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...
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| 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. |
| doi_str_mv | 10.1371/journal.pone.0261355 |
| format | Article |
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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.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0261355</identifier><identifier>PMID: 34969048</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Architectural engineering ; Boundary conditions ; Caves ; Caving ; China ; Coal ; Coal Mining - instrumentation ; Coal Mining - methods ; Computer Simulation ; Contact force ; Coordinate transformations ; Ellipsoids ; Engineering ; Engineering and Technology ; Experiments ; Laboratories ; Management ; Mines ; Mining ; Models, Theoretical ; Morphology ; Normal Distribution ; Optimization ; Physical Sciences ; Process parameters ; Reproducibility of Results ; Research and Analysis Methods ; Simulation ; Velocity ; Work face</subject><ispartof>PloS one, 2021-12, Vol.16 (12), p.e0261355-e0261355</ispartof><rights>COPYRIGHT 2021 Public Library of Science</rights><rights>2021 Zhan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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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. 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhan, Qinjian</au><au>Shahani, Niaz Muhammad</au><au>Xue, Zhicheng</au><au>Li, Shengqiang</au><au>Makinde, Oluwole Daniel</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Law of coal caving behind the flexible shield support in pseudo-inclined working face</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2021-12-30</date><risdate>2021</risdate><volume>16</volume><issue>12</issue><spage>e0261355</spage><epage>e0261355</epage><pages>e0261355-e0261355</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>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.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>34969048</pmid><doi>10.1371/journal.pone.0261355</doi><tpages>e0261355</tpages><orcidid>https://orcid.org/0000-0001-6378-6782</orcidid><orcidid>https://orcid.org/0000-0002-3427-577X</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Architectural engineering Boundary conditions Caves Caving China Coal Coal Mining - instrumentation Coal Mining - methods Computer Simulation Contact force Coordinate transformations Ellipsoids Engineering Engineering and Technology Experiments Laboratories Management Mines Mining Models, Theoretical Morphology Normal Distribution Optimization Physical Sciences Process parameters Reproducibility of Results Research and Analysis Methods Simulation Velocity Work face |
| title | Law of coal caving behind the flexible shield support in pseudo-inclined working face |
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