Improvement of soft soils using bio-cemented sand columns

Aamir Mahawish, Abdelmalek Bouazza, Will P. Gates

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

3 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationProceedings of China-Europe Conference on Geotechnical Engineering
EditorsWei Wu, Hai-Sui Yu
Place of PublicationCham Switzerland
Number of pages4
ISBN (Electronic)9783319971124
ISBN (Print)9783319971117
Publication statusPublished - 2018
EventChina-Europe Conference on Geotechnical Engineering 2016 - Vienna, Austria
Duration: 13 Aug 201616 Aug 2016


ConferenceChina-Europe Conference on Geotechnical Engineering 2016
Internet address


  • Biocementation
  • Sand column
  • Soft soil

Cite this