Scale model studies of strata movement around mine roadways—IV. Roadway shape and size

Abstract Results are given of a scale model study to investigate the effect of roadway shape and size upon the closures occurring in ribside roadways which had either a solid ribside or a ribside pack. It is shown that a decrease in roof curvature, or an increase in roadway width or to a lesser extent an increase in roadway height, all give rise to an increase in roadway closure. It is also shown that a pentagonal roadway, a circular roadway and a hexagonal roadway give lower closures than those observed in a normal arched roadway.