Estimation of Dynamic Impedance of the Soil–Pile–Slab and Soil–Pile–Mattress–Slab Systems

Messioud, Salah; Sbartai, Badreddine; Dias, Daniel

doi:10.1142/s0219455417500572

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…Yan Jiang et al (2014) conducted a parametric study of a wellmonitored pile-slab-supported embankment for a high-speed railway to investigate the settlement, the load distribution between the soil and the piles, the structural design parameters, and the excess pore pressure. Messioud et al (2016aMessioud et al ( , 2016b) presented a comparison between rigid piles and pile foundations.…”

Section: Pile-slab Structure-supported Embankmentsmentioning

confidence: 99%

“…They found that the settlements of geogridreinforced embankments over piles were 20-30% smaller than conventional pile-supported embankments. Messioud et al (2016aMessioud et al ( , 2016b presented a 3D finiteelement model for the dynamic analysis of a soil-pile slab for identifying the influence of mattress stiffness and the pile-soil contact conditions on the dynamic response of the foundation system. Kim (2009) utilized SLOPILE software to design a piled bridge abutment reinforced by a piled slab at a real site.…”

Section: Pile-slab Structure-supported Embankmentsmentioning

confidence: 99%

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“Effectiveness Of Cfg Pile-Slab Shape On Smooth Soil For Supporting Excessive-Pace Railway Embankment”

Sharma¹

2021

TURCOMAT

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Reducing the settlements of smooth foundation efficiently is a crucial problem of excessive-pace railway creation in China. The new CFG pile-slab structure composite foundation is a floor remedy method that is carried out on CFG pile basis and pile-slab structure composite basis. Based on the revel in of constructing Beijing-Shanghai excessive-pace railway in China, the settlement-controlling effect, the settlement distribution legal guidelines and 3 key influence elements for structural shape of latest CFG pile-slab structural foundation are studied by the use of physical model exams and numerical simulations. The research results on this look at imply that the piles and soil bearing capacities of the new CFG pile-slab shape can be positioned into complete play due to the “load dispensing” function of slabs. The settlement decreasing effect of the new CFG pile-slab shape is first rate and can meet the requirements of high-pace railway creation. The affected location of engineering load has a depth over 18.Seventy five m and horizontal period of 7.Five m nearing the embankment slope toe. The parametric observe presents the optimalizing structural form for high-quality agreement-controlling effect. The bodily version test results display precise concordance with the numerical simulation effects. The mixture of bodily version assessments and numerical simulations justifies the usage of this version in geotechnical engineering practices.

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Section: Pile-slab Structure-supported Embankmentsmentioning

confidence: 99%

Section: Pile-slab Structure-supported Embankmentsmentioning

confidence: 99%

“Effectiveness Of Cfg Pile-Slab Shape On Smooth Soil For Supporting Excessive-Pace Railway Embankment”

Sharma¹

2021

TURCOMAT

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“…[18][19][20][21] Nowadays, four types of method have been developed to obtain both soil attenuation factor and dynamic interaction factor between adjacent piles: (a) the formulation based on Voigt model [22][23][24] ; (b) the formulation from plane stain method 18,[25][26][27][28] ; (c) analytical methods based on continuum model 20,29,30 ; (d) numerical approaches based on the finite element method (FEM), the difference method, the boundary element method or discrete element method. 21,[31][32][33][34][35] The numerical calculation in dynamic domain often requires a cumbersome discretization treatment, 36,37 and significant running time and computer resources, which usually means high cost in engineering design. The spring and damping coefficient in Voigt models are empirical and have to be calibrated before application.…”

Section: Introductionmentioning

confidence: 99%

Vertical dynamic interaction and group efficiency factor for floating pile group in layered soil

Kouroussis

Lian

et al. 2023

Num Anal Meth Geomechanics

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This paper theoretically estimates the dynamic pile–soil interaction and the group efficiency factor for pile group in layered soil through energy‐based method. The vertical dynamic interaction of partially embedded single piles and their surrounding layered soil is analytically deduced from Hamilton's principle. Combined with a series of numerical simulations, the soil attenuation factor from energy method is modified for adapting to the wave speed variation in various layers. Then, the pile‐to‐pile interaction factor is directly solved with the help of the transfer‐matrix method. The dynamic governing equation of pile group with an elevated rigid cap is established by superposing the pile‐to‐pile interaction factors. Finally, the dynamic impedance of pile group is obtained and derived into a group efficiency factor. Compared with the plane strain method, this present method can produce a more suitable soil attenuation factor and a dynamic interaction factor at low frequency range, which is exploited for practical engineering design. The effects of subsoil layer, subsoil layer, and unembedded pile segment on group efficiency factor are investigated. The results show that the real part of group efficiency factor decreases at high frequency range for a small pile spacing, which may be detriment to the pile group capacity. Besides that, the combined effects of unembedded segment and weak surface soil on group efficiency factor are highlighted.

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“…However, simple constitutive models were often applied for soils, which led to under-or overestimations of the results. The embankments and soft soils were often modelled using linear elasticity or linear elastic with perfectly plastic models combined with damping characteristics [4,[12][13][14][15]. As a result, the cumulated settlements and stress degradation on piles were not clearly illustrated.…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

Phạm

Dias

2021

Applied Sciences

Self Cite

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This paper is based on small-scale laboratory tests (1:10) of a rigid inclusion-improved soil under normal gravity. A low area improvement ratio (2.4%) under monotonic and cyclic loading was used. 3D numerical calculations are performed to model these tests. The proposed numerical modeling is performed by the finite element method (FEM) using the ABAQUS software. A representative elementary volume model is suggested for reducing the calculation time. A hypoplastic constitutive model (HYP model) is applied for the load transfer platform (LTP). A total of three geometrical configuration cases of the experimental tests are numerically considered including a rigid slab over a mattress of 100 mm on the reinforced soil, a mattress of 100 mm on the reinforced soil, and a rigid slab over a mattress of 50 mm on the reinforced soil. The proposed numerical results are compared to the experimental data and the previous numerical results of Houda. The cyclic response of the systems is shown in terms of soil arching and settlements. The decrease in pile efficacy and the cumulative settlements are exhibited. The HYP model allows to better simulate the soil arching mechanisms inside the LTP than the CYsoil model used in the Houda’s research work. A good concordance between the proposed numerical results and the experimental data was obtained.

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Estimation of Dynamic Impedance of the Soil–Pile–Slab and Soil–Pile–Mattress–Slab Systems

Cited by 10 publications

References 21 publications

“Effectiveness Of Cfg Pile-Slab Shape On Smooth Soil For Supporting Excessive-Pace Railway Embankment”

“Effectiveness Of Cfg Pile-Slab Shape On Smooth Soil For Supporting Excessive-Pace Railway Embankment”

Vertical dynamic interaction and group efficiency factor for floating pile group in layered soil

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

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