Numerical investigation of pile installation effects in sand using material point method

Phuong, Nguyen Thi; Tol, A.F. van; Elkadi, A. S.; Rohe, Alexander

doi:10.1016/j.compgeo.2015.11.012

Cited by 96 publications

(27 citation statements)

References 32 publications

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“…In addition, the materials used in this method like bentonite intensify the looseness. These two methods of installation have different effects on interaction factor [19][20]. In these experiments, none of these conditions was exactly dominated since piles initially were set.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation on Efficiency Factor of Pile Groups Regarding Distance of Piles

Pashayan

Moradi

2019

Civ Eng J

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There are a lot of the parameters which affect pile group behavior in soil. One of these factors is the distance of piles from each other. The impact of distance on pile groups in sand has been investigated through some researches, whereas most of them have not represented an exact estimation according to the continuous change of the distance in sand. Moreover, most of previous investigations have considered two piles as a perfect group. Since two-pile group has the least interaction effect among piles, it cannot suitably demonstrate the influence of spacing. In this lecture, several 4-pile groups modeled with different spacing were subjected to axial loading in laboratory. The pile groups were free-head with length to diameter ratio of 13.5. The piles are designed in a way which the shaft resistance of piles can be completely mobilized through the test. Then, the bearing capacities of pile groups are measured and compared with the single pile's resistance in order to calculate the efficiency coefficient of the groups. It is revealed that the distance is noticeably effective in efficiency factor and this effectiveness, non-linearly decreases by increase of spacing. The results show that the efficiency coefficient is changing between almost 1 and 1.4.

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Section: Resultsmentioning

confidence: 99%

Experimental Investigation on Efficiency Factor of Pile Groups Regarding Distance of Piles

Pashayan

Moradi

2019

Civ Eng J

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“…In order to keep the fine mesh always around the plate, a moving mesh approach is applied (Beuth, 2012;Phuong et al, 2016). It consists in adjusting the mesh with the movement of the plate.…”

Section: The Numerical Modelmentioning

confidence: 99%

“…Since the large soil-plate displacements cannot be captured with the standard Lagrangian FEM because of issues with element distortions, Arbitrary Lagrangian-Eulerian methods (ALE) and particle-based methods have been developed in the last few decades (Atluri & Zhu, 2000;Donea & Huerta, 2004). Among them, the remeshing and interpolation technique with small strain (RITSS) method (Hu & Randolph, 1998), the coupled Eulerian-Lagrangian (CEL) method (Grabe, Qiu, & Wu, 2015;Qiu, Henke, & Grabe, 2011), and the Material Point Method (MPM) (Sulsky, Chen, & Schreyer, 1994) have been successfully applied in soil penetration problems similar to the anchor pull out discussed in this paper Mahmoodzadeh & Randolph, 2014;Phuong, van Tol, Elkadi, & Rohe, 2016;Tian, Cassidy, Randolph, Wang, & Gaudin, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The numerical analyses are performed using the dynamic explicit code Anura3D (www.anura3d.eu), which implements a full 3D MPM formulation and it is therefore suitable to simulate the three-dimensional soil deformations induced by the movement of the plate. It implements an enhanced version of the original MPM proposed by Sulsky, Chen, & Schreyer, (1994), which has been extensively validated for geomechanical problems (Al-Kafaji, 2013;Yerro, 2015) including slope failures (Soga, Alonso, Yerro, Kumar, & Bandara, 2016;Yerro, Alonso, & Pinyol, 2016) and soil penetration problems Ceccato, Beuth, Vermeer, & Simonini, 2016;Phuong et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Large displacement numerical study of 3D plate anchors

Ceccato

Bisson

Cola

2017

European Journal of Environmental and Civil Engineering

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This paper presents a numerical study carried out in the context of the development of a new application of plate anchors for landslide stabilization. The plates are positioned on the slope's ground surface and linked to a deeper stable layer with a steel grouted bar, thus acting as discontinuous elements constrasting the slope movement. This technique is less expensive compared to standard retaining structures, especially in medium and deep landslides. Moreover, plate anchors can bear large displacements of the unstable moving mass without losing efficiency. Evaluating the stabilizing force and its optimization in relation to the plate shape are of great interest. Numerous studies have investigated the bearing capacity of rectangular and circular thin plates at small strains, but the performance of alternative shapes, such as cones or truncated cones, has never been considered. The numerical study here presented applies the Material Point Method to investigate the behaviour of plate anchors with different 3D shapes at large displacements. The numerical model is validated with the results of some smallscale laboratory tests. The pull-out resistance, the soil stress and displacement fields around the plate, and the group effect have been investigated, thus obtaining preliminary indications for the design of these elements.

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“…(3) Remap information (4) Reset grid, advance timestep This numerical method is used for a wide array of applications. In the geoengineering field, landslide analysis (Andersen & Andersen, 2010), cracks propagation (Chen & al., 2002), pile driving (Phuong & al., 2016), multi-phase soil mechanics , erosion and fluid-structure interaction (Onate & al., 2008;Parker & al., 2006) are some examples of problems that were tackled with the MPM. These developments were made possible by the fact that MPM overcomes some of the downfalls on traditional FEM analysis.…”

Section: Points Gridmentioning

confidence: 99%

Field Scale Flow Modeling of Thixotropic Mine Tailings Using the Material Point Method

Parent¹

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Understanding free surface flow of mine tailings is necessary to plan deposition operations in tailings' storage facilities (TSF), and is important to predict the consequences of a dam break. Proper understanding of deposition operations has probably hindered adoption of alternative tailings technologies, wheras recent failures of tailings impoundments have had catastrophic consequences. Flow behavior is crucial to understand for effective risk mitigation. Tailings exhibit thixotropic properties-their behavior is a function of the material's stress history. A thixotropic constitutive model has been implemented into an open-source Material Point Method (MPM) framework. The results were validated with previous experimental data at laboratory scale and compared with Bingham rheology with good agreements. Large-scale simulations were done for 2D and 3D cases. The thixotropic model was able to model self-forming channels seen during field scale deposition, which Bingham rheology is unable to capture. Dam break events also scaled differently from laboratory scale experiments with thixotropy. This can possibly be an element that explains longer runouts then initially predicted with standard rheology.

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Numerical investigation of pile installation effects in sand using material point method

Cited by 96 publications

References 32 publications

Experimental Investigation on Efficiency Factor of Pile Groups Regarding Distance of Piles

Experimental Investigation on Efficiency Factor of Pile Groups Regarding Distance of Piles

Large displacement numerical study of 3D plate anchors

Field Scale Flow Modeling of Thixotropic Mine Tailings Using the Material Point Method

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