Vasylyev L.M.,Trohimets N.Ya., Vasylyev D.L., Vyalushkin Ye.O. Cavitation device for controlling mode of coal-seam pulse hydroloosening and to prevent sudden outbursts

Details
Parent Category: Geo-Technical Mechanics, 2018
Category: Collection of scientific papers «Geotekhnicheskaya Mekhanika» Issue 140

Geoteh. meh. 2018, 140, 70-80

DOI: https://doi.org/10.15407/geotm2018.03.070

CAVITATION DEVICE FOR CONTROLLING MODE OF COAL-SEAM PULSE HYDROLOOSENING AND TO PREVENT SUDDEN OUTBURSTS

1Vasylyev L.M.,1TrohimetsN.Ya.,  1Vasylyev D.L.,2Vyalushkin Ye.O.

1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 2National Metallurgical Academy of Ukraine

UDC622.003.5:622.807.2

Language: Russian

Abstract.

The article presents functions and principal and structural schemes of cavitation device for controlling modes of coal seam pulse hydro-loosening in order to prevent sudden outbursts. In order to improve efficiency of mining operations in preparatory roadways in gas-bearing prone-to-outburst coal seams with the help of cavitation device for controlling pulse hydroloosening modes in order to prevent coal and gas outbursts, a tunneling complex was designed consisting of heading machine with telescopic boom, electrohydraulic drill for drilling boreholes, device for hydro-pulse effect on the coal seam and high-pressure injection unit. The device for controlling modes of coal seam pulse hydroloosening functions by principle of the Venturi cavitation tube, which creates impulses of fluid pressure on the borehole walls in the face area of the coal seam and forms a network of cracks and weakens the coal seam due to hydroloosening. Mode of pulse hydroloosening is regulated by reducing the excess head pressure in the filtration part of the borehole and discharging a part of the liquid from the filtration part of the borehole through a separate pipeline in the sealer, on which an overflow valve is installed. When implementing this method, all the necessary conditions for preventing coal and gas outbursts during the mining operations in the gas-bearing burst-hazardous coal seams are simultaneously satisfied: physical-mechanical properties of the coal seam are reduced by hydroloosening; during the hydroloosening, face area of the coal seam is unloaded from rock pressure; face area of the coal seam is degassed by the pulse hydroloosening. This method significantly improves safety of mining operations. The safe method was developed for preparatory roadway driving in the gas-bearing prone-to-outburst coal seam with the help of tunneling complex and cavitation device for controlling pulse hydroloosening modes.

Keywords: cavitation device, pulse hydroloosening, gas-bearing burst-hazardous coal seam.

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About the authors:

Vasilyev Leonid Mikhaylovich, Doctor of Technical Sciences (D.Sc.), Professor, Head in Department of Rock Breaking Problems, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine.

Trokhimets Nyкolai Yakovlevich, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of Rock Breaking Problems, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine.

Vasilyev Dmytriy Leonidovich, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of Elastomeric Component Mechanics Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine.

Vyalushkin Yegor Olegovich, Master of Science, National Metallurgical Academy of Ukraine (NMA of Ukraine), Dnepr, Ukraine.