osInternational Journal of Civil Engineering and Technology (IJCIET)
Volume 10, Issue 04, April 2019, pp. 2074-2082, Article ID: IJCIET_10_04_216
Available online at http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=10&IType=04
ISSN Print: 0976-6308 and ISSN Online: 0976-6316
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INFLUENCE OF A STATE OF INTERPANEL
PILLARS ON SPONTANEOUS COMBUSTION
OF COAL
Dmitry Dmitrievich Golubev
Ph.D. candidate, Department of Mining of mineral deposits, Saint-Petersburg mining
university, Russian Federation, 199106, Saint-Petersburg, Vasilievski ostrov, 21 linia, 2
Pavel Nikolaevich Dmitriyev
Ph.D., Associate Professor, Department of Mining of mineral deposits, Saint-Petersburg
mining university, Russian Federation, 199106, Saint-Petersburg, Vasilievski ostrov, 21 linia,
2
Alexander Andreevich Sankovsky
Ph.D., Associate Professor, Department of Mining of mineral deposits, Saint-Petersburg
mining university, Russian Federation, 199106, Saint-Petersburg, Vasilievski ostrov, 21 linia,
2
ABSTRACT
The main objective of researches was assessment of a stress-strain state of regional
parts of a rock massif and coal pillars at various seam thickness, panel width and a
mining depth. Dependences of extent of zones of limit state on the main geological and
mining parameters are established. The increased hazard of mining of thick flat seams
with the increased width of longwall panel is shown. Recommendations about decrease
in the endogenous fire hazard connected with disintegration of regional parts of seam
and chain enter panel coal pillars are made.
Key words: underground mining, spontaneous combustion, longwall, inter panel
pillar, rib spall, stress and strain state, numerical analysis, goaf.
Cite this Article: Dmitry Dmitrievich Golubev, Pavel Nikolaevich Dmitriyev and
Alexander Andreevich Sankovsky, Influence of a State of Interpanel Pillars on
Spontaneous Combustion of Coal. International Journal of Civil Engineering and
Technology, 10(04), 2019, pp. 2074-2082
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\http://www.iaeme.com/IJCIET/index.asp
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Dmitry Dmitrievich Golubev, Pavel Nikolaevich Dmitriyev and Alexander Andreevich
Sankovsky
1. INTRODUCTION
Longwall mining is the main method of underground coal mining in Russia. Application of
fully mechanized longwall provides high technical-and-economic indexes of coal mining.
Despite high technical-and-economic indexes of longwall mining hewing the risk of the
accidents connected with methane explosions continues to remain unacceptably high. The
largest accidents have happened to huge number of the victims in Russia in 2007 (Ulyanovsk
mine, 110 people have died), in 2010 (Raspadskaya mine, 100 people have died), 2015 (the
Severnaya mine, 36 people have died). One of probable causes of the majority of the accidents
connected with methane explosion according to some scientists is spontaneous combustion of
coal [1-4]. It should be noted that in the Kuznetsk coal basin about 70% of seams are prone to
spontaneous ignition. The problem of the endogenous fires continues to remain relevant for
mines of Russia: the endogenous fires increase danger of mining operations and also appear
considerable negative impact on ecology of the region [5-12]. According to the normative
documents existing in Russia mining of the seams prone to spontaneous ignition should be
carried out with leaving of the inter panel not disintegrated pillars which are reliably isolating
earlier mined longwall panel and excluding air leakages. The goaf, is specified as the main
place of emergence of the endogenous fires. At the same time in recent years a number of
researchers draw a conclusion that pillars can increase hazard of spontaneous combustion as
their regional part crush out, creating congestions of the disintegrated coal, and along pillars
an opportunity for an air course remains [13-14]. Besides, some authors specify heat production
at disintegration of coal under action of rock pressure as the conditions promoting spontaneous
combustion [15-19]. To issues of studying of a stress-strain state the considerable number of
researchers was engaged [20-41]. However, in recent years on coal mines of Russia the
tendency to increase in panel width and growth of a mining depth was outlined in the Kuznetsk
coal basin that has led to increase in loads of regional parts of an array and inter panel pillars.
Thus, studying of a state of regional parts of an array and inter panel chain coal pillars is of
interest to assessment of a possibility of forming of congestions of the disintegrated coal which
is chemically active material for spontaneous combustion.
