Abstract
This work stems from field studies of convergence within gate roads leading to three longwall coal faces with different strata and mining conditions. The influence of production on the stability of these roads is illustrated. Empirical time-dependent equations are developed to express and predict the behaviour of the roadways. The particular contribution of the roadway floor and sides to the total closure of the gate roads has also been investigated. The mode of deformation and failure, observed by scanning electron microscopy within the immediate vicinity of underground gate roads, is also described. The application of this analysis is in the planning of production panels in soft tabular deposits, the dimensioning of gate roads, and the stability and performance prediction of such roadways and their supports. Key words: soft mine floors, longwall mining, gate road stability, coal roads, soft underclay floors.
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