Field study on axial behavior of instrumented post-grouted steel pipe micropiles in tropical lateritic soil

Fiscina, Luiz Felipe Goulart; Barbosa, Yuri; Albuquerque, Paulo José Rocha de; Carvalho, David de

doi:10.1007/s41062-020-00411-x

Cited by 5 publications

(1 citation statement)

References 43 publications

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“…The micropile classification may vary based on grouting techniques, drilling casing and reinforcement [3]. For example, steel pipe micropiles rely on the use of high-strength steel pipes as a drilling tool, casing protection, structural component and injection device [4]. Micropiles that have been designed as rock socketed piles in the bedrock may carry either compression load or tension load [1] and can be subjected to lateral loading [5].…”

Section: Introductionmentioning

confidence: 99%

Innovations in Micropile Testing Using Distributed Optical Fibre Sensors

Mohamad,

Tee,

Beddelee

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Micropiles are primarily used in situations where traditional foundation methods, such as large-diameter bored piles or driven piles, are not feasible due to various constraints, including limited access, low headroom, or the need to work in environmentally sensitive areas. They are often employed in urban areas with restricted space or for underpinning existing structures. Two case studies of instrumented micropiles are presented in this paper, with the aim to showcase innovations in pile testing using Distributed Optical Fibre Sensing (DOFS). In the first project, micropiles were installed as part of an underpinning work where several existing piles were removed to allow safe passage of Tunnel Boring Machine (TBM) underneath the building. An experiment pile was instrumented with conventional and DOFS sensors to measure pile responses due to tunnelling in proximity. In the second project, the micropile was tested to determine its load carrying capacity for buildings constructed in hilly area. In both cases, API pipes were applied and socketed into bedrocks. Optical cables were attached on four sides of the steel pipes and subsequently grouted. During the load tests, DOFS data were able to display precisely the shaft distribution of micropiles when subjected to vertical loads as well as bending behaviour due to the close proximity tunnelling. Interpretations of distributed strain profiles from DOFS have contributed to a better understanding of API-reinforced micropile performance under complex geological and loading conditions.

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Section: Introductionmentioning

confidence: 99%

Innovations in Micropile Testing Using Distributed Optical Fibre Sensors

Mohamad,

Tee,

Beddelee

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Characterizing Structural Bearing Capacity and Deformation Behaviors of Micropiles under Multi-Stage Static Loading

et al. 2023

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Behavior of a new laterally top-loaded post-grouted micropile in highly porous lateritic soil

Barbosa

Tarozzo

Albuquerque

et al. 2023

DYNA

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The use of micropiles has been increasing in recent years, mostly for horizontally loaded cases. Given the little information about this foundation type under lateral top-loading, especially in high-porosity and collapsible soils, a total of four transversal loading tests were carried out in a new post-grouted micropile configuration with length of 17 m and diameter of 0.3 m, two in natural soil moisture conditions and two in flooded conditions. Load-displacement curves and the horizontal reaction coefficient of the new micropile were obtained. Results were compared with other pile types laterally tested under the same conditions and in the same geological and geotechnical contexts. Generally, results were better than the other pile types, mainly under saturated condition. The new micropile proved to be a better and more efficient alternative for local lateritic soil treatment when compared with the soil-cement treatment.

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Field study on axial behavior of instrumented post-grouted steel pipe micropiles in tropical lateritic soil

Cited by 5 publications

References 43 publications

Innovations in Micropile Testing Using Distributed Optical Fibre Sensors

Innovations in Micropile Testing Using Distributed Optical Fibre Sensors

Characterizing Structural Bearing Capacity and Deformation Behaviors of Micropiles under Multi-Stage Static Loading

Behavior of a new laterally top-loaded post-grouted micropile in highly porous lateritic soil

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