Gas migration control in goaf with double roof cutting and retaining roadway
Abstract The behavior of gas migration in goaf under double roof cutting conditions directly influences the effectiveness of gas control measures. This study employs a combination of numerical simulation and field verification to investigate the patterns of gas migration and accumulation in goaf and...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-11-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-81256-7 |
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| author | Xiaobo Lv Shengyong Hu Jun Nian Chunsheng Deng Bo Zhao Cheng He Yansheng Wang Xitu Zhang Wei Zhang |
| author_facet | Xiaobo Lv Shengyong Hu Jun Nian Chunsheng Deng Bo Zhao Cheng He Yansheng Wang Xitu Zhang Wei Zhang |
| author_sort | Xiaobo Lv |
| collection | DOAJ |
| description | Abstract The behavior of gas migration in goaf under double roof cutting conditions directly influences the effectiveness of gas control measures. This study employs a combination of numerical simulation and field verification to investigate the patterns of gas migration and accumulation in goaf and to develop coordinated gas control methods under the conditions of double roof cutting and retained roadway. The results indicate that with double roof cutting, goaf permeability generally increases from the interior towards the exterior, with significantly higher porosity in the separation range compared to other areas. High permeability channels form along the sides of the open-off cut, the working face, and the two roadways, subsequently becoming areas of gas accumulation. High-level directional long borehole drainage achieves the best gas drainage at the bottom of the goaf on the working face and belt roadway sides, reducing gas concentration in the working face space to below 0.5%. Pipe jacking extraction along the retained roadway effectively reduces gas concentrations on the working face side and both roadway sides, maintaining working face gas concentrations consistently below 0.3%. Supplementary cutting hole drilling and extraction post-goaf formation show optimal gas extraction results on the working face side and near the two roadways, with gas concentration in the upper corner and return airflow remaining below 0.3% and trending downward. Field data validate the numerical simulation experiment theory. |
| format | Article |
| id | doaj-art-3406ec9e1959492b8d2ec2cefb43223c |
| institution | DOAJ |
| issn | 2045-2322 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-3406ec9e1959492b8d2ec2cefb43223c2025-08-20T02:49:09ZengNature PortfolioScientific Reports2045-23222024-11-0114112010.1038/s41598-024-81256-7Gas migration control in goaf with double roof cutting and retaining roadwayXiaobo Lv0Shengyong Hu1Jun Nian2Chunsheng Deng3Bo Zhao4Cheng He5Yansheng Wang6Xitu Zhang7Wei Zhang8School of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologySchool of Safety and Emergency Management Engineering, Taiyuan University of TechnologyAbstract The behavior of gas migration in goaf under double roof cutting conditions directly influences the effectiveness of gas control measures. This study employs a combination of numerical simulation and field verification to investigate the patterns of gas migration and accumulation in goaf and to develop coordinated gas control methods under the conditions of double roof cutting and retained roadway. The results indicate that with double roof cutting, goaf permeability generally increases from the interior towards the exterior, with significantly higher porosity in the separation range compared to other areas. High permeability channels form along the sides of the open-off cut, the working face, and the two roadways, subsequently becoming areas of gas accumulation. High-level directional long borehole drainage achieves the best gas drainage at the bottom of the goaf on the working face and belt roadway sides, reducing gas concentration in the working face space to below 0.5%. Pipe jacking extraction along the retained roadway effectively reduces gas concentrations on the working face side and both roadway sides, maintaining working face gas concentrations consistently below 0.3%. Supplementary cutting hole drilling and extraction post-goaf formation show optimal gas extraction results on the working face side and near the two roadways, with gas concentration in the upper corner and return airflow remaining below 0.3% and trending downward. Field data validate the numerical simulation experiment theory.https://doi.org/10.1038/s41598-024-81256-7Double roof cuttingGoafGas migrationControl methodPermeability |
| spellingShingle | Xiaobo Lv Shengyong Hu Jun Nian Chunsheng Deng Bo Zhao Cheng He Yansheng Wang Xitu Zhang Wei Zhang Gas migration control in goaf with double roof cutting and retaining roadway Scientific Reports Double roof cutting Goaf Gas migration Control method Permeability |
| title | Gas migration control in goaf with double roof cutting and retaining roadway |
| title_full | Gas migration control in goaf with double roof cutting and retaining roadway |
| title_fullStr | Gas migration control in goaf with double roof cutting and retaining roadway |
| title_full_unstemmed | Gas migration control in goaf with double roof cutting and retaining roadway |
| title_short | Gas migration control in goaf with double roof cutting and retaining roadway |
| title_sort | gas migration control in goaf with double roof cutting and retaining roadway |
| topic | Double roof cutting Goaf Gas migration Control method Permeability |
| url | https://doi.org/10.1038/s41598-024-81256-7 |
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