Cargando…

Field study on the improvement of coal gangue filling using dynamic compaction

In this study, dynamic compaction method was used to treat the gangue hill of the Xinglongzhuang coal mine in China, and the deep compaction of deep coal gangue was examined. The crushing characteristics and improving depth of coal gangue filling under different dynamic compaction conditions were de...

Descripción completa

Detalles Bibliográficos
Autores principales: Zhang, Qingfeng, Wang, Dongquan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8099061/
https://www.ncbi.nlm.nih.gov/pubmed/33951091
http://dx.doi.org/10.1371/journal.pone.0250961
_version_ 1783688525442449408
author Zhang, Qingfeng
Wang, Dongquan
author_facet Zhang, Qingfeng
Wang, Dongquan
author_sort Zhang, Qingfeng
collection PubMed
description In this study, dynamic compaction method was used to treat the gangue hill of the Xinglongzhuang coal mine in China, and the deep compaction of deep coal gangue was examined. The crushing characteristics and improving depth of coal gangue filling under different dynamic compaction conditions were determined. Dynamic compaction tests with different tamping energy were performed to improve the coal gangue filling. In addition, dynamic penetration tests and the foundation bearing capacity were conducted. The relationship between the tamping energy and improvement was investigated, and the optimum tamping energy, number of tamping blows, improving depth, and other dynamic compaction parameters and filling bearing characteristics were obtained. The field test results show that with increasing number of tamping blows, compaction induced deformation gradually decreased and begins to stabilize, while the optimum number of tamping blows increases with increasing ramming energy. The optimum number of tamping blows is in the range 9–11, and the effective coal gangue improving depth is in the range 6–8m, when the tamping energy is greater than 3000 kN.m. The gradation improved, and the weight percentage of the particles smaller than 4.75 mm was larger than 50%, resulting in better physical and mechanical behavior of the coal gangue filling. The coal gangue filling bearing capacity and anti-deformation ability increase with increasing tamping energy. The coal gangue filling bearing capacity reached at least 350 kPa after being improved by dynamic compaction with a tamping energy greater than 3000kN.m.
format Online
Article
Text
id pubmed-8099061
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-80990612021-05-17 Field study on the improvement of coal gangue filling using dynamic compaction Zhang, Qingfeng Wang, Dongquan PLoS One Research Article In this study, dynamic compaction method was used to treat the gangue hill of the Xinglongzhuang coal mine in China, and the deep compaction of deep coal gangue was examined. The crushing characteristics and improving depth of coal gangue filling under different dynamic compaction conditions were determined. Dynamic compaction tests with different tamping energy were performed to improve the coal gangue filling. In addition, dynamic penetration tests and the foundation bearing capacity were conducted. The relationship between the tamping energy and improvement was investigated, and the optimum tamping energy, number of tamping blows, improving depth, and other dynamic compaction parameters and filling bearing characteristics were obtained. The field test results show that with increasing number of tamping blows, compaction induced deformation gradually decreased and begins to stabilize, while the optimum number of tamping blows increases with increasing ramming energy. The optimum number of tamping blows is in the range 9–11, and the effective coal gangue improving depth is in the range 6–8m, when the tamping energy is greater than 3000 kN.m. The gradation improved, and the weight percentage of the particles smaller than 4.75 mm was larger than 50%, resulting in better physical and mechanical behavior of the coal gangue filling. The coal gangue filling bearing capacity and anti-deformation ability increase with increasing tamping energy. The coal gangue filling bearing capacity reached at least 350 kPa after being improved by dynamic compaction with a tamping energy greater than 3000kN.m. Public Library of Science 2021-05-05 /pmc/articles/PMC8099061/ /pubmed/33951091 http://dx.doi.org/10.1371/journal.pone.0250961 Text en © 2021 Zhang, Wang 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
Zhang, Qingfeng
Wang, Dongquan
Field study on the improvement of coal gangue filling using dynamic compaction
title Field study on the improvement of coal gangue filling using dynamic compaction
title_full Field study on the improvement of coal gangue filling using dynamic compaction
title_fullStr Field study on the improvement of coal gangue filling using dynamic compaction
title_full_unstemmed Field study on the improvement of coal gangue filling using dynamic compaction
title_short Field study on the improvement of coal gangue filling using dynamic compaction
title_sort field study on the improvement of coal gangue filling using dynamic compaction
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8099061/
https://www.ncbi.nlm.nih.gov/pubmed/33951091
http://dx.doi.org/10.1371/journal.pone.0250961
work_keys_str_mv AT zhangqingfeng fieldstudyontheimprovementofcoalganguefillingusingdynamiccompaction
AT wangdongquan fieldstudyontheimprovementofcoalganguefillingusingdynamiccompaction