Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects

This study concerns the creep impact on strength parameters of the selected very cohesive soils (PI = 30–70%). The analysis refers to Neogene clays characterized by a complex structure, resulting directly from a complicated load history in the geological time scale and identified glacitectonic defor...

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Autores principales:	Kaczmarek Łukasz, Dobak Paweł, Szczepański Tomasz, Kiełbasiński Kamil
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	neogene clay strength x-ray computed microtomography warsaw slope undrained triaxial test safety factor Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/5fc7c62673194d3782d7360a89c231cd
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spelling	oai:doaj.org-article:5fc7c62673194d3782d7360a89c231cd2021-12-05T14:10:49ZTriaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects2391-544710.1515/geo-2020-0291https://doaj.org/article/5fc7c62673194d3782d7360a89c231cd2021-09-01T00:00:00Zhttps://doi.org/10.1515/geo-2020-0291https://doaj.org/toc/2391-5447This study concerns the creep impact on strength parameters of the selected very cohesive soils (PI = 30–70%). The analysis refers to Neogene clays characterized by a complex structure, resulting directly from a complicated load history in the geological time scale and identified glacitectonic deformations. In the process of samples’ preparation for strength tests as well as during the interpretation of the post-failure state, particular attention was paid to the soil structure. The imaging methods (X-ray densitometry and computer microtomography) enabled the comparison of the soil structure and the selection of samples with similar characteristics. The completed program of strength tests consisted of two series of tests in the triaxial stress state, differentiated by the occurrence of the initial creep stage, preceding the typical strength test scheme under undrained conditions. This study allowed to obtain a quantitative assessment of the influence of the creep process on the strength parameters of tested soils. Constant stress lower than 60% of the shear stress deviator leads to the deceleration creep course (m parameter 0.64–0.89). As a result, higher values of internal friction angle (20% increase comparing to triaxial tests without creep stage) and cohesion reduction are obtained from triaxial creep tests. Creep parameter m is found to be a valuable indicator for differentiation of landslide activity trend. The tests proved low values of axial strains (1–5%) at failure, which was associated with lithogenesis. By the implementation of obtained strength parameters into the 3D finite element model of the slope, the potential influence of the creep process on the stability of an exemplary cross section of the Warsaw slope could be determined.Kaczmarek ŁukaszDobak PawełSzczepański TomaszKiełbasiński KamilDe Gruyterarticleneogene claystrengthx-ray computed microtomographywarsaw slopeundrained triaxial testsafety factorGeologyQE1-996.5ENOpen Geosciences, Vol 13, Iss 1, Pp 1118-1138 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	neogene clay strength x-ray computed microtomography warsaw slope undrained triaxial test safety factor Geology QE1-996.5
spellingShingle	neogene clay strength x-ray computed microtomography warsaw slope undrained triaxial test safety factor Geology QE1-996.5 Kaczmarek Łukasz Dobak Paweł Szczepański Tomasz Kiełbasiński Kamil Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects
description	This study concerns the creep impact on strength parameters of the selected very cohesive soils (PI = 30–70%). The analysis refers to Neogene clays characterized by a complex structure, resulting directly from a complicated load history in the geological time scale and identified glacitectonic deformations. In the process of samples’ preparation for strength tests as well as during the interpretation of the post-failure state, particular attention was paid to the soil structure. The imaging methods (X-ray densitometry and computer microtomography) enabled the comparison of the soil structure and the selection of samples with similar characteristics. The completed program of strength tests consisted of two series of tests in the triaxial stress state, differentiated by the occurrence of the initial creep stage, preceding the typical strength test scheme under undrained conditions. This study allowed to obtain a quantitative assessment of the influence of the creep process on the strength parameters of tested soils. Constant stress lower than 60% of the shear stress deviator leads to the deceleration creep course (m parameter 0.64–0.89). As a result, higher values of internal friction angle (20% increase comparing to triaxial tests without creep stage) and cohesion reduction are obtained from triaxial creep tests. Creep parameter m is found to be a valuable indicator for differentiation of landslide activity trend. The tests proved low values of axial strains (1–5%) at failure, which was associated with lithogenesis. By the implementation of obtained strength parameters into the 3D finite element model of the slope, the potential influence of the creep process on the stability of an exemplary cross section of the Warsaw slope could be determined.
format	article
author	Kaczmarek Łukasz Dobak Paweł Szczepański Tomasz Kiełbasiński Kamil
author_facet	Kaczmarek Łukasz Dobak Paweł Szczepański Tomasz Kiełbasiński Kamil
author_sort	Kaczmarek Łukasz
title	Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects
title_short	Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects
title_full	Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects
title_fullStr	Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects
title_full_unstemmed	Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects
title_sort	triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/5fc7c62673194d3782d7360a89c231cd
work_keys_str_mv	AT kaczmarekłukasz triaxialcreeptestsofglacitectonicallydisturbedstiffclaystructuralstrengthandslopestabilityaspects AT dobakpaweł triaxialcreeptestsofglacitectonicallydisturbedstiffclaystructuralstrengthandslopestabilityaspects AT szczepanskitomasz triaxialcreeptestsofglacitectonicallydisturbedstiffclaystructuralstrengthandslopestabilityaspects AT kiełbasinskikamil triaxialcreeptestsofglacitectonicallydisturbedstiffclaystructuralstrengthandslopestabilityaspects
_version_	1718371669669576704

Triaxial creep tests of glacitectonically disturbed stiff clay – structural, strength, and slope stability aspects

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