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Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology

Aiming at the engineering problem of roadway deformation and instability of swelling soft rock widely existed in Kailuan mining area, the mineral composition and microstructure of such soft rock were obtained by conducting scanning electron microscopy, X-ray diffraction experiments, uniaxial and con...

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Autores principales: Yang, Tuo, Liu, Jianzhuang, Luo, Jianqiao, Shen, Yupeng, Fu, Peng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10673829/
https://www.ncbi.nlm.nih.gov/pubmed/38001131
http://dx.doi.org/10.1038/s41598-023-47451-8
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author Yang, Tuo
Liu, Jianzhuang
Luo, Jianqiao
Shen, Yupeng
Fu, Peng
author_facet Yang, Tuo
Liu, Jianzhuang
Luo, Jianqiao
Shen, Yupeng
Fu, Peng
author_sort Yang, Tuo
collection PubMed
description Aiming at the engineering problem of roadway deformation and instability of swelling soft rock widely existed in Kailuan mining area, the mineral composition and microstructure of such soft rock were obtained by conducting scanning electron microscopy, X-ray diffraction experiments, uniaxial and conventional triaxial tests, and the law of softening and expanding of such soft rock and the failure mechanism of surrounding rock were identified. The combined support scheme of multi-level anchor bolt, bottom corner pressure relief and fractional grouting is proposed. The roadway supporting parameters are adjusted and optimized by FLAC3D numerical simulation, and three supporting methods of multi-layer anchor bolt, bottom corner pressure relief and fractional grouting are determined and their parameters are optimized. The study results show that: the total amount of clay minerals is 53–75%, pores, fissures, nanoscale and micron layer gaps are developed, providing a penetrating channel for water infiltration to soften the surrounding rock; the three-level anchor pressure-relief and grouting support technology can control the sinking amount of the roof within 170 mm, the bottom drum amount within 210 mm, the bolts of each level is evenly distributed in tension, and the maximum stress and bottom drum displacement in the pressure relief area are significantly reduced; the pressure-relief groove promotes the development of bottom corner cracks, accelerates the secondary distribution of peripheral stress, and weakens the effect of high stress on the shallow area. Using time or displacement as the index, optimizing the grouting time, filling the primary and excavation cracks, blocking the expansion and softening effect of water on the rock mass, realizing the dynamic unity of structural yielding pressure and surrounding rock modification, has guiding significance for the support control of soft rock roadway.
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spelling pubmed-106738292023-11-24 Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology Yang, Tuo Liu, Jianzhuang Luo, Jianqiao Shen, Yupeng Fu, Peng Sci Rep Article Aiming at the engineering problem of roadway deformation and instability of swelling soft rock widely existed in Kailuan mining area, the mineral composition and microstructure of such soft rock were obtained by conducting scanning electron microscopy, X-ray diffraction experiments, uniaxial and conventional triaxial tests, and the law of softening and expanding of such soft rock and the failure mechanism of surrounding rock were identified. The combined support scheme of multi-level anchor bolt, bottom corner pressure relief and fractional grouting is proposed. The roadway supporting parameters are adjusted and optimized by FLAC3D numerical simulation, and three supporting methods of multi-layer anchor bolt, bottom corner pressure relief and fractional grouting are determined and their parameters are optimized. The study results show that: the total amount of clay minerals is 53–75%, pores, fissures, nanoscale and micron layer gaps are developed, providing a penetrating channel for water infiltration to soften the surrounding rock; the three-level anchor pressure-relief and grouting support technology can control the sinking amount of the roof within 170 mm, the bottom drum amount within 210 mm, the bolts of each level is evenly distributed in tension, and the maximum stress and bottom drum displacement in the pressure relief area are significantly reduced; the pressure-relief groove promotes the development of bottom corner cracks, accelerates the secondary distribution of peripheral stress, and weakens the effect of high stress on the shallow area. Using time or displacement as the index, optimizing the grouting time, filling the primary and excavation cracks, blocking the expansion and softening effect of water on the rock mass, realizing the dynamic unity of structural yielding pressure and surrounding rock modification, has guiding significance for the support control of soft rock roadway. Nature Publishing Group UK 2023-11-24 /pmc/articles/PMC10673829/ /pubmed/38001131 http://dx.doi.org/10.1038/s41598-023-47451-8 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Yang, Tuo
Liu, Jianzhuang
Luo, Jianqiao
Shen, Yupeng
Fu, Peng
Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology
title Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology
title_full Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology
title_fullStr Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology
title_full_unstemmed Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology
title_short Study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology
title_sort study on instability mechanism of soft rock roadway and pressure-relief bolt-grouting support technology
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10673829/
https://www.ncbi.nlm.nih.gov/pubmed/38001131
http://dx.doi.org/10.1038/s41598-023-47451-8
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