Experimental-industrial verification of maintenance method using rigid constructions with countervailing cavities in the mine “Scheglovskaya-Glubokaya”

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 Authors:

N.N. Kasyan, Dr. Sci.(Tech.), Professor, State Higher Educational Institution"Donetsk National Technical University", Head of the Department of Mineral Deposits Development, Donetsk, Ukraine

V.N. Mokrienko, State Higher Educational Institution “Donetsk National Technical University”, postgraduate student, Donetsk, Ukraine

I.G. Sakhno, Cand. Sci. (Tech.), Associate Professor, State Higher Educational Institution “Donetsk National Technical University”, Donetsk, Ukraine

Abstract:

Purpose. To study features of the displacement of enclosing strata for pilot testing of a new method of protection in the mine “Shcheglovskaya-glubokaya”.

Methodology. The methodological basis of the work is a comprehensive approach that includes a series of preliminary laboratory tests on physical models using the method of equivalent materials. A new method of ensuring the stability of development working through the use of rigid constructions with countervailing cavities. During the industrial test the method of field observations, proposed by members of Donetsk National Technical University has been used for recording of the spatial displacement of the tunnel contour in time. On the base of registered data the graphs of shifting of floor and ceiling of the tunnel were constructed for workings protected by means of usual methods and those where the new protection method had been tested, taking into account the distance to the stope. We have analyzed the rate of displacement of rocks enclosing the working, and constructed the cross sections of the workings in the reference grid at the distance of 50, 100 and 150 m from the stope. It is possible to establish the relative value of reduction of the displacement floor and ceiling of the tunnel protected by means of the proposed method in comparison with old methods. In the course of industrial tests the destruction of semi-blocks of support structures appeared. Therefore, it was held the next stage of research on measuring the pressure on support structures. Also, at this stage the material strength certificate for semi-blocks was drawn up. As a result, conclusions about ways of improvement of the proposed method for implementation in the mine “Shcheglovskaya-glubokaya” have been made. The solution consists in using more durable material for semi-blocks.

Findings. In general, industrial tests were completed with positive results. Since the displacement of rocks of the floor in the tested section reduced by 30–40% compared with the control section and the displacement of the ceiling increased by 7%. The increase of ceiling displacement was caused by the insufficient strength of the material of semi-blocks.

Originality. Provided that the ratio of the width of the cavity and the width of the protective structures is 1:1 and the ratio of the depth protective structure to its width is 2:1 the swelling in the working and the provocation of blowup in the fixing space were reduced.

Practical value. An addition to the certificate on control and fixing the roof has been made and this allowed reducing the displacement of floor by 30–40%, with the expected economic effect of 238 UAH / m.

 

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