Author
Listed:
- Shengquan He
(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science & Technology Beijing, Beijing 100083, China
State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, China)
- Le Gao
(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science & Technology Beijing, Beijing 100083, China)
- Bin Zhao
(School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
China Coal Datong Energy Co., Ltd., Datong 037038, China)
- Xueqiu He
(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science & Technology Beijing, Beijing 100083, China)
- Zhenlei Li
(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science & Technology Beijing, Beijing 100083, China)
- Dazhao Song
(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science & Technology Beijing, Beijing 100083, China)
- Tuo Chen
(Department of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0E8, Canada)
- Yanran Ma
(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science & Technology Beijing, Beijing 100083, China)
- Feng Shen
(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science & Technology Beijing, Beijing 100083, China)
Abstract
To reveal the deformation and failure law of the gob-side roadway (GSR) and the main influencing factors in close extra-thick coal seams, the research methods of field monitoring, theoretical analysis, and numerical simulation are adopted in this paper. Field monitoring data shows that microseismic events occur and accumulate frequently in the surrounding rock and some overlying key layers of the GSR. Large deformation is experienced in the middle part of roadway near the solid coal side, the middle and upper parts of the roadway near the coal pillar side, and the roadway floor. The overlying strata of the GSR are fractured to form a composite structure as “low-level cantilever beam and high-level masonry beam”. The coal pillar is squeezed and effected by the composite beam structure and the rotation moment M , causing serious bulge in middle and upper part of the coal pillar side. The stability of the solid coal side of the roadway is affected by the stress transferred from gangue contact point. Numerical simulation shows that the immediate roof and key layer breakage are induced by the mining of the 30,501 working face. Shear and tension failures happen in the GSR due to overburden subsidence and rotary extrusion. The stress and displacement at the middle and upper of the roadway on the coal pillar side are larger than the other area. Compared with the solid coal side, the coal on the coal pillar side is obviously more fractured, with a lower bearing capacity. The peak stress in the coal pillar shows up 2 m away from the roadway, which is close to the length of bolt support. The mining-induced stress and the stress transferred from gangue contact point are the direct reasons for solid coal bulge beside the roadway. The peak stress on the solid coal side is located 7 m away from the roadway, at the gangue contact point where overburden fractures. The overburden strata loads and the transferred stress near the gangue contact point are transferred from the sides to the roadway floor. Their coupling effect with the in situ horizontal stress acts as the force source for the plastic floor heave.
Suggested Citation
Shengquan He & Le Gao & Bin Zhao & Xueqiu He & Zhenlei Li & Dazhao Song & Tuo Chen & Yanran Ma & Feng Shen, 2023.
"Research on Deformation and Failure Law of the Gob-Side Roadway in Close Extra-Thick Coal Seams,"
Sustainability, MDPI, vol. 15(3), pages 1-20, February.
Handle:
RePEc:gam:jsusta:v:15:y:2023:i:3:p:2710-:d:1055539
Download full text from publisher
References listed on IDEAS
- Bin Zhao & Shengquan He & Xueqiu He & Le Gao & Zhenlei Li & Dazhao Song & Feng Shen, 2022.
"Research on Deformation and Failure Control Technology of a Gob-Side Roadway in Close Extra-Thick Coal Seams,"
Sustainability, MDPI, vol. 14(18), pages 1-23, September.
- Guangzhe Xue & Chao Gu & Xinqiu Fang & Tao Wei, 2019.
"A Case Study on Large Deformation Failure Mechanism and Control Techniques for Soft Rock Roadways in Tectonic Stress Areas,"
Sustainability, MDPI, vol. 11(13), pages 1-24, June.
Full references (including those not matched with items on IDEAS)
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