A numerical comparison of installation sequences of plain concrete rigid inclusions

Nguyen, Huu Hung; Khabbaz, Hadi; Fatahi, Behzad

doi:10.1016/j.compgeo.2018.09.001

Cited by 11 publications

(10 citation statements)

References 74 publications

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“…CMCs are formed on the ground using a displacement auger that laterally displaces the surrounding soil and subsequently injects grout at low pressure through the hollow stem of the drilling tool while withdrawing the auger. During CMC installation, radial soil displacements around the auger increase stresses on the ground, enhancing the load-bearing capacity of the CMC [1][2][3][4][5]. In addition, the engineering properties of the surrounding soil were improved owing to the densification of the soil around the column, forming an influence zone around the columns, referred to as the smear zone in this study.…”

Section: Introductionmentioning

confidence: 99%

“…However, to date, there has been a lack of research on the installation effects of the CMC as a composite material on the load-transfer mechanism of improved ground and the load-carrying capacity of individual columns. Therefore, further research is necessary to understand the full potential of CMC technology [1,4,6]. The improved load-IOP Publishing doi:10.1088/1755-1315/1336/1/012005 2 carrying capacity owing to densification effects has the potential to yield significant cost savings, especially in large infrastructure projects where CMC has been used for ground improvement.…”

Section: Introductionmentioning

confidence: 99%

“…Suleiman et al [1] performed a field test for a single-column installation, highlighting the significance of installation effects and the smear zone. Nguyen [4] conducted finite difference-based numerical modeling to simulate the augur penetration stage investigating efficient installation sequences for a group of columns to prevent damage to nearby previously installed columns. However, the contribution of the smear zone to the increased load-bearing capacity has not been investigated in their research.…”

Section: Introductionmentioning

confidence: 99%

“…However, the contribution of the smear zone to the increased load-bearing capacity has not been investigated in their research. The physical model tests conducted by Nguyen [4] were performed in a small cylindrical model tank with a diameter of 500 mm for seven columns with a diameter of 50 mm, where the boundary effects may have hindered a realistic experimental investigation of the problem. King et al [6] conducted a numerical investigation of the installation effects.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simulation of controlled modulus column installation using a large deformation finite element analysis

Amarathunga,

Liyanapathirana,

Fuentes

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Controlled modulus columns (CMC) are widely used in ground improvement techniques where grout columns are constructed by penetrating an auger into the ground using the displacement approach. Numerical simulation of this problem is challenging owing to the large soil deformations associated with installation. Small strain-based finite element analysis procedures available in commercial finite element modeling software are unsuitable for simulating this problem because they cannot simulate large soil deformations around the auger during column installation. Hence, this study presents a numerical approach based on the finite element method to simulate the installation of CMCs. The numerical modeling technique adopted in this study considers large soil deformations around columns during penetration, and the proposed approach is based on remeshing and interpolation techniques. This method was developed using the Python development environment (PDE) within the ABAQUS/standard finite element program. It can penetrate columns below the ground surface without causing large mesh distortions. In this study, silty sand-type soil was considered; hence, the constitutive behavior was simulated using the Mohr–Coulomb criteria. The load-carrying capacity of a controlled modulus column was predicted and compared with an empirical equation based on the cone penetration resistance. The influence zone and failure mechanism of the soil during installation were determined by considering the stress distribution and soil flow pattern around the column.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of controlled modulus column installation using a large deformation finite element analysis

Amarathunga,

Liyanapathirana,

Fuentes

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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show abstract

“…Experimental work was extensively studied and presented by former researchers like Van Eekelen [5], who ignored the installation effect and focused on the behaviour of the load transfer mechanism in the soil-rigid inclusions matrix. Huu Hung et al [6,7] studied the effect of installation sequences of plain concrete rigid inclusions on the existing CMCs utilizing finite difference software without introducing the enhancement in soil parameters due to the installation effect. Muhannad T Suleiman [8]studied the interaction between the laterally loaded pile and the surrounding soil and introduced the alteration in horizontal soil stress.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the settlement associated with construction on soft clay improved using rigid inclusions considering the installation effect

et al. 2023

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This paper aims to develop simple and user-friendly charts to estimate the settlement improvement factor (N) that correlates the settlement values without soil improvement to the settlement values after improvement, considering the installation effect of the rigid inclusions in soft clay formations. The cavity expansion method is used to model the installation process of the rigid inclusions. A parametric study is carried out using numerical modelling to predict the variation in the improvement factor with the variation of the treated soil stiffness and geometry of the RI system. The analyses are performed using a verified numerical model for a case study of a zone loading test performed at New Mansoura city in Egypt, employing the finite element software (PLAXIS 3D). The cavity expansion approach is first utilized for an axisymmetric model by imposing a prescribed displacement equivalent to the inclusion radius to simulate the construction effect of the rigid inclusion. From the axisymmetric model, the enhancement in the deformation modulus and the over consolidation ratio of the soft clay, resulting from the construction of the rigid inclusions, are determined. In the second stage of the analysis, the improved soil parameters are then implemented in the 3D finite element model, in which the external stresses due to superstructure are applied over the improved soil. The settlement associated with loading both the improved and unimproved soils are then compared for each studied condition in the parametric study to determine the improvement factor (N). The performed analyses clearly showed the high effect of the rigid inclusions in reducing the settlement associated with the construction on the improved soft clay. The achieved improvement factor varies between 2.88 to 58.10, with an average value of about 12.00.

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Installation effect of rigid inclusions in soft clay improvement

Samy,

Ahmed,

Fayed

et al. 2023

Ain Shams Engineering Journal

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A numerical comparison of installation sequences of plain concrete rigid inclusions

Cited by 11 publications

References 74 publications

Simulation of controlled modulus column installation using a large deformation finite element analysis

Simulation of controlled modulus column installation using a large deformation finite element analysis

Prediction of the settlement associated with construction on soft clay improved using rigid inclusions considering the installation effect

Installation effect of rigid inclusions in soft clay improvement

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