Performance of screw–shaft pile in sand: Model test and DEM simulation

Chen, Yadong; Deng, An; Wang, Anting; Sun, Huasheng

doi:10.1016/j.compgeo.2018.08.013

Cited by 51 publications

(16 citation statements)

References 45 publications

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“…25). This lightweight screw-pile solution is characterized by its minimal environmental impact, its stability and resistance to high forces [33,34,35], axially and laterally.…”

Section: Link With Ground Supportsmentioning

confidence: 99%

Deployable double layer tensegrity grid platforms for sea accessibility

Hrazmi¹,

Averseng²,

Quirant³

et al. 2021

Engineering Structures

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Tensegrity systems are a class of reticulated space structures composed of compressed bars maintained in equilibrium by a network of tensioned cables. Their stiffness depends both on elements' mechanical properties and their internal selfstress state. Taking advantage of their structural properties, we respond to the challenge of accessibility for everybody to the sea with a new concept of modular lightweight and deployable platforms. Variable configurations are developed to fit ecologically into the marine environment thanks to the transparency of double layer tensegrity structures. Moreover, allowing practical assembly and disassembly is considered in the design to respect the coastal law. Through a numerical study, we demonstrate in this paper the capability of this solution under various representative load cases and support conditions.After the structural and design optimization of elements constrained by weight and stiffness, we detail the design of the nodes, which are the key components ensuring geometry and foldability of the structure. Finally, on-site setting and interfacing with ground supports is experimented in marine conditions to proof the feasibility of this concept.

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“…25). This lightweight screw-pile solution is characterized by its minimal environmental impact, its stability and resistance to high forces [33,34,35], axially and laterally.…”

Section: Link With Ground Supportsmentioning

confidence: 99%

Deployable double layer tensegrity grid platforms for sea accessibility

Hrazmi¹,

Averseng²,

Quirant³

et al. 2021

Engineering Structures

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“…In this paper, pile based model test with a single plate, different test models of the NT-CEPP under the vertical tension will be built [17][18] . Through the model test with the undisturbed soil, the effect of the soil thickness layer at the top of the plate is studied.…”

Section: Issn: 0010-8189 © Converter 2020 Wwwconverter-magazineinfomentioning

confidence: 99%

Test study on thickness of soil layer at top of plate affecting uplift failure of the NT-CEPP

Qian¹

2021

converter

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This paper studies the influence of the thickness of the soil layer on the head of the plate on the carrying capacity of the new type concrete plates-expanded pile (NT-CEPP) under vertical tension, and innovatively uses the half-section pile test method to measure undisturbed soil and ANSYS is used for comparative analysis. Due to the small-scale test based on the half-section pile and disturbed soil, not only can the overall invalidation mechanism of the soil around the pile be seen more clearly, but the undisturbed soil can also be used to better ensure the stability of the soil. At the same time, in the test, depending on the real station under construction, the authenticity and economy of the test should be ensured. The results of test reveal that the invalidation behaviour of the on the top of plate of the NT-CEPP has little effect on the adjacent soil layer when the soil thickness of embedded slab is more than 3 times the length of the cantilever of the slab, and the characteristics of adjacent soil-layer had no influence on the carrying capacity of the plate.

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“…In this study, the pile loading test result was used to calibrate these micromechanical parameters. e bearing capacity of the pile group was the sum of the vertical contact forces of all the walls [49]. With reference to similar studies [42,50], iterations were attempted to harmonize the simulation Q-S curve with the test curve, enabling material micromechanical parameter optimization.…”

Section: Micromechanical Parameter Identificationmentioning

confidence: 99%

Working Mechanism of Pile Group with Different Pile Spacing in Dense Sand

Chen

Namdar

et al. 2019

Advances in Civil Engineering

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Complex interaction mechanism exists between the pile group and soil. To realize the pile-soil load transmission mechanism in detail, the failure pattern of pile groups installed in dense sand considering different pile spacing was investigated by means of laboratory experimental model test and three-dimensional discrete element method. The results suggested that the narrow pile spacing was beneficial to the development of the pile tip resistance, and it enhanced the bearing performance of the pile group at the initial stage of settlement. The pile spacing changed the shaft resistance pattern with modification of the strain energy mechanism released within the subsoil. The pile group with 6b pile spacing had higher composite group efficiency. A joint fan-shaped displacement zone was formed beneath the pile tip for the pile group with 3b pile spacing; this pile foundation presented the block failure mechanism. The sand displacement beneath the cap for the pile group with 6b pile spacing mainly located on the upper part of the piles, the sand displacement around both sides of the piles presented asymmetric, and a relatively independent fan-shaped displacement zone was formed beneath the pile tip.

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Performance of screw–shaft pile in sand: Model test and DEM simulation

Cited by 51 publications

References 45 publications

Deployable double layer tensegrity grid platforms for sea accessibility

Deployable double layer tensegrity grid platforms for sea accessibility

Test study on thickness of soil layer at top of plate affecting uplift failure of the NT-CEPP

Working Mechanism of Pile Group with Different Pile Spacing in Dense Sand

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