Optimisation research on a thin coal seam isolated island coal face mining back channel layout and its support parameters

Abstract

The large deformation and serious failure of the anchor bolt (cable) of a thin coal seam island coal face retrieval mining roadway is a very difficult technical problem to solve. This article is based on the background of the Jizhong Energy Company Handan Mining Group Guo Erzhuang mine 22204 face mining. Through research, theoretical analysis, numerical simulation and experimental methods that revealed the characteristics of the perimeter rock of the roadway and the destruction mechanism, the composite support scheme of 'anchor + anchor cable + lining' was designed to calculate the reliability of the ultimate bearing capacity of the scheme. The simulation analysis of the design with numerical simulation software was used to verify the rationality of the support scheme. Finally, the composite support was successfully applied in the Guo Erzhuang mine. The onsite monitoring results showed a 64% reduction in the roof subsidence and a 70% reduction in the deformation of two gangway. The support scheme effectively controlled the convergent deformation of the retrieval roadway and achieved good industrial testing expectations. The results of the research could provide a reference for the control technology of a thin coal seam island coal face retrieval roadway under similar geological conditions. [Received: October 30, 2020; Accepted: February 03, 2022]