Klimenko D.V. DETERMINATION OF THE OSCILLATIONAL LOAD PARAMETERS, IN TERMS OF THE CRACK INITIATION IN THE ROCK

Details
Parent Category: Geo-Technical Mechanics, 2016
Category: Geo-Technical Mechanics, 2016, Issue 128

DETERMINATION OF THE OSCILLATIONAL LOAD PARAMETERS, IN TERMS OF THE CRACK INITIATION IN THE ROCK

Klimenko D.V.

Klimenko D.V., M.S (Tech)

(SHEI «NMU»)

Abstract. One of the greatest dangers is the sudden catastrophically rapid destruction of the rock during the mining minerals. As a rule, such a phenomenon occurs when different mining mechanisms work in mine. It is the source of elastic oscillations in the rock mass. The rock mass failure can be interpreted as a process of crack development. Thus, the rock is influenced by the quasistatic stress and the changing oscillational loading. Registered acoustic oscillations are analyzed in accordance with regulatory seismoacoustic methods in the rock. However, the used criterion for predicting dynamic phenomena is the local nature and is formulated according to the results of preliminary observations under specific conditions. Since the dynamic phenomena are associated with the development of cracks in the rock mass, it is necessary to define fairly general conditions under which the oscillational load generates the rock failure with certain structural joints (cracks). Early we got the generalized criterion of a crack initiation. The criterion takes into account the effect of both quasistatic and oscillational loadings. But the parameters regions for which the oscillation load can lead to the crack initiation have not been investigated. The determination of such regions is most important for development of an acoustic prediction of dynamic phenomena.

Keywords. Crack, crack initiation, amplitude, crack resistance, critical crack length.

 

REFERENCES

  1. Ministry of Coal Industry of Ukraine (2005), SOU 10.100174088.011-2005 Pravyla vedennya girnychykh rodit na plastakh skhylnykh do gazodynamichnykh yavyshch [SOU 10.100174088.011-2005. Rules of mining in seams prone to gas-dynamic phenomena], Kyiv, UA.
  2. Golovko, Yu., Sdvyzhkova, E. and Klymenko, D. (2017), «The generalized criterion of a crack initiation in terms of oscillations in stress strain rock mass», Bulletin М. Ostrogradsky KrNU, no.1.
  3. Morozov, N.F. and Y.V. Petrov (2000), «Dynamics of fracture», Springer-Verlag., Berlin-Heidelberg-New York - pp. 98
  4. Nikolaevsky, V. (1999), Geodinamika i fluidodinamika  [Geodynamics and fluid dynamics], Nedra, Moscow, RU.
  5. Shashenko, A., Mayherchyk, Т. And Sdvyzhkova, Ye. (2005), Geomekhanicheskiye processy v porodnykh massivakh [Geodynamic processes in rock massifs]. NMU, Dnepropetrovsk, UA.
  6. Marcote, A., Mavko, G. and Prasad, M. (2010), «Dynamic elastic properties of coal», Geophysics, Vol. 75, no. 6. pp. E227 - E234.
  7. Chebotarev, P.N. (2012), «The establishment of correlations crack resistance coal with indicators of its strength», News TSU. Technical sciences,- no. 9, pp. 88-92.
  8. Sdvyzhkova, O., Golovko, Yu., Dubytska, M. and Klymenko, D. (2016), «Studying a crack initiation in terms of elastic oscillations in stress strain rock mass». Mining of Mineral Deposits, Vol.10, no. 2, pp. 72-77 
  9. Gunter, N.M. and Kuzmin, R.O. (2003), Sbornik zadach po vysshey matematike [Collection of problems in higher mathematics], Lan, Moscow, RU.

_________________________________

About the author

Klimenko Dina Vladimirovna, Master of Science, Senior Lecturer of the Higher Mathematics Department, State Higher Educational Institution “National Mining University” (SHEI “NMU”), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.