Roads and Bridges - Drogi i Mosty
20, 3, 2021, 253-265

Evaluation of bearing capacity of CFA piles with bases widened by means of jet grouting

Leszek Rafalski Mail
Road and Bridge Research Institute, 1 Instytutowa St., 03-302 Warsaw
Czesław Szymankiewicz Mail
Road and Bridge Research Institute, 1 Instytutowa St., 03-302 Warsaw
Daniel Słowikowski Mail
"Polbud-Pomorze" Limited Liability Company., Łącko 18, 88-170 Pakość
Dariusz Petyniak Mail
Road and Bridge Research Institute, 1 Instytutowa St., 03-302 Warsaw
Published: 2021-09-29

Abstract

The paper presents the results of tests of continuous flight auger (CFA) piles with bases widened by means of jet grouting. During construction of bridge structures of the S8 expressway at the Salomea interchange in Warsaw, an experimental CFA pile with a widened jet grouted base was constructed and its ultimate bearing capacity was 1.5 times greater than the bearing capacity of the reference pile, and its allowable load was 1.65 times greater than the allowable load of the reference pile. It was observed that the full base resistance of this pile was mobilized at displacements corresponding to approximately 0.1 of the diameter of the pile. During construction of bridge structures of the S8 expressway on the bypass of Marki, load tests were performed on 17 CFA piles with widened jet grouted bases. It was determined that the average design value of bearing capacity of the piles was 1.23 greater than the average design value of loading specified in the design documentation and the average ultimate bearing capacity was 1.78 greater than the average design load. The average ratio of design bearing capacity determined from the load test equaled 1.23 and the average ratio of the ultimate bearing capacity equaled 1.89. Based on the experimental trials, the principles for calculation of bearing capacity of CFA piles with widened jet grouted bases were formulated.

Keywords


bearing capacity, CFA piles, jet grouting, widened base.

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References


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Evaluation of bearing capacity of CFA piles with bases widened by means of jet grouting

  
Rafalski, Leszek et al. Evaluation of bearing capacity of CFA piles with bases widened by means of jet grouting. Roads and Bridges - Drogi i Mosty, [S.l.], v. 20, n. 3, p. 253-265, sep. 2021. ISSN 2449-769X. Available at: <>. Date accessed: 25 Oct. 2021. doi:http://dx.doi.org/10.7409/rabdim.021.015.