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Träfflista för sökning "WFRF:(Dahlström Lars) srt2:(1990-1994)"

Sökning: WFRF:(Dahlström Lars) > (1990-1994)

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1.
  • Ahlsén, Bertil, et al. (författare)
  • Ombyggnad Torslanda
  • 1990
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Consumer report for the company in question (the Volvo Automobile Company and the Volvo Torslanda plant) which is financed by the company and partly also by a research foundation. It is a matter of a work that in this particular case were carried out during nine years in a number of experimental workshops located outside the Chalmers University of Technology. These workshops were financed by the Volvo Automobile and Truck companies. This achievement, as the final contribution to the Swedish automotive industry after having already treated this research field/problem area for more than two decades before this particular period if time (involving several junior and senior research competencies, as well as industrial and governmental foundings).
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2.
  • Dahlström, Lars-Olof, 1958 (författare)
  • Rock Mechanical Consequences of Refrigeration. A Study Based on a Pilot Scale Rock Cavern
  • 1992
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The deformation of a rock mass due to temperature decrease below freezing is very complex, since many factors are involved; thermal strain, strain due to stress change, stress re-distribution, ice formation and the temperature dependency of rock mechanical and thermo-physical properties. The objective of this study was to achieve a better understanding of the rock mass response to thermo-mechanical loading when storing low temperature products in rock caverns excavated in hard crystalline rock masses. The study includes a literature survey, a hypothesis, a series of laboratory tests, a pilot scale field test and an analysis. In order to investigate the rock mass response to thermo-mechanical loading, rock specimens in the laboratory were tested at low temperatures. A pilot scale rock cavern, with a height of 15 m and a diameter of 7 m, was tested under refrigerated conditions. In the laboratory, rock cores taken from the field test area were investigated in order to estimate compressive strength, tensile strength, Young's modulus, Poisson's ratio and the coefficient of thermal contraction as a function of decreased temperature. The pilot scale test cavern was refrigerated for about 5 months. Temperatures and deformations were measured frequently during the cooling period. Radial deformations and temperatures were measured in the rock cavern, as well as in the host rock mass. Tangential deformations were measured at the mid-height of the cavern. Stress changes were recorded in the vicinity of the rock wall. In total, the rock instrumentation system consisted of 193 instruments.
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