Voussoir beam model for lower strong roof strata movement in longwall mining – Case study
The paper presents the influence of varying immediate roof thickness on the lower strong roof strata movement and failure pattern in longwall coal mining with large mining height. The investigation is based on 58 geological drill holes and hydraulic shield pressure measurements around the longwall P...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2017-12-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775516302207 |
| _version_ | 1818507437341147136 |
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| author | Chuang Liu Huamin Li Hani Mitri Dongjie Jiang Huigui Li Junfa Feng |
| author_facet | Chuang Liu Huamin Li Hani Mitri Dongjie Jiang Huigui Li Junfa Feng |
| author_sort | Chuang Liu |
| collection | DOAJ |
| description | The paper presents the influence of varying immediate roof thickness on the lower strong roof strata movement and failure pattern in longwall coal mining with large mining height. The investigation is based on 58 geological drill holes and hydraulic shield pressure measurements around the longwall Panel 42105 of the Buertai Mine in Inner Mongolia Autonomous Region, China. The longwall Panel 42105 is characterized by relatively soft immediate roof strata of varying thickness superposed by strong strata, herein defined as lower strong roof. A voussoir beam model is adopted to interpret the structural movement of the lower strong roof strata and shield pressure measurements. It is shown that when the immediate roof is relatively thick, the broken overlying lower strong roof tends to form a stable voussoir beam with previously broken layer, thus not exerting high pressure on the hydraulic shield and working face. When the immediate roof is relatively thin, the broken overlying lower strong roof tends to behave as a cantilever beam, thus exerting higher pressure on the hydraulic shield and working face. Comparison of model predictions with measured time-weighted average shield pressure (TWAP) shows good agreement. |
| first_indexed | 2024-12-10T22:18:23Z |
| format | Article |
| id | doaj.art-5c17013377b44c0aab17ca8e6ebc0890 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-12-10T22:18:23Z |
| publishDate | 2017-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-5c17013377b44c0aab17ca8e6ebc08902022-12-22T01:31:23ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552017-12-01961171117610.1016/j.jrmge.2017.07.002Voussoir beam model for lower strong roof strata movement in longwall mining – Case studyChuang Liu0Huamin Li1Hani Mitri2Dongjie Jiang3Huigui Li4Junfa Feng5School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaDepartment of Mining and Materials Engineering, McGill University, Montreal, H3A 0E8, CanadaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaThe paper presents the influence of varying immediate roof thickness on the lower strong roof strata movement and failure pattern in longwall coal mining with large mining height. The investigation is based on 58 geological drill holes and hydraulic shield pressure measurements around the longwall Panel 42105 of the Buertai Mine in Inner Mongolia Autonomous Region, China. The longwall Panel 42105 is characterized by relatively soft immediate roof strata of varying thickness superposed by strong strata, herein defined as lower strong roof. A voussoir beam model is adopted to interpret the structural movement of the lower strong roof strata and shield pressure measurements. It is shown that when the immediate roof is relatively thick, the broken overlying lower strong roof tends to form a stable voussoir beam with previously broken layer, thus not exerting high pressure on the hydraulic shield and working face. When the immediate roof is relatively thin, the broken overlying lower strong roof tends to behave as a cantilever beam, thus exerting higher pressure on the hydraulic shield and working face. Comparison of model predictions with measured time-weighted average shield pressure (TWAP) shows good agreement.http://www.sciencedirect.com/science/article/pii/S1674775516302207Immediate roof thicknessVoussoir beamCantilever beamShield pressure |
| spellingShingle | Chuang Liu Huamin Li Hani Mitri Dongjie Jiang Huigui Li Junfa Feng Voussoir beam model for lower strong roof strata movement in longwall mining – Case study Journal of Rock Mechanics and Geotechnical Engineering Immediate roof thickness Voussoir beam Cantilever beam Shield pressure |
| title | Voussoir beam model for lower strong roof strata movement in longwall mining – Case study |
| title_full | Voussoir beam model for lower strong roof strata movement in longwall mining – Case study |
| title_fullStr | Voussoir beam model for lower strong roof strata movement in longwall mining – Case study |
| title_full_unstemmed | Voussoir beam model for lower strong roof strata movement in longwall mining – Case study |
| title_short | Voussoir beam model for lower strong roof strata movement in longwall mining – Case study |
| title_sort | voussoir beam model for lower strong roof strata movement in longwall mining case study |
| topic | Immediate roof thickness Voussoir beam Cantilever beam Shield pressure |
| url | http://www.sciencedirect.com/science/article/pii/S1674775516302207 |
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