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.

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.

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.

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

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