An elastoplastic mechanical constitutive model for microbially mediated cemented soils

Gai, Xuerui; Sánchez, Marcelo

doi:10.1007/s11440-018-0721-y

Cited by 42 publications

(32 citation statements)

References 68 publications

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“…Constitutive models are being developed and implemented for the prediction of the soil-cement and stress-strain behaviour of MICP-treated soils [29,[38][39][40]46]. Discrete element method (DEM) simulations of MICP-cemented sand have been used to evaluate the micro-scale behaviour of the sand-CaCO 3 bond [47][48][49][50].…”

Section: Historical Development Of Micpmentioning

confidence: 99%

“…Despite numerous studies conducted, limited attention has been paid to the constitutive behaviour of MICP-treated soils. Several constitutive models can be found in the literature that have been developed for cemented soils [46,[125][126][127][128][129][130][131][132][133][134]. However, only in a very limited number of cases have the models been either developed or validated specifically for MICP-treated soils.…”

Section: Constitutive Modellingmentioning

confidence: 99%

“…An elastoplastic constitutive model for MICP-cemented soils was recently developed by Gai and Sánchez [46]. The mechanism for MICP soil enhancement was captured using a critical state yield surface and sub-loading concepts, while the bonding degradation effects under shear were captured using an evolution law.…”

Section: Constitutive Modellingmentioning

confidence: 99%

“…where dε is the total strain increament, D is the elastoplastic stiffness matrix and D mc is associated with changes in the CaCO 3 content. The experimental data (from Cui et al [105]) and model prediction (from Gai and Sánchez [46]) of the stress-strain and volumetric responses for the MICP-treated and untreated specimens are presented in Figure 15a,b respectively. The overall response of both untreated and treated soils shows a dominant dilative volume change behaviour, which becomes more pronounced with an increase in C C .…”

Section: Constitutive Modellingmentioning

confidence: 99%

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State-of-the-Art Review of Microbial-Induced Calcite Precipitation and Its Sustainability in Engineering Applications

et al. 2020

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Microbial-induced calcite precipitation (MICP) is a promising new technology in the area of Civil Engineering with potential to become a cost-effective, environmentally friendly and sustainable solution to many problems such as ground improvement, liquefaction remediation, enhancing properties of concrete and so forth. This paper reviews the research and developments over the past 25 years since the first reported application of MICP in 1995. Historical developments in the area, the biological processes involved, the behaviour of improved soils, developments in modelling the behaviour of treated soil and the challenges associated are discussed with a focus on the geotechnical aspects of the problem. The paper also presents an assessment of cost and environmental benefits tied with three application scenarios in pavement construction. It is understood for some applications that at this stage, MICP may not be a cost-effective or even environmentally friendly solution; however, following the latest developments, MICP has the potential to become one.

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Section: Historical Development Of Micpmentioning

confidence: 99%

Section: Constitutive Modellingmentioning

confidence: 99%

Section: Constitutive Modellingmentioning

confidence: 99%

Section: Constitutive Modellingmentioning

confidence: 99%

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State-of-the-Art Review of Microbial-Induced Calcite Precipitation and Its Sustainability in Engineering Applications

et al. 2020

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“…Lots of research have been carried out using this technique, the majority of which at the laboratory scale, in columns (several centimetres to metres) (Mirmohammad Sadeghi et al, 2015;Rowshanbakht et al, 2016;Zhao et al, 2014). A few researchers carried out large-scale in-situ tests (Esnault Filet et al, 2019;Gomez et al, 2015Gomez et al, , 2017van Paassen et al, 2010); some others set up comprehensive models (Barkouki et al, 2011;Fauriel & Laloui, 2012;Gai & S anchez, 2019;Mahanty et al, 2014) or carried out microscopic visualisation of the fabric of cemented soils (Li et al, 2017;Terzis & Laloui, 2019). This research on MICP in geotechnical field mainly concerned the following aspects: (1) exploring the mechanisms to optimize the effectiveness of soil bio-cementation through the study of different factors, (2) measuring the properties (especially the mechanical properties) of bio-cemented soils.…”

Section: Introductionmentioning

confidence: 99%

Optimizing protocols for microbial induced calcite precipitation (MICP) for soil improvement–a review

Tong

Souli

Péchaud

et al. 2020

European Journal of Environmental and Civil Engineering

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With the fast-developing bioengineering techniques in recent decades, researchers have started to try to apply bio-techniques to geotechnical engineering. Microbial induced calcite precipitation (MICP) has known a mushroom growth, due to its sustainability and feasibility. In order to achieve lower cost, higher efficiency and higher operational feasibility, many studies have been carried out to optimise the protocols. It is crucial to review the existing literature to give a synthetic summary of the optimised conditions in the various protocols. This article assembled, analysed and summarised the results of studies on the optimisation of protocols in state-of-the-art literature. The main factors incorporating biological, physical, chemical and operational aspects, were presented in this article. It can provide a clear insight in how these factors are acting on the process. Upto-date instructions on the selection of parameters can inspire further studies.

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3D DEM modeling of biocemented sand with fines as cementing agents

Liang

et al. 2022

Num Anal Meth Geomechanics

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Microbially induced calcium carbonate precipitation (MICP) has attracted much attention as a promising green technique for soil improvement. Despite the significance of precipitation pattern in mind, constitutive relations or numerical models considering the finite-strain mechanical effects of the various precipitation patterns are rarely developed. In this paper, we propose a novel 3D DEM modeling scheme by using coarse particles to represent sand grains and fines as cementing agents, to reproduce the various precipitation patterns in MICPtreated sand. Based on the topological relations with adjacent particles and the contribution to the mechanical improvement, the cementing fines are classified into effective, partially effective, surface coating, and pore filling ones. The microstructural characteristics and their evolution upon external loading are investigated quantitatively after a careful calibration and validation. The microstructural variation in experiments can be well reproduced, pinpointing this variation as a possible cause for the fluctuation in experimental data. Massive coating fines are produced accompanying the microstructural degradation, which is initiated by the breakage of effective bonds. The breakage of partially effective bonds may become dominating later in the medium to strong cemented specimens. One weakly cemented specimen shows diffuse failure with simultaneous bond-breakage and friction. In contrast, the medium to strong cemented specimens show localized failure with the dominating mechanism transiting from bond-breakage to friction producing notable pore filling fines. We propose a relation between unconfined compressive strength and the equivalent effective volume fraction of cementing agents normalized by the pretreatment porosity, which reveals the coupling effects of the initial configuration and the precipitation pattern on the mechanical improvement.

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An elastoplastic mechanical constitutive model for microbially mediated cemented soils

Cited by 42 publications

References 68 publications

State-of-the-Art Review of Microbial-Induced Calcite Precipitation and Its Sustainability in Engineering Applications

State-of-the-Art Review of Microbial-Induced Calcite Precipitation and Its Sustainability in Engineering Applications

Optimizing protocols for microbial induced calcite precipitation (MICP) for soil improvement–a review

3D DEM modeling of biocemented sand with fines as cementing agents

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