CFD-DEM simulation of microbially treated sands under undrained consolidated cyclic triaxial tests

JIANG Ming-jing; SUN Ruo-han; LI Tao; YANG Tao; TAN Ya-fei-ou

doi:10.11779/CJGE202001002

Volume 42 Issue 1

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Chinese Journal of Geotechnical Engineering > 2020 > 42(1): 20-28. > DOI: 10.11779/CJGE202001002

JIANG Ming-jing, SUN Ruo-han, LI Tao, YANG Tao, TAN Ya-fei-ou. CFD-DEM simulation of microbially treated sands under undrained consolidated cyclic triaxial tests[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(1): 20-28. DOI: 10.11779/CJGE202001002

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CFD-DEM simulation of microbially treated sands under undrained consolidated cyclic triaxial tests

JIANG Ming-jing^{1, 2, 3, 4, 5,},
SUN Ruo-han^{1, 2},
LI Tao^{1, 2},
YANG Tao⁵,
TAN Ya-fei-ou⁵

1.
Department of Civil Engineering, School of Civil Engineering, Tianjin University, Tianjin 300072, China
2.
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
3.
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
4.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
5.
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

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Received Date: March 11, 2019
Available Online: December 07, 2022

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Abstract

The microbially induced calcite precipitation is a promising technology to improve ground, and the treated soil can be regarded as the structural one. In this study, firstly, based on the three-dimensional (3D) contact model for granulates incorporating rolling and twisting resistances and 3D bonds failure criteria, and considering both the slight plastic deformation of particles during collisions and the rate-dependency, a cyclic bonded contact model is established. A time-dependent relationship is then proposed to describe the denitrification reaction in reinforced sand. Next, the mechanical responses of microbially treated sands at different cementation and bubble contents are investigated by the coupled CFD-DEM in undrained-consolidated cyclic triaxial tests. The effects of biological bond and biological bubbles on the liquefaction resistance of sands are analyzed in link with the mechanism from macroscopic and microscopic scales. The results show that the coexistence of cementation and bubble does not increase the liquefaction resistance as expected in the form of "1+1=2". The presence of cementation enhances the liquefaction resistance of unsaturated sands evidenced by the decrease of excess pore water pressure ratio and axial strain, and the increase of coordination number. However, the presence of bubbles reduces the liquefaction resistance of cemented sands, where the number of cycles to the initial liquefaction decreases, the axial strain increases significantly in the tensile direction, and the coordination number decreases significantly.

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