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rigid polyurethane foam

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-03-16
  • Date accepted
    2023-12-27
  • Date published
    2024-04-25

Comprehensive assessment of deformation of rigid reinforcing system during convergence of mine shaft lining in unstable rocks

Article preview

Operation of vertical mine shafts in complex mining and geological conditions is associated with a number of features. One of them is a radial displacement of the concrete shaft lining, caused by the influence of mining pressure on the stress-strain state of the mine workings. A rigid reinforcing system with shaft buntons fixed in the concrete lining thus experiences elastoplastic deformations, their value increases with time. It results in deviation of conductors from design parameters, weakening of bolt connections, worsening of dynamic properties of geotechnical system “vehicle – reinforcing”, increase of wear rate of reinforcing system elements, increase of risks for creating an emergency situation. The article offers a comprehensive assessment of displacements of characteristic points of the bunton system based on approximate engineering relations, numerical modeling of the deformation process of the bunton system and laser measurements of the convergence of the inner surface of the concrete shaft lining. The method was tested on the example of the reinforcing system of the skip-cage shaft of the potash mine. Displacement of the characteristic points of the reinforcing system is determined by the value of radial displacements of the surface of the concrete shaft lining. Evaluation of the radial displacements was made using monitoring measurements and profiling data. The results obtained make it possible to justify the need and timing of repair works. It is shown that the deterioration of the reinforcing system at different levels occurs at different rates, defined, among other things, by mechanical properties of the rock mass layers located at a given depth.

How to cite: Tarasov V.V., Aptukov V.N., Ivanov O.V. Comprehensive assessment of deformation of rigid reinforcing system during convergence of mine shaft lining in unstable rocks // Journal of Mining Institute. 2024. Vol. 266 . p. 305-315. EDN TNNIZP
Mining
  • Date submitted
    2018-05-07
  • Date accepted
    2018-07-06
  • Date published
    2018-10-24

Hydraulic transportation of thickened tailings of iron ore processing at Kachkanarsky GOK based on results of laboratory and pilot tests of hydrotransport system

Article preview

The object of study is the system of hydrotransport of iron ore processing tailings at JSC «EVRAZ Kachkanarsky GOK». The aim of the work was to determine the parameters of the hydraulic transport of tailings of the iron ore enrichment at weight concentrations of the solid phase from 30 to 70 % and to develop recommendations for the industrial operation of hydraulic transport systems of highly concentrated slurries of the Tailing Facilities of the Kachkanarsky GOK. Laboratory studies of the parameters of hydrotransport of thickened tail pulps were carried out with the development of a calculation method; pilot tests of the hydrotransport system under the conditions of the Tailing Facilities of the Kachkanarsky GOK. It has been established that using polyurethane coatings on the inner surface of the slurry lines significantly (1.75 times) decrease the specific pressure loss on the hydrotransport of thickened fluids. This allows to significantly increase the range of transportation for placing tailings in the distant parts of the storage zone. The introduction of research results is in the project of reconstruction and development of the tailing facility of the TF of the Kachkanarsky GOK for the period 2018-2020. It is proposed to use the results of work in the project of reconstruction of the hydraulic transport system at the TF of the Kachkanarsky GOK by switching to the hydraulic transport of slurries thickened to weight concentrations of 35-40 % in the slurry pipes with an internal polyurethane coating, which will ensure energy saving in the hydraulic transport process.

How to cite: Aleksandrov V.I., Vasileva M.A. Hydraulic transportation of thickened tailings of iron ore processing at Kachkanarsky GOK based on results of laboratory and pilot tests of hydrotransport system // Journal of Mining Institute. 2018. Vol. 233 . p. 471-479. DOI: 10.31897/PMI.2018.5.471
Geoecology and occupational health and safety
  • Date submitted
    2015-08-09
  • Date accepted
    2015-10-05
  • Date published
    2016-04-22

Inorganic and organic vitreous foam materials and prospect of environmental cleaning from oil and oil products pollutions

Article preview

The analysis of own experimental materials which are part of the new scientific direction – complex research of physical and chemical regularities of novel inorganic and organic vitreous sorbents and investigation of the oil and oil products absorption processes by that sorbents developed on department of the General and Physical Chemistry of National Mineral Resources University (Mining University) under the leadership of the author of this paper is provided. In particular, specifics of kinetic curves of oil absorption for sorbents with a vitreous surface are experimentally established and theoretically proved by the conducted researches.

How to cite: Kogan V.E. Inorganic and organic vitreous foam materials and prospect of environmental cleaning from oil and oil products pollutions // Journal of Mining Institute. 2016. Vol. 218 . p. 331-338.
Development of solid mineral deposits
  • Date submitted
    2010-07-12
  • Date accepted
    2010-09-22
  • Date published
    2011-03-21

Researches of coagulation of dust fraction at application of the aerofoamy way of dust-depressing

Article preview

In places of possible allocation of a dust, near sources of it`s formation or at allocation places ways of dust-depressing now are applied. Principal views of dust-depressing are: a water irrigation (including, the ionized water), an irrigation steam (fog), a foamy irrigation (aerofoams, air-mechanical foams). In arcticle the aerofoamy way of dust-depressing, the dust fraction based on coagulation in an air stream is considered at aerofoam application.

How to cite: Kamenskii A.A. Researches of coagulation of dust fraction at application of the aerofoamy way of dust-depressing // Journal of Mining Institute. 2011. Vol. 189 . p. 138-140.
Applied and fundamental research in physics and mathematics
  • Date submitted
    2009-09-01
  • Date accepted
    2009-11-19
  • Date published
    2010-06-25

Structural features of gas-liquid mixture

Article preview

the effectiveness of the foam flush drilling connects of foam ability to reduce the friction force and drilling shaft oscillation. The main factors are foam viscosity and foam bubble’s diameter.

How to cite: Muraev Y.D., Shkryabin V.L., Guseinov S.Z. Structural features of gas-liquid mixture // Journal of Mining Institute. 2010. Vol. 187 . p. 79-82.
Mining
  • Date submitted
    2009-08-01
  • Date accepted
    2009-10-05
  • Date published
    2010-02-01

Using of steam condensing way of dust-depressing in different manufacturing operations during mining

Article preview

In places of possible allocation of a dust, near sources of its formation or at allocation places ways of dust-depressing now are applied. Principal views of dust-depressing are: a water irrigation (including dispersing, the ionized water), a foamy irrigation (aerofoams, air-mechanical foams), an irrigation steam (fog). In article condensation of steams of water on a surface of hygroscopic particles is considered stream-condensation way of dust-depressing, based on action.

How to cite: Smirnov Y.D., Kamenskii A.A., Ivanov A.V. Using of steam condensing way of dust-depressing in different manufacturing operations during mining // Journal of Mining Institute. 2010. Vol. 186 . p. 82-85.
Problems in geomechanics of technologeneous rock mass
  • Date submitted
    2009-07-19
  • Date accepted
    2009-09-11
  • Date published
    2010-04-22

Calculation of supports of parallel workings divided with yieldable pillars at anthracite seams

Article preview

The article presents the methods for calculation of supports of parallel workings divided with yieldable pillars at anthracite seams. Consideration is given to the development of experimental data card for protection and maintenance of paired conveyor entries with using the steelpolymer anchor supports.

How to cite: Stradanchenko S.G., Titov N.V., Privalov A.A., Turuk Y.V. Calculation of supports of parallel workings divided with yieldable pillars at anthracite seams // Journal of Mining Institute. 2010. Vol. 185 . p. 152-157.