Abstract
Apparent swelling pressure of compacted bentonite (ps) is a basic parameter for structure design for the geological disposal projects of high-level radioactive waste (HLW). The equilibrium apparent swelling pressure (peq) observed by wetting compacted bentonite have been reported extensively in past studies, however, peq variation, i.e. difference between peq measurements under similar conditions, may significantly large equilibrium swelling pressure. This variation was sometimes attributed to swelling deformation of specimens during testing, however, few studies discussed this issue in detail. In this study, a swelling pressure apparatus was newly developed with aim of obtaining good repeatable peq measurements. Efforts are made on apparatus design to achieve simple configuration, low cost and low system compliance. A series of tests were conducted to find a proper way of obtaining peq with less variation for identical specimens. It was found that slight deformation of might not be the fundamental reason for peq variation, however, slight deformation may introduce difficulties of dry density measurement, which may result in apparent peq variation. With the new apparatus, good repeatability of ps measured on identical specimens was obtained. The apparatus may provide an inexpensive tool for further understanding the behaviours of compacted bentonite.
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Acknowledgements
This work was performed as a part of the activities of the Research Institute of Sustainable Future Society, Waseda Research Institute for Science and Engineering, Waseda University, and supported by Kajima Foundation, Taisei Foundation. The authors express their deep gratitude to all those described above.
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Wang, H., Shirakawabe, T., Ito, D. (2023). Apparatus Design and Measuring of Apparent Swelling Pressure of Compacted Bentonite. In: Atalar, C., Çinicioğlu, F. (eds) 5th International Conference on New Developments in Soil Mechanics and Geotechnical Engineering. ZM 2022. Lecture Notes in Civil Engineering, vol 305. Springer, Cham. https://doi.org/10.1007/978-3-031-20172-1_5
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