Minieiev S. P., Vasyliev L.M., Trohymets N.Ya., Maltseva V.Ye, Polushyna M.V. Justification of the parameters of rotary-vibration drilling of small-diameter boreholes in rocks based on a submersible cavitation hydrovibrator

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Parent Category: Geo-Technical Mechanics, 2022
Category: Geo-Technical Mechanics, 2022, Issue 162

Geoteh. meh. 2022, 162, 76-84

https://doi.org/10.15407/geotm2022.162.076

 

JUSTIFICATION OF THE PARAMETERS OF ROTARY-VIBRATION DRILLING OF SMALL-DIAMETER BOREHOLES IN ROCKS BASED ON A SUBMERSIBLE CAVITATION HYDROVIBRATOR

1Minieiev S.P., 1Vasyliev L.M.,1Trohymets N.Ya.,  1Maltseva V.Ye, 2Polushyna M.V.

1Institute of Geotechnical Mechanics named by N. Poljakov of the National Academy of Sciences of Ukraine, 2Dnipro University of Technology

UDC 622.831.1:622.234.5:622.807.4

Language: English

Abstract. The article presents the results of laboratory studies of the rotary-vibration drilling method of blast-holes and boreholes of small diameter based on a submersible cavitation hydro-vibrator. A generator that operates in the mode of intermittently stalled cavitation was used as a source of vibration load to the rock-breaking tool. The authors of this article developed and described the design of a submersible cavitation hydro-vibrator at the level of the patent of Ukraine for the invention. In addition, a bench design for laboratory studies of the parameters of a rotary-vibration drilling method was developed and described at the level of a patent of Ukraine for a utility model. It is established that the optimal mode of operation of the cavitation generator is ensured by its cavitation parameter in the range of 0.16-0.2. The geometrical parameters of the cavitation generator in the submersible cavitation hydro-vibrator are determined: the diameter of the critical section is 2.0 mm, the opening angle of the diffuser is 20º, and the outlet diameter is 10.0 mm, and the length of the post-diffuser channel is 200 mm. It is established that under the action of pressure pulses of the washing liquid, which is passed through the cavitation vibrator in the optimal mode, the additional deepening of the rock-breaking tool into the rock sample reaches up to 0.6 mm per rotation. Thus, the drilling speed of small-diameter blast-holes and boreholes (up to 55 mm) with the ЕБГП‑1М drilling rig of the Konotop Machine-Building Plant with the optimal mode of the rotation frequency of the rock-breaking tool, which equals 315 min-1 (5.25 s-1), can be increased by 3∙10-3 m/s, from 23∙10-3 m/s up to 26∙10-3 m/s, which is 13%.
Keywords: the rotary-vibration drilling method, cavitation generator, submersible cavitation hydro-vibrator, mining rock.

 REFERENCES:

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About authors:

Minieiev Serhii Pavlovych, Doctor of Technical Sciences (D.Sc.), Professor, Head of the Department of Pressure Dynamics Control in Rocks, Institute of Geotechnical Mechanics named by N. Poljakov of the National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Vasyliev Leonid Mikhaylovych, Doctor of Technical Sciences (D.Sc.), Professor, Senior Researcher in Department of Pressure Dynamics Control in Rocks, Institute of Geotechnical Mechanics named by N. Poljakov of the National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine.

Trohymets Мyкola Yakovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of Pressure Dynamics Control in Rocks, Institute of Geotechnical Mechanics named by N. Poljakov of the National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine

Maltseva Vira Yevhenivna, Senior Engineer in Department of Pressure Dynamics Control in Rocks, Institute of Geotechnical Mechanics named by N. Poljakov of the National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine.

Polushyna Maryna Vitaliivna, Candidate of Technical Science (Ph.D.), Associate Professor, Associate Professor in Department of Engineering and Design in Machinery Industry, Dnipro University of Technology, Dnipro, Ukraine,  This email address is being protected from spambots. You need JavaScript enabled to view it.

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