4.7 Article

In-situ experimental study on hydro-borehole technology application to improve the hard coal excavating techniques in coal mine

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SCIENTIFIC REPORTS
卷 13, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41598-023-28501-7

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This paper presents an innovative hydro-cutting technology for bituminous coal excavation, and analyzes its effectiveness through in-situ experiments and modeling. The results show that the distance between the water nozzle outlet and sidewall, water jet pressure, and nozzle type significantly affect hydro-mining effectiveness. Experimental tests in a Polish coal mine demonstrate that water pressure in the range of 20-40 MPa has only a minor impact on coal structure, while high pressure of 80-100 MPa significantly affects it. The tests also reveal the importance of operating time and water jet distance in coal excavation effectiveness.
The hydro-mining technology is considered as a promising method of bituminous coal excavation. The paper presents the results of the in-situ experimental campaign and modelling of hydro-cutting technology application. The proposed innovative technology was tested in terms of the effects of the distance between the outlet of water from the nozzle and a sidewall, pressure of the water jet, as well as the type of a nozzle on hydro-mining effectiveness. The hydro-cutting tests of coal seam performed in the Experimental Mine Barbara in Poland proved that the increase in water pressure in the range 20-40 MPa only slightly affects the coal face structure, while high pressure, of 80-100 MPa, has a significant impact on a coal face structure. The experimental results also showed the major effects of operating time as well as the distance of the water jet on the effectiveness of coal face mining.

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