About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems
Analysis of research and publication on concerned topic is given. Analysis of stratigraphic columns of investigated seam is executed. Distance influence from wall face on loading character of mechanized support sections is determined. Regularities of loading changing on support sections at different...
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| Zitieren: | About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems / M.S. Demydov, Ya.A. Shapovalov, D.O. Astafiev, Yu.I. Demchenko // Розробка родовищ: Зб. наук. пр. — 2014. — Т. 8. — С. 165-169. — Бібліогр.: 4 назв. — англ. |
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irk-123456789-1045442016-07-13T03:02:58Z About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems Demydov, M.S. Shapovalov, Ya.A. Astafiev, D.O. Demchenko, Yu.I. Розробка вугільних родовищ Analysis of research and publication on concerned topic is given. Analysis of stratigraphic columns of investigated seam is executed. Distance influence from wall face on loading character of mechanized support sections is determined. Regularities of loading changing on support sections at different advance rate of stoping face are substantiated. Наведено аналіз досліджень і публікацій за даною тематикою. Виконано аналіз стратиграфічних колонок досліджуваного пласта. Визначено вплив відстані від груді вибою на характер навантаження секцій механізованого кріплення. Обґрунтовано закономірності зміни навантаження на секції кріплення при різних швидкостях посування вибою. Приведен анализ исследований и публикаций по данной тематике. Выполнен анализ стратиграфических колонок исследуемого пласта. Определено влияние расстояния от груди забоя на характер нагружения секций механизированной крепи. Обоснованы закономерности изменения нагрузки на секции крепи при различных скоростях подвигания забоя. 2014 Article About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems / M.S. Demydov, Ya.A. Shapovalov, D.O. Astafiev, Yu.I. Demchenko // Розробка родовищ: Зб. наук. пр. — 2014. — Т. 8. — С. 165-169. — Бібліогр.: 4 назв. — англ. 2415-3435 http://dspace.nbuv.gov.ua/handle/123456789/104544 622.261.27 en Розробка родовищ УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України |
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Розробка вугільних родовищ Розробка вугільних родовищ |
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Розробка вугільних родовищ Розробка вугільних родовищ Demydov, M.S. Shapovalov, Ya.A. Astafiev, D.O. Demchenko, Yu.I. About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems Розробка родовищ |
| description |
Analysis of research and publication on concerned topic is given. Analysis of stratigraphic columns of investigated seam is executed. Distance influence from wall face on loading character of mechanized support sections is determined. Regularities of loading changing on support sections at different advance rate of stoping face are substantiated. |
| format |
Article |
| author |
Demydov, M.S. Shapovalov, Ya.A. Astafiev, D.O. Demchenko, Yu.I. |
| author_facet |
Demydov, M.S. Shapovalov, Ya.A. Astafiev, D.O. Demchenko, Yu.I. |
| author_sort |
Demydov, M.S. |
| title |
About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems |
| title_short |
About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems |
| title_full |
About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems |
| title_fullStr |
About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems |
| title_full_unstemmed |
About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems |
| title_sort |
about regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems |
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УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України |
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2014 |
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Розробка вугільних родовищ |
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http://dspace.nbuv.gov.ua/handle/123456789/104544 |
| citation_txt |
About regularities of technological parameters influence on accident–free mining of flat coal seams by plow systems / M.S. Demydov, Ya.A. Shapovalov, D.O. Astafiev, Yu.I. Demchenko // Розробка родовищ: Зб. наук. пр. — 2014. — Т. 8. — С. 165-169. — Бібліогр.: 4 назв. — англ. |
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Розробка родовищ |
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165
УДК 622.261.27 © M.S. Demydov, Ya.A. Shapovalov, D.O. Astafiev, Yu.I. Demchenko
M.S. Demydov, Ya.A. Shapovalov, D.O. Astafiev, Yu.I. Demchenko
ABOUT REGULARITIES OF TECHNOLOGICAL
PARAMETERS INFLUENCE ON ACCIDENT–FREE MINING
OF FLAT COAL SEAMS BY PLOW SYSTEMS
Analysis of research and publication on concerned topic is given. Analysis of stratigraphic
columns of investigated seam is executed. Distance influence from wall face on loading
character of mechanized support sections is determined. Regularities of loading changing on
support sections at different advance rate of stoping face are substantiated.
