Feedback on static axial pile load tests for better planning and analysis

Szymkiewicz, F.; Kouby, Alain Le; Sanagawa, Taisuke; Nishioka, Hidetoshi

doi:10.1201/9781003215226-5

Cited by 3 publications

(1 citation statement)

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“…However, concrete is a non-linear elastoplastic material, and its execution conditions affect its homogeneity. Results achieved on cored samples shows the great variability of the modulus of pile concrete [6].…”

Section: Introductionmentioning

confidence: 98%

Time and Strain Dependency of Pile Stiffness: Impact on Pile Behavior and Pile Loading Tests Results

Szymkiewicz¹

2023

GEOMATE

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Static pile loading tests are carried out for different purposes: feed extended databases from which design bearing capacity of piles are derived, control the design, develop new piling methods, but also in some cases better understand the behaviour of a deep foundation submitted to additional solicitations such as temperature variations, in the case of geothermal foundations systems. These tests are conducted on any type of piles, themselves made from very different materials. For cast-in-place piles made of a combination of cementitious materials (either cement paste, mortar or concrete for example) and steel, the stiffness of the pile is a combination of the stiffnesses of the different materials. Furthermore, cementitious materials are well known to be evolutive materials, especially regarding their strength. By contrast, the strain, stress and time dependency of the stiffness of the cast-in-place piles is not so well known, and therefore generally not taken into account when analysing static pile loading tests. The aim of this publication is to impart the importance of the evolution of pile stiffness with time and under stress, through different practical examples, and comparisons are made with results obtained with more classical analysis methods.

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Section: Introductionmentioning

confidence: 98%

Time and Strain Dependency of Pile Stiffness: Impact on Pile Behavior and Pile Loading Tests Results

Szymkiewicz¹

2023

GEOMATE

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Full scale study of pile response to EPBS tunnelling on a Grand Paris Express site

Mohamad

Bourgeois

Kouby

et al. 2022

Tunnelling and Underground Space Technology

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Static Pile Load Tests: Contribution of the Measurement of Strains by Optical Fiber

Szymkiewicz¹,

Minatchy²,

Reiffsteck³

2021

GEOMATE

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The use of optical fiber for measuring strain and or temperature is increasing in civil engineering. Optical fiber is known to be relatively cheap, compared to the more traditional sensors commonly used, and can, depending on the chosen technology, give a complete distribution along the instrumented element, which can be very interesting in case of an element with variable dimensions along the length of said element. Therefore, for static pile loading tests, the use of optical fiber should present many advantages, compared to more conventional methods of strain measurements. The aim of this paper is to shed new light on the advantages and disadvantages of using optical fiber for the measurement of deformations along a foundation element. After a review of the state of the art of the most commonly used methods, the contribution of the optical fiber for the instrumentation of the foundation elements is evaluated, by comparing the results obtained by the use of the fiber with those obtained with more traditional methods, in some examples of full-scale load tests. Finally, some recommendations are given to maximize the awareness of the potential use of optical fiber in foundation monitoring.

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Feedback on static axial pile load tests for better planning and analysis

Cited by 3 publications

References 0 publications

Time and Strain Dependency of Pile Stiffness: Impact on Pile Behavior and Pile Loading Tests Results

Time and Strain Dependency of Pile Stiffness: Impact on Pile Behavior and Pile Loading Tests Results

Full scale study of pile response to EPBS tunnelling on a Grand Paris Express site

Static Pile Load Tests: Contribution of the Measurement of Strains by Optical Fiber

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