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Improvement of Soft Soils Using Bio-Cemented Sand Columns

Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

This paper discusses the results of small-scale model tests that were undertaken to investigate the behaviour of un-cemented and bio-cemented coarse sand columns installed within a soft clay bed. The tests also focused on studying the effect of biocementation to reduce excessive radial expansion and settlement that may occur during installation or loading of sand columns. A multi-phase biochemical treatment strategy was used to obtain a partial biocementation, in particular at the upper section of the sand column where bulging usually occurs. The results show that the partially bio-cemented sand column substantially reduced vertical strains which were in the order of 71% and 97% compared with un-cemented sand column and kaolin clay, respectively. The bulging of the bio-cemented sand column was associated with the bottom section of the column where there were no or less bio-cemented materials.

Keywords

  • Biocementation
  • Sand column
  • Soft soil

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Fig. 1.

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Correspondence to Aamir Mahawish .

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Mahawish, A., Bouazza, A., Gates, W.P. (2018). Improvement of Soft Soils Using Bio-Cemented Sand Columns. In: Wu, W., Yu, HS. (eds) Proceedings of China-Europe Conference on Geotechnical Engineering. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-97112-4_184

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  • DOI: https://doi.org/10.1007/978-3-319-97112-4_184

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-97111-7

  • Online ISBN: 978-3-319-97112-4

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