Polyakov Yu.Ye. The deformation model of the wet coal-mass unloading

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Parent Category: Geo-Technical Mechanics, 2016

Category: Geo-Technical Mechanics, 2016, Issue 130

Geoteh. meh. 2016, 130, 125-136

THE DEFORMATION MODEL OF THE WET COAL-MASS UNLOADING
Polyakov Yu.Ye
IGTM NAS of Ukraine

UDC 539.32:622.831:622.234.5

Abstract.  In this article, a problem of unloading a coal seam, which is not in extremely stressed state, is considered. It is assumed that bearing capacity of the coal seam, even decreased due to water saturation, exceeds the rock pressure. It is further assumed that an unloading factor is the elastic modulus decrease with increased coal humidity. It is believed that the ξx, ξy, ξz deformations of the dry and wet coal are the same. When a wet area is small, a total load of the roof is taken by the dry coal, whose area is only slightly smaller than the original one. With the dry coal area decreasing, vertical stress therein increases and causes a significant additional increase of vertical deformation, which is transferred to the wet coal and causes additional stresses. Decreased strength of the wet coal is a main factor, which determines a rate of the buttock unloading from the rock pressure in the process of the rock hydraulic breaking.

Keywords: hydraulic power, elastic modulus, deformation unloading, coal humidity, strength limit, hydraulic breaking, humidification area.

REFERENCES

1. Pisarenko, G.S., Asarev, V.A., Kvitka A.L. (1986), Soprotivlenie Materialov [Strength of materials], Edition 5, Vyshcha shlola, Kiev, USSR.

2. Mineev, S.P., Potapenko, A.A., Mhvatvari, T.Ya., et al. (2013), Povyshenie effektivnosti gidrorykhleniya vybrosoopasnykh ugolnykh plastov [Improving the efficiency of hydro breaking on outburst coal seams], Shidnyi vydavnychiy dim, Donetsk, Ukraine.

3 Zberovskiy, V.V., Pazynich, A.V., Polyakov, Yu.E., Potapenko, A.A. and Angelovskiy, A.A. (2011), "The model of a limiting condition of the coal seam at the liquid injection", Scientific Collected Works of NMU, no. 36, vol. № 1, pp. 194-199.

4. Mineev, S.P. (2009), Svojstva gazonasyshhenogo uglya, [Properties of gas-saturated coal], Dnepropetrovsk, NMU, Ukraine. 

5. Zorin, A.N. (1978), Upravlenie dinamicheskimi proyavleniyami gornogo davleniya [Control of dynamic manifestations of rock pressure], Nedra, Moscow, USSR.

6. Vinogradov, V.V. (1989), Geomekhanika upravleniya sostoyaniem massiva vblizi gornykh vyrabotok [Geomechanics control of the array state near mine workings], Naukova Dumka, Kiev, USSR.

7. Kiyashko, Yu. I. and Dyakun, R. A. (2007), ―Legitimacies the destruction of the coal matter by the traditional definition of strength‖, Trudy XVII Mezhdunarodnoy Nauchnoy Sholy [Proceedings XVII of the International Scientific School], Deformirovanie i razrushenie materialov s defektami i dinamicheskie yavleniya v gornykh porodakh i vyrabotkakh [Deformation and destruction of materials with defects and dynamic phenomena in rocks and workings], Simferopol, Ukraine, pp. 134-136.

8. Sobolev, V.V., Polashov, A.S., Zberovskiy, V.V., Angelovskiy, A.A., Chugunkov, I.F. (2013), Monografiya, Sistema ugol-gaz v uglevodorodah ugolnogo genezisa [The monograph System coal-gas hydrocarbon genesis of coal], ART-PRESS, 246 p.

About the authors:

Polyakov Yuriy Evgenevich, Master of Sciences (M.S.), Junior Researcher in Department of Rock Breaking Problems, N.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine., This email address is being protected from spambots. You need JavaScript enabled to view it.

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