Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seams
AbstractThe traditional index to determine the width of the stopping coal pillar (WSCP) is generally only the front abutment pressure, but the direction of the principal stress will deflect due to the mining action, which brings significant challenges to controlling the surrounding rock. Based on th...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2023-12-01
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| Series: | Geomatics, Natural Hazards & Risk |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/19475705.2023.2227327 |
| _version_ | 1797389246131077120 |
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| author | Wenli Zhai Fulian He Liang Li Jiayu Song Xuhui Xu Kai Lv Deqiu Wang Qing Ma |
| author_facet | Wenli Zhai Fulian He Liang Li Jiayu Song Xuhui Xu Kai Lv Deqiu Wang Qing Ma |
| author_sort | Wenli Zhai |
| collection | DOAJ |
| description | AbstractThe traditional index to determine the width of the stopping coal pillar (WSCP) is generally only the front abutment pressure, but the direction of the principal stress will deflect due to the mining action, which brings significant challenges to controlling the surrounding rock. Based on theoretical calculation and numerical simulation, we studied the deflection law of principal stress under mining action, quantified the bearing capacity of roadway surrounding rock, and determined WSCP. The results show that: (1) With the deflection of the principal stress, the distribution of the surrounding rock plastic zone also rotates; (2) [Formula: see text] and repeated mining dominate and aggravate the deflection angle and range of the principal stress in front of the working face, respectively. When [Formula: see text] is close to 1, the deflection of principal stress should be paid attention to in determining WSCP; (3) The anchorage composite bearing structure (ACBS) provides a scientific basis for quantifying the bearing capacity of surrounding rock. WSCP of the lower coal seam is determined to be 60–75 m, and the corresponding principal stress deflection is about 135°. The control of the surrounding rock in the diagonal direction where the maximum principal stress is concentrated should be paid attention to. |
| first_indexed | 2024-03-08T22:53:04Z |
| format | Article |
| id | doaj.art-f52cb06c9bfb432e9d522224b2c69cb3 |
| institution | Directory Open Access Journal |
| issn | 1947-5705 1947-5713 |
| language | English |
| last_indexed | 2024-03-08T22:53:04Z |
| publishDate | 2023-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Geomatics, Natural Hazards & Risk |
| spelling | doaj.art-f52cb06c9bfb432e9d522224b2c69cb32023-12-16T08:49:47ZengTaylor & Francis GroupGeomatics, Natural Hazards & Risk1947-57051947-57132023-12-0114110.1080/19475705.2023.2227327Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seamsWenli Zhai0Fulian He1Liang Li2Jiayu Song3Xuhui Xu4Kai Lv5Deqiu Wang6Qing Ma7School of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, ChinaAbstractThe traditional index to determine the width of the stopping coal pillar (WSCP) is generally only the front abutment pressure, but the direction of the principal stress will deflect due to the mining action, which brings significant challenges to controlling the surrounding rock. Based on theoretical calculation and numerical simulation, we studied the deflection law of principal stress under mining action, quantified the bearing capacity of roadway surrounding rock, and determined WSCP. The results show that: (1) With the deflection of the principal stress, the distribution of the surrounding rock plastic zone also rotates; (2) [Formula: see text] and repeated mining dominate and aggravate the deflection angle and range of the principal stress in front of the working face, respectively. When [Formula: see text] is close to 1, the deflection of principal stress should be paid attention to in determining WSCP; (3) The anchorage composite bearing structure (ACBS) provides a scientific basis for quantifying the bearing capacity of surrounding rock. WSCP of the lower coal seam is determined to be 60–75 m, and the corresponding principal stress deflection is about 135°. The control of the surrounding rock in the diagonal direction where the maximum principal stress is concentrated should be paid attention to.https://www.tandfonline.com/doi/10.1080/19475705.2023.2227327Close-distance coal seamsmining actionprincipal stress deflectionACBSWSCPsurrounding rock control |
| spellingShingle | Wenli Zhai Fulian He Liang Li Jiayu Song Xuhui Xu Kai Lv Deqiu Wang Qing Ma Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seams Geomatics, Natural Hazards & Risk Close-distance coal seams mining action principal stress deflection ACBS WSCP surrounding rock control |
| title | Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seams |
| title_full | Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seams |
| title_fullStr | Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seams |
| title_full_unstemmed | Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seams |
| title_short | Study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close-distance coal seams |
| title_sort | study on deflection of principal stress and deformation characteristics of roadway surrounding rock under mining action in close distance coal seams |
| topic | Close-distance coal seams mining action principal stress deflection ACBS WSCP surrounding rock control |
| url | https://www.tandfonline.com/doi/10.1080/19475705.2023.2227327 |
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