Design of impact working elements for excavation of slot headings
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It is recommended to drive a slot heading with formation of lead faces in the near-wall areas followed by the breaking of the pillar remaining in the middle part of the working. The lead face should be 10–20 mm wide. The pillar exposure degree should be 1.15–1.55.
The performance of the slot formation process Π∼A3/2n, where A is a unit stroke energy and n is the stroke frequency. Therefore, it is more efficient to increase the energy of a single stroke rather than the stroke frequency.
The optimum criterion for the parameters of the impact system with the electro-mechanical drive is the maximum value of the ratio A3/2n.
KeywordsRock Burst Impact System Slot Width Pillar Width Single Stroke
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