Науковий вісник НГУ

Estimation of geomechanical parameters of the “pair workings-pillar-working face” system

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Category: Mining

Last Updated on 11 July 2014

Published on 11 May 2014

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Authors:

A.N. Shashenko, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Head of the Department of Construction and Geomechanics, Vice-Rector for International Relations, Dnipropetrovsk, Ukraine.

G.G. Storchak, State Higher Educational Institution “National Mining University”, Assistant Lecturer of the Department of Construction and Geomechanics, Dnipropetrovsk, Ukraine.

A.O. Logunova, State Higher Educational Institution “National Mining University”, Postgraduate Student of the Department of Construction and Geomechanics, Dnipropetrovsk, Ukraine.

A.Yu. Korol, Deputy Director on Economic Affairs, VP “Shakhta “Dimitrova” of the GP “Krasnoarmeyskugol”, Dimitrov, Donetsk oblast, Ukraine.

Abstract:

Purpose. To substantiate the rational parameters of the stability assuring measures provided for a skin-to-skin development heading being driven towards advancing mining face through determining the extension of breakage zone around the longwall, and the support pressure load by using the method of finite elements.

Methodology. The geomechanical conditions of rock massif and cross impact of the complex of development workings and mining have been considered based on the method of finite elements in three-dimension and flat task settings.

Findings. The solutions of the three-dimension and flat elastic-plastic problems allow to define the indices of stress concentration, the extent of breakage zone around working complex and support pressure load. This allows choosing required elements of the support.

Originality. It was determined that the width of the pillar between pair workings being equal to 3 meters is sufficient to provide required stability in regards to mining and geological conditions of the mine Dobropolskaya. It was determined that compression stress in the pillar from the side of coal-cutting working under the conditions of advancing face heading behind longwall opening reaches the value of σ_у=2,5γН.

Practical value. The results of the research allowed us to determine optimal parameters for safety assuring measures provided for the air heading of the eighth northern longwall of the seam m₅^1вon the level of450 meters had been driven skin-to-skin in counter motion to the seventh northern conveyer heading. This allowed to provide the stability of this complex of development workings; and to apply the experience obtained for the conditions of PSP “ShU “Dobropolskoye”.

References:

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