Numerical Simulation of Embankment Construction on Soft Soil: A Case

Dias, Andréa Batista de Farias; Silva, Thiago Augusto da; Gomes, Igor Fernandes; Ferreira, Sílvio Romero de Melo; Gusmão, Alexandre Duarte; Joseph, Jean Baptiste; Neto, Manoel Porfírio Cordão

doi:10.1007/s10706-022-02210-w

Cited by 2 publications

(1 citation statement)

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“…The study is based on a high-speed rail project in Taicang, a city in eastern China on the alluvial plains of the lower Yangtze River, where the terrain is flat and open, and the foundation of the site is relatively homogeneous silty clay with a thickness of more than 30 m. To simulate the mechanical behavior of the soft soil in FLAC 3D , a modified Cam-Clay model built into the software was employed in the finite element analysis, as this model has been validated to be suitable for describing the pile-soil interaction in soft-soil areas, and a limited number of input parameters are required [38,39]. Since the soil of the site is relatively homogeneous, the foundation is simplified into a homogeneous soft soil in the model in order to more intuitively analyze the disturbance mechanism of pile installation, and the parameters of the foundation soil are obtained through the following experiments.…”

Section: Samplesmentioning

confidence: 99%

Study on Shielding Effect of the Pile Group in a Soft-Soil Foundation

Lin,

Huang,

Chen

et al. 2023

Applied Sciences

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Pile groups are frequently employed to reinforce soft soil foundations, while the piling process frequently disturbs the adjacent foundation. The shielding effect, which prevents the transmission of disturbances from pile installation, is indispensable for minimizing engineering disturbances and optimizing pile group construction techniques. However, current research focuses predominantly on characterizing the phenomenon of shielding, with a limited exploration of the mechanism. To eliminate the limitation, a numerical investigation of the shielding mechanism of pile groups in a pile–soil system is performed this study. Using the finite difference program FLAC3D and the cavity expansion theory, a three-dimensional numerical model of a pile–soil foundation was created. During the sequential penetration of piles, the response characteristics of the soil surrounding the piles were investigated. Displacement field was first investigated to determine the presence of shielding effects in the pile group and then highlighted the effective role of the existing piles in controlling deformation. Furthermore, through a combined analysis of the stress and strain fields during piling, the mechanism of the shielding effect induced by pile construction is proposed, which is attributed to the direct obstruction effect of piles and the “soil arching effect” created by the soil between piles. The former is reflected by the direct barrier of the existing pile to the soil displacement induced via the installation of the new piles. The latter is reflected by the obstruction of soil between two existing piles to the displacement of soil passing through the two existing piles. This research provides a comprehensive understanding of the mechanical behavior of the pile–soil system and has practical implications for controlling disturbances and optimizing construction techniques in piling engineering projects.

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Section: Samplesmentioning

confidence: 99%