Naslov
Mineralogical composition of the Kostanjek landslide sediments and its possible influence on the sliding and swelling processes

Autori
Martinčević, Jasmina ; Mihalić Arbanas, Snježana ; Krkač, Martin ; Bernat, Sanja ; Miklin, Željko ; Podolszki, Laszlo

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Landslide and Flood Hazard Assessment, Proceedings of the 1st Regional Symposium on Landslides in the Adriatic-Balkan Region / Mihalić Arbanas, Snježana ; Arbanas, Željko - Zagreb : Hrvatska grupa za klizišta, 2014, 17-21

ISBN
978-953-6923-26-7

Skup
1st Regional Symposium on Landslides in the Adriatic-Balkan Region

Mjesto i datum
Zagreb, Hrvatska, 06.03.2013. - 09.03.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
landslides; swelling; sliding; clay minerals; smectite; x-ray diffraction; Kostanjek landslide

Sažetak
One of a key point in the investigation and interpretation of landslides is the role of mineralogical and geochemical composition of sediment in physical and mechanical properties of soils, as well as its influence on sensitivity of landslide material to swelling and sliding. The objective of this paper is to present a mineralogical composition of sediments from the Kostanjek landslide area, aimed at interpretation of influence of its mineralogical and geochemical composition to sliding and swelling processes, especially regarding to clay minerals species like smectite clays. The analyses were performed on 17 samples collected from 100 m deep borehole B-1 drilled in the central part of the Kostanjek landslide in which the four lithological groups differ: engineering soil (Quaternary) ; massive marls (Upper Pannonian) ; marls intercalated with limestone, (Lower Pannonian) ; thinly laminated marls, also known as “Tripoli” sediments or tripolite (Lower Pannonian – Sarmatian). Samples K1 – K3 represent engineering soil, coarse to fine grained. Samples K4 – K11 represent massive marls while sample K12 represent the marls between limestone intercalations. Samples K13 – K17 represent thinly laminated clays recognized in two forms: flat laminated and wavy laminated. The analysis was performed by X-ray powder diffraction method on random and oriented mounts of air dried material, after glycol treatment and heating to 400˚C and 550˚C. The results of x-ray diffraction analyses represent a bulk composition of each sediment group. Predominant are sheet silicates, followed by carbonates and quartz. Dolomite and pyrite occur in some samples at trace levels. Among clay minerals the most abundant is smectite component (50–70 w%) which is susceptible to swelling. Namely, because of its characteristic structure, in interaction with circulating solution in soil, smectite clays increase the volume of crystal lattice and thus have a negative impact on shear strength parameters, which can result in the appearance of swelling or sliding.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA