Elastoplastic constitutive model for biocemented sands

CUI Hao; XIAO Yang; SUN Zeng-chun; WANG Cheng-gui; LIANG Fang; LIU Han-long

doi:10.11779/CJGE202203009

Volume 44 Issue 3

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Chinese Journal of Geotechnical Engineering > 2022 > 44(3): 474-482. > DOI: 10.11779/CJGE202203009

CUI Hao, XIAO Yang, SUN Zeng-chun, WANG Cheng-gui, LIANG Fang, LIU Han-long. Elastoplastic constitutive model for biocemented sands[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(3): 474-482. DOI: 10.11779/CJGE202203009

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Elastoplastic constitutive model for biocemented sands

CUI Hao^1,,
XIAO Yang^{1, 2, 3, ,},
SUN Zeng-chun¹,
WANG Cheng-gui¹,
LIANG Fang¹,
LIU Han-long^{1, 2, 3}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China
3.
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, China

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Received Date: April 29, 2021
Available Online: September 22, 2022

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Abstract

Abstract

The microbial-induced calcite precipitation (MICP) is a new method for reinforcing geotechnical materials with environmentally friendly bacteria. The test results show that the stiffness, strength and dilatancy of the MICP-treated sands are enhanced, while the compressibility is reduced. In view of the mechanical properties and deformation characteristics of the MICP-treated sands, a state-dependent elastoplastic constitutive model for the MICP-treated sands with non-associated flow rule is established in the framework of critical state soil mechanics theory. In the new cementation degradation rule, the cementation degradation rate is related to the accumulation of plastic strain and the confining pressure. Then, the drained triaxial tests on the MICP-treated sands are simulated by the proposed model. The results show that the proposed model can well simulate the stress-strain relationship and dilatancy behavior.
- MICP-treated sand,
- state parameter,
- cementation,
- degradation,
- constitutive model

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