Behaviour of clay treated with cement &amp; fibre while capturing cementation degradation and fibre failure – C3F Model

Nguyen, Lam; Fatahi, Behzad

doi:10.1016/j.ijplas.2016.01.015

Cited by 55 publications

(14 citation statements)

References 72 publications

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“…In another study, Nguyen and Fatahi (2016) reported the mechanical behaviour of fibre-reinforced cemented clay with polypropylene fibres using a series of consolidated undrained triaxial tests. They also developed a constitutive model called C3F based on Modified Cam Clay (MCC) model to predict the shear strength of fibre-reinforced clays with and without cementation.…”

Section: Validation Of the Modelmentioning

confidence: 99%

“…There are also several statistical models to predict the shear strength of fibrereinforced granular soils (Ranjan et al 1996;Babu and Vasudevan 2008) with input parameters including some or any of the following: fibre content, fibre aspect ratio, fibre surface friction, confining pressure, fibre length, cohesion and internal friction angle of the fibre-reinforced soil. Cam Clay constitutive model has also been reformulated to account for the estimation of the deviator stress of fibre-reinforced clays (Chen 2007;Babu and Chouksey 2010;Ibraim 2014 andNguyen andFatahi 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Experimental and predicted data for shear strength response of fibre-reinforced soil(Ozkul and Baykal, 2007) Experimental and predicted data for shear strength response of fibre-reinforced soil(Nguyen and Fatahi 2016) …”

mentioning

confidence: 99%

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Practical approach to predict the shear strength of fibre-reinforced clay

Mirzababaei

Mohamed

Arulrajah

et al. 2018

Geosynthetics International

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to 5% carpet waste fibres. The results indicated that carpet waste fibres improve the effective shear stress ratio and 5 deviator stress of the host soil significantly. Addition of 1%, 3% and 5% carpet fibres could improve the effective 6 stress ratio of the unreinforced soil by 17.6%, 53.5% and 70.6%, respectively at an initial effective consolidation 7 stress of 200 kPa. In this study, a nonlinear regression model was developed based on a modified form of the 8 hyperbolic model to predict the relationship between effective shear stress ratio, deviator stress and axial strain of 9 fibre-reinforced soil samples with various fibre contents when subjected to various initial effective consolidation 10 stresses. The proposed model was validated using the published experimental data, with predictions using this model 11 found to be in excellent agreement. 12 13

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Section: Validation Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Practical approach to predict the shear strength of fibre-reinforced clay

Mirzababaei

Mohamed

Arulrajah

et al. 2018

Geosynthetics International

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show abstract

“…It is difficult to analyze the influence of excavation of foundation pits on surrounding environment in soft soil reasonably by traditional analytical methods and relevant normative methods [1,2]. e numerical analysis method has become the most effective method for excavation of foundation pits in soft soil because it can take into account the stratification and nature of soil, distribution and nature of support systems, construction process of excavation and support structures, and influence on surrounding environment [7][8][9][10]. e key point in numerical simulation is to adopt reasonable calculation parameters and constitutive models.…”

Section: Introductionmentioning

confidence: 99%

Parameter Analysis on Hardening Soil Model of Soft Soil for Foundation Pits Based on Shear Rates in Shenzhen Bay, China

Zhang

et al. 2020

Advances in Materials Science and Engineering

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The hardening soil (HS) model is the most commonly used constitutive models of soft soil of foundation pits of PLAXIS software in numerical analysis, and its parameters are prerequisite for accurate calculation. In this paper, relevant parameters of the HS model in Shenzhen Bay in China were studied through one-dimensional consolidation tests and triaxial shear tests. Analytical methods of reference secant stiffness and failure ratio of soft soil were systematically studied, the influence of shear rates on reference secant stiffness and failure ratio of soft soil was analyzed, and the relationship between stiffness parameters and compressive modulus of soft soil was established. The results showed that reference secant stiffness and failure ratio of soft soil obtained by different analytical methods were quite different, and the errors of reference secant stiffness and failure ratio of soft soil obtained by stress-strain curves were the smallest and the stability was the best; at the same time, with increase of shear rates, the peak deviator stress and reference secant stiffness of soft soil increased, but failure ratio did not change much. The research results could provide a reference of parameter analysis of soft soil for the HS model in the numerical analysis and similar working conditions of foundation pits.

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“…The use of carpet and steel fibers can effectively increase the tensile strength, while almost no influence was found for polypropylene fibers (Fatahi et al, 2013). In these tests, the characteristics of cementation bond breakage and fiber rupture can be analysed effectively by a non-linear constitutive model, as reported in Nguyen and Fatahi (2016).…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Shear Behavior of Fiber-Reinforced Calcareous Sands

et al. 2018

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Fiber-reinforced calcareous sands manifest unique properties of increased shear strength and particle breakage. These features are of practical importance for some offshore engineering constructions because the strength improvement and efficient dense compaction of soils are both important. This paper presents the experimental evaluations on the characteristics of shear strength and particle breakage of fiber-reinforced calcareous sands by direct shear and ring shear tests with different vertical loading stress, fiber content and fiber length. In the tests, the mixture of fiber and sands can make the specimen a spatially interlocked and unitary coherent network, with efficient stress transmission. In addition, the overall deformation of sand specimen would increase with the fiber content due to low stiffness of fiber elements. Thus, in direct shear tests, the secant elastic modulus decreased, while the shear strength increased with the fiber content. The contribution of fiber elements to the shear strength of sand specimen came mainly from the friction and tension forces exerted when they were deformed. These two types of force could mobilize the additional shear resistance of sands, and thus increase the overall shear strength of the sample. In ring shear tests, the breakage intensity of calcareous sands increased with the vertical loading stress, fiber content and fiber length. At low fiber content and length, the inter-particle contacts and interlocking effects influenced the shear strength and particle breakage significantly, while at higher fiber content, the role of fiber friction and tension forces became dominant.

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Behaviour of clay treated with cement & fibre while capturing cementation degradation and fibre failure – C3F Model

Cited by 55 publications

References 72 publications

Practical approach to predict the shear strength of fibre-reinforced clay

Practical approach to predict the shear strength of fibre-reinforced clay

Parameter Analysis on Hardening Soil Model of Soft Soil for Foundation Pits Based on Shear Rates in Shenzhen Bay, China

Experimental Evaluation of the Shear Behavior of Fiber-Reinforced Calcareous Sands

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