Norwegian Geotechnical Institute (NGI) Digital Archive
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1356 research outputs found
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Design of Rock Support in Low Overburden and Hard Rock Conditions with the use of Rock Mass Classification Systems and Numerical Analyses: a Study Based on the Construction of the Hestnes Railway Tunnel, Norway
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The potential use of nature-based solutions as natural hazard mitigation measure for linear infrastructure in the Nordic Countries
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Sustainability report of the European large geotechnical institutes platform
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Implications of depth conversion on fault geometries and fault-risk assessment in the Smeaheia CO2 storage site, northern North Sea
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Disturbance of sand samples obtained by piston samplers and ground freezing
Full text linkHigh quality sampling of sand and silty sands is extremely challenging. Undisturbed samples of sand can be obtained by means of very expensive and time-consuming techniques such as ground freezing. Given the high costs and expertise required to obtain undisturbed sand samples through ground freezing, piston sampling techniques are usually used in engineering practice. This paper summarises the experiences, technical difficulties, disturbance analyses and issues encountered during sand sampling at the Norwegian Research Site at Øysand using piston sampling and ground freezing technology. Two state-of-the-art piston samplers were used (NGI-Geonor composite piston sampler and Geonor K-200 thin-wall push piston sampler) along with the state-of-the-art Japanese gel push piston sampler. Ground freezing was successfully achieved also both on sands and silty sands at Øysand. Sample disturbance was assessed qualitatively and quantitatively through analysis of micro-computed tomography images. Results from these analyses provide an overview of the strengths and weaknesses of the three piston samplers in comparison with ground freezing, together with recommendations for sampling of sands using piston techniques.Disturbance of sand samples obtained by piston samplers and ground freezingpublishedVersio
A two-dimensional effective stress framework for modelling whole-life soil strength changes due to pore pressure generation and dissipation, Part 2: Applications
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Directional flow in perivascular networks: mixed finite elements for reduced-dimensional models on graphs
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Control of grouting in the bedrock and soil in vicinity of tunnels and construction pits, Case study: E18, Oslo, Norway
Full text linkConstruction of open excavation pits and tunnels below groundwater level in urban areas are continuous geotechnical challenges. Reducing the water ingress to excavations is vital, to limit drawdown of the groundwater head at bedrock level and consequent consoli-dation settlements in soft clays deposits, which potentially can cause damage to nearby build-ings and infrastructure. In connection with the development of the E18 highway near the city of Oslo in Norway, a hydrogeological barrier consisting of sheet pile walls, rock mass pre- grouting and jet column grouting have been designed and executed for a deep excavation in soil and rock. This paper presents the design of the barrier and control of pre-grouting execu-tion which was required to optimize the barrier construction with respect to local ground conditions.Control of grouting in the bedrock and soil in vicinity of tunnels and construction pits, Case study: E18, Oslo, NorwaypublishedVersio
