Naslov
The impact of blasting on cave Velika Peća

Autori
Matić, Natalija ; Škrlec, Vinko ; Dobrilović, Mario

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Project SMART-KARST Event 4 : Karst sediments : 16th International karstological school "classical karst", karst sediments : guide book & abstracts / - Postojna : Karst Research Institute - ZRC SAZU, 2008

Skup
International karstological school "classical karst", karst sediments (16 ; 2008)

Mjesto i datum
Postojna, Slovenija, 16.06.2008. - 21.06.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
limestones; blasting; seismological impacts of blasting; deformations; archeological site

Sažetak
Cave Velika Peća is situated near Grabovac village, which is positioned in the background of mountain Biokovo on the part of Šestanovac-Zagvozd motorway. The cave is a natural speleological object which is an important archeological site too. Velika Peća consists of limestones, upper Cretaceous. On the part of motorway route above the cave test blasting was made with the purpose of evaluating the possibility of damage beginning in limestones in the cave and measuring seismological impacts of blasting with calculation of permitted mass of explosive charge. The route of Šestanovac-Zagvozd motorway which is under construction passes close to the cave. The technology of excavation includes drilling and blasting. The nearest distance of final slope from the cave is 10 m. The impact blasting and propose drilling blasting parametars for the future were determinated towards execute measuring of oscillation velocities on the occasion of test blasting. On the occasion of blasting oscillation velocities of the ground were measured with transport seismographs and deformations with LVDT sensors. Six points of monitoring for a test blasting field MP-1 were placed and eight points for a test blasting field MP-2. Mass of the explosive charge of blasting field MP-1 was 25, 5 kg and for a MP-2 36, 0 kg with the sequence of milisecond delay blasting. During the both blasting measuring oscillation velocities of the ground in points of monitoring in the cave were under the permitted standard DIN 4150. LVDT sensors did not record any deformations on the measured points on the limestones of Cave Velika Peća. Intensity of shaking caused by blasting was determinated by measuring the oscillation velocities of the ground in points of monitoring. Permitted oscillation velocities of the ground for the cave is middle value of a permission velocities between the historical monument and the apartament vper=1, 0 cm/s. Mass of explosive charge was determined according to permitted oscillation velocities of the ground vper=1, 0 cm/s for a continuation of blasting works on the part of motorway route above the cave. Applied standard is DIN 4150 with frontier permission of oscillation velocities from vper=1, 0 cm/s.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

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