Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case study
Irregular shape workface would result in the presence of coal pillar, which leads to high stress concentration and possibly induces coal bumps. In order to study the coal bump mechanism of pillars, static and dynamic stress overlapping (SDSO) method was proposed to explain the impacts of static stre...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2018-09-01
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| Series: | International Journal of Mining Science and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268618304804 |
| _version_ | 1811233247903875072 |
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| author | Yixin Zhao Hao Wang Shimin Liu Zonglong Mu Zhiguo Lu |
| author_facet | Yixin Zhao Hao Wang Shimin Liu Zonglong Mu Zhiguo Lu |
| author_sort | Yixin Zhao |
| collection | DOAJ |
| description | Irregular shape workface would result in the presence of coal pillar, which leads to high stress concentration and possibly induces coal bumps. In order to study the coal bump mechanism of pillars, static and dynamic stress overlapping (SDSO) method was proposed to explain the impacts of static stress concentration and tremors induced by mining activities. The stress and deformation in surrounding rock of mining face were analyzed based on the field case study at 1303 workface in Zhaolou Coal Mine in China. The results illustrate that the surrounding rock of a workface could be divided into four different zones, i.e., residual stress zone, stress decrease zone, stress increase zone and original stress zone. The stress increase zone is prone to failure under the SDSO impact loading conditions and will provide elastic energy for inducing coal bump. Based on the numerical modelling results, the evolution of static stress in coal pillar as the size of gob increasing was studied, and the impact of dynamic stress was investigated through analyzing the characteristics of tremor activities. The numerical results demonstrate the peak value of vertical stress in coal pillar rises from about 30 MPa with mining distance 10 m to 52.6 MPa with mining distance 120 m, and the location of peak stress transfers to the inner zone of coal pillars as the workface moves forward. For the daily tremor activities, tremors with high energy released indicate high dynamic stress disturbance on the surrounding rock, therefore, the impact of dynamic stressing is more serious during workface extension period because the tremor frequency and average energy after workface extension are higher than those before the workface extension. Keywords: Coal bump, Coal pillar, Tremor, Irregular shape longwall face, Static and dynamic stress overlapping |
| first_indexed | 2024-04-12T11:17:51Z |
| format | Article |
| id | doaj.art-59a42674adc4430fb43f7cea343c7b90 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-04-12T11:17:51Z |
| publishDate | 2018-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-59a42674adc4430fb43f7cea343c7b902022-12-22T03:35:27ZengElsevierInternational Journal of Mining Science and Technology2095-26862018-09-01285775781Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case studyYixin Zhao0Hao Wang1Shimin Liu2Zonglong Mu3Zhiguo Lu4Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, School of Resources and Safety Engineering, China University of Mining & Technology, Beijing 100083, ChinaBeijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, School of Resources and Safety Engineering, China University of Mining & Technology, Beijing 100083, China; Corresponding author.Department of Energy and Mineral Engineering, G3 Center and EMS Energy Institute, Pennslyvania State University, University Park, PA 16802, USASchool of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaBeijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, School of Resources and Safety Engineering, China University of Mining & Technology, Beijing 100083, ChinaIrregular shape workface would result in the presence of coal pillar, which leads to high stress concentration and possibly induces coal bumps. In order to study the coal bump mechanism of pillars, static and dynamic stress overlapping (SDSO) method was proposed to explain the impacts of static stress concentration and tremors induced by mining activities. The stress and deformation in surrounding rock of mining face were analyzed based on the field case study at 1303 workface in Zhaolou Coal Mine in China. The results illustrate that the surrounding rock of a workface could be divided into four different zones, i.e., residual stress zone, stress decrease zone, stress increase zone and original stress zone. The stress increase zone is prone to failure under the SDSO impact loading conditions and will provide elastic energy for inducing coal bump. Based on the numerical modelling results, the evolution of static stress in coal pillar as the size of gob increasing was studied, and the impact of dynamic stress was investigated through analyzing the characteristics of tremor activities. The numerical results demonstrate the peak value of vertical stress in coal pillar rises from about 30 MPa with mining distance 10 m to 52.6 MPa with mining distance 120 m, and the location of peak stress transfers to the inner zone of coal pillars as the workface moves forward. For the daily tremor activities, tremors with high energy released indicate high dynamic stress disturbance on the surrounding rock, therefore, the impact of dynamic stressing is more serious during workface extension period because the tremor frequency and average energy after workface extension are higher than those before the workface extension. Keywords: Coal bump, Coal pillar, Tremor, Irregular shape longwall face, Static and dynamic stress overlappinghttp://www.sciencedirect.com/science/article/pii/S2095268618304804 |
| spellingShingle | Yixin Zhao Hao Wang Shimin Liu Zonglong Mu Zhiguo Lu Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case study International Journal of Mining Science and Technology |
| title | Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case study |
| title_full | Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case study |
| title_fullStr | Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case study |
| title_full_unstemmed | Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case study |
| title_short | Dynamic failure risk of coal pillar formed by irregular shape longwall face: A case study |
| title_sort | dynamic failure risk of coal pillar formed by irregular shape longwall face a case study |
| url | http://www.sciencedirect.com/science/article/pii/S2095268618304804 |
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