Науковий вісник НГУ

Determination of the displacement of rock mass nearby the dismantling chamber under effect of plow longwall

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Category: Geotechnical and mining mechanical engineering, machine building

Last Updated on 22 June 2016

Published on 22 June 2016

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Authors:

O.O.Sdvyzhkova, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Dnipropetrovsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..ua;This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

D.V.Babets, Cand. Sci. (Tech.), Assoc. Prof., State Higher Educational Institution “National Mining University”, Dnipropetrovsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..ua;This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

K.V.Kravchenko, Cand. Sci. (Tech.), State Higher Educational Institution “National Mining University”, Dnipropetrovsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..ua;This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

A.V.Smirnov, Cand. Sci. (Polit.), DTEK Company, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Determining the increase of rock displacements nearby a pre-constructed dismantling chamber while a plow longwall approaching. Additional goal is to develop a technique for estimating the pressure created by failed rocks at different stages of mining.

Methodology. Displacements around a pre-constructed dismantling chamber were studied in situ using tell-tale stations. Numerical simulation was carried out to determine the rock stress-strain state applying a plastic deformation model. The numerical procedure of strain accumulation was implemented at the sequential change of mined-out space while modeling. Areas of broken rocks (failure zones)were determined according to Hoek-Brown strength criterion. Nu­me­rical simulation was carried out concerning different geological conditions and excavation dimensions. The non­linear estimation method combining with multiple regression and variance analysis were used to build general regularities.

Findings. The multi-variant calculations of stress-strain state change were carried out for different values of rock strength, coal seam thickness, mining depth and dismantling chamber size as well. The results were generalized for di­ffe­rent geological conditions. The failure zone height and excavation contour displacements are represented as a function of factors mentioned above.

Originality. New regularities were obtained relatively the increase of rock displacements nearby a dismantling chamber. A failure zone spreading was shown depending on rock properties. Convenient techniques were developed to cal­culate constitutive geomechanical characteristics and provide an adequate support design for dismantling chamber under various mining and geological conditions.

Practical value. The set of formulas derived with regression method allows determining the main geomechanical cha­ra­cteristics and gives a simple technique to design the support of dismantling chamber. This is a background for developing the general standards related to dismantling chamber designing under Western Donbass geological conditions.

Список літератури / References:

1. Sdvyzhkova, O.O., Babets, D.V. and Smirnov, A.V., 2014. Support loading of assembly chamber in terms of Western Donbas plough longwall. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no .5, pp. 26–32.

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Правилатехнічноїексплуатаціївугільнихшахт:СОУ 10.1-00185790-002-2005.

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