Microbe-induced desaturation of sand using pore pressure development by way of denitrification

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Abstract

Microbe-induced desaturation by denitrification is a technique that shows potential for mitigating the risk of liquefaction in sandy ground. The process proposed in this study, desaturation through denitrification, was tested using a sand column experiment. The experimental results showed the development of excessive pore pressure induced by biogas production by way of denitrification, which created a hydraulic gradient in the pores in the sand and eventually resulted in water seepage through these pores towards the surface of the sand. The experimental degree of soil water saturation was reduced by 11% at the centre of the specimen after gas production by microorganisms had completed. This indicates that it is possible to adjust the degree of saturation across small ranges by arranging these microbial reactions. However, the pore structure of the soil also strongly affects pore pressure development and determines the final degree of saturation. The general understanding of target soil properties, as well as the microbial reaction under target conditions, must improve before this technique is applied to practical situations.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalGeotechnique Letters
Volume8
Issue number1
DOIs
Publication statusPublished - Mar 1 2018

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All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

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