Accession Number:

AD0772506

Title:

Study of High Powered Plasma for In Situ Hard Rock Disintegration

Descriptive Note:

Final technical rept. 1 Apr 1972-21 Jul 1973

Corporate Author:

HUMPHREYS CORP BOW NH TAFA DIV

Personal Author(s):

Report Date:

1973-07-21

Pagination or Media Count:

85.0

Abstract:

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 250-500 kW, producing continuous cuts in granite and basalt at 2-12 to 12 inches per minute depending on cut depth which ranged from one to nineteen inches. Thermal melting efficiencies were in the range of 20-30 percent.

Subject Categories:

  • Mining Engineering
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE