Study of High Powered Plasma for In Situ Hard Rock Disintegration.

摘要

The report describes an investigation of hard rock cutting using a transferred arc plasma for melting narrow,deep cuts in hard rock at high speed and removing the intervening rock by thermal fracturing. The one year experimental program resulted in the development of a cutting system capable of operating horizontally and vertically at 250-500kW,producing continuous cuts in granite and basalt at 2-1/2to 12inches per minute depending on cut depth which ranged from one to nineteen inches. Thermal melting efficiencies were in the range of 20-30percent. (Modified author abstract)