Mechanism and Control of Asymmetric Floor Heave in the Gob-Side Coal Roadway under Mining Pressure in Extra-Thick Coal Seams

Deqiu Wang (), Yun Zheng (), Fulian He, Jiayu Song, Jianlong Zhang, Yanhao Wu, Pengpeng Jia, Xiaohui Wang, Baoping Liu, Feifei Wang, Yajiang Zhang and Kai Tao
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Deqiu Wang: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Yun Zheng: School of Safety Engineering, North China Institute of Science and Technology, Langfang 065201, China
Fulian He: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Jiayu Song: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Jianlong Zhang: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Yanhao Wu: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Pengpeng Jia: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Xiaohui Wang: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Baoping Liu: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Feifei Wang: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Yajiang Zhang: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Kai Tao: School of Energy & Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

Energies, 2023, vol. 16, issue 13, 1-19

Abstract: Due to their tense mining succession relationship, gob-side roadways may undergo significant deformation under multi-mining pressure. In this article, many methods, such as on-site research, a theoretical analysis, a numerical simulation and an industrial experiment, are used to research the mechanism of asymmetric floor heave in a gob-side coal roadway affected by mining pressure during the mining of extra-thick coal seams. Our main research is as follows: (1) By monitoring the floor deformation in the roadway on site, it is concluded that the roadway floor shows asymmetry, indicating that the floor displacement near the coal pillar side is relatively large. (2) Based on a lateral overburden structure model of the roadway, the calculation formulas of the horizontal vertical stress caused by the roadway excavation and the excavation of the upper working face are derived separately, and the vertical stress coupling curves on both sides of the roadway during the mining of the upper working face are obtained through a numerical simulation. It is concluded that the cause of the asymmetric floor heave in the roadway is an uneven distribution of vertical stress. (3) The numerical simulation shows a symmetrical distribution of the floor displacement curve during the roadway excavation with a max. displacement of 49.5 mm. The floor displacement curve during the mining of the upper working face is asymmetric with a max. displacement of 873 mm at a distance of 1 m from the central axis near the coal pillar side. The range of the plastic zone in the roadway gradually expands with the mining of the upper working face, and the maximum depth of floor failure is 5.5 m. (4) According to the cooperative control principle of “roof + two sides + floor”, an asymmetric floor heave joint control scheme of “floor leveling + anchor cable support + concrete hardening” is proposed. The floor deformation monitoring results indicate that the max. floor heave at the measurement point near the coal pillar in the roadway is 167 mm, and the floor heave is effectively controlled.

Keywords: mining pressures; gob-side coal roadway; asymmetric floor heave; failure mechanism; cooperative control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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