Comparative Analysis of European and Belarusian Standards for Geotechnical Design of Pile Foundations in the Context of the Republic of Belarus

ABSTRACT

The article presents results of the geotechnical studies and verification of design approaches and methods for calculating the bearing capacity of pile foundations in the ground conditions of the Belarusian region carried out by the Institute BelNIIS RUE under agreement with the Ministry of Architecture and Construction (MAiS) of the Republic of Belarus for the clarification of the parameters of National Annexes to Eurocode 7. Examples of comparative geotechnical calculations according to Belarusian and European standards are provided, and their analysis is given.

Generalization of the results of comparative calculations according to Belarusian (hereinafter – “TKP RB [1-4]”) and European (hereinafter
– “TKP EN [5-8]”) frameworks of national standards (TNPA) allowed us to identify some patterns:

1 – when calculating the bearing capacity (the first group of limit states), according to the TKP RB and TKP EN using the data of static pile
load testing of soils, the main role in its determination is played by the following factors:
– the size of the pile cross section. The greater the cross section of the pile, the greater the difference in the results of calculations for the two TNPA frameworks. The greatest coincidence of results is established for piles with a diameter or a larger side of (200–500) mm;
– the number of tests performed and the variation of their results, since the safety factors in TKP EN are constant, and in TKP RB their value is determined based on the number of tested piles using the probabilisticstatistical method; 
– method of determining the bearing capacity of piles, the value of which according to TKP EN is set depending on the settlement taken at
10 % of the diameter or the larger side of the pile, and according to TAP RB it is set depending on the share of the average (maximum) foundation settlement allowed for the designed structure.

2 – when calculating the bearing capacity of natural foundations of piles using physical and mechanical characteristics (theoretical method)
according to the two national TNPA frameworks, the discrepancies between their results when reaching the limit state are 10–20 % (when
compared with DA1...DA2) and up to 50 % or more (with DA3). The smallest discrepancy between the TNPA frameworks is observed when
using the Eurocode 7 DA2 design approach, which is recommended as the main approach for National Annex in pile calculations.

Keywords: Belarusian and European standards, Eurocode 7, comparative calculations, design approaches, foundation, piles, bearing capacity, partial safety factors.

For citation: Krautsou U. Comparative analysis of European and Belarusian standards for geotechnical design of pile foundations in the
context of the Republic of Belarus. Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 10. 2018. Pp. 36–57. https://doi.org/10.23746/2018-10-03



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