A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Rock Tunneling with High Speed Water Jets Utilizing Cavitation Damage
A test apparatus, capable of producing a 1/4-inch diameter jet up to 500 ft/sec was designed and built. Initial tests with this facility produced erosion intensities of 37 watts/ sq. meter. This value was encouraging and demonstrated that the technique had potential. As a result a three-month extension of the contract was granted so that the operating parameters could be optimized thereby maximizing the erosion intensity. During this period the erosion intensity was improved from 37 watts/ sq. meter to 670 watts/ sq. meter. In addition those relationships such as the time dependence of erosion intensity and its variation with jet velocity were determined. The information was obtained for both a 1/4-inch and 1/8-inch nozzle. Once the behavioral relationships were established attention was directed to means by which the erosion intensity produced could be efficiently used. As a result a nozzle to specimen distance adjustment technique and specimen rotation technique were developed which improved volume removal by two orders of magnitude. Finally, the effect of heat treatment on reducing the strength of rock was briefly examined. (Author)
Rock Tunneling with High Speed Water Jets Utilizing Cavitation Damage
A test apparatus, capable of producing a 1/4-inch diameter jet up to 500 ft/sec was designed and built. Initial tests with this facility produced erosion intensities of 37 watts/ sq. meter. This value was encouraging and demonstrated that the technique had potential. As a result a three-month extension of the contract was granted so that the operating parameters could be optimized thereby maximizing the erosion intensity. During this period the erosion intensity was improved from 37 watts/ sq. meter to 670 watts/ sq. meter. In addition those relationships such as the time dependence of erosion intensity and its variation with jet velocity were determined. The information was obtained for both a 1/4-inch and 1/8-inch nozzle. Once the behavioral relationships were established attention was directed to means by which the erosion intensity produced could be efficiently used. As a result a nozzle to specimen distance adjustment technique and specimen rotation technique were developed which improved volume removal by two orders of magnitude. Finally, the effect of heat treatment on reducing the strength of rock was briefly examined. (Author)
Rock Tunneling with High Speed Water Jets Utilizing Cavitation Damage
R. E. Kohl (author)
1968
52 pages
Report
No indication
English
Fluid Mechanics , Civil Engineering , Road Transportation , Construction Equipment, Materials, & Supplies , Rock(Geology) , Drilling , Construction , Liquid jets , Erosion , Fracture(Mechanics) , Underground structures , Penetration , Cavitation , Transportation , Nozzles , Heat treatment , Damage , Tunnelling(Civil engineering) , Tunnels(Underground structures)
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