Blasting-hydraulic breaking

BLASTING-HYDRAULIC BREAKING (EN: hydraulic blasting; DE: Wasserschießabbau; FR: abattage hydraulique à l'explosif; ES: arranque hidraulico por explosion; RU: взрывогидравлическая отбойка) is the destruction of the near-stope part of the massif, which has been preliminarily weakened using the explosion, using the hydromonitor jets of the water; this method is used during the development of the coals with the strength f >= 2, and also during the breaking of the coal within the short stopes in case of the manless excavation with the hydraulic transportation.

During the process of the blasting works, in case of the blasting-hydraulic breaking, one part of the massif is broken, and another part is weakened with the large quantity of the cracks. They detonate the charges of the explosive substance within the long (deep) boreholes (the most effective and safe method), or within the blastholes with the length of up to 3 metres, and also from 3 to 6 metres. For the borehole method of the blasting-hydraulic breaking, there has been developed within the USSR the complex of the drilling equipment (drilling column, drilling tools, automatic hydraulic lock, and hydraulic charger).