Analysis of Roof Stability of Coal Roadway Heading Face

Chao Su, Pengfei Jiang (), Peilin Gong (), Chang Liu, Peng Li and Yuedong Liu
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Chao Su: College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China
Pengfei Jiang: Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China
Peilin Gong: College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China
Chang Liu: Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China
Peng Li: Department of Mining Engineering, Shanxi Institute of Energy, Jinzhong 030600, China
Yuedong Liu: Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China

Energies, 2022, vol. 15, issue 20, 1-17

Abstract: One of the challenges that urgently needs to be addressed, both in current times and in the future, is to improve the heading speed of coal roadways. The roof instability of the heading face is the main factor restricting the rapid heading of coal roadways. Based on the theory of thin plate, a mechanical model of the roof in the heading face is established, the distribution law of deflection, stress, and internal force is discussed, and the supporting principle of the roof is clarified. Through a Flac3D numerical simulation, the main influencing factors of roof stability in the heading face are analyzed, including ground stress, surrounding rock strength, roadway section, unsupported distance, etc., and the regression analysis of each factor is carried out by evaluating the amount of roof subsidence. The results show that the maximum tensile stress and the corresponding bending moment of the roof appear at the fixed supported edge, and the maximum compressive stress and the maximum value of the corresponding bending moment appear at the center of the roof slightly close to the simply supported edge. In the on-site construction process, the position close to the fixed supported edge needs to be supported first. The roof subsidence has a positive exponential relationship with the stress level, a negative exponential relationship with the surrounding rock strength, a quadratic functional relationship with the roadway section, and a logarithmic relationship with the unsupported distance. In fractional support, the initial partial support can timely reduce the roof span and partially recover the confining pressure. Under certain geological and production conditions, the use of fractional support can not only effectively maintain the stability of the roadway but also speed up the heading speed. According to the research results, it is determined that in the auxiliary transportation roadway of the Caojiatan Coal Mine, the 122,110 working face adopts the fractional support model, the maximum roof subsidence is 18 mm, the roof is stable, and the monthly progress is more than 1000 m, which significantly improves the roadway heading speed.

Keywords: heading face; roof stability; thin plate theory; rapid heading (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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