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Experimental Development and Field Validation of Rock Anchors for Sustainable Onshore Foundations
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0003-1358-2364
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0002-3481-1368
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0002-4182-5653
RISE Research Institutes of Sweden, Safety and Transport, Fire and Safety.ORCID iD: 0000-0002-0033-1841
2024 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 2745, article id 012011Article in journal (Refereed) Published
Abstract [en]

The development of an innovative rock anchor prototype manufactured using high strength steel sheets produced locally in Sweden is the core of the PROWIND concept. Steel sheets provide a design freedom to easily manufacture complex geometries, which can be advantageous to enhance the shear force transmission in the bond-length segment of the anchor. The underlying challenge of this concept has been to design a solution which meets the design requirements of today and future technological advancements, all while keeping conventional installation practices in mind. The project followed a 4-step development process: (1) concept analysis and modelling, (2) small-scale prototypes testing and (3) large scale lab-validation and lastly (4) field validation. The performance of the developed rock anchor prototype and grouting material was experimentally quantified on both small and large-scale test specimens and also validated in full scale in the field concerning installation process, proof-loading and maintaining the prestress over time. The PROWIND anchors with the end feature with ribbed design have 4-5 times higher load bearing capacity. The experience from the anchor installation proved that the developed grout and anchors are faster and easier to install. The field test in two different geological conditions has proven that the news design is reducing the required anchorage length to just 1 meter. The restressing of anchors is fully possible with the proposed lock-off solution with a nut. All of those contribute to lower costs of installations and possibly longer service-life.

Place, publisher, year, edition, pages
Institute of Physics , 2024. Vol. 2745, article id 012011
Keywords [en]
Anchors; Bond length; Grouting; High strength steel; Installation; Steel sheet; Complex geometries; Design freedom; Experimental development; Field validation; Force transmission; High-strength steel sheet; Installation practices; Rock anchors; Shear force; Technological advancement; Mortar
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:ri:diva-73253DOI: 10.1088/1742-6596/2745/1/012011Scopus ID: 2-s2.0-85193041344OAI: oai:DiVA.org:ri-73253DiVA, id: diva2:1860125
Conference
WindEurope Annual Event 2024 Conference. Bilbao, Spain. 20 March 2024 through 22 March 2024
Note

The research presented in this paper has been financed by The Swedish Energy Agency (Energimyndigheten) within the project PROWIND \u201CPROWIND rock-adaptors for wind power\u201D (51382-1) in years 2022-2024.

Available from: 2024-05-23 Created: 2024-05-23 Last updated: 2024-05-27Bibliographically approved

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Suchorzewski, JanFlansbjer, MathiasArun Chaudhari, OjasWilliams Portal, Natalie

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