Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar
In order to study the changing rules of displacement filed and stress field of overlying strata on isolated pillar with filling mining method, a self-designed model of isolated pillar with an equivalent mining height and a monitoring system of stress is employed to study the progressive failure of o...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2020/8820886 |
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| author | Yang Chen Dong Li Fuxing Jiang Lili Zhang Cunwen Wang Sitao Zhu |
| author_facet | Yang Chen Dong Li Fuxing Jiang Lili Zhang Cunwen Wang Sitao Zhu |
| author_sort | Yang Chen |
| collection | DOAJ |
| description | In order to study the changing rules of displacement filed and stress field of overlying strata on isolated pillar with filling mining method, a self-designed model of isolated pillar with an equivalent mining height and a monitoring system of stress is employed to study the progressive failure of overlying strata and the changing rules of induced displacement and stress, as the equivalent mining height increases. The findings from the trial tests show the following: (1) When the equivalent mining height is small, the overlying strata on the isolated coal pillar only bend and subside, but the overlying strata located on the goafs of two sides remain stable. (2) As the equivalent mining height increases, the degree of stress concentration on section coal pillar will rise and produce plastic failure in the first place near large caving goaf. The strata can subside between isolated working face and adjacent large caving goaf. (3) As the equivalent mining height increases further, new cracks in the roof of isolated working face will unite the cracks of carving goaf on two sides in horizontal direction, leading to a significant rise of the height of cracks. Three goafs will evolve into a large carving goaf, and the vertical cracks on the outer side of the carving goaf intersect with one another to form “fracture band”. The research acquires the key points for prevention in mining the isolated coal pillar with filling method and provides guidelines to implement this technique and to prevent rock burst. |
| format | Article |
| id | doaj-art-0d7564df5dd5440ea89a89b194f7319c |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-0d7564df5dd5440ea89a89b194f7319c2025-02-03T06:46:58ZengWileyShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/88208868820886Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal PillarYang Chen0Dong Li1Fuxing Jiang2Lili Zhang3Cunwen Wang4Sitao Zhu5Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, ChinaSafety Engineering College, North China Institute of Science and Technology, Beijing 101601, ChinaCivil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Building Engineering, Zibo Vocational Institute, Zibo, Shandong 255314, ChinaResearch Center for Rock Burst Control, Shandong Energy Group Co., Ltd., Jinan, Shandong 250014, ChinaCivil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, ChinaIn order to study the changing rules of displacement filed and stress field of overlying strata on isolated pillar with filling mining method, a self-designed model of isolated pillar with an equivalent mining height and a monitoring system of stress is employed to study the progressive failure of overlying strata and the changing rules of induced displacement and stress, as the equivalent mining height increases. The findings from the trial tests show the following: (1) When the equivalent mining height is small, the overlying strata on the isolated coal pillar only bend and subside, but the overlying strata located on the goafs of two sides remain stable. (2) As the equivalent mining height increases, the degree of stress concentration on section coal pillar will rise and produce plastic failure in the first place near large caving goaf. The strata can subside between isolated working face and adjacent large caving goaf. (3) As the equivalent mining height increases further, new cracks in the roof of isolated working face will unite the cracks of carving goaf on two sides in horizontal direction, leading to a significant rise of the height of cracks. Three goafs will evolve into a large carving goaf, and the vertical cracks on the outer side of the carving goaf intersect with one another to form “fracture band”. The research acquires the key points for prevention in mining the isolated coal pillar with filling method and provides guidelines to implement this technique and to prevent rock burst.http://dx.doi.org/10.1155/2020/8820886 |
| spellingShingle | Yang Chen Dong Li Fuxing Jiang Lili Zhang Cunwen Wang Sitao Zhu Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar Shock and Vibration |
| title | Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar |
| title_full | Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar |
| title_fullStr | Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar |
| title_full_unstemmed | Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar |
| title_short | Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar |
| title_sort | use of the equivalent mining height method for understanding overlying strata movement and stress distribution in an isolated coal pillar |
| url | http://dx.doi.org/10.1155/2020/8820886 |
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