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Effect of water
saturation of coal samples with a central hole for their elasticity module
under axle compression along the axis axle
Mineev S.P.1*,
Usov O.A.1, Poliakov
Yu. E.1, Bodnar A.A.2, Ukolova T. M. 1
1Institute of
Geotechnical Mechanics named by N. Poljakov of
National Academy of Sciences of Ukraine, 49005, Dnipro, Simferopolska Str., 2a, Ukraine,
2PJSC “Donetsksteel “Irond and steel
works” Pokrovsk, st. Shakhtarov, 1 Ukraine
*Corresponding
author: e-mail: sergmineev@gmail.com
Physical and technical
problems of mining production, 2020, (22), 19-30.
https://doi.org/10.37101/ftpgp22.01.002
full
text (pdf)
ABSTRACT
Goal. Optimization of
hydraulic loosening technology to reduce the outburst hazard of coal seams
at great depths by using the effect of their deformation unloading. The
research objectives are to obtain on modern equipment deformation curves
during water saturation of coal samples according to a scheme similar to
the natural conditions - through a hole drilled in the center
of the sample and assess the effect of moisture on the elastic modulus and
the degree of unloading of the formation from rock pressure.
Methodology. Comparison of
experimental deformation curves of uniaxial compression of a coal sample
with a central hole at various values of its moisture content. The moisture
content of the sample was changed by injecting
water into the central hole of the sample.
Results. The deformation
curve has the form of a one-term power dependence. This dependence has a
concave character and differs markedly from Hooke's law. With the same deformation, an increase in
humidity by 2% reduces stress - by 3.2 times, and the elastic modulus
decreases by 2.5 times. These data may become some basis for refining the
parameters of the forecast of outburst hazard during mining operations.
Scientific
novelty. It was found for the first time that a
change in the moisture content of a sample changes the curvature of its
deformation curve. An increase in humidity increases the concavity of the
deformation curve - the greatest increase in deformation is
observed at low stresses.
Practical
significance. The results obtained will reduce the requirements for the hydraulic
treatment pressure of outburst coal seams during preparatory workings at
great depths. Due to this, the cost and mass-dimensional characteristics of
high pressure pumps are reduced and the
productivity of tunneling works is increased.
Keywords: deformation
curve, stress, humidity, compliance
REFERENCES
1. Mineyev S.P.
(2016). Prognoz i sposoby bor'by s gazodinamicheskimi
yavleniyami na shakhtakh Ukrainy. Mariupol': Vostochnyy izdatel'skiy
dom, 258s.
2. Koptikov V.P., Bokiy B.V., Mineyev S.P., Yuzhanin I.A., &Nikiforov
A.V. (2016). Sovershenstvovaniye sposobov i sredstv bezopasnoy razrabotki ugol'nykh plastov, sklonnykh k gazodinamicheskim
yavleniyam. Donetsk: Promin', 480 s.
3. Mineyev S.P., Potapenko A.A., Mkhatvari
T.YA., Nikiforov A.V., Kuzyara
S.V., &Timofeyev E.I. (2013). Povysheniye effektivnosti gidrorykhleniya vybrosoopasnykh
ugol'nykh plastov. Donetsk: Skhídniy
vidavnichiy dím.
216s.
4. http://fccland.ru/gornye-udary/3103- html
5. Chernov O.I., Rozantsev Ye.S. (1975). Podgotovka shakhtnykh poley s gazovybrosoopasnymi plastami. Moskva: Nedra, 287
s.
6. Vasilyev, D., Polyakov, Y., &Potapenko,
A. (2013). Method of calculation of the minimum pressure of hydro breaking
of the coal layer. Mining of Mineral Deposits. – Leiden, The Netherlands:
CRC Press/Balkema, 177-179,
7. Usov O.A., &Polyakov YU.Ye. (2016). Faktory vliyaniya gidroobrabotki uglya na razgruzku
prizaboynoy chasti massiva. Geotekhnicheskaya mekhanika, (129), 166-172
8. Polyakov YU.Ye. (2016). Deformatsionnaya
model' razgruzki
uvlazhnennogo ugol'nogo massiva. Geotekhnicheskaya mekhanika,
(130), 125-136
9. Usov O.A. (2015).
Otsenka sootvetstviya lineynogo zakona fil'tratsii vody real'noy dinamike izmeneniya yeye davleniya pri nagnetanii v ugol'nyye plasty. Geotekhnicheskaya mekhanika,
(120), 93-101
10. Usov
O.A., Mineyev S.P., Dyakun
R.A., Polyakov YU.Ye., Trokhimets N.YA., Yanzhula
A.S., Rud' V.P. (2017). Laboratornyye issledovaniya dvumernoy fil'tratsii vody cherez ugol'nyye obraztsy. Forum gírnikív
- 2017: materíali mízhnar.
konf.,
4-7 zhovtnya 2017r., m. Dnípro.
– D.: Natsíonal'niy gírnichiy uníversitet,
s. 298-307
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