A numerical modeling approach for assessment of progressive caving of strata and performance of hydraulic powered support in longwall workings

A numerical modeling approach is proposed for predicting the progressive caving behaviour of strata and performance of powered roof support in a given geo-mining and strata condition. The study suggests that face convergence slope of 75 mm/m of face advance may be considered as the maximum permissible value for selection of optimal capacity support for safe working in a given strata condition. The study also reveals that en masse caving of strata is responsible for dynamic loading leading to collapse of supports if they are not designed to discharge the fluid at the desired rate.