ПРО ЗАКОНОМІРНОСТІ ВПЛИВУ ТЕХНОЛОГІЧНИХ ПАРАМЕТРІВ НА
БЕЗАВАРІЙНЕ ВІДПРАЦЮВАННЯ ПОЛОГИХ ВУГІЛЬНИХ ПЛАСТІВ СТРУГОВИМИ
КОМПЛЕКСАМИ
Наведено аналіз досліджень і публікацій за даною тематикою. Виконано аналіз
стратиграфічних колонок досліджуваного пласта. Визначено вплив відстані від груді
вибою на характер навантаження секцій механізованого кріплення. Обґрунтовано
закономірності зміни навантаження на секції кріплення при різних швидкостях
посування вибою.
О ЗАКОНОМЕРНОСТЯХ ВЛИЯНИЯ ТЕХНОЛОГИЧЕСКИХ ПАРАМЕТРОВ НА
БЕЗАВАРИЙНУЮ ОТРАБОТКУ ПОЛОГИХ УГОЛЬНЫХ ПЛАСТОВ СТРУГОВЫМИ
КОМПЛЕКСАМИ
Приведен анализ исследований и публикаций по данной тематике. Выполнен анализ
стратиграфических колонок исследуемого пласта. Определено влияние расстояния от
груди забоя на характер нагружения секций механизированной крепи. Обоснованы
закономерности изменения нагрузки на секции крепи при различных скоростях подви-
гания забоя.
ISSUE AND ITS CONNECTION WITH
SCIENTIFIC AND PRACTICAL TASKS
Realization of accident-free operation of
stoping face in modern conditions is actual, but
at same times enough difficult task. In Western
Donbass conditions question about appliance
of new high-productive equipment demands
analysis of mine-geological, mine-technical
and productive factors for whole potential re-
alization.
In consequence of complex impact of
above mentioned factors decrease productiv-
ity of stoping equipment and operations
safety.
With the application of new high-
productive plow systems with daily average
advance rate V = 5 – 12 m/day in conditions of
slightly metamorphized foliated massif was
observed cases of mechanized support trans-
formation to “rigid base”. Previously in same
166
conditions, but at less advance rate this fact
hadn’t been observed.
FORMULATING THE PROBLEM
During seam mining in slightly metamor-
phized rock massif at different values of
mine-geological, mine-technical and produc-
tive factors change character of mechanized
support sections loading.
Hence the problem of prediction of given
factors interrelation and their influence on
steady work of mechanized system has great
scientific and practical importance.
ANALYSIS OF RESEARCH AND PUBLICATION
Parameters of rock movement area during
stoping mining in scientific works of prof.
A. Savostianov [1] had been substantiated by
analytical research of mine massif model that
has joint-block interrelations between ele-
ments.
Solution of this problem had been realized
by collective under command of prof. I. Kiya-
shko (A. Koshka, N. Ovchinnikov, V. Khar-
chenko, etc.) who considered both parameters
of above-the-coal strata movement during
mining of very thin coal seams [2] and inter-
relation of mechanized systems with side
rocks. In scientific work [3] of V. Sulaev was
substantiated mechanism of stratification and
failure of above-the-coal strata in process of
stoping operations conduction.
Because of computer technology develop-
ment and increasing of its processing speed in
recent years appears possibility to simulate
rock massif condition during stoping extraction
with using of finite elements method (FEM).
Collective under command of prof. V. Bon-
darenko (G. Symanovych, I. Kovalevska,
V. Fomychov, etc.) is engaged in this direc-
tion [4].
Although great volume of work in this
area is done, but questions about interrelation
and influence of main mine-geological, mine-
technical and productive factors on mecha-
nized support steadiness of plow face are con-
sidered insufficiently full.
MATERIAL STATEMENT AND RESULTS
The main initial data for assigned tasks so-
lution are quantity indices of following mine-
geological and mine-technical parameters:
– stopping time of stoping face – tstop;
– advance rate of stoping face – Vf ;
– structure of main roof (on investigated
unit);
– distance from sections to wall face – ∆f ;
– section location along the longwall
length.
