Norwegian Geotechnical Institute (NGI) Digital Archive
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Implementation of hydrometeorological thresholds for regional landslide warning in Catalonia (NE Spain)
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Arbeidspakke 1: Forundersøkelser og løsmasseforhold i Malvik
Get PDFHensikten med AP1 er å etablere et verktøy til Malvik kommune som kan vise områder
i Malvik som egner seg til en mulig utnyttelse av grunnvarme. AP1 har som delmål å
beskrive undersøkelsesmetoder/prosedyrer og parametere som er nødvendig for å
karakterisere løsmasser iht. utnyttelse av grunnvarme. Undersøkelsesmetoder som kan
brukes for karakterisering av termiske egenskaper i løsmasser presenteres og det er
etablert en database/kart som oppsummerer de viktigste parametere for løsmasser iht.
utnyttelse av grunnvarme for Malvik kommune. I AP1 er følgende aktiviteter utført:
1) Beskrivelse av undersøkelsesmetoder for å kartlegge potensialet for å utnytte
grunnvarme fra løsmasser.
2) Innhenting av data fra Malvik kommune ang. karakterisering av løsmasser for
utnyttelse av grunnvarme
3) Etablere et kart (GIS) som oppsummerer for løsmassetykkelse mtp. utnyttelse av
grunnvarme i Malvik kommune.Regionalt Forskningsfond Trøndelag (prosjektnummer 321116)
Urban stormwater capture for water supply: look out for persistent, mobile and toxic substances
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A Simplified Approach to Estimate Anchoring Capacity of Blocky Rock Mass with Pressure Arch Theory
Get PDFIn this paper, a simplified method for predicting rock mass resistance against tensile forces from rock anchors (anchor) is presented. The interaction of anchors and rock mass was investigated using three-dimensional discontinuous numerical modelling. Several patterns of rock discontinuities were assumed in the numerical modelling while a single anchor is embedded in it. The numerical results show that the existence of a discontinuity set sub-parallel to the anchor significantly improves the rock mass resistance against the tensile force from the anchors. This phenomenon is due to the rock block interlocking at the sub-parallel discontinuity set. Rock block interlocking generates a zone of stress concentration inside the rock mass which has an arch shape (i.e., a pressure arch), resisting against the anchor's tensile force. The load-bearing capacity of the pressure arch plays a significant role in the resistance of the rock mass against the forces from the rock anchor. A voussoir beam analogy was utilised to study the load-bearing capacity of the pressure arch. A simplified analytical approach was developed to assess the load-bearing capacity of the voussoir beams. Then, it was used in combination with the weight of the mobilised rock mass by the anchor to assess the maximum anchoring resistance of the rock mass (anchoring capacity). The suggested method was calibrated by numerical modelling and relevant published pull-out test results. The technique developed in this paper shows the significance of rock block size, shear behaviour of rock discontinuities, Young's modulus of the rock mass, and uniaxial compressive and tensile strength of the intact rock in anchoring capacity of rock masses.publishedVersio
Stabilisation of Soft Clay, Quick Clay and Peat by Industrial By-Products and Biochars
Get PDFThe stabilisation of soft soils using the traditional binders cement and quicklime are known to emit large amounts of carbon dioxide. To reduce this carbon footprint, substitutes such as industrial by-products have been thoroughly tested as viable alternatives for soil stabilisation. However, recent research has also shown that biochar from biomass pyrolysis can in some instances have a positive stabilisation effect and even result in a carbon-negative footprint. This paper presents a laboratory study to investigate the stabilisation effect of five industrial by-products and four types of biochar on three natural Norwegian soils: two clays with low and high water contents and one peat with a very high water content. The soils and binders were characterised by their mineralogical and chemical compositions. The biochars had varying stabilisation effects on the clays when combined with cement, with some negative stabilisation effects, whilst the effect was very beneficial in the peat, with a strength increase of up to 80%. The industrial by-products showed opposite results, with beneficial effects in the clays and a strength increase of up to 150%, but negative stabilisation effects in the peat. Correlating the mineralogical and chemical compositions to stabilisation effects was found to be challenging.Norges Forskningsråd 328767publishedVersio
Analytical solution for tunnelling-induced response of an overlying pipeline considering gap formation
Get PDFSoil-pipeline separation due to tunnelling has been certainly substantiated in previous model tests. However, this phenomenon has seldom been considered in current analytical solutions. This study formulates a tensionless Winkler solution that could make allowance for gap formation in soil-pipeline interaction analyses. The solution is validated by comparisons with existing experimental measurements and two recognized analytical solutions. Also, its advantage over an existing Winkler solution is addressed. Further parametric studies reveal that the effects of gap formation on the response of a pipeline rely largely on the tunnel volume loss and the pipeline’s bending stiffness and burial depth. In general, a pipeline’s bending moments and subgrade reaction forces are more susceptible than its deflections to the gap formation.Analytical solution for tunnelling-induced response of an overlying pipeline considering gap formationpublishedVersio
ArcGIS-verktøy for å vurdere innlekkasjekrav og konsekvenser av tunnel i urbane områder
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Flame curtain kilns produce biochar from dry biomass with minimal methane emissions
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