Geostatistical analysis of longwall face roof convergence data

Summary Roof convergence and the rate of convergence are regionalized variables; the geostatistics can thus be applied to a set of underground observations. This investigation shows that the removal of a slice of coal induces roof movement. The rate of convergence is highest just after the coal removal and decreases with time. The immediate advance of a rigid powered roof support decreases the total convergence for a complete production cycle. On the other hand, the timing of the advance of a relatively soft support element has no influence on the total convergence for a complete production cycle.