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2019 Vol.29, Issue 4 Preview Page

Research Article

Mechanical Behaviour of Bio-grouted Coarse-grained Soil: Discrete Element Modelling
Chuangzhou Wu1
,
Bo-An Jang2*
,
Hyun-Sic Jang1
1Senior Researcher, Department of Geophysics, Kangwon National University
2Professor, Department of Geophysics, Kangwon National University
*Corresponding Author
31 December 2019. pp. 383-391
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Abstract

Bio-grouting based on microbial-induced calcite precipitation (MICP) is recently emerging as a novel and environmentally friendly technique for improvement of coarse-grained ground. To date, the mechanical behaviour of bio-grouted coarse-grained soil with different calcite contents and grain sizes still remains poorly understood. The primary objective of this study is to investigate the influence of calcite content on the mechanical properties of bio-grouted coarse-grained soil with different grain sizes. This is achieved through an integrated study of uniaxial loading experiments of bio-grouted coarse-grained soil, 3D digitization of the grains in conjunction with discrete element modelling (DEM). In the DEM model, aggregates were represented by clump logic based on the 3D morphology digitization of the typical coarse-grained aggregates while the CaCO3 was represented by small-sized bonded particle model. The computed stress-strain relations and failure patterns of the bio-grouted coarse-grained soil were validated against the measured results. Both experimental and numerical investigation suggest that aggregate sizes and calcite content significantly influence the mechanical behaviour of bio-cemented aggregates. The strength of the bio-grouted coarse-grained soil increases linearly with calcite content, but decreases non-linearly with the increasing particle size for all calcite contents. The experimental-based DEM approach developed in this study also offers an optional avenue for the exploring of micro-mechanisms contributing to the mechanical response of bio-grouted coarse-grained soils.

Keywords
bio-cementation
coarse aggregates
size effect
uni-axial test
discrete element method
3D morphology digitization

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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 29
  • No :4
  • Pages :383-391
  • Received Date : 2019-11-04
  • Accepted Date : 2019-12-03
  • DOI :https://doi.org/10.9720/kseg.2019.4.383
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