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METHODOLOGICAL ASSESSMENT OF THE EFFICIENCY OF
ADVANCED PROTECTION OF FORMATIONS INCLINED TO GASDYNAMIC PHENOMENA
S.P. Minieiev1*,
A.A. Kostrytsia, N.O. Kalugina2, O.S. Yanzhula3,
R.N. Sachko3
1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine
2Institute for Physics of Mining Processes
of the National Academy of Sciences of Ukraine, Dnipro, Ukraine
3PJSC “Donetsksteel “Iron and steel works”
Pokrovsk, Ukraine
*Corresponding author:
e-mail: sergmineev@gmail.com
Physical and
technical problems of mining production,
2021, (23), 79-97.
https://doi.org/10.37101/ftpgp23.01.006
full text (pdf)
ABSTRACT
Purpose. Development
of a methodology and refinement of a methodology for assessing the effectiveness of advanced protection of formations prone to hydro-stimulation.
Methodology. When
mining outburst-hazardous
coal seams, a regulatory framework is used for
forecasting and combating gas-dynamic phenomena (GDN). The most effective method is considered
to be the complete protection of the mined coal
seam. The protective effect of the advanced
development of coal seams to prevent hydroelectric events in the protected
seams is determined only by the characteristics
of the protective seam and interbedded rocks. On the
basis of these provisions, regulatory documents have been developed
that regulate the issues of defensive engineering.
The essence
of the normative method for determining the effectiveness of a protective action is as
follows. Depending on the depth
of development and the width
of the mined-out space of the protective
layer, the standard range of the protective
action is found during over- and underworking.
The standard range is adjusted
taking into account the critical thickness of the protective
layer and the total content
of sandstones in the interbedded
rocks. The calculated range of the protective
action determined in this way
is compared with the actual
thickness of the rocks between
the layers and the indicator
of the effectiveness of the protective action is calculated,
according to the value of
which the category of protection is determined.
Scientific novelty. The
established property of coal seams
protected from gas-dynamic phenomena to form a protective
action of advanced development showed that the process of forming a protective action is carried out by the
physical system "protective layer - interbed - protected layer". The latter is formed
due to the activation of the process
of unloading the formation during its development, due to the thickness
of the protected formation, its sorption properties and residual gas content, structure, degree of metamorphism,
etc.
Practical significance. The
proposed methodology will make it
possible to more objectively determine the efficiency of advanced development of reservoirs to prevent hydroelectric events, eliminating type I errors, i.e. when GDDs occur
in effectively protected areas.
Keywords: efficiency control, protective layer, ineffective protection, protected layer, interbedded rocks
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