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Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application

At present, the many domestic, large mined-out areas caused by single filling ability of the slurry flow state, thin layer flow and hardening after filling in multilayer structure generally need to finish filling for many times, because after a filling experience shows that filling body in the last...

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Autores principales: Jiao, Huazhe, Yang, Wenbo, Shen, Huiming, Yang, Yingjie, Liu, Juanhong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414315/
https://www.ncbi.nlm.nih.gov/pubmed/36013819
http://dx.doi.org/10.3390/ma15165680
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author Jiao, Huazhe
Yang, Wenbo
Shen, Huiming
Yang, Yingjie
Liu, Juanhong
author_facet Jiao, Huazhe
Yang, Wenbo
Shen, Huiming
Yang, Yingjie
Liu, Juanhong
author_sort Jiao, Huazhe
collection PubMed
description At present, the many domestic, large mined-out areas caused by single filling ability of the slurry flow state, thin layer flow and hardening after filling in multilayer structure generally need to finish filling for many times, because after a filling experience shows that filling body in the last solidification of flow, this leads to a lower one side of the roof, and far distance part of the filling body cannot pick up top. The determination of backfill strength is the key problem of the cemented backfill method, and it is affected by many factors. Therefore, through theoretical calculation, laboratory testing and numerical simulation methods, combined with the field filling process, this paper has verified the flow accumulation and stratification characteristics of stope layered filling slurry. When the slurry concentration is 60–73%, the slope increases exponentially from 2.5° to 8°. It is revealed that the delamination and meshing state are the key factors to determine the overall strength of large-scale stope filling through the testing of particle size distribution in interlayer and flow direction. The reduction effect of the number and Angle of structural weak surface formed by layering and filling on strength is revealed: cement–sand ratio 1:12, concentration 68%, standard curing R28 > 1.81 MPa. The strength reduction coefficient is 61.31% and 92.96% when the number of layers is 1–4. The higher the number of layers, the greater is the reduction coefficient, and when the stratification angle increases by 2, the strength of backfill decreases by 20–30%. The verification of stope filling coring shows that the in situ strength reaches 2.42 MPa, which is 0.61 MPa higher than the standard curing strength, with an increase of 33.7%. When the depth is from 1 m to 5 m, the strength increases from 2.26 MPa to 2.69 MPa, with an increase rate of 18.2%. Finally, through the research and application of the comprehensive technology of mining and filling coordination under the complex goaf group, the residual ore resources of Xianglushan tungsten mine are effectively recovered, the volume of goaf is significantly reduced, and the safety of goaf is improved.
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spelling pubmed-94143152022-08-27 Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application Jiao, Huazhe Yang, Wenbo Shen, Huiming Yang, Yingjie Liu, Juanhong Materials (Basel) Article At present, the many domestic, large mined-out areas caused by single filling ability of the slurry flow state, thin layer flow and hardening after filling in multilayer structure generally need to finish filling for many times, because after a filling experience shows that filling body in the last solidification of flow, this leads to a lower one side of the roof, and far distance part of the filling body cannot pick up top. The determination of backfill strength is the key problem of the cemented backfill method, and it is affected by many factors. Therefore, through theoretical calculation, laboratory testing and numerical simulation methods, combined with the field filling process, this paper has verified the flow accumulation and stratification characteristics of stope layered filling slurry. When the slurry concentration is 60–73%, the slope increases exponentially from 2.5° to 8°. It is revealed that the delamination and meshing state are the key factors to determine the overall strength of large-scale stope filling through the testing of particle size distribution in interlayer and flow direction. The reduction effect of the number and Angle of structural weak surface formed by layering and filling on strength is revealed: cement–sand ratio 1:12, concentration 68%, standard curing R28 > 1.81 MPa. The strength reduction coefficient is 61.31% and 92.96% when the number of layers is 1–4. The higher the number of layers, the greater is the reduction coefficient, and when the stratification angle increases by 2, the strength of backfill decreases by 20–30%. The verification of stope filling coring shows that the in situ strength reaches 2.42 MPa, which is 0.61 MPa higher than the standard curing strength, with an increase of 33.7%. When the depth is from 1 m to 5 m, the strength increases from 2.26 MPa to 2.69 MPa, with an increase rate of 18.2%. Finally, through the research and application of the comprehensive technology of mining and filling coordination under the complex goaf group, the residual ore resources of Xianglushan tungsten mine are effectively recovered, the volume of goaf is significantly reduced, and the safety of goaf is improved. MDPI 2022-08-18 /pmc/articles/PMC9414315/ /pubmed/36013819 http://dx.doi.org/10.3390/ma15165680 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jiao, Huazhe
Yang, Wenbo
Shen, Huiming
Yang, Yingjie
Liu, Juanhong
Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application
title Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application
title_full Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application
title_fullStr Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application
title_full_unstemmed Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application
title_short Study on Multi-Layer Filling Treatment of Extra-Large Goaf and Its Underground Application
title_sort study on multi-layer filling treatment of extra-large goaf and its underground application
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414315/
https://www.ncbi.nlm.nih.gov/pubmed/36013819
http://dx.doi.org/10.3390/ma15165680
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