These parameters were received by pres-
sure monitoring of mechanized support sec-
tions during mining of longwall 161st seam C6
“Stepnaya” mine “Pershotravenskoe” Mine
Management PJSC “DTEK Pavlogradugol”.
During the period of monitoring two times
was observed mechanized plow system trans-
formation to “rigid base” that led to outage
and longtime repair measures on support sec-
tions conditioning.
Greatest challenge for getting consistent
results was unit’s selection with similar struc-
ture of main roof (fig. 1).
Selection criteria of investigated units:
– absence of thick sandstone layers or
other rocks in roof that have increased hard-
ness;
– similar structural composition of roof
(thickness of lithological differences on two
investigated units should not differs on more
than 10 – 15%);
– strength and deformational characteris-
tics of analyzed lithological differences
should not differs on more than 10 – 15%.
Analyzing above represented stratigraphic
columns on fig. 1 along the seam 6С we de-
termining that for further statistical processing
meet the requirements units #1 and 2 that
have similar structure of main roof. That is
why in further research we will apply them as
basic.
167
Unit #1 Unit #2 Unit #3 Unit #4 Unit #5
Fig. 1. Structure of main roof on investigated units
Influence of parameter ∆f on loading char-
acter of mechanized support sections is
enough visibly (fig. 2). Therefore to reach ad-
equateness of results it is necessary to maxi-
mally equalize analyzed groups of sections on
parameter ∆f. Inasmuch as system advancing
is conducted automatically, we can emphasize
three locations of sections towards wall face:
1) maximally advanced (320 – 470 mm); 2) in
medium position (621 – 770 mm); maximally
removed in depth of massif (921 – 1070 mm)
(fig. 2).
As we can see from fig. 2, to exclude in-
fluence of factor ∆f it is necessary to use sec-
tions with minimal loading in further research,
i.e. sections that maximally advanced to face
(fig. 2, blue line).
Let’s consider influence of section loca-
tion along the length of longwall (fig. 2). In-
asmuch as stoping face form has arc form it is
necessary to check load distribution along the
length of longwall.
4 50
400
3 50
300
250
200
150
1 (4-38) 2 (39-76) 3 (77-114) 4 (115-152) (153-198) 5
Sections groups
P
re
ss
ur
e,
P
, B
ar
1
2
3
Fig. 2. Pressure in support sections in view of factor
along the length of longwall at Vf = 9 m/day:
1 – Δf = 921 – 1070 mm; 2 – Δf = 621 – 770 mm;
3 – Δf = 320 – 470 mm
Central part of longwall has advancing be-
fore junctions between extraction mine work-
ings on the average 9 – 12 m that is practi-
168
cally unessentially for loading on mechanized
support at longwall length 200 – 250 m.
As we can see from fig. 2, coordinate of
section location along the length of longwall
practically hasn’t affected on mechanized
support loading:
– as a consequence remain two factors that
have influence on character of sections load-
ing – face stopping time – tstop and advance
rate of stoping face – at Vf;
– surveying of instrumental data were
conducted (fig. 1) on units #1 (2 days) and #2
(2 days).
Data techniques processing that allowing
more authentically analyze results of monitor-
ing were developed.
Essence of this methodology is following:
– surveying of instrumental data on inves-
tigated unit conducts within two days;
– longwall is divided into 5 units where
conduct averaging of instrumental data of
pressure in hydraulic prop;
– with a view to ensuring results authentic-
ity, we choose units with similar structure of
main roof and also exclude influence of those
factors that wasn’t analyzed in this experiment.
Results of conducted research are repre-
sented on fig. 3.
Fig. 3. Pressure variation in support sections of plow
system in standard operating procedure (1 day) and
during face stopping (2 days) at advance rate 6 m/day
and 9 m/day: – standard operating procedure of
face; – face stopping
In such case were analyzed those units
where longwall on first day moved with aver-
age rate near 6 m/day and 9 m/day, whereat
on second day happened face stopping with
duration near 12 hours because of organiza-
tion and technical reasons.
