Coal and rock fracturing by high-velocity water jets

This article describes the studies into hydraulic and hydroabrasive cutting of coal, rocks and other solid materials. The most wide-spread technique in this regard is the highpressure water jet slotting. Efficiency of rock cutting by a thin water jet is governed by the factor of slot depth. The hydraulic cuttability is represented by the hardness ratio and the temporal crushing strain of coal and rocks. It is possible to enhance the damaging capability of the high-pressure water jets by adding them with abrasive materials. The basic patterns and rational parameters of hydraulic and hydroabrasive rock cutting are found. The mathematical models of the cutting processes are constructed. The proposed design of a hydroabrasive cutting tool has a water channel of variable geometry to ensure the maximal damaging capability of hydroabrasive water jets and to make the tool adaptable to different secondary operations eventual in mining and construction. The hydroabrasive water jet cutting tool has successfully passed the lab-scale and full-scale testing.

Keywords: high-velocity water jet, solid material cutting, rock cuttability criterion, basic patterns, rational parameters, mathematical models of cutting processes, hydroabrasive tool, jetforming nozzles, variable water channel geometry.
For citation:

Merzlyakov V. G., Derevyashkin I. V., Boykova I. E., Tolmachev A. I. Coal and rock fracturing by high-velocity water jets. MIAB. Mining Inf. Anal. Bull. 2023;(4):140-156. [In Russ]. DOI: 10.25018/0236_1493_2023_4_0_140.

Acknowledgements:
Issue number: 4
Year: 2023
Page number: 140-156
ISBN: 0236-1493
UDK: 622.232.5
DOI: 10.25018/0236_1493_2023_4_0_140
Article receipt date: 28.11.2022
Date of review receipt: 06.02.2023
Date of the editorial board′s decision on the article′s publishing: 10.03.2023
About authors:

V.G. Merzlyakov1, Dr. Sci. (Eng.), Professor, e-mail: vgm458@mail.ru,
I.V. Derevyashkin1, Dr. Sci. (Eng.), Professor, e-mail: robotron-04@mail.ru,
I.E. Boykova1, Head of Laboratory, e-mail: bie07@list.ru,
A.I. Tolmachev, Cand. Sci. (Eng.), Assistant of Chair, Gubkin branch of National University of Science and Technology «MISiS», 309186, Gubkin, Russia,
1 Moscow Polytechnic University, 107023, Moscow, Russia.

 

For contacts:

V.G. Merzlyakov, e-mail: vgm458@mail.ru.

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