Utjecaj fizikalno-mehaničkih svojstava stijena na učinkovitost udarno-rotacijskog bušenja

master's thesis

• Title: Utjecaj fizikalno-mehaničkih svojstava stijena na učinkovitost udarno-rotacijskog bušenja : diplomski rad
• Title (english): Influence of physico-mechanical characteristics of rocks on efficiency of rotary percussion drilling : master’s thesis
• Author: Vjekoslav Herceg
• Mentor: Trpimir Kujundžić (mentor)
• Committee member: Trpimir Kujundžić
• Committee member: Mario Dobrilović
• Committee member: Petar Hrženjak
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Mining and Geotechnical Engineering); Zagreb
• Defense date and country: 2015-07-17, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Mining

Abstract

Na površinskim kopovima „Hruškovec“ i “Straža-Vinceli” obavljena su terenska mjerenja efektivne brzine bušenja minskih bušotina, površinskim bušilicama. Uz mjerenje vremena i dubine prodiranja bušaćeg alata, praćeni su i bilježeni tlakovi hidrauličnog ulja i komprimiranog zraka na stroju za bušenje, kao i izmjena litoloških članova tijekom bušenja. Na eksploatacijskom polju „Hruškovec“ izvedeno je mjerenje tijekom bušenja u dijabazu, bušilicom Atlas Copco ROC F6, koja kao radni alat koristi dubinski bušaći čekić. Mjerenje brzine bušenja u vapnencu izvedeno je na eksploatacijskom polju “Straža-Vinceli”, bušilicom Atlas Copco ROC D7 koja kao radni alat koristi vanjski, hidraulički bušaći čekić. Izmjerene brzine bušenja uspoređene su sa teoretskim izračunima brzine bušenja. Detaljno je opisan razvoj i današnje mogućnosti strojeva koji se najčešće koriste za bušenje minskih bušotina u kamenolomima. Obrađeni su i prikazani rezultati jedne studije koji se temelje na ispitivanju osam različitih vrsta stijena na površinskim kopovima i cestovnim trasama. U rezultatima su prikazane korelacije između brzine bušenja i fizikalno mehaničkih svojstava stijena. Jednoosna tlačna čvrstoća, Schmidtova tvrdoća, vlačna čvrstoća (brazilski test) i čvrstoća kod opterećenja u toĉki (PLT – test) svojstva su stijena koja su pokazala najveći utjecaj na brzinu prodiranja bušaćeg alata. Utvrđen je također slabiji utjecaj modula elastičnosti i gustoće, dok brzina širenja P-valova nije iskazala nikakav utjecaj na brzinu bušenja.

Abstract (english)

Abstract: The penetration rate measurements with the surface drills were carried out on the open pits „Hruškovec“ and „Straţa-Vinceli“. Beside measuring time and depth of the drilling tool penetration, the drilling machine hydraulic oil and compresed air pressure were monitored and recorded, as well as changes in lithology. On the exploitation field „Hruškovec“ the measurements were carried out during the drilling in the diabase with the Atlas Copco ROC F6 drilling machine, which as a working tool uses (DTH) down the hole drilling hammer. Drilling speed measurements in limestone were carried out on the exploitation field „Straţa-Vinceli” with the Atlas Copco ROC D7 drilling machine which as a working tool uses top hammer. The measurement results where compared against the theoretical calculations. Furthermore, the detailed development and capabilities of today's drilling machines are described. Also, in this thesis the results of a study which was based on an examination of eight different types of rocks are shown and analyzed. The results have shown the correlation between the penetration rate and the physical mechanical properties of the rocks. Uniaxial compressive strength, Schmidt hardness, tensile strength (Brazilian test) and point load strength showed a strong influence on the rate of penetration of the drilling tool, while lower influence was found between the penetration rate and the modulus of elasticity and the natural density. Influence of the P-wave spreading speed were not found.

• Keywords: udarno rotacijsko bušenje; fizikalno mehaničke karakteristike stijena; učinkovitost bušenja
• Keywords (english): rotary percussion drilling; physico-mechanical characteristics of rock; drilling efficiency
• Language: croatian
• URN:NBN: urn:nbn:hr:169:079620
• Study programme: Title: Mining; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka rudarstva (magistar/magistra inženjer/inženjerka rudarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2015-12-11 14:44:34