In standard operating procedure of extrac-
tion unit mining when longwall moves with
stable speed without longtime stopping, load-
ing character is qualitatively similar to both
advance rates. It differs only by short time in-
creasing of loading during repair work time in
consequence of operational downtime. How-
ever, at advance rate 6 m/day average load in
standard operating procedure is equal to 355
Bar (35.5 MPa), but at 9 m/day is not more
than 325 Bar (32.5 MPa). Difference is equal
to 10%.
During longtime stopping of extraction unit
(to 12 hours) is observed following regularities
of loading changing on support sections:
– first stage – 4 hours – pressure growth in
support sections for longwall that moving with
rate 6 and 9 m/day is significantly differs. In
first case pressure grew to 377 Bar (37.7 MPa)
and equal to 6.19% from pressure during stan-
dard operating procedure (355 Bar), but in sec-
ond one is equal to 448 Bar (44.8 MPa) that is
37.84% from standard (325 Bar);
– second stage – 8 hours – pressure rises
along the sections to maximum in 450 Bar
(45.0 MPa).
Based on abovementioned, different char-
acter of support loading is observed and in
second case (9 m/day) pressure rises signifi-
cantly harder.
CONCLUSIONS
Based on realized research we can make
following conclusions:
1. For receiving adequate results it is nec-
essary to choose units with similar lithological
composition of roof, rocks that have similar
strength and deformational characteristics for
supplying authentic loading character from
the side of overlying massif.
2. For excluding from analysis influence
169
of factor Vf applies monitoring data only for
maximum advanced to face sections.
3. At advance rate 6 m/day average loa-
ding in standard operational procedure is
equal to 355 Bar (35.5 MPa), but at 9 m/day
not more than 325 Bar (32.5 MPa).
4. During longwall stopping on term to 4
hours at at Vf = 6 m/day pressure rose to
377 Bar (37.7 MPa) that is equal to 6.19%
from standard (355 Bar), but at Vf = 9 m/day –
448 Bar (44.8 MPa) that is 37.84% from stan-
dard (325 Bar).
PROSPECTS OF FURTHER RESEARCH
Further research of given problem can be
separated on few directions, each of which are
very perspective and have great scientific and
practical meaning for longwall non-stop op-
eration guarantee:
1. Definition of more rational advance rate
(both minimal and maximal).
2. Definition of further character of pres-
sure rise on support after longwall stoppings
of different duration with taking into account
advance rate and main roof structure.
3. Definition of main roof structure influ-
ence on character of support sections loading
both during standard operational procedure
and during stoppings of different duration.
4. Definition of factor Vf influence on dis-
tance to wall faces as the main part at multi-
variant analysis.
REFERENCES
1. Савостьянов А.В Управление состоянием массива
горных пород / А.В. Савостьянов, В.Г. Клочков. – К.: УМК
ВО, 1992. – 273 с.
2. Технология и техника, повышающие производи-
тельность труда и качество угля / [И.А. Кияшко,
Н.П. Овчинников, В.П. Сердюк, А.Г. Кошка] // Уголь
Украины. – 1995. – № 6. – 27 с.
3. Савостьянов А.В. Методика определения полостей
расслоения в подработанном горном массиве / А.В. Саво-
стьянов, В.И. Сулаев, С.П. Григорьев // Науковий вісник
НГУ. – 2004. – № 10. – С. 40 – 41.
4. Геомеханика нагружения крепи очистных и под-
готовительных выработок в слоистом массиве слабых
пород: монография / [Бондаренко В.И., Ковалевская И.А.,
Симанович Г.А., Черватюк В.Г.]. – Д.: ЛізуновПрес. –
2012. – 233 с.
ABOUT AUTHORS
Demydov Maksym Serhiyovych – assistant of Under-
ground Mining Department at National Mining University.
Shapovalov Yakiv Andriyovych – Ph.D of Underground
Mining Department at National Mining University.
Astafiev Denys Olehovych – Ph.D of Underground Mining
Department at National Mining University.
Demchenko Yurii Ivanovych – associate professor of Un-
derground Mining Department at National Mining University.
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