Results 251 to 260 of about 1,504,519 (328)
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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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Physica Scripta, 2023
In the context of rock fragmentation, the application of high voltage electric pulses results in the transfer of electrical energy onto the surface of the rock material, leading to a rapid electrical breakdown and the formation of a plasma channel.
Pingping Rao +5 more
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In the context of rock fragmentation, the application of high voltage electric pulses results in the transfer of electrical energy onto the surface of the rock material, leading to a rapid electrical breakdown and the formation of a plasma channel.
Pingping Rao +5 more
semanticscholar +1 more source
International journal for numerical and analytical methods in geomechanics (Print)
During shield tunneling in composite strata, the disc cutter's abnormal damage rate rises sharply under interface impact, due to strata inhomogeneity. This study investigates the dynamic response and the cause of the peak impact force of disc cutters at ...
Shangqu Sun +4 more
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During shield tunneling in composite strata, the disc cutter's abnormal damage rate rises sharply under interface impact, due to strata inhomogeneity. This study investigates the dynamic response and the cause of the peak impact force of disc cutters at ...
Shangqu Sun +4 more
semanticscholar +1 more source
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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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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Wear of polycrystalline rock-breaking tool
Russian Engineering Research, 2017An improved method is proposed for assessing cutter wear in the certification of rock-breaking tools.
G. V. Borovskii +4 more
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Arabian Journal for Science and Engineering, 2021
As a new tool of hard rock breaking, abrasive slurry jet (ASJ) is of great potential in tunneling and mining. Therefore, this paper presents a new system, shearer drum assisted by ASJ, to exploit thin seam with complex geology, in which coal rock will be broken by the coupled forces of ASJs and cutting picks.
Wang Fengchao +4 more
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As a new tool of hard rock breaking, abrasive slurry jet (ASJ) is of great potential in tunneling and mining. Therefore, this paper presents a new system, shearer drum assisted by ASJ, to exploit thin seam with complex geology, in which coal rock will be broken by the coupled forces of ASJs and cutting picks.
Wang Fengchao +4 more
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The Physics of Fluids
Compared to continuous abrasive jet and high-pressure water jet, pulsed abrasive water jet can intermittently generate high water hammer pressure and is commonly used in applications such as coal mining and petroleum engineering for rock-breaking ...
Jian-ping Wei +4 more
semanticscholar +1 more source
Compared to continuous abrasive jet and high-pressure water jet, pulsed abrasive water jet can intermittently generate high water hammer pressure and is commonly used in applications such as coal mining and petroleum engineering for rock-breaking ...
Jian-ping Wei +4 more
semanticscholar +1 more source