Discussion of an instrumented screw pile load test and connected pile group load settlement behavior

Impe, P.O. Van; Impe, William F. Van; Seminck, L.

doi:10.3233/jgs-130011

Cited by 4 publications

(2 citation statements)

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“…Presence of residual forces in the pile shafts of various technologies has been the subject of many publications, including Cooke (1979), Fellenius et al (2000), Fellenius (2002c), Maertens and Huybrechts (2003), Kim et al (2004), Siegel and McGillivray (2010), Krasiński (2012) and Sahajda (2015). In the case of screw displacement piles, initial compressive forces might be generated mainly as a result of negative friction occurring in the upper parts of the subsoil (Fellenius, 2002a;Van Impe et al, 2013). This friction is caused by the secondary settlement of the soil, which was raised during pile formation by a displacement auger.…”

Section: The Mechanism Of Residual Forces Generation In Screw Displac...mentioning

confidence: 99%

Identification of residual force in static load tests on instrumented screw displacement piles

Krasiński

Wiszniewski

2021

Studia Geotechnica Et Mechanica

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Occurrence of the so-called residual force of an unknown value significantly disturbs interpretation of static load tests performed on piles equipped with additional measuring instruments. Screw displacement piles are the piling technology in which the residual force phenomenon is very common. Its formation mechanism is closely related to the installation method of this type of piles, which initiates generation of negative pile skin friction without any additional external factors. Knowledge of the value and distribution of a residual force (trapped in a pile shaft before starting the load test) is a necessary condition for the proper interpretation of instrumented pile test results. In this article, a clear and easy-to-use method of residual force identification, based on the analysis of shaft deformations recorded during pile unloading is presented. The method was successfully verified on two pile examples and proved to be effective and practical.

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Section: The Mechanism Of Residual Forces Generation In Screw Displac...mentioning

confidence: 99%

Identification of residual force in static load tests on instrumented screw displacement piles

Krasiński

Wiszniewski

2021

Studia Geotechnica Et Mechanica

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“…Described in the sources of calculation methods, allow us to investigate the bearing capacity of piles, depending on the material pile [1 -14], driving depth [1,4,5,15,16], and the physical and mechanical properties of soils [4,7,8,15,21,22]. As the bearing capacity is calculated from the stiffness of the cross section in the horizontal loads [17][18][19][20] and cross-sectional shape [21].…”

Section: Introductionmentioning

confidence: 99%

The Comparison of Pile Load Capacity Based on the Results of Analytical Calculations and Static Tests

Badanin

Mel’nikov

Filippova

2015

AMM

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The article discusses the causes of discrepancies in the values of the pile load capacity based on the results of calculations made on the basis of existing regulations and the pile load capacity after static load test on the construction site. A brief overview of the causes of discrepancies in analytical and practical values of pile load capacity is provided in the article. The possible ways to solve this problem are suggested, namely, the development of the methods of analytical calculations of pile load capacity and the improvement of embedding technical processes. There is an example of such a discrepancy in the construction of a residential complex in Saint-Petersburg presented in the article. It was found that the variation in the results is not caused by the imperfections in the method of calculations, but by the infringements of construction technology. The article provides recommendations to minimize the discrepancies between the calculated and actual values of pile load capacity.

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Observations and analysis of wide piled foundations

Fellenius¹

2019

Can. Geotech. J.

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Available case histories on observations on full-scale piled rafts show that the settlement response to applied load can be modeled as that for an equivalent pier due to compression of the piles and the soil matrix plus that of an equivalent raft for compression of soil layers below the pile toe level. Interior piles engage the soil from the pile toe level upward in contrast to a single pile, which engages it from the ground downward. Piles and soil, combined as a pier, have strain compatibility, which requirement determines the distribution of load between the piles, the contact stress, and the load-transfer movement of the piles. The response between the interior and perimeter piles differ. Particularly so in non-subsiding and subsiding environment, because perimeter piles can be subjected to downdrag and drag forces, while neither downdrag nor drag force will affect the interior piles. In non-subsiding environment, it is advantageous to make perimeter piles shorter, while in subsiding environment perimeter piles best be longer. The load distribution across the raft is also governed by the degree of rigidity of the raft and by the difference in dishing at the pile toe level and in the dishing of the actual raft.

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Discussion of an instrumented screw pile load test and connected pile group load settlement behavior

Cited by 4 publications

References 0 publications

Identification of residual force in static load tests on instrumented screw displacement piles

Identification of residual force in static load tests on instrumented screw displacement piles

The Comparison of Pile Load Capacity Based on the Results of Analytical Calculations and Static Tests

Observations and analysis of wide piled foundations

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