Geomechanics and Engineering

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Hydraulic conductivity of cemented sand from experiments and 3D Image based numerical analysis

  • Subramanian, Sathya (Department of Civil and Environmental Engineering, National University of Singapore) ;
  • Zhang, Yi (Department of Civil and Environmental Engineering, National University of Singapore) ;
  • Vinoth, Ganapathiraman (Department of Civil Engineering, The University of British Columbia) ;
  • Moon, Juhyuk (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Ku, Taeseo (Department of Civil and Environmental Engineering, National University of Singapore)
  • Received : 2019.11.22
  • Accepted : 2020.04.14
  • Published : 2020.06.10
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Abstract

Hydraulic conductivity is one of the engineering properties of soil. This study focusses on the influence of cement content on the hydraulic conductivity of cemented sand, which is investigated based on the results from numerical analysis and laboratory testing. For numerical analysis the cemented samples were scanned using X-ray Computed Tomography (CT) while laboratory testing was carried out using a triaxial setup. Numerical analysis enables us to simulate flow through the sample and provides insight to the microstructure. It quantifies the pore volume, proportion of interconnected voids and pore size distribution in both cemented and uncemented samples, which could be computed only through empirical equations in case of laboratory testing. With reduction in global voids, the interconnecting voids within the samples also reduce with cement content. Gamma cumulative distribution function is used to predict the percentage of voids lesser than a given pore volume. Finally, the results obtained from both numerical analysis and laboratory testing are compared.

Keywords

Acknowledgement

This research was supported by the Singapore Ministry of Education (MOE).

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