Norwegian Geotechnical Institute (NGI) Digital Archive
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Reviewing the Soil Abrasion Test™: Insights from two decades of NTNU and SINTEF research
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Per- and polyfluoroalkyl substance (PFAS) removal from soil washing water by coagulation and flocculation
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Propagating speedups during quiescence escalate to the 2020-2021 surge of Sít' Kusá, southeast Alaska
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Nanoscale mechanical properties of organic-rich Draupne caprock shale using nano-indentation method, offshore Norway
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Biochar dispersion in a tropical soil and its effects on native soil organic carbon
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Consequences of geometrical imperfections for deep dry mixing columns in a deep excavation pit
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Performance of cantilever sheet pile walls in sensitive clays: Case study Campus Ullevål
Full text linkThe continuous development of urban areas often requires underground constructions close to existing structures and in challenging ground conditions. In Norway, deep excavations in soft marine clays are usually supported by sheet pile walls (SPW) and tieback anchors or internal struts to safeguard the excavation pit and its surroundings until sufficient support is provided by the permanent structure. Cantilever SPWs are rarely used, as deflections are often quite significant. Furthermore, the acting earth pressure distribution, and consequently also the deflection profile, is often difficult to predict. Particularly, the earth pressure distribution and its development over time warrants further investigation. The research project CURIOUS (Campus Ullevål: Research and Instrumentation Of Underground Structures) was initiated at NGI to study and improve the design of cantilever SPW in sensitive clays. A six-meter-deep excavation pit in Oslo was equipped with an elaborate monitoring system, including strain sensors on the SPW, inclinometers, load cells on temporary struts and geodetic points, to gain a better understanding of the earth pressure development along the retaining structure during the different construction stages. In this paper, results of the instrumentation are presented for different construction phases. The earth pressure distribution acting along the SPW was back calculated based on monitoring data and further compared with predicted distributions.Performance of cantilever sheet pile walls in sensitive clays: Case study Campus UllevålpublishedVersio
Contents WP 2 – Full-scale experiments at Ryggfonn. Ryggfonn avalanche observations 2022/2023
Full text linkNGI has operated the avalanche test site at Ryggfonn in Stryn municipality, Vestland county, western Norway (61.969°N, 7.275°E) since the early 1980s.
In addition to the field work and data collection in the framework of WP2, necessary repairs and updating of the data acquisition system at the Ryggfonn avalanche test site were carried out under this task. This ensured that the site was ready for the winter season 2022/2023.NVE (Norges vassdrags- og energidirektorat)publishedVersio