FREMGANGSM}TE OG ANORDNING FOR BRYTING AV ET FAST MATERIALE, S}SOM FJELL

Fremgangsmåte og anordning for bry-. ting av et fast materiale, såsom fjell A hard compact material, such as rock, is broken by delivering an explosive into at least one hole which has been pre-drilled in the material to be broken and by forcing a relatively incompressible fluid, such as water, into the hole to impact the explosive to initiate same. Upon detonation of the explosive the fluid stems the hole thereby delaying leakage of blasting gases out of the hole before the material is broken. Preferably, the explosive and the fluid are launched together into the hole. In this case may the explosive and the fluid be encapsulated in a common cover.