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 8 publications

(4 citation statements)

References 43 publications

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“…7 shows the micropile horizontal reaction coefficient variation as a function of the horizontal displacement for both conditions studied. The Young modulus considered for the calculation was 13 GPa, found in previous works on instrumented micropiles under axial loading tests at the same site [31,32]. The n h value found for the natural moisture content was 32.7 MN/m³.…”

Section: Horizontal Reaction Coefficientmentioning

confidence: 76%

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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Section: Horizontal Reaction Coefficientmentioning

confidence: 76%

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 slurry entered the annular pipe from the vertical pipe, and there was a one-way grouting head distributed on the annular pipe. Fiscina et al [13] developed a new micro-steel pipe pile-side grouting device in which the small-diameter steel pipe on the pile side directly punched holes to be used as grouting holes. After the steel pipe pile was driven into the ground, the grouting pipe was placed at the location of the steel pipe pile grouting holes and blocked from above so that the slurry could be injected in sections, which made the slurry distributed more uniformly.…”

Section: Introductionmentioning

confidence: 99%

Study on Vertical Bearing Capacity of Pile Foundation with Distributed Geopolymer Post-Grouting on Pile Side

Li,

Xia,

Xie

et al. 2024

Materials

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To study the applicability of the new geopolymer grouting material for super-long and large-diameter post-grouting bored piles in silty fine sand geology, this paper compares the bearing capacity of two grouting materials, geopolymer and normal Portland cement, and different grouting volume pile side-distributed grouting piles in silty fine sand based on field model tests are analyzed through the diffusion forms of the two materials in silty fine sand through the morphology of the grouted body after excavation. The results show that the ultimate bearing capacities of P0 (ungrouted pile), P1 (8 kg cement grouted pile), P2 (6 kg geopolymer-grouted pile), P3 (8 kg geopolymer-grouted pile) and P4 (10 kg geopolymer-grouted pile) are 5400 N, 8820 N, 9450 N, 11,700 N and 12,600 N, respectively, and that the ultimate bearing capacity of the grouted pile is improved compared with that of the ungrouted pile since, under the same grouting amount, the maximum bearing capacity of the pile using geopolymer grouting is increased by 133% compared with that of the pile with cement grouting. This further verifies the applicability of the geopolymer grouting material for the post-grouting of the pile foundation in silty fine sand. Under the action of the ultimate load, the pile side friction resistance of P1, P2, P3 and P4 is increased by 200%, 218%, 284% and 319% compared with that of P0. In addition, the excavation results show that the geopolymer post-grouting pile forms the ellipsoidal consolidation body at the pile side grouting location, which mainly comprises extrusion diffusion with a small amount of infiltration diffusion, and the cement grouting pile forms a sheet-like consolidation body at the lower grouting location, which primarily comprises split diffusion. This study can provide a reference basis for the theoretical and engineering application of post-grouting piles using geopolymers.

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

Cited by 8 publications

References 43 publications

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

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

Study on Vertical Bearing Capacity of Pile Foundation with Distributed Geopolymer Post-Grouting on Pile Side

Innovations in Micropile Testing Using Distributed Optical Fibre Sensors

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