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Law of coal caving behind the flexible shield support in pseudo-inclined working face
Complex boundary conditions are the major influencing factors of coal caving law in the pseudo-inclined working face. The main purpose of this study is to analyze coal caving law of flexible shield support and then to establish the internal relations among coal caving parameters under complex bounda...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8717996/ https://www.ncbi.nlm.nih.gov/pubmed/34969048 http://dx.doi.org/10.1371/journal.pone.0261355 |
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author | Zhan, Qinjian Shahani, Niaz Muhammad Xue, Zhicheng Li, Shengqiang |
author_facet | Zhan, Qinjian Shahani, Niaz Muhammad Xue, Zhicheng Li, Shengqiang |
author_sort | Zhan, Qinjian |
collection | PubMed |
description | Complex boundary conditions are the major influencing factors of coal caving law in the pseudo-inclined working face. The main purpose of this study is to analyze coal caving law of flexible shield support and then to establish the internal relations among coal caving parameters under complex boundary conditions. Firstly, the law of coal caving in different falling modes is simulated physically. Secondly, the coal caving shape, displacement field, and contact force field is simulated. Then, coal caving law and process parameters is analyzed theoretically. Finally, the test was performed in Bai-Ji Mine. The research shows that ellipsoidal ore drawing theory has universal applicability in coal drawing law analysis and parameter optimization. After the Isolated Extraction Zone and Isolated Movement Zone reach the roof, the expansion speed is marked by a short delay, and then, while expanding to the floor, two butted incomplete ellipsoids are formed. There is a time-space difference in coal caving after the support, and some coal will be mined in the next round of coal caving. There are obvious differences in the coal loosening range, displacement field, and contact force field on both sides of the long axis. When the support falls along with the bottom plate, it is more conducive to the release of coal. The test shows that the research is of great significance for optimizing the caving parameters of flexible shield support in the pseudo-inclined working face of the steep seam. |
format | Online Article Text |
id | pubmed-8717996 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-87179962021-12-31 Law of coal caving behind the flexible shield support in pseudo-inclined working face Zhan, Qinjian Shahani, Niaz Muhammad Xue, Zhicheng Li, Shengqiang PLoS One Research Article Complex boundary conditions are the major influencing factors of coal caving law in the pseudo-inclined working face. The main purpose of this study is to analyze coal caving law of flexible shield support and then to establish the internal relations among coal caving parameters under complex boundary conditions. Firstly, the law of coal caving in different falling modes is simulated physically. Secondly, the coal caving shape, displacement field, and contact force field is simulated. Then, coal caving law and process parameters is analyzed theoretically. Finally, the test was performed in Bai-Ji Mine. The research shows that ellipsoidal ore drawing theory has universal applicability in coal drawing law analysis and parameter optimization. After the Isolated Extraction Zone and Isolated Movement Zone reach the roof, the expansion speed is marked by a short delay, and then, while expanding to the floor, two butted incomplete ellipsoids are formed. There is a time-space difference in coal caving after the support, and some coal will be mined in the next round of coal caving. There are obvious differences in the coal loosening range, displacement field, and contact force field on both sides of the long axis. When the support falls along with the bottom plate, it is more conducive to the release of coal. The test shows that the research is of great significance for optimizing the caving parameters of flexible shield support in the pseudo-inclined working face of the steep seam. Public Library of Science 2021-12-30 /pmc/articles/PMC8717996/ /pubmed/34969048 http://dx.doi.org/10.1371/journal.pone.0261355 Text en © 2021 Zhan et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Zhan, Qinjian Shahani, Niaz Muhammad Xue, Zhicheng Li, Shengqiang Law of coal caving behind the flexible shield support in pseudo-inclined working face |
title | Law of coal caving behind the flexible shield support in pseudo-inclined working face |
title_full | Law of coal caving behind the flexible shield support in pseudo-inclined working face |
title_fullStr | Law of coal caving behind the flexible shield support in pseudo-inclined working face |
title_full_unstemmed | Law of coal caving behind the flexible shield support in pseudo-inclined working face |
title_short | Law of coal caving behind the flexible shield support in pseudo-inclined working face |
title_sort | law of coal caving behind the flexible shield support in pseudo-inclined working face |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8717996/ https://www.ncbi.nlm.nih.gov/pubmed/34969048 http://dx.doi.org/10.1371/journal.pone.0261355 |
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