Simulating mechanical response in bio-cemented sands

Evans, T. Matthew; Khoubani, Ali; Montoya, Brina M.

doi:10.1201/b17435-277

Cited by 19 publications

(13 citation statements)

References 2 publications

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“…where V CaCO 3 is the total volume of calcium carbonate accumulated in the material (cm 3 ) and V is the pore volume in the uncemented sand (cm 3 ). e total volume of calcium carbonate, V CaCO 3 , was calculated as 2…”

Section: Methods For Determining the Composition Content Of Mcs Matermentioning

confidence: 99%

“…However, for the numerical simulation of cemented materials under the action of microorganisms, there is relatively little literature to draw on. Evans and Khoubani [3,4] developed novel methods to reduce the complexity of bonded particle systems, which provide inspiration to analyse such systems through numerical simulation. Wang [5] analysed the mechanical characteristics of artificial cemented sand from which the strong mechanical strength of cemented sand was attributed to the formation of stable force chains in the material structure.…”

Section: Introductionmentioning

confidence: 99%

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Research on Simulation Analysis Method of Microbial Cemented Sand Based on Discrete Element Method

Tang

Lian

et al. 2019

Advances in Materials Science and Engineering

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A simulation method for microbial cemented sand (MCS) based on the Two-Dimensional Particle Flow Code (PFC 2D) has been developed in this study. It consists of an identification of mesoscopic contact model for structural mesoscopic particles, development of morphological algorithm for irregular crystal particles, and classification and setting of mesoscopic parameters for compositional materials and particle size distribution simulation. Additionally, an acoustic emission algorithm based on moment tensor theory was developed for discrete element simulation analysis on fracture characteristic of cemented sand under the action of the force. e simulation method proposed in this article/paper may reflect the physical and mechanical characteristics of real microbial cemented sand based on physical experiments. Quantification of the fracture process of microbial cemented sand is possible by introducing a moment magnitude (MW) in discrete element simulation analysis. e material may have greater probability of fracture between the MW ranges of −6.8 and −6.6. e relationship between probability of fracture at different MWs and the MW follows the Gaussian curve. e research results are a new trial for fracture analysis on microbial cemented sand.

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Section: Methods For Determining the Composition Content Of Mcs Matermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Simulation Analysis Method of Microbial Cemented Sand Based on Discrete Element Method

Tang

Lian

et al. 2019

Advances in Materials Science and Engineering

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“…Fauriel & Laloui (2012) implemented a theoretical model to capture the performance of bio-improved soils by extending the constitutive concept that was developed for aggregated soils by Koliji et al (2012) to account for the effects of bonding and density change. Numerical studies (Wang & Leung, 2008;Evans et al, 2015;Jiang et al, 2014) that implemented the discrete-element method also aimed at predicting the behaviour of cemented soils by reproducing the packing structure composed of soil and bonding particles, where the position and arrangement of the latter ultimately affect the distribution of the interparticle forces.…”

Section: Introductionmentioning

confidence: 99%

Fabric characteristics and mechanical response of bio-improved sand to various treatment conditions

Terzis

Bernier‐Latmani

Laloui

2016

Géotechnique Letters

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Investigation of the enhanced mechanical response of treated soils through microbially induced calcite precipitation requires extensive understanding of the pore structure. Depending on the applied treatment conditions, the resultant material exhibits distinct changes in the solid phase. In this paper, the focus is on the microstructural characteristics of bio-cemented soils derived from different treatment patterns. The objective is to clarify the predominant fabric features as a function of the adopted treatment conditions. For this purpose, microstructural observations with scanning electron microscopy are used to analyse the structure during the treatment and post-treatment. Mesocrystalsthat is, aggregates of single particlesare identified as a distinct form of precipitate that provides the crucial grain-to-grain contact surfaces. The cemented samples are subsequently subjected to undrained triaxial shear test to investigate the response in three typical cases of bio-cemented samples produced under laboratory conditions: (a) one of very low calcite content (2•5% w/w), (b) one with inhomogeneous distribution of calcite and (c) for the case of homogeneously distributed calcite mass. Improved characteristics are obtained in all three cases. KEYWORDS: fabric/structure of soils; failure; ground improvement ICE Publishing: all rights reserved NOTATION c′ cohesion (kPa) E precipitation efficiency (%) E ur unloading-reloading Young's modulus (MPa) e 0 initial void ratio OD 600 optical density measured at 600 nm p′ mean effective stress (kPa) q deviatoric stress (kPa) ε 1 axial strain (%) σ c confining pressure (kPa) φ′ friction angle (deg) Ω saturation index Ø grain diameter (mm)

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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%

“…Different contact bond models have been proposed in an attempt to simulate the behaviour of the bond that exists between the cemented material and the soil particles. Examples of contact bond models used to simulate the behaviour of MICP-cemented soils include the parallel bond model (PBM) [49, 50, 143-145, 149, 150], the beam model (BM) [147], the cement ring bond model (CRBM) [47,48,143,144,151], the cohesive bond model (CBM) [152,153] and the serial bond model (SBM) [146].…”

Section: Dem Modellingmentioning

confidence: 99%

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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Simulating mechanical response in bio-cemented sands

Cited by 19 publications

References 2 publications

Research on Simulation Analysis Method of Microbial Cemented Sand Based on Discrete Element Method

Research on Simulation Analysis Method of Microbial Cemented Sand Based on Discrete Element Method

Fabric characteristics and mechanical response of bio-improved sand to various treatment conditions

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

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