Abstract
In this study, the 31113 fully mechanised working face in the Lijiahao Coal Mine was selected as the project background. The failure characteristics and optimum spacing of a double-withdrawal-channel surrounding rock were extensively investigated through field measurements, theoretical analysis, and numerical simulations. The following results were obtained. The loading influence range of the working face was fixed. Under the influence of mining, the stress distribution variation in the double-withdrawal channels with spacing and the influence of stress distribution on the surrounding rock stability of the withdrawal channels were determined. The optimum distance between the double-withdrawal channels to achieve the stability of the surrounding rock was at least 25 m, and engineering measures are required to limit the mining height in the final mining stage. The rationality of the main and auxiliary withdrawal channel spacing of 25 m and measures to limit the mining height in the final stage were demonstrated. The findings of this study provide a valuable reference for constructing the layout of withdrawal channels in the adjacent working faces of the same mining area.
Highlights
Withdrawal channels are unique roadways used for equipment withdrawal after the coal face has finished mining [1]
Based on the above analysis, the withdrawal channel was influenced by the mobile support pressure generated by the mining face as the working face advanced
The coal pillar size of the main and auxiliary withdrawal channels directly influenced the stability of the surrounding rock
Summary
Withdrawal channels are unique roadways used for equipment withdrawal after the coal face has finished mining [1]. Established a calculation model to examine the influence of three factors, i.e., the thickness and position of the interbedded coal seam and the width of the bifurcation roadway rock pillar, on the displacement, plastic zone, and asymmetric deformation of the critical points of the roadway. They analysed the deformation and failure mechanism of the surrounding rock and proposed asymmetric joint control countermeasures [18,19,20]. This study will enable the realisation of safe and efficient mine production and the improvement of economic benefits [26,27,28]
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