality of the program, which can provide a necessary reference for the design and construction of hydropower projects.Jun YuQiang ZhangWeiya XuRubin WangHan ZhangFrontiers Media S.A.articlethe unloading relaxationanisotropyrelaxation factorequivalent straincolumnar jointed rock massScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	the unloading relaxation anisotropy relaxation factor equivalent strain columnar jointed rock mass Science Q
spellingShingle	the unloading relaxation anisotropy relaxation factor equivalent strain columnar jointed rock mass Science Q Jun Yu Qiang Zhang Weiya Xu Rubin Wang Han Zhang Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis
description	We aim to understand the relaxation of columnar joint rock masses during the excavation process of the diversion tunnel of the Baihetan hydropower station. This paper inverts the deformation parameters of the relaxed columnar joint rock based on the displacement monitoring data, and introduces a relaxation factor to describe the deterioration degree of anisotropic parameters of the relaxed columnar jointed rock. The equivalent strain is proposed as the criterion of unloading relaxation and the threshold is also given. Based on the software Flac3d, a program for calculating anisotropic elastoplastic model is developed. The distribution of the relaxation zone of the diversion tunnel after excavation is simulated, and compared with the results of the acoustic detection to verify the correctness and rationality of the program, which can provide a necessary reference for the design and construction of hydropower projects.
format	article
author	Jun Yu Qiang Zhang Weiya Xu Rubin Wang Han Zhang
author_facet	Jun Yu Qiang Zhang Weiya Xu Rubin Wang Han Zhang
author_sort	Jun Yu
title	Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis
title_short	Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis
title_full	Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis
title_fullStr	Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis
title_full_unstemmed	Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis
title_sort	study on unloading relaxation characteristics of columnar jointed rock masses based on displacement back analysis
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/559b88b1d2a94abda3436fb4be5f8460
work_keys_str_mv	AT junyu studyonunloadingrelaxationcharacteristicsofcolumnarjointedrockmassesbasedondisplacementbackanalysis AT qiangzhang studyonunloadingrelaxationcharacteristicsofcolumnarjointedrockmassesbasedondisplacementbackanalysis AT weiyaxu studyonunloadingrelaxationcharacteristicsofcolumnarjointedrockmassesbasedondisplacementbackanalysis AT rubinwang studyonunloadingrelaxationcharacteristicsofcolumnarjointedrockmassesbasedondisplacementbackanalysis AT hanzhang studyonunloadingrelaxationcharacteristicsofcolumnarjointedrockmassesbasedondisplacementbackanalysis
_version_	1718442237198598144

Study on Unloading Relaxation Characteristics of Columnar Jointed Rock Masses Based on Displacement Back Analysis

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