EXPERIMENTAL STUDY OF ROCK RUPTURES SHEAR STRENGTH ANISOTROPY

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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PROISL Tomáš MELICHAR Rostislav

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj Acta Geodynamica et Geomaterialia
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.irsm.cas.cz/index_en.php?page=acta_detail_doi&id=431
Doi http://dx.doi.org/10.13168/AGG.2022.0001
Klíčová slova Shear strength; Anisotropy; Joints; Faults
Popis Joints significantly reduce rock cohesion compared to unfractured rock, but the question is what effect the possible anisotropy of the shear strength of different types of rupture has on possible subsequent failure. Both natural samples of granodiorite with natural joints and fault surfaces and gypsum models have been tested on the Matest A129 Rock shear box apparatus. The shear strength of preexisting ruptures was measured under a fixed normal stress component. The anisotropy of the shear strength of the joints and fault surfaces reached more than 60 % of maximum strength, which is a very important value for solving structural loads. The shear strength was analyzed with polar plots. The pattern of the real joints typically showed a teardrop shape with one peak of strength in a certain direction and a minimum in the opposite direction. On the contrary, striated fault surfaces are characterized by two axial directions of minimal shear strength, i.e., longitudinal and transverse, and by two axial oblique directions with maximal shear strength, so the strength distribution in the polar graph has a four-cornered shape. The study showed that the anisotropy of the shear strength of various types of ruptures is their important feature.
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