Volume 42, N. 1, January-April 2019 | PDF(5 downloads)
The purpose of this work is the calculation of the optimal parameters involved with advanced drilling of gas-draining holes. These holes are made to floor entryways and provide an efficiency test for floor degas extractions, like the AB bed at the Uralkali’s Berizniki Ore Development Unit No 2 and Unit No 4 (Mine 2 and Mine 4). Current conditions and entry floor mechanisms affect the gassy outburst analysis of the potash mines. The optimal parameters of gas-draining holes at the Mine 2 and Mine 4 are calculated. The effectiveness test of advance drilling in a potash mine is made. Promising technologies for preparation and extraction, that help reduce the dangers associated with rockbursts from entry floors, have been proposed. Implementation of advance drilling in potash mines have significantly improved the safety of Mine 2’s and Mine 4’s AB bed preparation and extraction. A conclusion was made, based on the results of gassy outburst calculations of entry floors, that mitigation of hazards can be achieved by both degassing, and through the use of mining equipment that minimizes the size of floor cutting layers. The remaining ore, in the floor, helps eliminate the adverse effects of rockbursts.