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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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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. |
format | Online Article Text |
id | pubmed-10673829 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
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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