Results 201 to 210 of about 10,541 (260)
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IEEE Transactions on Industry Applications, 1977
A technique has been developed for rock breaking which could be considered as an alternative to drilling and blasting. A series of tests and measurements involving initial dielectric breakdown achieved with high frequency power, followed by highly localized heating achieved by capacitor discharge energy is described.
R. S. Segsworth, K. Kuhn
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A technique has been developed for rock breaking which could be considered as an alternative to drilling and blasting. A series of tests and measurements involving initial dielectric breakdown achieved with high frequency power, followed by highly localized heating achieved by capacitor discharge energy is described.
R. S. Segsworth, K. Kuhn
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Developments in rock-breaking techniques
Tunnelling and Underground Space Technology, 1994Abstract A problem with secondary breaking at an Australian mine led to a study of new rock-breaking technologies. Many of the techniques being developed had emerged from the thrust in the U.S.A. for continuous drill-break excavation. Such approaches to rock breaking highlighted the applicability of what normally would be classified as tunnelling ...
C. Murray, S. Courtley, P.F. Howlett
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Electric Impulse Technology – Breaking Rock
2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe), 2020Hard rock destruction and comminution is directly linked with a high energy demand and high costs. Conventional tools are working against the compression strength of the rock. This results in an intense wear of the used tools due to the high forces needed to destroy hard rock.
Matthias Voigt +4 more
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2016
Based on fieldwork in Kinshasa and Paris, Breaking Rocks examines patronage payments within Congolese popular music, where a love song dedication can cost 6,000 dollars and a simple name check can trade for 500 or 600 dollars. Tracing this system of prestige through networks of musicians and patrons – who include gangsters based in Europe, kleptocratic
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Based on fieldwork in Kinshasa and Paris, Breaking Rocks examines patronage payments within Congolese popular music, where a love song dedication can cost 6,000 dollars and a simple name check can trade for 500 or 600 dollars. Tracing this system of prestige through networks of musicians and patrons – who include gangsters based in Europe, kleptocratic
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Soviet Mining Science, 1980
Rock can be successfully drilled with a tubular rock-breaking tool in a high-energy percussive rig, fitted over the outer surface of the striker mass, surrounding it, and pushed ahead of the striker mass by an amount of the order of the wall thickness of the tool.
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Rock can be successfully drilled with a tubular rock-breaking tool in a high-energy percussive rig, fitted over the outer surface of the striker mass, surrounding it, and pushed ahead of the striker mass by an amount of the order of the wall thickness of the tool.
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Physics, 2014
A new computational model of porous materials like sandstone shows what happens microscopically when the material is stressed to the breaking point.
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A new computational model of porous materials like sandstone shows what happens microscopically when the material is stressed to the breaking point.
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Stability of rock pillars between penetrated rock-breaking indenters
Strength of Materials, 1990The formation of spalls with penetration of different types of indenters into rock is modeled by the finite-element method. Conditions in which there is chipping of rock pillars between penetrated indenters are investigated.
Yu. B. Gnuchii +3 more
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THE EFFECT OF ROCK BIT CUTTING STRUCTURE ON ROCK BREAKING EFFICIENCY
Proceedings of International Meeting on Petroleum Engineering, 1986ABSTRACT A study of the effect of rock bit cutting structure on rock breaking efficiency was made with full scale bits for soft to medium formations on a laboratory testing rig. An analysis of the relationship between rock breakage and cutting structure based on the drilling rate, bottom hole pattern and operating parameters revealed the
Jikang Hou, Zhaofeng Luo
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Science, 2006
Contrary to common perception, the breaking of rocks is usually not caused by the expansion of water upon freezing.
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Contrary to common perception, the breaking of rocks is usually not caused by the expansion of water upon freezing.
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