Academic Journal of Architecture and Geotechnical Engineering, 2025, 7(1); doi: 10.25236/AJAGE.2025.070106.
Jianye Feng1, Kang Wang2, Jiasen Chen2, Yikun Liu2, Xiaodong Zheng3, Kun Niu4
1School of Mining Engineering and Geology, Xinjiang Institute of Engineering, Urumqi, 830023, China
2Key Laboratory of Xinjiang Coal Resources Green Mining, Ministry of Education, Xinjiang Institute of Engineering, Urumqi, 830023, China
3Xinjiang Key Laboratory of Coal-bearing Resources Exploration and Exploitation, Xinjiang Institute of Engineering, Urumqi, 830023, China
4Xinjiang Engineering Research Center of Green Intelligent Coal Mining, Xinjiang Institute of Engineering, Urumqi, 830023, China
The roadway support and goaf treatment under the condition of hard and thick roof are key challenges in the coal mining process. The gob-side entry retaining technology provides a new solution. This paper takes the 15311-working face of the 1890 Coal Mine of Xinjiang Jiao Coal Group as the engineering background to conduct research on the design of the reasonable width of the coal-gangue concrete filling body for gob-side entry retaining. By establishing a mechanical action model of gob-side entry retaining, the support resistance of the coal-gangue concrete is calculated to be 14266.96kN, and the bearing capacity of the 1.2-m-wide filling body is theoretically checked. The outcomes demonstrate that it complies with the support requirements. By means of FLAC3D software, numerical models featuring different widths were constructed for analysis. It is thus concluded that the entry-retaining with a 1.2-m-wide filling body exhibits high overall stability and low deformation. Field practice shows that during the entry-retaining period, the overall deformation of the roadway is small, the integrity of the surrounding rock is good, and the entry-retaining effect is satisfactory. Finally, the reasonable width of the coal-gangue concrete filling body in the 15311-working face is determined to be 1.2m. The research findings can serve as a reference for designing the filling body width under analogous geological conditions.
Hard Roof; Coal Gangue Concrete; Gob-side Entry Retaining; Filling Body Width; Numerical Simulation
Jianye Feng, Kang Wang, Jiasen Chen, Yikun Liu, Xiaodong Zheng, Kun Niu. Design of the Appropriate Width of the Filling Body for Gob-side Entry Retaining in Hard and Thick Top Coal with Gangue Concrete. Academic Journal of Architecture and Geotechnical Engineering (2025), Vol. 7, Issue 1: 39-49. https://doi.org/10.25236/AJAGE.2025.070106.
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