Krukovskyi O.P., Krukovska V.V., Khvorostian V.O. Method of roof-bolting support of mining with the periodic strength of anchor-rock structure

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 144

Geoteh. meh. 2019, 144, 53-61

https://doi.org/10.15407/geotm2019.144.053

Method of roof-bolting support of mining with the periodic strength of anchor-rock structure

¹Krukovskyi O.P., ¹Krukovska V.V., ¹Khvorostian V.O.

¹Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine

UDC 622.28.044

Language: Ukrainian

Abstract.

As practice shows, with an increase in the length of mine workings fixed by anchors, the energy of elastic deformations accumulates. The release of this energy leads to the dangerous destruction of the marginal rocks. In addition, at the intersection of areas with geological dislocations where the strength properties of rocks deteriorate, the bearing capacity of the anchor-rock structure is not sufficient to mine working in a steady state. Periodic reinforcement of the anchor-rock structure by installing additional anchors was proposed to eliminate these shortcomings. Additional anchors form element of the anchor-rock structure – a protective crosspiece.

In this paper, the main parameters of protective crosspieces are determined, which depend on the geological conditions, the function of mine working, its service life. Examples of anchoring schemes using protective crosspieces are given. The influence of inhomogeneous reinforcement of rocks along the mine working on its stability is established. For this purpose, a study of the stress-strain state of the rocks around an extended mine working with protective crosspieces of various power was performed. It is shown that with the use of crosspieces, the roof state improves – the value of the parameter characterizing the different components of the stress field decreases by 20-67 % at different sections of mine working. Protective crosspieces counteract the destruction of the marginal rocks due to the release of energy of elastic deformations that accumulate with an increase in the length of mine working. The use of element of the anchor-rock structure “crosspiece” with a frequency of 20-25 m blocks the negative impact of the factor influencing the length of the mine working, increasing the relative strength of rocks around the mine working.

For example, the anchoring of 585 gateway of the mine “Yubileinaya”, carried out in difficult mountain-geological conditions and stored for reuse, is considered. The mine working was supported in a reinforced anchoring scheme with powerful crosspieces. Geomechanical surveys during the period of making, working out the first and second wall showed that the gateway state in the process of building and use is steady. The method of anchoring with the use of protective crosspieces confirmed by the patent of Ukraine.

Keywords:

bolting, anchor-rock structure, the stress state of rocks, the stability of long mine working

References:

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About the authors:

Krukovskyi Olexandr Petrovych, Corresponding Member of NAS of Ukraine, Doctor of Technical Sciences (D. Sc), Deputy Director of the institute, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Krukovska Victoriya Victorivna, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in Department of Control of Dynamic Demonstrations of Rock Pressure, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Khvorostian Viktor Oleksiiovych, Junior Researcher of Department of Rocks Mechanics, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM, NASU), Dnipro, Ukraine.

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