Mechanism and control of floor heave in two entry retained roadways using dense boreholes
Abstract This study addresses severe floor heave in retained entries of two-entry longwall faces through a case analysis of Chahasu Coal Mine, China. Surrounding rock deformation and failure in the 31,317 tail entry were characterized through field monitoring and laboratory tests, followed by analys...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-05-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-02066-z |
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| author | Qiang Xu Xue-hua Li Ze Xia Chuang-kai Zheng Ying-hu Li Gang Huang |
| author_facet | Qiang Xu Xue-hua Li Ze Xia Chuang-kai Zheng Ying-hu Li Gang Huang |
| author_sort | Qiang Xu |
| collection | DOAJ |
| description | Abstract This study addresses severe floor heave in retained entries of two-entry longwall faces through a case analysis of Chahasu Coal Mine, China. Surrounding rock deformation and failure in the 31,317 tail entry were characterized through field monitoring and laboratory tests, followed by analysis of geological and mining impacts on floor heave. Stress evolution in the coal pillar between entries during mining was examined through 3DEC numerical simulations, revealing floor heave mechanisms. Support strengthening and stress improvement measures were comparatively evaluated. A dense borehole roof-cutting technology (CRDBDCS) was developed for floor heave control, with key borehole parameters optimized. When implemented in the 31,315 head entry and adjacent roadways, an over 87% reduction in floor heave volume was achieved, enabling entry reuse. The effectiveness of CRDBDCS was thereby demonstrated, providing technical support for the safe and efficient operation of coal mine roadways. |
| format | Article |
| id | doaj-art-ae0e7ae691c140fc84c96c7f38f03ff9 |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-ae0e7ae691c140fc84c96c7f38f03ff92025-08-20T02:32:04ZengNature PortfolioScientific Reports2045-23222025-05-0115111810.1038/s41598-025-02066-zMechanism and control of floor heave in two entry retained roadways using dense boreholesQiang Xu0Xue-hua Li1Ze Xia2Chuang-kai Zheng3Ying-hu Li4Gang Huang5School of Mines, China University of Mining and TechnologySchool of Mines, China University of Mining and TechnologySchool of Mines, China University of Mining and TechnologySchool of Mines, China University of Mining and TechnologySchool of Mines, China University of Mining and TechnologySchool of Mines, China University of Mining and TechnologyAbstract This study addresses severe floor heave in retained entries of two-entry longwall faces through a case analysis of Chahasu Coal Mine, China. Surrounding rock deformation and failure in the 31,317 tail entry were characterized through field monitoring and laboratory tests, followed by analysis of geological and mining impacts on floor heave. Stress evolution in the coal pillar between entries during mining was examined through 3DEC numerical simulations, revealing floor heave mechanisms. Support strengthening and stress improvement measures were comparatively evaluated. A dense borehole roof-cutting technology (CRDBDCS) was developed for floor heave control, with key borehole parameters optimized. When implemented in the 31,315 head entry and adjacent roadways, an over 87% reduction in floor heave volume was achieved, enabling entry reuse. The effectiveness of CRDBDCS was thereby demonstrated, providing technical support for the safe and efficient operation of coal mine roadways.https://doi.org/10.1038/s41598-025-02066-zTwo-entry Longwall faceRetained entryFloor heaveMining‑induced stressDense boreholesConcentrated stress dredging |
| spellingShingle | Qiang Xu Xue-hua Li Ze Xia Chuang-kai Zheng Ying-hu Li Gang Huang Mechanism and control of floor heave in two entry retained roadways using dense boreholes Scientific Reports Two-entry Longwall face Retained entry Floor heave Mining‑induced stress Dense boreholes Concentrated stress dredging |
| title | Mechanism and control of floor heave in two entry retained roadways using dense boreholes |
| title_full | Mechanism and control of floor heave in two entry retained roadways using dense boreholes |
| title_fullStr | Mechanism and control of floor heave in two entry retained roadways using dense boreholes |
| title_full_unstemmed | Mechanism and control of floor heave in two entry retained roadways using dense boreholes |
| title_short | Mechanism and control of floor heave in two entry retained roadways using dense boreholes |
| title_sort | mechanism and control of floor heave in two entry retained roadways using dense boreholes |
| topic | Two-entry Longwall face Retained entry Floor heave Mining‑induced stress Dense boreholes Concentrated stress dredging |
| url | https://doi.org/10.1038/s41598-025-02066-z |
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