| dc.description.abstract | In recent years, new challenges have arisen due to problems related to warming ground temperatures associated with permafrost degradation. The frozen soil creep is one of the main sources of the degradation. Creep has given rise to many foundation failures in cold regions. In Longyearbyen, the marine sediment composition of permafrost has led to greater creep. The creep behavior of frozen soils depends on several numbers of factors and is complex. Stress and temperature histories as well as the actual composition of the frozen soil are only some aspects that have to be considered when analyzing the mechanical response. Considering the complexity of the creep behavior, experimental studies are necessary to be able to address the permafrost degradation behavior produced by creep.
This study studies the rheological properties of the saline frozen fine-grained soil from a Nunataryuk project test site located within the previous NGTS project site called UNIS East in Longyearbyen by doing creep and strength laboratory tests. Focus on studying the creep properties that will lead to settlements of the foundations. A series of unconfined constant stress creep tests at low stresses were carried out for the soil in question to obtain the relationship between strain rate and stress. With the results from the soil tests, the calibration of the creep parameters in the creep model can be obtained. These parameters of the frozen soil are intended to be applicable to the Nunataryuk pile campaign of deep circular footings and screw anchors embedded in saline permafrost soils.
The design parameters obtained from this experimental study can give us better idea for future foundation design under the consideration of limiting long-term creep settlements to tolerable levels. | |
