Ukrainian School of Mining Engineeringhttp://ir.nmu.org.ua/handle/123456789/1534062024-03-28T13:27:59Z2024-03-28T13:27:59ZSelective underground mining of complex structured ore bodies of Kryvyi Rih Iron Ore BasinKalinichenko, VsevolodPysmennyi, SerhiiShvaher, NataliiaKalinichenko, Olenahttp://ir.nmu.org.ua/handle/123456789/1534522019-01-09T10:34:52Z2018-01-01T00:00:00ZSelective underground mining of complex structured ore bodies of Kryvyi Rih Iron Ore Basin
Kalinichenko, Vsevolod; Pysmennyi, Serhii; Shvaher, Nataliia; Kalinichenko, Olena
Selective mining of complex structured ore bodies will enable
increased iron content in the mined ore mass in underground mining at
Kryvyi Rih iron ore basin applying the existing mining systems. The
article determines the way the grade changes in a mine block of a complex
structured ore body when applying bulk and selective mining as well as
factors influencing indices of extracting ore mass from the block. The
investigation results prove that it is reasonable to mine complex structured
ore deposits with barren inclusions applying selective mining if the iron
content in the block varies from 64 to 67% and horizontal thickness of the
barren inclusion makes 4 – 12 m. At that, the thickness ratio should not
exceed 0.3. Stoping methods should be applied to receive high indices of
ore mass extraction. There is determined an ore/barren inclusion-to-ore
body thickness ratio considering the dilution factor that confirms
practicability of selective mining of complex structured ore bodies.
Selective mining of complex structured ore deposits of Kryvyi Rih iron ore
basin applying open stoping enables increasing the mined ore mass quality
without considerable capital and operating costs and, consequently, staying
on the market and enhancing the environmental situation in the region.
2018-01-01T00:00:00ZRecommended and experimental values of the earth surface shift troughs parameters when conducting the stope worksFilatiev, MykhailoFilatieva, Elvirahttp://ir.nmu.org.ua/handle/123456789/1534512019-01-09T10:34:44Z2018-01-01T00:00:00ZRecommended and experimental values of the earth surface shift troughs parameters when conducting the stope works
Filatiev, Mykhailo; Filatieva, Elvira
The correspondence of angular and linear parameters of the
undermined rocks displacement and the crustal movement to their values
determined according to the normative document has been established.
Based on the surveying observations over the reference points movement
on the earth surface and the stope face advance, the empirical curve of the
trajectory of the earth surface maximum subsidence is determined from the
points of maximum subsidence. The curve of the maximum subsidence of
the earth surface points when removing the stope face from the face entry
has been experimentally established, which allowed to determine the
location of the point of the beginning of the crustal movement and the
dimension of the stope mine working corresponding to this situation. The
coordinates of the characteristic points of the earth surface subsidence
above the stope face have been determined. A unified method has been
developed for determining the angular and linear parameters of the
undermined rocks displacement for the two stages of shift troughs
formation on the earth surface. The nonconformities have been established
between the recommended parameters and the experimental data normative
documents during the anthracite seams mining.
2018-01-01T00:00:00ZDevelopment of a three-parameter model of the shoe brake contact interaction with the drum in mine hoisting machineZabolotnyi, KostiantynZhupiiev, OleksandrMolodchenko, Arturhttp://ir.nmu.org.ua/handle/123456789/1534502019-01-09T10:34:50Z2018-01-01T00:00:00ZDevelopment of a three-parameter model of the shoe brake contact interaction with the drum in mine hoisting machine
Zabolotnyi, Kostiantyn; Zhupiiev, Oleksandr; Molodchenko, Artur
For safe operation of mine hoisting machines (MHM) in
the mining industry, it is necessary to provide high constructive
reliability of brake systems, in particular, brake systems based on
the block brake. The contact interaction of the brake with the
translational movement of the shoes applied in MHM, remains
insufficiently studied. In particular, it is necessary to develop a
technique for accurate determination of the braking moment and
forces in the elements of the brake linkage, as well as to study the
nature of the pressure distribution along the brake beam. The
purpose of this article is to simulate the contact interaction of the
MHM brake taking into account the coefficient of friction, the ratio
of the flexural stiffness to the longitudinal stiffness of a beam, as
well as the ratio of the transverse stiffness of a lining to the flexural
stiffness of a beam. The application of the developed model will
help to reduce the maximum contact pressure in the shoe brakes of
the mine hoisting machines and will allow more accurate
calculation of the braking moment value compared to existing
methods.
2018-01-01T00:00:00ZPhysical simulation of integrated protective structuresNehrii, SerhiiNehrii, TetianaPiskurska, Hannahttp://ir.nmu.org.ua/handle/123456789/1534492019-01-09T10:34:41Z2018-01-01T00:00:00ZPhysical simulation of integrated protective structures
Nehrii, Serhii; Nehrii, Tetiana; Piskurska, Hanna
An effective way of protecting development workings by
integrated rock wall structures is considered. The necessity of improving
this method and its experimental verification is substantiated. Integrated
rock wall structures are experimentally tested under laboratory conditions.
On the basis of the results of physical modeling, parameters of integrated
structures have been specified in terms of impact factors; their yield
strength is also specified. The condition for ensuring the stability of the
integrated protective structure, which allows calculating appropriate rock
wall width, is determined.
2018-01-01T00:00:00Z