Regularities of failure of migmatized gneiss with metamorphic
foliation

J 2018

Regularities of failure of migmatized gneiss with metamorphic foliation

BERČÁKOVÁ, Andrea, Rostislav MELICHAR a Kamil SOUČEK

Základní údaje

Originální název

Regularities of failure of migmatized gneiss with metamorphic foliation

Autoři

BERČÁKOVÁ, Andrea (703 Slovensko, garant, domácí), Rostislav MELICHAR (203 Česká republika, domácí) a Kamil SOUČEK (203 Česká republika)

Vydání

Geology, Geophysics & Enviroment, Krakow, Wydawnictwa AGH, 2018, 2299-8004

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10505 Geology

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Kód RIV

RIV/00216224:14310/18:00102859

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

strength anisotropy; uniaxial compressive strength; metamorphic foliaiton

Změněno: 31. 5. 2018 13:09, doc. RNDr. Rostislav Melichar, Dr.

Anotace

V originále

The research is focused on an exploration of the mechanical anisotropy and fracture process of a rock with planes of weakness. In this study, the strength behavior of migmatized gneiss with weakened planes, i.e. metamorphic foliation is evaluated. Metamorphic foliation with a specific orientation of rock grains may results that the mechanical behavior, and the mechanical properties, i.e. strength, are changed in different directions of loading. The strength anisotropy and the direction of weakening are in geomechanics not sufficiently clear until now. For these purposes, series of uniaxial compressive strength tests were carried out on the five groups of specimens of migmatized gneiss based on the different angle between foliation and loading. The measured results have shown that mechanical properties of the migmatized gneiss have different values concerning foliation. U-shaped anisotropy was obtained, in accordance to Ramamurthy distinguished curve of anisotropy (Ramamurthy, 1993) with the minimum average strength at anisotropy angle of 30 degree and the maximum average strength is reached when anisotropy angle is 90 degree. Next, an intensity of deformation, an orientation of new-created fractures due to foliation and a shape of fractured specimens were characterized. An extension failure parallel or subparallel to the loading and a shear failure were also recognized on the fractured rock specimens. The characterization should be a contribution to understanding of that, how an orientation of weakness planes influences the strength and the fracture formation of the rock. The knowledge of the problem is useful information for stability ensuring of underground construction, mine workings and for other geotechnical application.

Citovat

BERČÁKOVÁ, Andrea, Rostislav MELICHAR a Kamil SOUČEK. Regularities of failure of migmatized gneiss with metamorphic foliation. Geology, Geophysics & Enviroment. Krakow: Wydawnictwa AGH, 2018, roč. 44, č. 1, s. 150-151. ISSN 2299-8004.

@article{1419136,
   author = {Berčáková, Andrea and Melichar, Rostislav and Souček, Kamil},
   article_location = {Krakow},
   article_number = {1},
   keywords = {strength anisotropy; uniaxial compressive strength; metamorphic foliaiton},
   language = {eng},
   issn = {2299-8004},
   journal = {Geology, Geophysics & Enviroment},
   title = {Regularities of failure of migmatized gneiss with metamorphic foliation},
   volume = {44},
   year = {2018}
}

TY  - JOUR
ID  - 1419136
AU  - Berčáková, Andrea - Melichar, Rostislav - Souček, Kamil
PY  - 2018
TI  - Regularities of failure of migmatized gneiss with metamorphic foliation
JF  - Geology, Geophysics & Enviroment
VL  - 44
IS  - 1
SP  - 150-151
EP  - 150-151
PB  - Wydawnictwa AGH
SN  - 22998004
KW  - strength anisotropy
KW  - uniaxial compressive strength
KW  - metamorphic foliaiton
N2  - The research is focused on an exploration of the mechanical anisotropy and fracture process of a rock with planes of weakness. In this study, the strength behavior of migmatized gneiss with weakened planes, i.e. metamorphic foliation is evaluated. Metamorphic foliation with a specific orientation of rock grains may results that the mechanical behavior, and the mechanical properties, i.e. strength, are changed in different directions of loading. The strength anisotropy and the direction of weakening are in geomechanics not sufficiently clear until now. For these purposes, series of uniaxial compressive strength tests were carried out on the five groups of specimens of migmatized gneiss based on the different angle between foliation and loading. The measured results have shown that mechanical properties of the migmatized gneiss have different values concerning foliation. U-shaped anisotropy was obtained, in accordance to Ramamurthy distinguished curve of anisotropy (Ramamurthy, 1993) with the minimum average strength at anisotropy angle of 30 degree and the maximum average strength is reached when anisotropy angle is 90 degree. Next, an intensity of deformation, an orientation of new-created fractures due to foliation and a shape of fractured specimens were characterized. An extension failure parallel or subparallel to the loading and a shear failure were also recognized on the fractured rock specimens. The characterization should be a contribution to understanding of that, how an orientation of weakness planes influences the strength and the fracture formation of the rock. The knowledge of the problem is useful information for stability ensuring of underground construction, mine workings and for other geotechnical application.
ER  -

BERČÁKOVÁ, Andrea, Rostislav MELICHAR a Kamil SOUČEK. Regularities of failure of migmatized gneiss with metamorphic foliation. \textit{Geology, Geophysics \&{} Enviroment}. Krakow: Wydawnictwa AGH, 2018, roč.~44, č.~1, s.~150-151. ISSN~2299-8004.

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