Structure of regenerated roof and determination of support load in re-mining stope

To determine the reasonable support load in re-mining stope, the zoning characteristics of the structure of regenerated roof are obtained through theoretical calculation, field observation and roof structure detection, and a structural model for the regenerated roof is established. Based on this model, the structural mechanical model for the support and the regenerated roof is developed in combining with the field observation and similar material simulation experiments. The expression for support load is derived by using the mechanical model. The calculation of a field example and site verification are performed. The results indicate that the structure of the regenerated roof can be divided into four zones, namely, cemented regeneration zone, weak cemented compaction zone, fissure zone and bending zone. The rock mass born by the support can be classified into two regions, namely, fully bearing region (region A) and partly bearing region (region B). The monitoring data of field support load show good agreement with the calculated results of a practical example using the formulas derived from the mechanical model for the support and regenerated roof.