DEM of triaxial tests on crushable cemented sand

Bono, John P. de; McDowell, G. R.; Wanatowski, Dariusz

doi:10.1007/s10035-014-0502-8

Cited by 48 publications

(15 citation statements)

References 36 publications

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“…Aursudkij et al [6] also performed large scale triaxial tests on limestone particles under confining stresses of 10, 30 and 60 kPa and the sample with lowest confining stress was found to give the largest amount of dilation but the smallest amount of breakage. Additionally, as a powerful numerical tool to understand the micromechanical behaviour of granular material, the discrete element method (DEM) [10] has shown some success in simulating triaxial tests on granular materials [11][12][13][14][15][16][17][18][19]. However, it is a challenge to consider both irregular particle shape and ballast degradation in DEM modelling of railway ballast; e.g.…”

Section: Introductionmentioning

confidence: 99%

Discrete element modelling of scaled railway ballast under triaxial conditions

McDowell

2016

Granular Matter

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The aim of this study is to demonstrate the use of tetrahedral clumps to model scaled railway ballast using the discrete element method (DEM). In experimental triaxial tests, the peak friction angles for scaled ballast are less sensitive to the confining pressure when compared to fullsized ballast. This is presumed to be due to the size effect on particle strength, whereby smaller particles are statistically stronger and exhibit less abrasion. To investigate this in DEM, the ballast is modelled using clumps with breakable asperities to produce the correct volumetric deformation. The effects of the quantity and properties of these asperities are investigated, and it is shown that the strength affects the macroscopic shear strength at both high and low confining pressures, while the effects of the number of asperities diminishes with increasing confining pressure due to asperity breakage. It is also shown that changing the number of asperities only affects the peak friction angle but not the ultimate friction angle by comparing the angles of repose of samples with different numbers of asperities.

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Section: Introductionmentioning

confidence: 99%

Discrete element modelling of scaled railway ballast under triaxial conditions

McDowell

2016

Granular Matter

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“…de Bono et al studied the effect of cementation on the degree of crushing using the discrete element method. It was shown that in the cemented material, an increase in the degree of crushing was observed with increasing cement content [22]. Shen et al were developed a three-dimensional bonded contact model to simulate the mechanical behavior of bonded granular material using the DEM.…”

Section: Distinct Element Methodsmentioning

confidence: 99%

Numerical analysis of ground improvement effects on dynamic settlement of uniform sand using DEM

Ahmadi

Sizkow

2020

SN Appl. Sci.

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Uniform fine sands are recognized as problematic soils which are highly prone to earthquake or dynamic loads effects. Cyclic and dynamic loads on such soils can destroy its structure and cause them to experience high volume change. In loose sands, volume change originated from dynamic or cyclic loadings (caused by earthquake, machineries or other similar sources) can lead to excessive settlements on the ground surface which in turn endangers the structural integrity and performance of the superstructure. As a consequence, it is important to perform soil improvements prior to putting any foundation on them. Among many known and recently developed techniques, the soil compaction (or densification) and cement injection are the widest techniques in fine sands improvement. In this research, a numerical study is employed which incorporates the distinct elements method to investigate the volume change and settlement of uniform fine sands. The results obtained numerically have been compared with those observed in a laminar shear box physical model of samples of fine sand. A surface footing is placed over the top of the specimen in the shear box which is modeled by a small rigid plate. Comparisons indicate that the applied simulation technique is suitable for the soil under study. To simulate the model and for verification purpose, Anzali sand physical and mechanical properties have been implemented. Soil particles in the discrete elements technique were modeled by spherical particles obeying the Anzali sand grain size distribution, and for the surface footing, rigid clumps of particles were used. Experiments were performed for density indices of 30-88%, and numerical simulations by the discrete elements method were performed at porosities of 0.43-0.38. The trend of dynamic settlement over the cyclic loading shows a good agreement with measured data in the laboratory. Results revealed that the improvement techniques such as compaction and cementation have a significant effect on the reduction in the final settlement under applied dynamic loads.

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“…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%

“…In general, DEM modelling of chemically cemented soils (e.g., Portland cement) has been investigated by several researchers [140][141][142][143][144][145][146]. Some studies have attempted to also model the micro-scale behaviour of MICP-cemented soils using DEM [47][48][49][50].…”

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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DEM of triaxial tests on crushable cemented sand

Cited by 48 publications

References 36 publications

Discrete element modelling of scaled railway ballast under triaxial conditions

Discrete element modelling of scaled railway ballast under triaxial conditions

Numerical analysis of ground improvement effects on dynamic settlement of uniform sand using DEM

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

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