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Title:Quantified joint surface description and joint shear strength of small rock samples
Authors:ID Fifer Bizjak, Karmen (Author)
ID Geršak, Andraž (Author)
Files:.pdf PDF - Presentation file, download (847,17 KB)
MD5: 17493C95479604008D5074F2A7D3E0EA
 
URL URL - Source URL, visit https://doi.org/10.5474/geologija.2018.002
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo ZAG - Slovenian National Building and Civil Engineering Institute
Abstract:Geotechnical structures in rock masses such as tunnels, underground caverns, dam foundations and rock slopes often have problems with a jointed rock mass. The shear behaviour of a jointed rock mass depends on the mechanical behaviour of the discontinuities in that particular rock mass. If we want to understand the mechanical behaviour of a jointed rock mass, it is necessary to study the deformation and strength of a single joint. One of the primary objectives of this work is to improve the understanding of the frictional behaviour of rough rock joints under shear loads with regard to the roughness of the joint surface. The main problem is how to measure and quantify the roughness of the surface joint and connect the morphological parameters into a shear strength criterion. Until now, several criteria have been developed; however, all of them used large rock samples (20×10×10 cm). It is often not possible to get large samples, especially when the rock is under a few meters thick layer of soil. In this case, samples of rock can only be acquired with investigation borehole drilling, which means that the samples of rock are small and of different shapes. The paper presents the modified criterion that is suitable for calculating the peak shear stress of small samples.
Keywords:camera-type 3D scanner, rock mechanics rock joint, roughness of the joints, rock joint shear strength
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2018
Publisher:Geološki zavod Slovenije
Year of publishing:2018
Number of pages:str. 25-32
Numbering:61, št. 1
PID:20.500.12556/DiRROS-17493 New window
UDC:55
ISSN on article:0016-7789
DOI:10.5474/geologija.2018.002 New window
COBISS.SI-ID:2384743 New window
Copyright:© Author(s) 2018.
Publication date in DiRROS:11.12.2023
Views:770
Downloads:396
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FIFER BIZJAK, Karmen and GERŠAK, Andraž, 2018, Quantified joint surface description and joint shear strength of small rock samples. Geologija [online]. 2018. Vol. 61, no. 1, p. 25–32. [Accessed 4 April 2025]. DOI 10.5474/geologija.2018.002. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=17493
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Record is a part of a journal

Title:Geologija
Shortened title:Geologija
Publisher:Geološki zavod Slovenije
ISSN:0016-7789
COBISS.SI-ID:5636866 New window

Document is financed by a project

Funder:EC - European Commission
Funding programme:H2020
Project number:636285
Name:Decision Support Tool for Rail Infrastructure Managers
Acronym:DESTinationRAIL

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Title:Geometrijske lastnosti površine razpok in strižna trdnost po razpoki za manjše vzorce kamnin
Abstract:Geotehnični objekti v hribini, kot so predori, podzemni prostori, pregrade in strme brežine, pogosto povzročajo težave zaradi različne razpokanosti hribinskega masiva. Strižno obnašanje celotnega hribinskega masiva je odvisno od razpok in njihovih strižnih lastnosti. Če želimo razumeti mehansko obnašanje hribinskega masiva, je potrebno preiskati strižne trdnostne karakteristike vsakega sistema razpok. Namen predstavljene raziskave je, da se preuči obnašanje razpok pod strižnimi obremenitvami v odvisnosti od hrapavosti površine razpok. Največji problem se pokaže pri meritvah hrapavosti razpok in povezave morfoloških parametrov površine razpoke s strižnimi karakteristikami same razpoke. Do sedaj je bilo predstavljenih že več kriterijev, vendar so bili vsi razviti na osnovi testiranja velikih vzorcev kamnine (20×10×10 cm). V večini primerov pa je velikih vzorcev kamnine nemogoče dobiti, predvsem takrat, ko je kamnina globoko pod več metrov debelo plastjo zemljine. V tem primeru se vzorce hribine lahko pridobi samo z raziskovalnim vrtanjem. Tako dobljeni vzorci pa so malih dimenzij in različnih oblik. V članku je predstavljen modificiran kriterij, ki je uporaben za izračun vrhunske strižne trdnosti v primeru, da imamo za raziskave dostopne samo vzorce manjših dimenzij.
Keywords:3D skener s kamero, mehanika hribin, hrapavost razpok, strižna trdnost kamnine po razpoki


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