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Numerical parametric study on the influence of location and inclination of large-scale asperities on the shear strength of concrete-rock interfaces of small buttress dams
Sintef Narvik AS, 8517 Narvik, Norway; Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway.ORCID iD: 0000-0002-2894-8659
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-8362-297X
Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0003-3548-6082
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2024 (English)In: Journal of Rock Mechanics and Geotechnical Engineering, ISSN 1674-7755Article in journal (Refereed) Epub ahead of print
Abstract [en]

When assessing the sliding stability of a concrete dam, the influence of large-scale asperities in the sliding plane is often ignored due to limitations of the analytical rigid body assessment methods provided by current dam assessment guidelines. However, these asperities can potentially improve the load capacity of a concrete dam in terms of sliding stability. Although their influence in a sliding plane has been thoroughly studied for direct shear, their influence under eccentric loading, as in the case of dams, is unknown. This paper presents the results of a parametric study that used finite element analysis (FEA) to investigate the influence of large-scale asperities on the load capacity of small buttress dams. By varying the inclination and location of an asperity located in the concrete-rock interface along with the strength of the rock foundation material, transitions between different failure modes and correlations between the load capacity and the varied parameters were observed. The results indicated that the inclination of the asperity had a significant impact on the failure mode. When the inclination was 30° and greater, interlocking occurred between the dam and foundation and the governing failure modes were either rupture of the dam body or asperity. When the asperity inclination was significant enough to provide interlocking, the load capacity of the dam was impacted by the strength of the rock in the foundation through influencing the load capacity of the asperity. The location of the asperity along the concrete-rock interface did not affect the failure mode, except for when the asperity was located at the toe of the dam, but had an influence on the load capacity when the failure occurred by rupture of the buttress or by sliding. By accounting for a single large-scale asperity in the concrete-rock interface of the analysed dam, a horizontal load capacity increase of 30%–160% was obtained, depending on the inclination and location of the asperity and the strength of the foundation material.

Place, publisher, year, edition, pages
Elsevier, 2024.
Keywords [en]
Asperity inclination, Asperity location, Buttress dam, Concrete dam, Concrete-rock interface, Shear strength, Sliding
National Category
Geotechnical Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-106124DOI: 10.1016/j.jrmge.2023.12.036Scopus ID: 2-s2.0-85194185166OAI: oai:DiVA.org:ltu-106124DiVA, id: diva2:1867419
Funder
Swedish Research Council Formas, 2019-01236
Note

Funder: Research Council of Norway (244029, 2019-01236); SVC (VKU32019);

Full text license: CC BY-NC-ND 4.0;

Available from: 2024-06-10 Created: 2024-06-10 Last updated: 2024-06-10

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Ulfberg, AdrianGonzalez-Libreros, JaimeSas, Gabriel

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2324252627282926 of 79
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