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  • 1.
    Arellanoa, Santiago
    et al.
    Chalmers University of Technology, Sweden.
    Jacobsson, Lars
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Kasani, Björn
    RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
    Steffen, Holger
    Lantmäteriet, Sweden.
    EPOS Sweden: A national contribution to the European Plate Observing System-European Research Infrastructure Consortium2022In: Abstract book, 2022Conference paper (Other academic)
    Abstract [en]

    The pan-European “European Plate Observing System (EPOS)” is focussed on Europe and adjacent regions and includes geophysical monitoring networks, local observations (including permanent in-situ and volcano observatories), topographic/surface dynamics information, surface and subsurface geological information, experimental and laboratory data and functions, and satellite data. In 2021 the Swedish Research Council (VR) approved an application for Sweden to join EPOS-ERIC, formally establishing existing collaborations between EPOS and Swedish research infrastructures.

  • 2. Glamheden, Rune
    et al.
    Fälth, Billy
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Harrström, Johan
    Berglund, Johan
    Bergkvist, Lars
    Counterforce applied to prevent spalling2010Report (Refereed)
  • 3.
    Godio, Michele
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Jacobsson, Lars
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Experimental study on the hydromechanical behaviour of a natural unperturbed fracture under normal loading: Derivation of the equivalent hydraulic aperture and its digital reconstruction2024Report (Other academic)
    Abstract [en]

    This report describes the laboratory work undertaken to characterize the hydromechanical behaviour of a natural rock fracture under varying normal loading. The hydraulic transmissivity of a granite specimen with a sealed (unopened) quasi-planar natural fracture of length 200 mm and width 200 mm was measured. The transmissivity measurements were conducted in the two perpendicular directions of the fracture, repeating them at five different normal compression stress levels, namely, ~0, 1, 2, 4, and 8 MPa, and flow gradients. The fracture was mechanically opened, and the measurements were repeated to investigate the effect of opening the fracture on its hydraulic transmissivity and hydromechanical behaviour. For one direction, the change in transmissivity was explored for high normal compression stress levels, up to ~40 MPa. Laminar flow conditions were ensured at every stage of the experimental campaign by working at very low Reynolds numbers (<1). The equivalent hydraulic aperture of the fracture was derived by resorting to the parallel-plate model theory. The hydraulic aperture was compared to the mechanical aperture, which was obtained by measuring the deformation of the specimen. In addition to the transmissivity tests, the geometry of the lateral walls and surfaces of the fracture was documented and measured by a series of tools, namely, digital scans, high-resolution pictures, optical readings by a stand microscope, and contact pressure-sheet measurements. The results achieved in this campaign shed light on the hydraulic transmissivity of sealed (unopened) and consequently opened natural fractures, and its dependency to the applied normal compression stress at low to very-low flow rates.

    The full text will be freely available from 2024-05-01 08:00
  • 4.
    Godio, Michele
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Jacobsson, Lars
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Laboratory low-transmissivity tests on natural rock fracture under varying normal load2022In: Programme of Geological Society of Sweden 150 year Anniversary meeting., 2022Conference paper (Other academic)
    Abstract [en]

    There is limited available data on natural rock fractures with low hydraulic transmissivity. In this study, we measured the transmissivity of a granite specimen with a 200×200 mm naturally-induced closed fracture under varying normal load. We repeated the measurements after opening the fracture to investigate how this affects its transmissivity. At each stage, we ensured laminar flows by setting Reynolds numbers << 1. Finally, we resorted to the parallel-plate theory to obtain the equivalent hydraulic aperture, that we compared to the mechanical aperture derived from the observed deformation.

  • 5.
    Grigull, Susanne
    et al.
    SGI Sveriges geologiska undersökning, Sweden.
    Evins, Paul
    WSP, Sweden.
    Berglund, Johan
    SGI Statens geotekniska institut, Sweden.
    Bäckström, Ann
    Nitro Consult.
    Jacobsson, Lars
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Loorents, Karl-Johan
    Trafikverket, Sweden.
    Samuelsson, Eva
    Geosigma.
    Svensson, Mats
    Tyréns.
    Swindell, Robert
    Sweco.
    Johan, Thörn
    Bergab / Chalmers.
    Winell, Sofia
    Geosigma.
    Enkätstudie – Insamling och lagring av bergtekniska och hydrogeologiska data2020Report (Other academic)
    Abstract [en]

    Geotechnical and hydrogeological data are collected during all phases of construction projects. Currently, the collection of such data is not standardized and there is no central, national system for storing the collected data. It is also difficult to evaluate or re-use such data from previous projects which results in collecting the same field data from scratch for new infrastructure projects. Previous studies and this feasibility study have shown the need for clearer, improved methodologies for data collection along with a national portal for access to geotechnical and hydrogeological archives and data from previous projects.

