Abstract
SUMMARY The old subject of stability of chain pillars and a roadway protected by them is dealt with using a new approach. The simple method of the theory of beams on elastic support is used to estimate the one-sided pressure distribution over the chain pillars the goaf being only on one side. It is shown how the mechanical properties involved in the method can be determined measuring roof-seam contact displacements in situ. It is found that even if the pillars per se are stable, the roadway which they protect may still show signs of distress, as given in a case study. A modern rock mass classification has been applied to assess roadway stability.
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