Comparative analysis of the mine pressure at non-pillar longwall mining by roof cutting and traditional longwall mining

Journal of Geophysics and Engineering - Tập 16 Số 2 - Trang 423-438 - 2019
Peng Zhou1, Yajun Wang2, Genliang Zhu3, Yubing Gao1
1State Key Laboratory for Geomechanics & Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
2Department of Geotechnical Engineering, College of civil engineering, Tongji University, Shanghai 200092, China
3Masdar Institute, Khalifa University of Science and Technology, Abu Dhabi, UAE

Tóm tắt

Abstract Non-pillar coal mining has been developed and implemented in the recent decades in China's coal mining industry. The non-pillar longwall mining by roof cutting without pre-excavated entry (N00 mining method) is one of the latest non-pillar mining methods and this method has the advantages of reduced roadway drivage ratio and increased resource recovery ratio. Previous studies show that the mining pressure during the working face advancing is one of the main factors that affect the stability of underground structures and the safety production. However, there is no evaluation or analysis of the mining pressure at the mining face using entry retaining with roof pre-cutting and an absence of pre-excavated tail entry. In this paper, both field monitoring and numerical simulation approaches are employed in the analysis of the mining pressure distribution characteristics within a range of the whole working face during the face advancing. The results are compared with the field data and simulation results from the traditional mining method performed in the same coal mine. Results supported the idea that the N00 mining method can generate a low-stress area for the retained entry. The stability of the working face and retained entry can be well maintained due to the mine pressure optimization. This paper can aid in the understanding of structural mechanic modeling and mine pressure distribution features, structural mechanic analysis and mine pressure distribution features of the N00 mining method.

Từ khóa


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Thông tin
Thông tin xuất bản

Journal of Geophysics and Engineering

Tập 16 Số 2

423-438

Thông tin tác giả