Kalinchenko O. V., Stupnik М.I. Investigation and modeling of stress-strain state of the tent and arched crowns

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Parent Category: Geo-Technical Mechanics, 2018

Category: Geo-Technical Mechanics, 2018, Issue 139

Geoteh. meh. 2018,139, 70-77

DOI: https://doi.org/10.15407/geotm2018.02.070

iNVESTIGATION AND MODELING OF STRESS-STRAIN STATE OF THE TENT AND ARCHED CROWNS

¹Kalinchenko O. V., ¹Stupnik М.I.

¹State Higher Educational Institution «Kryvyi Rih National University»

UDC622.274:622.83

Language: Ukrainian

Abstract.

The iron-stones of the Kryvoy Rog  field are obtained over 130 years. In the process of their booty by an underground method different classes of the systems of exploitation are used both with bringing down of ore and containing breeds and with the opened cleansing space. In all case in mine space forms cleansing or compensative chambers, stability  of which largely depends on stability of their roof. Especially the problem of stability of baring increased at working off deep horizons of the mines  characterized by considerable growth of mine pressure.

The paper studies and presents results of modeling of stress-strain state of the tent and arched crowns. The accepted values of rock pressure corresponded to mining and technical conditions of Kryvbas deposits at the depths of over 1200 m. Calculation of stresses and strains was performed by finite element method on the basis of Ansys 16.0.

Results of the research demonstrate that under influence of rock pressure crowns inversion of principal stresses occurs. The modified stress-strain state with decreased compressive stresses is formed in the crown massif; absence of tension stresses is diagnosed. The obtained results prove that such types of crown shapes are proportionally more stable in comparison with classical horizontal exposures.   

The research reveals that in order to provide maximum stability under high rock pressure at mining rich iron ores by the room-and-pillar systems at great depths the key requirement is transition to the tent and arched shapes of crowns.

It is proved that integrated index of maximum stresses in the floor pillars varies from -10 МPа to + 32 МPа at depths over 1200 m, depends on the crown shape and is in the polynomial dependence on the mining depth, iron ore hardness, slope angle and relative radius of the crown curvature. With the tent-shaped crowns, the index gains its minimal values allowing stable exposures of stope crowns at the depths of up to 2000 m.

Key words: stress-strain state, rock massif, crown, strains, stresses.

References:

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About the authors:

Kalinchenko Olena Vsevolodіvna, Candidate ofEconomics, Associate Professor, Associate Professor in the Department of Underground Mining of Mineral Deposits, State Higher Educational Institution «Kryvyi Rih National University» (SHEI «KNU»), Kryvyi Rih, Ukraina, This email address is being protected from spambots. You need JavaScript enabled to view it.

Stupnik Мykola Ivanovych, Doctor of Technical Sciences (D. Sc.), Professor, Rector, State Higher Educational Institution «Kryvyi Rih National University» (SHEI «KNU»), Kryvyi Rih, Ukraine

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