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The rock damage mechanism of combined rock breaking with saw blade and conical pick
Scientific Reports, 2023 The combined rock breaking method with the saw blade and conical pick is proposed to improve the rock breaking efficiency. The numerical simulation of combined rock breaking with the saw blade and conical pick is established to investigate the rock ...
Zhiwen Wang +5 more
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Energy Exploration & ExploitationTo expedite drilling operations in hard rock of coal mines, a new type of impact-shear drill bit was developed, and its mechanism of speed-up and efficiency increase was studied.
Pei Ju, Dongzhuang Tian
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Research on rock damage characteristics of gravity tunneling machine based on different rotational speeds [PDF]
Scientific ReportsTo address the challenges of difficult rock excavation and low mechanical breaking efficiency in vertical shafts, a gravity-driven shaft tunneling machine with improved adaptability for medium-hardness rock tunneling has been developed.
Xiang-Fei Jin +6 more
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Rock-breaking mechanism and experimental analysis of confined blasting of borehole surrounding rock
International Journal of Mining Science and Technology, 2017 The rock-breaking mechanism and effect of confined blasting were analysed by blasting and impact dynamic mechanics, fluid dynamic mechanics, fracture mechanics as well as blasting experiment.
Liu Changyou, Yang Jingxuan, Yu Bin
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Machines, 2023 In this paper, we propose an ultrasonically coupled mechanical rock-breaking technology, creatively design an ultrasonically coupled mechanical rock-breaking drum, concurrently develop an ultrasonic cracking simulation method based on test coordination ...
Chengwen Liu +6 more
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Numerical simulation study on rock-breaking process and mechanism of compound impact drilling
Energy Reports, 2021 Improving the rock-breaking efficiency of hard rock formation has always been of concern in drilling. Compound impact drilling technology is a new method to achieve efficient crushing of hard rock by exerting axial and torsional impacts on the drilling ...
Wei Wang +4 more
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Theoretical and numerical studies of rock breaking mechanism by double disc cutters
International Journal of Mining Science and Technology, 2023 A plane mechanical model of rock breaking process by double disc cutter at the center of the cutterhead is established based on contact mechanics to analyze the stress evolution in the rock broken by cutters with different spacings.
Yiqiang Kang +6 more
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Current reversals in a rocking ratchet: Dynamical versus symmetry-breaking mechanisms [PDF]
Physical Review E, 2010 Directed transport in ratchets is determined by symmetry-breaking in a system out of equilibrium. A hallmark of rocking ratchets is current reversals: an increase in the rocking force changes the direction of the current. In this work for a bi-harmonically driven spatially symmetric rocking ratchet we show that a class of current reversal is precisely ...
Cubero Gómez, David +2 more
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Energy Science & Engineering, 2021 Compound percussive drilling technology is a new method to improve the rock‐breaking efficiency in deep hard formation. In order to study the rock‐breaking mechanism of compound impact drilling, the thermal‐structure coupling simulation of the dynamic ...
Wei Wang +5 more
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Heat-fluid-solid coupling mechanism of supercritical carbon dioxide jet in rock-breaking
Petroleum Exploration and Development, 2021 Aiming at the synergistic rock-breaking mechanism of supercritical carbon dioxide (SC-CO2) jet pressure and temperature difference, a heat-fluid-solid calculation model of rock-breaking stress was established and verified to be effective, and the ...
Mukun LI +5 more
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