Features of elementary burst formation during cutting coals and isotropic materials with reference cutting tool of mining machines
- 1 — Ph.D., Dr.Sci. Professor Saint-Petersburg Mining University
- 2 — Ph.D. Associate professor Saint-Petersburg Mining University
- 3 — Postgraduate student Saint-Petersburg Mining University
Abstract
The paper considers the cutting of brittle coals and rocks by a single cutter of a mining machine, in contrast to the generally accepted integral approach, different from the standpoint of the formation of successive elementary bursts that make up the cut. The process of the formation of an elementary bust in time is viewed as successive phases. Due to the complexity and multi-factor nature of the process, preference is given to experimental bench studies using reference cutters, isotropic materials, and real rock blocks. The bursting parameters values greatly influence the time of static forces action, the peculiarities of the formation of stress fields in the undercutter zone of the rock mass and the conditions for the emergence and development of main cracks in the near-cut zones during the cutting process. The accepted phase-energy method of analyzing the process, which most closely matches the structure of the studied process, revealed a more significant, than previously expected, effect on the cutting process, variability of cutting speed and potential energy reserve in the cutter drive. The paper discusses the possibility of purposeful formation of the parameters of elementary bursts. It describes new ways to improve the efficiency of cutting coal and rocks, in particular, reducing the maximum loads and specific energy consumption. It also considers the possibility of reducing the grinding of the rock mass and dust formation.
References
- Beron A.I., Pozin E.Z. On the assessment of the energy balance of the process of cutting coal. Tr. IGDim. A.A.Skochinskogo. Podzemnayarazrabotkaugol'nykhplastov. 1972. Iss.93, p.10-20 (in Russian).
- Buyalich G.D., Antonov Yu.A., SheikinV.I. On the direction of reducing the stress-strain state of the bottomhole zone of a coal seam. Gornyi informatsionno-analiticheskii byulleten'. 2011. Iss. N2: Gornoe mashinostroenie, p.198-202 (in Russian).
- Dokukin A.V., Frolov A.G. Improving coal mining machines based on the kinetic theory of strength. Nauchn. soobshch. IGD im. A.A.Skochinskogo. 1977. Iss.149, p.33-41 (in Russian).
- Gabov V.V., Solov'ev V.S., Zadkov D.A., Kolomoets G.I. The dependence of the maximum cutting forces of brittle frac-tured coals on the time of the load.Gornoeoborudovanieielektromekhanika. 2006. N7, p.37-39 (in Russian).
- Zagrivnyi E.A., Basin G.G. Formation of the external dynamics of mining machines. Zapiski Gornogo instituta. 2016. Vol.217, p.140-149 (in Russian).
- Gabov V.V., Zadkov D.A., Lykov Yu.V., Gurimskii A.I., Shpil'ko S.I. Features of the operation of roadheaders in the mines of OJSC “Vorkutaugol”. Gornoe oborudovanie i elektromekhanika. 2008. N12, p.2-6 (in Russian).
- Pozin E.Z. The study of the process of destruction of coal by mechanical means in the IHM them. A.A. Skochinsky.Ugol'. 1992. N12, p.60-62 (in Russian).
- Pozin E.Z., Melamed V.Z., Ton V.V. Destruction of coal by excavation machines. Мoscow: Nedra, 1984, p.288 (in Russian).
- Frolov A.G. To the method of solving problems of increasing the output of large classes and reducing dust generation during coal mining. Nauch. soobshch. IGDim. A.A. Skochinskogo. 1972. Iss.100, p.152-161 (in Russian).
- Balaji Aresh. Fundamental Study in to the Mechanics of Material Removal in Rock Cutting: Doktoralthesis. University of Northumbria at Newcastle upon Tyne. 2012, p.169.
- Buyalich G.D., Buyalich K.G., Umrikhina V.Yu. Study of Falling Roof Vibrations in a Production Face at Roof Support Resistance in the Form of Concentrated Force. IOP Conference Series: Materials Science and Engineering. IOP Publishing. 2016. Vol.142. P.012120. DOI: 10.1088/1757-899X/142/1/012120.
- Crosland D., Mitra R., Hagan P. Changes in Acoustic Emissions When Cutting Difference Rock Types. Coal Operators' Conference. University of Wollongong & the Australasian Institute of Mining and Metallurgy. 2009, p.329-339.
- Gabov V.V., Lykov Y.V., Bannikov A.A. Analyzing coal breakage while mining at the mines of Vorkuta. International Mining Conference Advanced mining for sustainable development. Halong, 2010, p.283-285.
- Gabov V.V., Zadkov D.A. Energy-saving modular units for selective coal cutting.Eurasian mining. 2016. N1, p.37-40. DOI: 10.17580/em.2016.01.06.
- Gabov V.V., Zadkov D.A. Peculiarities of stress field formation during cutting isotropic material by mining machine cut-ters. IOP Conf. Series: Earth and Environmental Science. IPDME. 2017. Vol. 87, p.022007. DOI: 10.1088/1755-1315/87/2/022007.
- Hua Gua. Rock cutting studies using fracture mechanics principles. Doctor of Philosophy thesis. Department of Civil and Mining Engineering, University of Wollongong, 1990. p.225.
- Kazanin O.I., Sidorenko А.A. Interaction between gas dynamic and geomechanical processes in coal mines.ARPN Journal of Engineering and Applied Sciences. 2017. Vol.12. Iss.5, p.1458-1462.
- Khair A.W. Research and Innovations for Continuous Miner's Cutting Head, for Efficient Cutting Process of Rock/Coal. 17 International Mining Congress and Exhibition of Turkey-IMCET 2001, p.45-55.
- Shen H.W., Hardy H.R., Khair A.W. Laboratory study of acoustic emission and particle size distribution during rotary cutting.International Journal of Rock Mechanics and Mining Sciences. 1997. Vol.34. Iss.3-4, p.121.e1-121.e16. DOI: 10.1016/S1365-1609(97)00247-5
- Sidorenko А.A., Sishchuk J.M., Gerasimova I.G. Estimation of methane emission from a longwall panel.ARPN Journal of Engineering and Applied Sciences. 2016. Vol.11.N7, p.4448-4454.
- Wang S., Su J., Hagan P. Energy dissipation characteristics of sandstone cutting under mechanical impact load.Computer modelling & new technologies. 2014. 18(3), p.13-20.
- Zadkov D., Bolshakov V. Mining machinery: enhancing cutting efficiency. Russian mining. 2005. N1,р.19-21
- Citation Indexes: 33
- Readers: 3
