• Prediction of strata caving characteristics and its impact on longwall operation - Winton Gale

    Recent advances in computer simulation together with field measurements of caving and microseismic activity about longwall panels, has allowed a much better understanding of the caving process and the variability due to geology. The joint research between SCT Operations and CSIRO Division of Exploration and Mining has initiated new methods of computational modelling predicting various caving patterns and strata failure far ahead of the longwall face. This work was validated by field measurements of caving and microseismic activity at the longwall face.

    The rock fracture distribution and the caving characteristics of a range of strata sections have been simulated by computer methods. Validation studies of the method were addressed together with case studies. The interaction of caving with support convergence and face control is presented. The method allows the simulation of longwall support behaviour under various geological conditions. The system also allows a prediction of the monitoring data, which is best suited to give an early warning of weighting events or signal various key caving characteristics. Prediction-of-strata-caving-characteristics-and-its-impact-on-longwall-operation-Winton-Gale-1998.pdf2.9 MB
  • Investigation into Temporary Roof Support Principles - Winton Gale

    An investigation was undertaken in regard to Temporary Roof Support (TRS) systems incorporated into miner bolters. Two and three dimensional modelling was utilised to document the effects a TRS system may have on the surrounding underground environment. TRS systems were found to have little if any effect on strata stability about a simulated roadway but are considered capable of providing protection against minor roof falls where the operator is within the defined protection zone. Each system requires the combination of mesh, bolts and support points to provide a protective zone to the operators. In difficult conditions there is no substitute for bolting as close to the face as possible and the concept of a zone of influence about a support point, as indicated by industry guidelines is not considered as a suitable protection zone. Investigation-into-Temporary-Roof-Support-Principles-W.Gale.pdf1.8 MB
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