Mechanisms of Surrounding Rock Failure and Control Measures When Main Roof Fractures Directly Above Gob-Side Entry in Thick Coal Seam
Source abstract
Abstract
This study investigates the surrounding rock failure caused by the fracture line of the main roof above the gob-side roadway during fully mechanized top-coal caving mining in a 19 m thick coal seam. As mining progresses, stress concentration occurs in the roadway roof. Furthermore, the fracture line of the main roof above the roadway poses a significant threat to the structural stability of the gob-side roadway, leading to the localized failure of the roof structure, which consequently affects the safe and efficient production of the mine. This study investigates the shear failure mechanism of the roadway top coal and analyzes the failure characteristics and stress evolution law of the surrounding rock when the main roof fracture line (MRFL) is located above the roadway through three integrated approaches: theoretical analysis, numerical simulation, and physical similarity modeling. To effectively mitigate damage to the top coal, it is proposed to implement a five-hole tray coupled with high-strength prestressed anchor cables for reinforcing the surrounding rock, while compact wooden piles in combination with single pillars are employed to strengthen the roadway support control measures. It is verified by field tests that these control methods significantly improve the stability of coal above the entry and greatly mitigate the likelihood of surrounding rock failure.
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Research context
OpenAlex topics: Geomechanics and Mining Engineering · Geoscience and Mining Technology · Geotechnical and Geomechanical Engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
Anhui Hengyuan Coal & Electric Co., Ltd., Huaibei 234011, China
Songxinzhuang Coal Mine, Ningxia 751504, China
School of Mechanical and Mining Engineering, The University of Queensland, St. Lucia, Brisbane 4072, Australia
Jizhong Energy Co., Ltd., Xingdong Mine, Xingtai 054000, China
Funding
National Natural Science Foundation of China · China Postdoctoral Science Foundation · Fundamental Research Funds for the Central Universities
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