Flow cone – new CPTU add-on module trialled in Halden silt

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GEODIP's high-quality database: Clay

The purpose of this report is to present GEODIP's high quality database for clay materials. The database integrates existing high quality data from block sampling in clay as well as supplementary data from research and development (R&D) assignments, both offshore and onshore. The data is presented in the form of plots for possible correlations between strength and deformation parameters against index properties. The data is also compared to correlations found in the literature. Suggestions are given for field and laboratory work to supplement the data already included in the database. The report has been revised and updated in 2016-2017 (revision 1 and revision 2) to include the following: a) notes from a quality control of the data included in the database (section 5), b) notes about the scatter of the data in the database (section 6), and c) mineralogical data obtained from the literature and laboratory work performed in selected sites in the database (section 8)

Field verification tests of the newly developed flow cone tool—In-situ measurements of hydraulic soil properties

Hydraulic soil properties, and in particular the hydraulic conductivity, is important in a number of geotechnical design cases. However, attention is often drawn towards the method of analysis rather than the quality and validity of the hydraulic properties used as input. Intact samples of sand or silt are difficult or impossible to obtain, and prediction of hydraulic soil properties from available in-situ tools represents a challenge. With the aim of quick and reliable in-situ measurements of hydraulic properties of sands and silts, NGI developed a prototype tool referred to as the flow cone. The tool combines the widely used cone penetration test with an add-on pumping system that allows water to flow into the surrounding sediments during cone penetration and stand-still. By measuring flow rates and pore water pressures, the hydraulic properties of the surrounding soil can be estimated. The flow cone prototype was tested at the NGTS sand site (Øysand, Norway) in September 2018. The aim of this paper is to present the measured and interpreted results. The results are evaluated within the context of available data from the sand site including cone penetration tests, in-situ falling head tests, grain size distributions and constant head tests from laboratory. Recommendations for further work and potential applications in engineering practice are discussed.Field verification tests of the newly developed flow cone tool—In-situ measurements of hydraulic soil propertie

Field verification tests of the newly developed flow cone tool—In-situ measurements of hydraulic soil properties

Hydraulic soil properties, and in particular the hydraulic conductivity, is important in a number of geotechnical design cases. However, attention is often drawn towards the method of analysis rather than the quality and validity of the hydraulic properties used as input. Intact samples of sand or silt are difficult or impossible to obtain, and prediction of hydraulic soil properties from available in-situ tools represents a challenge. With the aim of quick and reliable in-situ measurements of hydraulic properties of sands and silts, NGI developed a prototype tool referred to as the flow cone. The tool combines the widely used cone penetration test with an add-on pumping system that allows water to flow into the surrounding sediments during cone penetration and stand-still. By measuring flow rates and pore water pressures, the hydraulic properties of the surrounding soil can be estimated. The flow cone prototype was tested at the NGTS sand site (Øysand, Norway) in September 2018. The aim of this paper is to present the measured and interpreted results. The results are evaluated within the context of available data from the sand site including cone penetration tests, in-situ falling head tests, grain size distributions and constant head tests from laboratory. Recommendations for further work and potential applications in engineering practice are discussed

Standardization of in situ tests and field work

The Norwegian Geo-Test Sites (NGTS) research infrastructure, with funding from The Research Council of Norway, creates a national research test site facility for geotech-nical research. The five national test sites are located in Norway and on Svalbard. The research consortium consists of NGI and NTNU, SINTEF/UNIS and NPRA (Norwegian Public Roads Administration). The research project aims at developing five sites as field laboratories for the testing and verification of innovative soil investigation and testing methods. The sites cover the soil conditions of soft clay, quick clay, silt, sand and per-mafrost. At the end of the project, the test sites will serve as reference sites for the in-dustry, public authorities, research organizations and academia where benchmarked data can be used by several generations of scientists and engineers to develop soil material models, new investigation methods, new foundation solutions and advance the state-of-the-art. The five sites will be operative for at least 10-20 yrs. To ensure quality of the data generated in the project and to ensure as much uniformity of the results as possible it is important that all partners performing work at the sites follow the same test procedures and standards. The present report give an overview of the main in situ testing methods and sampling techniques to be used in the NGTS project. Work at the NGTS sites shall be performed according to the referenced standards and requirements listed in the present report.Research Council of Norway (RCN

Standardization of in situ tests and field work

The Norwegian Geo-Test Sites (NGTS) research infrastructure, with funding from The Research Council of Norway, creates a national research test site facility for geotech-nical research. The five national test sites are located in Norway and on Svalbard. The research consortium consists of NGI and NTNU, SINTEF/UNIS and NPRA (Norwegian Public Roads Administration). The research project aims at developing five sites as field laboratories for the testing and verification of innovative soil investigation and testing methods. The sites cover the soil conditions of soft clay, quick clay, silt, sand and per-mafrost. At the end of the project, the test sites will serve as reference sites for the in-dustry, public authorities, research organizations and academia where benchmarked data can be used by several generations of scientists and engineers to develop soil material models, new investigation methods, new foundation solutions and advance the state-of-the-art. The five sites will be operative for at least 10-20 yrs. To ensure quality of the data generated in the project and to ensure as much uniformity of the results as possible it is important that all partners performing work at the sites follow the same test procedures and standards. The present report give an overview of the main in situ testing methods and sampling techniques to be used in the NGTS project. Work at the NGTS sites shall be performed according to the referenced standards and requirements listed in the present report