Performance of micropiled rafts in clay: Numerical investigation

Alnuaim, Ahmed; Naggar, M. Hesham El; Naggar, Hany El

doi:10.1016/j.compgeo.2018.02.020

Cited by 36 publications

(18 citation statements)

References 28 publications

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“…MC criterion; Calibrated with centrifuge test Influence on the inertial interaction. [37] Performance of MPed rafts in clay Scaled experimental method (centrifuge test)…”

Section: Simulation Of Mped Raft Behavior In Sand Withmentioning

confidence: 99%

Seismic Behavior of Micropiles and Micropiled Structures Used for Increasing Resilience: A Literature Review

Alhaija

Batali

2022

Applied Sciences

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The aim of this paper is to present the relevant information and development available in the scientific literature regarding the seismic behavior of micropiles (MPs) and micropiled structures (MPed). The seismic behavior of MPs is not very well studied, but MPs are used in retrofitting of old buildings and for new resilient buildings, and in terms of seismic behavior they have a high potential. Additionally, their association with seismic dampers for improving the seismic behavior of buildings is not yet fully studied and it represents a major topic of interest for both new structures and historical monuments. After the introductory part, the paper describes all relevant information regarding MPs, as types and technology, seismic behavior, applications for increasing seismic resilience, and experimental and numerical modeling.

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“…MC criterion; Calibrated with centrifuge test Influence on the inertial interaction. [37] Performance of MPed rafts in clay Scaled experimental method (centrifuge test)…”

Section: Simulation Of Mped Raft Behavior In Sand Withmentioning

confidence: 99%

Seismic Behavior of Micropiles and Micropiled Structures Used for Increasing Resilience: A Literature Review

Alhaija

Batali

2022

Applied Sciences

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“…e results indicated that the average settlement of the piled raft can be effectively reduced by widely spaced piles, while the differential settlement was reduced by placing the piles within the central area of the raft. Alnuaima et al [18] carried out FEM calculation on micropiles and verified it with centrifuge tests. Some cases were analyzed taking into account a number of factors, such as the number of micropiles, the spacing to micropile diameter, and the raft thickness.…”

Section: Introductionmentioning

confidence: 99%

Calculation Model and Numerical Validation of Horizontal Capacity of Micropiles with Different Section Forms

Wan-li

Jian

Liu

et al. 2022

Advances in Civil Engineering

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With the popularized application of micropile for slope reinforcement, there are many kinds of pile section form, such as single steel bar, multisteel bar, and tube. In order to obtain the theoretical calculation model of horizontal capacity of micropiles with different types, numerical simulations for two common conditions, namely, soil-soil and soil-rock, were carried out to study micropile reinforced slope’s deformation and failure regulation. The dominated indicator for micropile horizontal capacity was acquired. By using the equivalence principle, four kinds of micropiles’ capacity calculation model were deduced. Then, FEM numerical analysis was used for validation. The results show that the flexural capacity of micropile is a critical and dominated indicator which should be considered seriously in slope reinforcement design. When the ultimate flexural capacity is reached, the displacement of micropile reinforced slope will increase rapidly. The primary factor affecting the flexural capacity of micropiles is pile diameter, followed by section reinforcement ratio. The calculation results of the calculation model of flexural capacity proposed in this paper are close to those of numerical ones and are safer. The calculation model can provide reference for micropile selecting and slope reinforcement design, especially for quick design of emergency engineering.

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“…In this paper, the case of a piled raft system used on soft soils undergoing regional subsidence was studied. According to Alnuaim et al (2018), a piled raft is a composite structure with three components: subsoil, raft, and piles. The structural components interact with each other and with the surrounding soil (pile-soil, raft-soil, and pile-raft) to bear vertical, horizontal, and moment loads coming from the superstructure.…”

Section: Introductionmentioning

confidence: 99%

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

Posse¹,

Rebolledo²,

Garcia³

et al. 2021

S&R

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In this paper a 3D numerical model using a software based on the Finite Element Method (FEM), was developed and validated using the results obtained in a geotechnical centrifuge model of a piled raft system founded in soft soils undergoing regional subsidence. The piled raft configuration had nine piles distributed in the center of the raft. The kaolin parameters were obtained, calibrated, and validated for the Hardening Soil Model (HSM), based on laboratory triaxial and oedometer test results. Also, a single pile load test was carried out in the centrifuge to get the resistance parameters used in the FEM. The developed numerical model reproduced satisfactorily soil and foundation consolidation displacements due, not only by the structural service load but also by the pore pressure drawdown. For load distribution on piles and raft, the model reproduces with good agreement the foundation behavior only for the structural service load, for pore pressure drawdown some adjustments on the embedded piles elements shaft and base resistance had to be done. The developed model allowed to identify the most sensitive parameters for this type of simulation, to define the types and stages of analysis that had the best fit for the physical model, and to obtain additional results to those measured in the physical model, e.g., the axial load distribution developed along the piles and therefore the magnitude of the negative skin friction, that is an important load that should be considered for the structural safety review of piled foundations subjected to this complex conditions.

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Performance of micropiled rafts in clay: Numerical investigation

Cited by 36 publications

References 28 publications

Seismic Behavior of Micropiles and Micropiled Structures Used for Increasing Resilience: A Literature Review

Seismic Behavior of Micropiles and Micropiled Structures Used for Increasing Resilience: A Literature Review

Calculation Model and Numerical Validation of Horizontal Capacity of Micropiles with Different Section Forms

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

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