Cristin-resultat-ID: 1928452
Sist endret: 13. september 2021, 14:44
Resultat
Vitenskapelig artikkel
2021

Compositional Features and Swelling Potential of Two Weak Rock Types Affecting Their Slake Durability

Bidragsytere:
  • Lena Selen
  • Krishna Kanta Panthi
  • Mai Britt Engeness Mørk og
  • Bjørn Eske Sørensen

Tidsskrift

Geotechnics
e-ISSN 2673-7094
NVI-nivå 0

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2021
Volum: 1
Hefte: 9
Sider: 172 - 191
Open Access

Beskrivelse Beskrivelse

Tittel

Compositional Features and Swelling Potential of Two Weak Rock Types Affecting Their Slake Durability

Sammendrag

Weak and weathered rocks are well known for their sensitivity to changes in moisture content. Degrading behavior is common in weak rocks with moisture-sensitive mineral components and present numerous stability problems. The slake durability is a measure of the resistance to weakening and disintegration of rock materials which quantitatively distinguishes durable from non-durable rock materials. Several rock material parameters interact on the process of disintegration when exposed to cyclic moisture changes, whereby the content of clay is believed to play a major role. This manuscript evaluates the overall material composition of flysch and serpentinite rocks cored from the wall of the shotcrete-lined headrace tunnel of a hydropower project, including minerals, structure, porosity, the presence of micro-discontinuities, and swelling potential, and links these properties to the slake durability. Further, the different methods used to assess compositional features affecting the durability of weak rocks are evaluated and discussed. The manuscript argues that the mineralogical composition and microstructures present in the intact rock and the content of moisture-sensitive constituents, as swelling clays, control the long-term durability of weak rock material. It is demonstrated that XRD assessments are not sufficient to detect the content of brucite and swelling components, and that methods as thin section and SEM analyses should be carried out in the assessment of weak and weathered rock mass.

Bidragsytere

Lena Selen

  • Tilknyttet:
    Forfatter
    ved Miljø og ingeniørgeologi ved Norges Geotekniske Institutt

Krishna Kanta Panthi

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap og petroleum ved Norges teknisk-naturvitenskapelige universitet

Mai Britt Engeness Mørk

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap og petroleum ved Norges teknisk-naturvitenskapelige universitet

Bjørn Eske Sørensen

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap og petroleum ved Norges teknisk-naturvitenskapelige universitet
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