2. METHODS
For studying of a stress-strain state of inter panel pillars and regional parts of the rock massif
the finite element method is used. Modeling it is carried out for conditions plainly of the
deformed state. The applied design layout is presented on figure 1. The model consists of one
seam, two mined-out areas, an enter panel chain pillar and two entries. Calculation of model is
made taking into account the weight of rocks. Goaves are modelled as filled with the broughtdown rocks with use of bulk density of rocks and the lowered deformation and strength
characteristics. Entries are set as cavities, the timbering is not modelled. In model nonlinearity
of strains and failure of material due to application of model of Coulomb Mora and a task of
the passport of strength for coal seam is considered.
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Influence of a State of Interpanel Pillars on Spontaneous Combustion of Coal
Figure 1 2D model of rock massif
When performing researches the dependence of a state of regional parts of rock massif (was
studied from local entries) and states of an enter panel pillar from a mining depth at the panel
width of 300 m. Depth of conducting works of 400 m, a seam thickness of 3.7 m, panel width
of 200 and 300 m, width of a pillar is 30 m.
3. RESULTS AND DISCUSSION
As a result of the numerical analysis stress fields for various panel widths (200 m and 300 m),
various mining depth (400 m, 500 m, 600 m), various seam thickness (1.7 m, 2.5 m, 3.7 m) are
received. An example of the received results of researches is set in figure 2. Over and under
mined-out areas destressed zones are formed, at the same time the destressed zone in a seam
roof has considerably the larger size. In regional parts of a seam and an enter panel pillar
bearing pressure zones are formed. Stresses in a pillar exceed stress in a regional part of a seam
as a result of imposing of bearing pressure from two mined-out areas.
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Dmitry Dmitrievich Golubev, Pavel Nikolaevich Dmitriyev and Alexander Andreevich
Sankovsky
Figure 2 Fields of vertical stress (width of longwall panel 300 m), Pa
For studying of influence of a seam thickness calculation of stress in an enter panel pillar
has been executed. Figure 2 shows stress distribution in a pillar at various panel width: 200 m
and 300 m. From figure 2 it is visible that increase in panel width leads to growth of stress in
a pillar and to increase in a zone of limit state in its regional parts. Increase in panel width by
100 m the drive to increase in a zone of limit state approximately on 0.8 m. Leads to increase
in the sizes of a zone of limit state also increase in a seam thickness and mining depth.
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Influence of a State of Interpanel Pillars on Spontaneous Combustion of Coal
Figure 3 Diagram of stress distribution in the enter panel coal chain pillar
Figure 4 shows stress distribution around entry in a regional part of seam on border with a
mined-out space at the panel width of 200 m and 300 m. Apparently from figure 4 increase in
panel width leads to growth of extent of a zone of limit state (to shift of a maximum of bearing
pressure from a mined-out area). Thus, panel width also has a considerable impact on a state
of a regional part of seam and conditions of maintenance of local entries.
Figure 4 Diagram of stress distribution in the regional part of the seam at a mined-out area (goaf)
The executed researches have shown that with increase in extraction height of seam
increase in a zone of limit state and a zone of a соal sloughing in regional parts of a seam and
pillars is observed. Increase in panel width also leads to growth of the sizes of a zone of limit
state of a seam.
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Dmitry Dmitrievich Golubev, Pavel Nikolaevich Dmitriyev and Alexander Andreevich
Sankovsky
4. CONCLUSION
The current trend in increase in panel width and extraction height of seam brings in growth of
a zone of limit state and a coal sloughing that creates conditions for the forming of firedangerous congestions disintegrated (as a result of a coal sloughing) or very cracked coal. Thus
the hazard of spontaneous combustion of coal significantly increases. For decrease in
endogenous fire hazard of mining of thick seams at the increased panel width it is
recommended to pay special attention to a state of regional parts of a seam and enter panel
pillars. For decrease in a coal sloughing in regional parts of a seam and enter panel chain pillars
their strengthening by bolting is possible, their processing by anti-pyrogens is also
recommended.
ACKNOWLEDGMENTS
The authors expresses gratitude for the help in numerical analysis to the associate professor of
department of mineral deposits mining of the Saint-Petersburg Mining University to Andrey
Alexsandrovich Sidorenko.
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