Mineraloška i geotehnička svojstva gornjomiocenskih sedimenata s klizišta Perjavica

master's thesis

• Title (english): Mineralogical and geotehnical proporties of uppermiocene sediments on Perjavica landslide
• Author: Damir Pocrnić
• Mentor: Darko Tibljaš (mentor)
• Committee member: Darko Tibljaš (predsjednik povjerenstva)
• Committee member: Nenad Tomašić (član povjerenstva)
• Committee member: Đurđica Pezelj (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2021-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Mineralogy and Petrology

Abstract

U ovom radu određene su i opisane zajednice minerala glina i njihova svojstva koja su povezana s nastankom klizišta na sjeverozapadnom dijelu grada Zagreba u ulici Perjavica. Uzorci su prikupljeni istražnim bušenjem do dubine od 15 metara koje je provela tvrtka Geokon d.o.o. Kvalitativna analiza zajednice minerala glina izvršena je pomoću metode rendgenske difrakcije, Scheiblerovim kalcimetrom izmjeren je udio kalcijevog karbonata u uzorcima, mokrim sijanjem i sedigrafom određena je veličina čestica, dok su od geomehaničkih svojstava određene granice tečenja, granice plastičnosti i indeks plastičnosti. Rezultati su pokazali da su u gornjomiocenskim sedimentima s klizišta Perjavica, od minerala glina prisutni smektiti, kloriti, illit-muskoviti i kaolinit. Prema granulometrijskim analizama svi uzorci s iznimkom najplićeg, pripadaju prahovima. Udio kalcijevog karbonata kreće se u rasponu od 18,71% do 38,65%. Geomehaničkim mjerenjima utvrđeno je da su svi uzorci gline visoke plastičnosti. Najveći utjecaj na geomehanička svojstva imaju veličina zrna, mineralni sastav, udio zatečene vlage i udio glinovite komponente. Sukladno tomu, gornjomiocenski sedimenti s klizišta Perjavica izgrađeni su od sitnozrnatih, plastičnih prahova podložnih fizičkom trošenju i promijeni geomehaničkih svojstava koje je zasigurno imalo veliku ulogu u formiranju klizišta, moguće i kao sam pokretač mase.

Abstract (english)

In this paper, the communities of clay minerals and their properties related to the occurrence of landslides in the northwestern part of the city of Zagreb in Perjavica Street are determined and described. Samples were collected by exploratory drilling to a depth of 15 meters conducted by Geokon d.o.o. Qualitative analysis of the clay mineral community was performed using the X-ray diffraction method. Qualitative analysis of the clay mineral community was performed using the X-ray diffraction method. The results showed that in the Upper Miocene sediments from the Perjavica landslide, smectites, chlorites, illite-muscovites and kaolinite are present from clay minerals. According to granulometric analyses, all samples, with the exception of the shallowest one, belong to silt. The proportion of calcium carbonate ranges from 18.71% to 38.65%. Geomechanical measurements determined that all clay samples were of high plasticity. Grain size, mineral composition, moisture content and clay component content have the greatest influence on geomechanical properties. Accordingly, Upper Miocene sediments from the Perjavica landslide are composed of fine-grained, plastic silts subject to physical weathering and changing geomechanical properties, which certainly played a major role in landslide formation, possibly as a mass mover.

• Keywords: minerali glina; Atterbergove granice; gornjomiocenski sedimenti; klizište; geomehanička svojstva; mineraloška svojstva
• Keywords (english): Clay minerals; atterberg limits; uppermiocene sediments; landslide; geotehnical proporties; mineralogical proporties
• Language: croatian
• URN:NBN: urn:nbn:hr:217:962021
• Study programme: Title: Graduate university study of Geology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra geologije (magistar/magistra geologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-26 09:10:32