Index Geophysics

eng WEATHERING PROCESS IN EOCENE FLYSCH IN REGION OF SPLIT (CROATIA)

hrv PROCES TROŠENJA U EOCENSKIM FLIŠNIM NASLAGAMA PODRUČJA SPLITA (HRVATSKA)

eng The Eocene flysh in the region of Split (Dalmatia, Croatia) is char¬acterized by the presence of layers with different characteristics. It mainly includes thin-layered marls, clayey marls, calcareous marls, clastic lay¬ered limestones, calcarenites and breccias. Those parts that can be de¬scribed as the soft rocks or hard clays by the mechanical means, exposed to weathering reduce the durability within "an engineering time scale". The paper deals with the factors that influence the weathering process. The analyzed weathering is a combination of processes acting simulta¬neously. Most of these processes depend on the change of the water con¬tent, thus the weathering process mainly develops when a material is subjected to the wetting-drying process, On the base of these results form of degradation process is modeled. The weathering process can be main¬ly described as physical weathering combined with chemical weathering on the free surfaces and on the cracks walls. Erosion as a result of weath¬ering, is the dominant geomorphic process on analyzed flysch terrain. According to the analysis, as the most appropriate due to the characteris¬tics the tests are chosen as index properties. Some of these tests are modified in order to adapt them to the determined characteristics of ma¬terials from flysch layers. The correlations between the measured values are used as the basis for the classification proposal of the analyzed mate¬rial, according to its resistance to weathering processes. Roughly, three main groups of samples are recognizable: the first one with carbonate content more then 90% is not weathered at the engineers time scale; the second group with carbonate content from 75% to 90% include samples susceptible to weathering in engineers time scale; the third group with carbonate content less then 75% include samples in which the weather¬ing occurs immediately after the exposition to the weathering factors.

hrv Eocenske flišne naslage područja Splita (Dalmacija, Hrvatska) kara¬kterizira prisutnost slojeva različitih svojstava. Naslage uglavnom sadržavaju tanko uslojene lapore, glinovile lapore, kalcitične lapore, klasični uslojeni vapnenac, kalkarenite i breče. Oni slojevi koji se po mehaničkim svojstvima mogu opisati kao mekane stijene ili tvrda tla, imaju svojstvo da izloženi procesima trošenja značajno gube trajnost i to unutar "inženjerskog razdoblja vremena". U ovom radu razmatraju se čimbenici koji utječu na proces trošenja. Analizirano trošenje je kom¬binacija procesa koji djeluju istodobno. Većina tih procesa ovisi o promje¬ni vlažnosti, te se trošenje uglavnom razvija kada je materijal podvrgnut sušenju i vlaženju. Na osnovi rezultata ispitivanja utjecaja sušenja i vlaženja modeliran je proces degradacije svojstava. Trošenje može ug¬lavnom biti opisano kao fizičko a usko je povezano s kemijskim i ug¬lavnom se odvija na slobodnim površinama materijala i na zidovima pukotina u njemu. Erozija kao rezultat trošenja je dominantni geomor-fološki proces na razmatranim flišnim naslagama. Na osnovi provedene analize odabrani su pokusi koji kao indeksni pokazatelji najbolje opisu¬ju razmatrani proces trošenja. Neki od pokusa su dijelom modificirani kako bi se što bolje prilagodili ispitivanju materijala iz flišne naslage, Uočene korelacije između mjerenih rezultata poslužile su za izradu pri¬jedloga klasifikacije predmetnih materijala s obzirom na njihovu podložnost trošenju. U osnovi, mogu se prepoznati tri glavne grupe uzora¬ka: uzorci koji sadrže više od 90% karbonata nisu podložni trošenju unutar inženjerskog razdoblja vremena; druga grupa su uzorci koji sadrže od 75% do 90% karbonata osjetljivi su na trošenje unutar inženjerskog razdoblja vremena; treću grupu čine uzorci sa manje od 75% karbonata u kojima se proces trošenja razvija neposredno nakon izlaganja faktori¬ma trošenja.

Miščević, Predrag

Roje-Bonacci, Tanja

eng weathering;flysch;classification

hrv trošenje;fliš;klasifikacija

Faculty of Mining, Geology and Petroleum Engineering University of Zagreb

2001

text

info:eu-repo/semantics/article

info:eu-repo/semantics/publishedVersion

application/pdf

https://hrcak.srce.hr/13415

eng https://hrcak.srce.hr/file/20567

Rudarsko-geološko-naftni zbornik

ISSN 1849-0409 (Online)

Volume 13

Issue 1

eng

info:eu-repo/semantics/openAccess

The author and publisher rights are visible during the submission process, and ethical codex is available at http://hrcak.srce.hr/ojs/index.php/rgn/about/editorialPolicies#custom-0 .

The Bulletin is open access (OA, green model, CC-BY) journal what means that electronic versions of articles are accessible to readers, without any fees or registration.When use, please refer to Creative Commons license (BY type, http://creativecommons.org/licenses/by/4.0/ ).

Publisher copyright policies & self-archiving is also described at Sherpa organisation web (RoMEO service) based at the University of Nottingham (http://www.sherpa.ac.uk/romeo/pub/2374/).

All volumes of the Bulletin (from 1989) are available at Hrčak journal pages (http://hrcak.srce.hr/rgn-zbornik?lang=en).