Results 211 to 220 of about 3,271 (259)
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Journal of Testing and Evaluation, 2023
ABSTRACT Rock breaking by double hydraulic hammers has a wide application prospect in hard-rock roadway excavation because of its environmental protection and strong rock-breaking ability, but the optimal spacing under double-indenter synchronous impact is not clear.
Zhongwen Yue +6 more
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ABSTRACT Rock breaking by double hydraulic hammers has a wide application prospect in hard-rock roadway excavation because of its environmental protection and strong rock-breaking ability, but the optimal spacing under double-indenter synchronous impact is not clear.
Zhongwen Yue +6 more
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A high-power hydraulic drill for breaking hard rock
Soviet Mining Science, 19741. Direct impact of the striker mass on the rock can greatly increase the impact energy and the efficiency of the apparatus. 2. Automatic operation of the mechanism for opening the ports increases the frequency of impacts of the hydraulic drill. 3. A hazardous state which can occur in the absence of obstacles to impact can be
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Effectiveness of the use of high impact energies for breaking hard ledge rocks
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 19731. The higher the impact energy, the lower is the value of the stresses which must be induced in a rock mass being broken. 2. The use of high impact energies creates more favorable stresses for the percussion tool. 3. In the case of high-energy impact, with increasing hardness of the rock the rate of rock breaking will either
B. V. Voitsekhovskii +2 more
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Experimental Investigation of Hard Rock Breaking Using a Conical Pick Assisted by Abrasive Water Jet
Rock Mechanics and Rock Engineering, 2020Rock breaking using conical picks is a complex process affected by several factors; its performance is directly related to the excavation rate of rock tunnels, which is important in terms of the economic benefits and social impact of a project. This study investigates the effects of cutting depth and water pressure on rock breaking performance using a ...
Songyong Liu +5 more
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Research on the Application of Pulsed High Voltage Electric Field to Breaking Hard Rock Uranium Ore
2020 4th International Conference on HVDC (HVDC), 2020Uranium is the most basic material for the operation of nuclear power plants. Research on methods for extracting uranium efficiently and pollution-free is one of the hot issues in nuclear energy development. In nature, uranium is abundant in hard rock, but it is often wraped by volcanic rock.
Yi-Hua Rao +3 more
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Deep-Hole Drilling Using Rock-Breaking Tool Set with Super-Hard Composites
1990The Institute for Super-Hard Materials (ISM) has done much research work on the development of new super-hard composite materials which combine hard alloys and diamond. The combination of two highly efficient tool materials, differing in nature, allows making composites which are favorably comparable with large natural diamonds in terms of wear ...
I. F. Vovchanovskiy, N. A. Bondarenko
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Review of Scientific Instruments, 2021
To improve the efficiency of hard rock breaking by a pulsed water jet (PWJ), a hydraulically controlled piston-pressurized PWJ (HCPPPWJ) device has been developed, by which the large amplitude pressurization of the jet could be realized through the motion coupling of the piston and the valve core inside the device without requiring additional control ...
Yuanfei Ling +5 more
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To improve the efficiency of hard rock breaking by a pulsed water jet (PWJ), a hydraulically controlled piston-pressurized PWJ (HCPPPWJ) device has been developed, by which the large amplitude pressurization of the jet could be realized through the motion coupling of the piston and the valve core inside the device without requiring additional control ...
Yuanfei Ling +5 more
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International Journal for Numerical and Analytical Methods in Geomechanics
ABSTRACT The wear problem of disc cutters during large‐diameter shield tunneling in hard rock stratum has become increasingly prominent, significantly increasing engineering construction costs. Aiming at the disc cutter wear problem during large‐diameter shield tunneling in hard rock stratum, this paper analyzes the rock‐breaking form
Shang‐Qu Sun +5 more
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ABSTRACT The wear problem of disc cutters during large‐diameter shield tunneling in hard rock stratum has become increasingly prominent, significantly increasing engineering construction costs. Aiming at the disc cutter wear problem during large‐diameter shield tunneling in hard rock stratum, this paper analyzes the rock‐breaking form
Shang‐Qu Sun +5 more
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Journal of Cultural Economics, 2013
Though there is a long tradition of band members quitting the group or taking a hiatus, the rock group as an organization to produce music continues to be both popular and economically viable. The research question addressed in this paper is whether or not it is a good idea to quit or take a hiatus from the group.
Ronnie J. Phillips, Ian C. Strachan
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Though there is a long tradition of band members quitting the group or taking a hiatus, the rock group as an organization to produce music continues to be both popular and economically viable. The research question addressed in this paper is whether or not it is a good idea to quit or take a hiatus from the group.
Ronnie J. Phillips, Ian C. Strachan
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Numerical simulation of rock-breaking mechanisms by triple-ridged PDC cutter in hard rocks
Geoenergy Science and Engineering, 2023Wenhao He +9 more
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