    Through two surveys answered by key parties in the rock construction industry, we have identified geotechnical and hydrogeological parameters that need improved methodology and method descriptions and possibly standardization. Existing database solutions, as well as suggestions for the functionality of a future national database have also been analyzed from the survey responses.

    Survey results also show that data collection standardization is necessary to ensure data reliability and traceability, and that standardized methodologies should be adapted to project complexity and try to conform to current internationally accepted methodologies. However, the study also shows that industry views are divided on certain issues. How new methodologies and data portals / databases will be developed, funded, managed andimplemented also remains to be clarified.

    This feasibility study recommends a national database divided into a searchable document archive and a parameter database. One or more government organizations should be responsible for administration.

    The present report serves as a decision basis for initiating and financing projects in the area concerned. It is strongly recommended that any organization(s) that build a document archive and a national parameter database take into account the functional requirements mentioned in this report.

    Note that this report is also available in PDF format on Stiftelsen Bergteknisk Forskning- BeFo's website. The links in the report can be easily opened directly from the PDF file and images can be enlarged.

  • 6.
    Hanquist, Caroline
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Jacobsson, Lars
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Davidsson, Sandra
    RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
    Laboratory tests in borehole KFM01A, KFM08A, KFM11A, KFR102A and KFR104: Uniaxial compression and indirect tensile strength tests of intact rock2023Report (Other academic)
    Abstract [en]

    The density and mechanical properties were determined on water saturated specimens from boreholesKFM01A, KFM08A, KFM11A, KFR102A and KFR104 in the Forsmark site investigation area. Therock types in the selected sections were amphibolite (102017) and metavolcanic rock (103076). Somespecimens had a more or less foliated rock structure. The cores were sampled from a depth rangingbetween 196–901 m.The specimens were water saturated using tap water and all subsequent measurements wereconducted at this moisture condition. The density was determined on 30 specimens. The testingended with 20 indirect tensile tests yielding the indirect tensile strength and 10 uniaxial compressiontests including the post-peak response yielded the Young’s modulus, Poisson’s ratio and the uniaxialcompressive strength.Some variation of rock material along the short cores could be seen, which is reflected in themeasured data. The density at a water saturated condition was 2892–3067 kg/m3 for amphibolite, and2697–2763 kg/m3 for metavolcanic rock.The indirect tensile tests were conducted such that every specimen with visible foliation was testedwith the diametrical compression across the foliation planes, with higher values for the indirecttensile strength on the specimens. The strength variation in the amphibolite was large. The indirecttensile strength was 10.8–21.4 MPa for amphibolite and 16.9–20.7 MPa for metavolcanic rock. Twoof the amphibolite specimens had a deviating lower strength, indirect tensile strength 5.7 MParespectively 5.8 MPa, with a ductile failure. Those specimens had a high content of mica.The Young’s modulus obtained from the uniaxial compression tests was 88.6–114.5 GPa foramphibolite and 68.2–89.1 GPa for metavolcanic rock and the Poisson’s ratio was 0.339–0.386 foramphibolite and 0.236–0.313 for metavolcanic rock. The peak values of the axial compressive stresswere in the range 213.1–333.7 MPa for amphibolite and 104.1–283.1 MPa for metavolcanic rock.One of the amphibolite specimens had a deviating lower strength and a ductile failure with Young’smodulus 41.2 GPa, Poisson’s ratio 0.500 and peak axial compressive stress of 44.5 MPa. Thatspecimen had a high content of mica. 

