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- W593123933 abstract "CURRENT RESEARCH INTO VARIOUS WAYS OF ECONOMICALLY EXCAVATING MATERIAL FOR TUNNEL OPENINGS IS DESCRIBED. METHODS OF WEAKENING ROCK BY APPLYING HEAT FROM DIFFERENT TYPES OF SOURCES, SUCH AS LASERS AND FLAME JETS ARE OUTLINED. THE APPLICATION OF LASERS IS NOT PRACTICAL AT PRESENT LEVELS OF LASER CAPITAL COST AND OPERATING EFFICIENCY. RESULTS OF COMPARING THE LATTER WITH OTHER HEATER SYSTEMS ARE PRESENTED. THE USE OF CHEMICALS AND HIGH- VELOCITY FLUID JETS TO WEAKEN AND FRACTURE ROCK IS ALSO DESCRIBED. /RRL/" @default.
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- W593123933 date "1970-07-01" @default.
- W593123933 modified "2023-09-27" @default.
- W593123933 title "U.S. RESEARCH TO REDUCE TUNNELLING COSTS" @default.
- W593123933 hasPublicationYear "1970" @default.
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