Modifying the Casagrande curve-fitting method to account for 3D axisymmetric consolidation

Lovisa, J., Sivakugan, N., MacDonald, S., Thomas, S., and Read, W.W. (2014) Modifying the Casagrande curve-fitting method to account for 3D axisymmetric consolidation. In: Oka, Fusao, Murakami, Akira, Uzuoka, Ryosuke, and Kimoto, Sayuri, (eds.) Computer Methods and Recent Advances in Geomechanics. Computer Methods and Recent Advances in Geomechanics . CRC Press, London, UK, pp. 523-528.

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Great care is taken to ensure traditional laboratory consolidation tests operate under onedimensional conditions. In doing so, restrictions must be imposed upon specimen size (the height to diameter ratio must be less than 0.4), loading setup (the load must be applied vertically and ensure equal strains) and drainage configuration (water must vertically drain through the top and/or bottom of the sample). These restrictions not only severely limit the versatility of an oedometer test, but unnecessarily protract the time required for testing, and only allow determination of the vertical coefficient of consolidation. A three-dimensional consolidation test, however, could significantly shorten this testing time, and allow for evaluation of consolidation anisotropy of the soil (i.e. ratio of horizontal to vertical consolidation coefficients, cr/cv). Whilst it is relatively straightforward to modify a one-dimensional oedometer test to allow for three-dimensional consolidation, the difficulty lies within the subsequent analysis of settlement-time data, which must be fitted to the theoretical curve corresponding to three-dimensional consolidation. In this paper, the curve-fitting method proposed by Casagrande for evaluation of cv from one-dimensional oedometer tests has been extended to allow for threedimensional consolidation. This method was then used to analyse data from three-dimensional consolidation tests on reconstituted Kaolinite, yielding values for cr/cv in the range of 0.9 to 2.2, which compare well with the anisotropic properties of Kaolinite reported in literature.

Item ID: 35525
Item Type: Book Chapter (Research - B1)
ISBN: 978-1-315-73319-7
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Date Deposited: 19 May 2015 23:03
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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