Norwegian Geotechnical Institute (NGI) Digital Archive
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On Empirical Correlations for Normalised Shear Strengths from Fall Cone and Direct Simple Shear Tests in Soft Swedish Clays
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Time-lapse imaging of CO2 migration within near-surface sediments during a controlled sub-seabed release experiment
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Theoretical solution for drained cylindrical cavity expansion in clays with fabric anisotropy and structure
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Back-calculation of pillar foundation for Skjeggestad Bridge
Get PDFIn 2015, a landslide incapacitated the expressway E18 in southern Norway because one of the large foundation pillars of the southern lane of Skjeggestad Bridge near Mofjellbekken failed. This accident immobilised throughway traffic between Oslo and southern Norway for 17 months until the bridge became fully operational again. This paper focuses on the adjacent bridge pillar of the northern lane which experienced substantial displacements during the landslide. The paper presents the back-calculated reserve capacity of the pile foundation immediately after the landslide occurred. This was essential to establish the impact of the slide on the foundation capacity and evaluate the safety of the northern lane for traffic. The paper is a companion of the paper presenting the two-and three-dimensional analyses of the landslide that occurred in Mofjellbekken. The software Trimble NovaPoint Geosuite was used for an integrated design approach examining the soil layering, selecting the soil parameters and doing capacity calculations on the pile foundation (and calculating the stability analyses in the companion paper). The soil parameters were selected based on a statistical analysis of the key parameters and for cases with insufficient information correlations on similar soils are used. Two modelling approached were investigated to simulate the slide impact on the piles. The sensitivity of the lateral performance of the piles to soil stiffness was investigated based on recommendations from different guidelines. The implication of these analyses on pile cross-sectional utilization is discussed.publishedVersio
The Messinian Salinity Crisis as a trigger for high pore pressure development in the Western Mediterranean
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Introduction to the Special Series, “Incorporating Nature-based Solutions into the Built Environment”
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Upscaled Geocellular Flow Model of Potential Across-and along-Fault Leakage Using Shale Gouge Ratio
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Settlements of spread footing foundations on quick clay stabilized with lime and cement
Get PDFSince the early 70's ground improvement by use of stabilizing agents such as lime and cement has been widely used for solving geotechnical problems; either as a way to improve slope stability, reduce settlements or vibrations, or to reinforce the inside of braced excavations. On a recently constructed motorway project in south of Trondheim, two bridges were founded with spread footings on a medium stiff, quick Norwegian clay stabilized with lime and cement. The post-tensioned concrete bridges are 78 m and 110 m long, with respectively 4 and 5 spans. In this article, evaluation of various foundation solutions is performed based on cost estimates. This showed that the cost of founding the bridges on stabilized ground to be the most viable alternative. Further, the article discusses the calculation methods used to evaluate settlement properties of the foundations. Settlement measurement is performed for about two years after completion of the structures. A comparison of the calculated deformations and measured settlements is conducted in this work. Settlements are measured to be 3-10 mm after one and a half year, except for one abutment that measured 21 mm of vertical displacements. Then the deformations nearly stop for many of the foundations. The measurements show a higher deformation rate in the first six months after casting of the bridge slab, than expected from the calculations. After some time, the measurements coincide well within the upper and lower bounds in the calculations done in the geotechnical design. Possible reasons for these observations are discussed.publishedVersio
