Centrifuge study on behavior of rigid pile composite foundation under embankment in soft soil

Yu, Jianlin; Zhou, Jia-jin; Gong, Xiaonan; Xu, Riqing; Li, Junyuan; Xu, Shan-dai

doi:10.1007/s11440-020-01109-1

Cited by 26 publications

(11 citation statements)

References 30 publications

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“…The numerical model of the piled mountain profile is shown in Figure 2. The geotechnical parameters of the foundation soil were referenced from Yu et al (2021). The excavated soil was modeled using an elastic-plastic constitutive model with Mohr-Coulomb yield criterion and the non-associated flow rule.…”

Section: Numerical Methods Of the Piled Mountain By Using The Excavated Soilmentioning

confidence: 99%

Stability Satisfied Design and Construction of Excavated Soil Dumps in a Soft Soil Region in China

Wang

Zhan

et al. 2022

Front. Earth Sci.

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Dumping is the main disposal method of the excavated soil from underground engineering in China; however, due to a lack of construction experiences and technical standards, landslide disasters often occurred during rapid dumping of excavated soil in soft soil regions. In this paper, geotechnical tests were conducted on the excavated soil from a foundation engineering site in Hangzhou, where the excavated soil would be used to construct a piled mountain. On this basis, a numerical study was carried out to investigate the effects of the design parameters (heap height, slope gradient) and construction parameters (layer thickness, heap speed) on the dump stability and failure mode. The results show that the safety factor of the excavated soil dump decreases with increasing heap height, slope gradient, layer thickness, and heap speed. The potential slide surfaces are toe circle, and compared to layer thickness and heap speed, the heap height and slope gradient have more remarkable influence on the depth and area of potential slide mass. The heap height limit increases with a decrease in slope gradient, and the heap speed limit decreases with an increase in layer thickness. Under the premise of ensuring the slope stability, the optimal design and construction parameters were obtained, i.e., heap height 28 m, slope gradient 1:2.75, layer thickness 1.0 m, and heap speed 0.50 m/day. Compared to the original design scheme, the storage capacity increases by 20.01%, and the construction duration decreases by 30.25% in the optimal design.

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Section: Numerical Methods Of the Piled Mountain By Using The Excavated Soilmentioning

confidence: 99%

Stability Satisfied Design and Construction of Excavated Soil Dumps in a Soft Soil Region in China

Wang

Zhan

et al. 2022

Front. Earth Sci.

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“…A section of the high-filled embankment of a certain expressway is reinforced with rigid pile composite foundation [8]. The Taihua Expressway adopted dry vibration crushed stone piles for soft soil foundation treatment [14].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, pile composite foundation improvement has gradually become the main form of ground treatment and is widely used in road engineering [1,2,3,4,5,6,7] . However, in practical engineering, weak foundations reinforced by composite ground improvement often experience sliding and collapse due to insufficient stability [8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Feng,

Zhou

et al. 2024

Preprint

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When using pile composite foundation reinforcement for embankments in soft foundation sections, the embankment is prone to differential settlement, sliding, and even collapse. Based on the failure characteristics of pile composite foundation, this article proposes a reinforcement scheme using 'inclined-straight double-row piles' at the toe of the embankment slope. Through model tests, the deformation process, bending moment, and horizontal displacement of the pile body under lateral loading were compared for multiple sets of 'inclined-straight double-row piles'. Combined with numerical simulation analysis, the load-deformation characteristics and failure modes of the inclined-straight double-row piles under lateral loading were revealed, and a calculation analysis model was proposed to provide reference for the practical engineering application. The following conclusions were mainly drawn: (1) Under lateral loading, the inclined-straight double-row piles experience horizontal displacement, followed by bending deformation, with the inner piles failing first and the outer piles failing later, showing correlation. The failure load of the double straight piles falls between the inner and outer piles of the inclined-straight double-row piles. Increasing the bending stiffness of the inner piles and the inclination of the outer piles will significantly improve the overall stability. (2) When subjected to lateral loading, the inclined-straight double-row piles may experience overturning failure due to excessive lateral movement of the pile body or fracture failure due to excessive load on the pile body. (3) Calculation analysis models were developed for the overturning failure mode and pile body fracture failure mode.

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“…Simple concrete, which has relatively high strength and stiffness, is an efficient and effective solution for geotechnical infrastructure in soft soil [1][2][3][4][5]. In addition to full-scale field testing, small-scale modelling is pertinent to investigating the mechanical and failure behaviour of simple concrete structures and soil-structure interactions [6][7][8][9]. Appropriate modelling of the prototype stress level is crucial in small-scale physical tests for capturing the stress-dependent characteristics in geotechnical engineering.…”

Section: Introductionmentioning

confidence: 99%

Formulation and Performance of Model Concrete in Reduced-Scale Physical Model Tests

Zheng,

Xia,

Zhou

et al. 2023

Materials

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The utility of geotechnical centrifuge tests depends on how correctly they predict the physical and mechanical behaviour of concrete. In this study, a model concrete material that consisted of α-gypsum plaster, fine silica sand, and water was developed. An orthogonal test design was used to evaluate the effect of the mix proportion on the model concrete performance. The physical (i.e., flowability and bleeding rate) and mechanical (i.e., compressive and flexural strength) characteristics were considered as indices. Various mix ratios resulted in remarkable relative contributions to model concrete performance, and each raw material dosage exhibited positive or negative synergy. The water–plaster ratio (W/P) and aggregate–plaster ratio (A/P) strongly influenced the mechanical and physical characteristics, respectively. Multiple linear regression analysis (MLRA) was carried out to determine a forecast model for various small-scale test demands. Finally, the applicability and outlines of the presented forecasting method in proportioning design were evaluated by typical use of model concrete in small-scale model tests.

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Centrifuge study on behavior of rigid pile composite foundation under embankment in soft soil

Cited by 26 publications

References 30 publications

Stability Satisfied Design and Construction of Excavated Soil Dumps in a Soft Soil Region in China

Stability Satisfied Design and Construction of Excavated Soil Dumps in a Soft Soil Region in China

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Formulation and Performance of Model Concrete in Reduced-Scale Physical Model Tests

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