Abstract
During block sampling the in situ total stresses reduces to zero. This ultimately allows the soil sample to swell, leading to a weaker soil structure. In this paper, an attempt has been made to investigate this mechanism experimentally. In doing so, a new laboratory test procedure has been developed where the formation of a soil is simulated with a built in piezometer to study the stress changes in soil samples during and after sampling. The results show that the tested sample tends to lose a significant part of its residual effective stresses instantaneously, allowing the sample to swell.
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Acknowledgements
Engineers P. Østensen, F. Stæhli and T. Westrum at NTNU are gratefully acknowledged for their skills and knowledge, without which the experimental work would have been impossible. The intergovernmental research program Natural hazards: Infrastructure, Floods & Slides (2012–2015) is acknowledged for their support. The first author partly supported by the OFFPHD program by the Research Council of Norway, Grant No. 246629. The authors gratefully acknowledge Dr. S. Degago from Norwegian Public Road Administration for reviewing this paper.
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Amundsen, H.A., Dang, H., Adamson, M., Emdal, A., Thakur, V. (2017). A New Laboratory Procedure to Study Stress Relief in Soil Samples. In: Thakur, V., L'Heureux, JS., Locat, A. (eds) Landslides in Sensitive Clays. Advances in Natural and Technological Hazards Research, vol 46. Springer, Cham. https://doi.org/10.1007/978-3-319-56487-6_11
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DOI: https://doi.org/10.1007/978-3-319-56487-6_11
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