Index Geophysics

eng STRESSES AND DEFORMABILITY OF ROCK MASS UPON OPEN PIT EXPLOITATION OF DIMENSION STONE

hrv NAPREZANJA I DEFORMACIJA STIJENSKE MASE PRI POVRŠINSKOJ EKSPLOATACIJI KAMENIH BLOKOVA

eng The appearance of increased stresses and deformability of rock mass in the quarry of Zečevo (exploitation field of Selca – island of Brač) has caused a considerable decrease of usability of mineral raw materials, which put into question the survival of the pit. Therefore the research and measurements of the state of stresses and deformability of rock mass within the pit were carried out. Besides detailed laboratory testings (testings on small samples) performed were trial in-situ testings on large samples including the corresponding numerical analyses. The exploitation of dimension stone by sowing regularly shaped rectangular blocks has been proved to be appropriate for in-situ testing of bending strength. The paper presents the results of carried out laboratory testings, in-situ testings of bending strength including measuring of deformations after sowing cuts and numerical analyses by which the possible range of horizontal stresses was determined. Since for the case of massive rocks, for which the continuum concept is applied, there are no specifically defined methods of corrections, presented is a possible relation for correction of input size values based on the carried out laboratory and in-situ testings.

hrv Pojava pojačanih naprezanja i deformacija stijenske mase u kamenolomu Zečevo (eksploatacijsko polje Selca - Brač) prouzročila je izrazito smanjenje iskoristivosti mineralne sirovine što je dovelo u pitanje opstanak kopa. Zbog toga je provedeno istraživanje i mjerenje stanja naprezanja i deformabilnosti stijenske mase unutar ležišta. Osim detaljnih laboratorijskih ispitivanja (ispitivanja na malim uzorcima), provedena su i probna istražna in-situ ispitivanja na velikim uzorcima, te odgovarajuće numeričke analize. Eksploatacija arhitektonsko-građevnog kamena s piljenjem pravilno oblikovanih pravokutnih blokova pokazala se pogodnom za in-situ ispitivanje čvrstoće na savijanje. U radu se prikazuju rezultati provedenih laboratorijskih ispitivanja, in-situ ispitivanja čvrstoće na savijanje uz mjerenje deformacija nakon izrade rezova, te numeričke analize pomoću kojih je utvrđen mogući raspon horizontalnih naprezanja. Budući da za slučaj masivnih stijena, za koje se primjenjuje koncepcija kontinuuma u praksi ne postoje posebno razrađene metode korekcija, prikazana je moguća relacija za korekciju vrijednosti ulaznih veličina, koja se temelji na provedenim laboratorijskim i in-situ ispitivanjima.

Dunda, Siniša

Hrženjak, Petar

Kujundžić, Trpimir

eng dimension stone;quarrying;stresses

hrv arhitektonsko-građevni kamen;eksploatacija;naprezanja

Faculty of Mining, Geology and Petroleum Engineering University of Zagreb

2003

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https://hrcak.srce.hr/13388

eng https://hrcak.srce.hr/file/20516

Rudarsko-geološko-naftni zbornik

ISSN 1849-0409 (Online)

Volume 15

Issue 1

eng

info:eu-repo/semantics/openAccess

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