Sheyko A.V. Geomechanical principles for designing crosscuts in steep sedimentary rock mass
- Details
- Parent Category: Geo-Technical Mechanics, 2018
- Category: Geo-Technical Mechanics, 2018, Issue 143
Geoteh. meh., 2018, 143, 70-76
https://doi.org/10.15407/geotm2018.143.070
GEOMECHANICAL PRINCIPLES FOR DESIGNING CROSSCUTS IN STEEP SEDIMENTARY ROCK MASS
1Sheyko A.V.
1Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine
UDC 622.274.016.33.001.2:552.5
Languige: English
Annotation.
In the context of mines with steep seams, it is of great importance to solve a problem of accelerating the rates of new horizon preparation by reducing amount of mining operations and applying advanced supports in the capital crosscuts (roof-bolting, shotcreting, and combined supports). In order to substantiate area of the advanced support application in the crosscuts, an integrated mine research was performed, industry-based experiments were carried out, and typical project of consolidating the mine roadways with the help of the shotcrete supports was developed. Analysis of rock pressure manifestations included the following: survey of the mine roadways and over-support areas; mounting of line and deep gauge stations; rock fracture characterization by the cores drilled out from the rock mass; statistical data processing and substantiation of the support parameters by economic-probabilistic methods; development of practical recommendations; and industry-based experiments for verifying the solutions obtained. The following regularities were determined experimentally, which concerned behaviour of rock pressure parameters in the crosscuts driven in the steep stratified rock mass: rock displacements within the contour and in the depth of zone with non-elastic deformations; thicknesses of broken and displaced rocks; inrush heights in the rocks broken by blast and fallen on the bearing support. A new phenomenon was identified: disintegration of rock mass being stable in the contour of the mine roadway cavity. It was determined that rock inrush from area between the anchors was a random value with density distributed by the Laplace law; signs of extremely unstable rocks were defined. Range of use and parameters of the roof-bolting, shotcreting, metal frame, and combined supports were substantiated by the economic-probabilistic approach. The performed research became a basis for development of a standard project for the mine working consolidation by the advanced supports; the supports were tested at industrial scale; and schemes of support setting in the crosscuts were reviewed. The research makes it possible to reduce by 30% expenditures connected with a new mine horizon opening.
Keywords: geo-meсhaniсs, design, crosscut, steep rock massive, sedimentary rocks
References
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About the author
Sheyko Anatoliy Vasilyovych, Master of Science, Chief Technologist in Department of Underground Coal Mining, Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine, (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.