  • 7.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    A plasticity model for ballast resistance2005Report (Refereed)
    Download full text (pdf)
    FULLTEXT01
  • 8.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM01A Triaxial compression test of intact rock. Forsmark site investigation2004Report (Refereed)
  • 9.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM01A Uniaxial compression test of intact rock. Forsmark site investigation2004Report (Refereed)
  • 10.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM01C Triaxial compression test of intact rock. Forsmark site investigation2006Report (Refereed)
  • 11.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM01C. Uniaxial compression test of intact rock. Forsmark site investigation2007Report (Refereed)
  • 12.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM01D Triaxial compression test of intact rock. Forsmark site investigation2006Report (Refereed)
  • 13.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM02A Triaxial compression test of intact rock. Forsmark site investigation2004Report (Refereed)
  • 14.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM02A Uniaxial compression test of intact rock. Forsmark site investigation2004Report (Refereed)
  • 15.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM03A Triaxial compression test of intact rock. Forsmark site investigation2004Report (Refereed)
  • 16.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM03A Uniaxial compression test of intact rock. Forsmark site investigation2004Report (Refereed)
  • 17.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM04A Triaxial compression test of intact rock. Forsmark site investigation2004Report (Refereed)
  • 18.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM04A Uniaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 19.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM05A. Normal stress and shear tests on joints. Forsmark site investigation2005Report (Refereed)
  • 20.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM05A. Triaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 21.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM05A. Uniaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 22.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM06A. Uniaxial compression test of intact rock containing sealed fractures. Forsmark site investigation2007Report (Refereed)
  • 23.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM06A. Uniaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 24.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM07A. Triaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 25.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM07A. Uniaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 26.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM07A. Uniaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 27.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM08A Triaxial compression test of intact rock. Forsmark site investigation2005Report (Refereed)
  • 28.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM08D. Indirect tensile strength test. Forsmark site investigation2007Report (Refereed)
  • 29.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM08D. Uniaxial compression test of intact rock. Forsmark site investigation2007Report (Refereed)
  • 30.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KFM09A. Triaxial compression test of intact rock. Forsmark site investigation2006Report (Refereed)
  • 31.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX02 Normal stress and shear tests on joints. Oskarshamn site investigation2004Report (Refereed)
  • 32.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX02. Uniaxial compression test of intact rock. Oskarshamn site investigation2004Report (Refereed)
  • 33.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX03A. Triaxial compression test of intact rock. Oskarshamn site investigation2005Report (Refereed)
  • 34.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX03A. Uniaxial compression test of intact rock. Oskarshamn site investigation2005Report (Refereed)
  • 35.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX04A Normal stress and shear tests on joints. Oskarshamn site investigation2004Report (Refereed)
  • 36.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX04A Triaxial compression test of intact rock. Oskarshamn site investigation2004Report (Refereed)
  • 37.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX04A Uniaxial compression test of intact rock. Oskarshamn site investigation2004Report (Refereed)
  • 38.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX06A. Triaxial compression test of intact rock. Oskarshamn site investigation2005Report (Refereed)
  • 39.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX08. Uniaxial compression test of intact rock. Oskarshamn site investigation2006Report (Refereed)
  • 40.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX10. Triaxial compression test of intact rock. Oskarshamn site investigation2006Report (Refereed)
  • 41.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX10. Uniaxial compression test of intact rock. Oskarshamn site investigation2006Report (Refereed)
  • 42.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX11A. Uniaxial compression test of intact rock. Oskarshamn site investigation2006Report (Refereed)
  • 43.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX12A. Triaxial compression test of intact rock. Oskarshamn site investigation2006Report (Refereed)
  • 44.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX12A. Uniaxial compression test of intact rock. Oskarshamn site investigation2006Report (Refereed)
  • 45.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX16A. Indirect tensile strength test. Oskarshamn site investigation2007Report (Refereed)
  • 46.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX16A. Uniaxial compression test of intact rock. Oskarshamn site investigation2007Report (Refereed)
  • 47.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Borehole KLX17A Microcrack volume measurements and triaxial compression test on intact rock. Oskarshamn site investigation2007Report (Refereed)
  • 48.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Boreholes KFM01A and KFM02B. Micro crack volume measurements and triaxial compression tests on intact rock. Forsmark site investigation2007Report (Refereed)
  • 49.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Boreholes KLX05 and KLX13A. Uniaxial compression test of intact rock. Oskarshamn site investigation2006Report (Refereed)
  • 50.
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Boreholes KLX17A, KLX18A and KLX21B. Uniaxial compression test of intact rock. Oskarshamn site investigation2007Report (Refereed)
123 1 - 50 of 132
CiteExportLink to result list
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  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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  • en-GB
  • en-US
  • fi-FI
  • nn-NO
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  • text
  • asciidoc
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