Behavior of an Atypical Embankment on Soft Soil: Field Observations and Numerical Simulation

Oliveira, Paulo J. Venda; Lemos, Luís; Coelho, Paulo

doi:10.1061/(asce)gt.1943-5606.0000183

Cited by 31 publications

(6 citation statements)

References 11 publications

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“…This study was carried out using a Portuguese soft soil, from the "Baixo Mondego" area, located in the centre of Portugal. The soil was collected from one site and depth (2.5 m), with the purpose of reducing the soil's natural inherent variability (Coelho, 2000;Venda Oliveira et al, 2010). The natural soil has a predominantly silty grain size distribution (sand ¼ 14%; silt ¼ 61%; clay ¼ 25%), a low unit weight (14.6 kN/m 3 ), a high void ratio (>2.0) and a high natural water content (80.9%).…”

Section: Characteristics Of the Soft Soilmentioning

confidence: 99%

Effect of polypropylene fibres on the compressive and tensile strength of a soft soil, artificially stabilised with binders

Correia

Oliveira

Custódio³

2015

Geotextiles and Geomembranes

169

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This work studies the effect of binder and fibre quantity on the mechanical behaviour of "Baixo Mondego" soft soil, chemically stabilised with binders and reinforced/non-reinforced with short polypropylene fibres. The experimental programme was comprised by four types of tests, one to evaluate compressive strength (unconfined compressive strength test) and three to evaluate tensile strength (direct tensile strength test, split tensile strength test and flexural strength test). The results indicate that increases in binder content cause an increment in the stiffness, the compressive and tensile strength, but have a lower impact on the specimens reinforced with fibres. In general, the addition of a low quantity of fibres to the stabilised soft soil originates a decrease in the stiffness, compressive and direct tensile strength, a reduction of the loss of strength after peak and a change in behaviour, from brittle to more ductile. The results also reveal that the impact of the addition of fibres on the strength depends on the strain mechanism used in each test. Therefore, in flexural strength tests the impact of the fibres is significant, while in the direct tensile strength tests the inclusion of fibres has a negligible effect. Relationships between the compressive and tensile strength are presented at the end of this study, as well as between the tensile strengths evaluated from the direct tensile strength test, split tensile strength test and flexural strength test.

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Section: Characteristics Of the Soft Soilmentioning

confidence: 99%

Effect of polypropylene fibres on the compressive and tensile strength of a soft soil, artificially stabilised with binders

Correia

Oliveira

Custódio³

2015

Geotextiles and Geomembranes

169

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“…The Figure also reveals an excellent agreement between the numerical results obtained with this code and the analytical solution [27], which indicates a suitable reliability of the code. Additionally, the model was also used to simulate the behaviour of embankments on soft soils with very good results [22,23]. To account for the permeability anisotropy typical of sedimentary soils, a ratio of k h /k v equal to 3 was used, in accordance with the range observed in similar soils [31].…”

Section: Constitutive Modelsmentioning

confidence: 99%

“…It allows elastoplastic analyses to be carried out with coupled consolidation, creep phenomenon [21], geometric non-linearity [22], and incorporates several constitutive laws, such as Modified Cam Clay [23], Melanie [23], and Lade, MIT-E3 [24,25], among others. Table 1 Material properties used in numerical analysis -base problem (based on [6,29]).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of an embankment built on soft soil reinforced with deep mixing columns: Parametric study

Oliveira

Pinheiro

Correia

2011

Computers and Geotechnics

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“…The behavior response of soils is affected significantly by stress-induced anisotropy (Yildiz et al 2009;Atkinson et al 1990). Neglecting the effects of anisotropy may lead to inaccurate predictions of soft clay response (Karstunen, Koskinen 2008;Oliveira et al 2010;Taiebat, Dafalias 2010). Cam-clay model (Roscoe, Schofield 1963) is one of the most important models which were developed based on the critical state theory.…”

Section: Introductionmentioning

confidence: 99%

Comparison and Application of Different Elasto-Plastic Constitutive Models in Fem Analysis of an Excavated Soil Slope

Zhang

2012

Journal of Civil Engineering and Management

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A modified anisotropic elasto-plastic model is presented in this paper based on the frame work of Modified Cam-clay model and Original Sekiguchi-Ohta model by applying a new stress ratio parameter, through which the yield locus and hardening axis in the p-q plane were adjusted to give a more reasonable description of the practical excavation stress path from initial K0 state. Typical excavated soil slope was selected as the illustration example to carry out the finite element numerical analysis by applying four constitutive models (Original Cam-Clay, Modified Cam-Clay, Original Sekiguchi-Ohta and Modified Sekiguchi-Ohta). The calculated displacements of the slope with above different constitutive models were then compared with the measured infield data. It was found the field measured data agree better with the results calculated from modified model, which indicates that the modified anisotropic model is more suitable in the description of the stress path of excavated soils slope after K0 consolidation.

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Behavior of an Atypical Embankment on Soft Soil: Field Observations and Numerical Simulation

Cited by 31 publications

References 11 publications

Effect of polypropylene fibres on the compressive and tensile strength of a soft soil, artificially stabilised with binders

Effect of polypropylene fibres on the compressive and tensile strength of a soft soil, artificially stabilised with binders

Numerical analysis of an embankment built on soft soil reinforced with deep mixing columns: Parametric study

Comparison and Application of Different Elasto-Plastic Constitutive Models in Fem Analysis of an Excavated Soil Slope

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