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Research of the stress condition of massif around mine working with bolting at the drive working by blast-hole drilling

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Category: Mining

Last Updated on 19 February 2013

Published on 16 November 2012

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Authors:

A.P. Krukovskiy, Cand. Sci. (Tech.), Senior Research Fellow, N.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Senior Research Fellow, Dnepropetrovsk, Ukraine

V.V. Krukovskaya, Cand. Sci. (Tech.), Senior Research Fellow, N.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Senior Research Fellow, Dnepropetrovsk, Ukraine

Abstract:

Foreign and Ukrainian experience of application of modern roof bolting technology during mining shows that it provides stability and reliability of tunnels for continuous service in different use environment. One of the requirements of roof bolting installation is mounting it in loaded by rock pressure enclosing rock massif in immediate vicinity of coal face. It allows best preservation of natural monolithic state of marginal rock due to involvement of installed roof bolting into rock pressure resistance work. When the excavation is carried by means of mining combine, it is easy to install another row of anchors in time because destruction of the roof rocks is minimal and work gives the necessary effect. But in case of blast-hole drilling, excavation work breaks natural monolithic rock. Determination of the stress field around the coal face before, during and after explosion of blast-hole charges will allow estimation of the impact of the explosion on the stability of roof bolting and its ability to keep roof rocks in an undisturbed state. Thus the purpose of the research was the study of state the roof rocks fixed by the roof bolting in en excavation made by method of blast-hole drilling by means of mathematical modeling and mining experiments and observations data analysis. The article presents the results of numerical modeling of geomechanical and filtration processes around the mine working fixed by the roof bolting during explosion of blast-hole charges. The state of unfixed roof over the coal face with different delays of roof bolting installation from the coal face was done. It is shown, that roof bolting prevents rock foliation and destruction of the roof rocks even in en excavation made by method of blast-hole drilling.

References:

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Bulat, A.F. and Vinogradov, V.V. (2002), Oporno-ankernoe kreplenie gornykh vyrabotok ugolnykh shakht [Roof Bolting in Mine Workings of Coal Mines], Institute of Geotechnical Mechanics NAS of Ukraine, Dnepropetrovsk, Ukraine, 372 p.

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“System of providing reliable and safe operation in the mine workings by means of roof bolting. The general technical requirements”, (2008), Ministry of coal industry of Ukraine, Kyiv, Ukraine, 83 p.

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Borovikov, V.A. and Vanyagin, I.F. (1990), Modelirovanie deystvia vzryva ghb hfpheitybb gornykh porod [Modeling of Blast Action During Destruction of Rocks], Nedra, Moscow, Russia, 231 p.

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