Vladimir Konyushkov, Van Trong Le


Introduction: Saint Petersburg is characterized by complex engineering and geological conditions due to the presence of a significant mass (with a thickness of 20…30 m or more) of highly deformable soils with deformation moduli of 5…10 MPa. Besides, due to long-term geological processes that took place in the territory of Saint Petersburg thousands of years ago, these soils are extremely unevenly distributed in depth and area of occurrence. However, according to modern requirements for city development, deeper underground structures and higher buildings are needed. In terms of geotechnical solutions, it is possible to meet these requirements by using deep piles. Purpose of the study: The authors of the paper made an approximate brief classification of the geological conditions of Saint Petersburg based on the genesis, depth of occurrence, and physical and mechanical properties, and developed a method for more accurate calculations of the bearing capacity of deep bored piles. Methods: In the course of the study, the authors performed statistical processing of 600 values of the bearing capacity of bored piles, calculated according to the requirements of standards and determined by the results of field tests. In addition, they performed a non-linear extrapolation of side friction and resistance values (for soils with a depth of up to 100 m). Results: The paper presents the assessment of the bearing capacity of bored piles depending on their depth in glacial moraine and pre-quaternary vendian deposits. Using the nonlinear extrapolation, the authors calculated the side friction and resistance under the toe of bored piles for further design of pile foundations with deep bored piles (at a depth of up to 100 m). Discussion: According to statistical studies, the actual bearing capacity of bored piles is significantly higher than the design one calculated according to the requirements of corresponding standards (by 1.6...2.6 times). This is due to the fact that soils with significantly differing strength and deformation characteristics are located along the side and under the toe of bored piles. The stronger the soil where the most part of the pile is located, the more the bearing capacity error is (towards underestimation). The paper presents studies confirming this statement.


Glacial moraine and pre-quaternary vendian deposits, side friction, resistance under the pile toe, bearing capacity of bored piles at a depth of up to 100 m

Full Text:



Dashko, R. E., Aleksandrova, O. Yu., Kotyukov, P. V. and Shidlovskaya, A. V. (2011). Specifics of engineering and geological conditions in Saint Petersburg. Urban Development and Geotechnical Construction, 1, pp. 1–47.

Filippov, N. B. and Spiridonov, M. A. (eds.) (2009). Geological Atlas of Saint Petersburg. Saint Petersburg: Komilfo, 57 p.

Gotman, N. Z., Alekhin, V. S. and Sergeev, F. V. (2017). Determination of bearing capacity of piles in the group. PNRPU Bulletin. Construction and Architecture, 8 (3), pp. 13–21. DOI: 10.15593/2224-9826/2017.3.02.

Ilyichev, V. A. and Mangushev, R. A. (eds.) (2016). Geotechnical engineer’s reference book. Bases, foundations, and underground constructions. 2nd edition. Moscow: ASV Publishing House, 1040 p.

Konyushkov, V. V., Kondratieva, L. N., Kirillov, V. M. and Le Van Trong (2019). Accelerated methods for determining the bearing capacity of drill piles. Bulletin of Civil Engineers, 3, pp. 63–71. DOI: 10.23968/1999-5571-2019-16-3-63-71.

Mangushev, R. A., Ershov, A. V. and Osokin, A. I. (2010). Modern pile technologies. 2nd edition. Moscow: ASV Publishing House, 240 p.

Mangushev, R. A., Konyushkov, V. V. and D’yakonov, I. P. (2014). Analysis of practical application of screw-in cast piles. Soil Mechanics and Foundation Engineering, 51 (5), pp. 227–233.

Mangushev, R. A., Osokin, A. I. and Sotnikov, S. N. (2018). Geotechnics of Saint Petersburg. Experience in construction on weak soils. Moscow: ASV Publishing House, 386 p.

Osokin, A. I., Konyushkov, V. V., Dyakonov, I. P. and Le, V. T. (2019). Evaluation of the bearing capacity of the drilling pile for construction of a skyscraper with a developed underground structure. Bulletin of Civil Engineers, 4, pp. 58–67. DOI: 10.23968/1999-5571-2019-16-4-58-67.

Shashkin, A. G. (2014). Design of buildings and underground structures in complex geological conditions of Saint Petersburg. Moscow: Publishing house “Academicheskaya Nauka” — Geomarekting, 352 p.

Shulyatyev, O. A. (2016). Bases and foundations of high-rise buildings. Moscow: ASV Publishing House, 392 p.

Shulyatyev, O. A., Mozgacheva, O. A., Pospekhov, V. S. (2017). Development of urban underground spaces. Moscow: ASV Publishing House, 510 p.

Ter-Martirosian, A. Z., Ter-Martirosian, Z. G. and Luzin, I. N. (2017). Stress-strain condition of base of deep foundations. PNRPU Bulletin. Construction and Architecture, 8 (2), pp. 96–103. DOI: 10.15593/2224-9826/2017.2.09.

Ter-Martirosyan, Z. G. (2009). Soil mechanics. Moscow: ASV Publishing House, 553 p.

Ter-Martirosyan, A. Z., Ter-Martirosyan, Z. G. Trinh, T. V. and Luzin, I. N. (2015). Sediment and bearing capacity of long pile. Vestnik MGSU (Monthly Journal on Construction and Architecture), 10 (5), pp. 52–61.



  • There are currently no refbacks.


ISSN: 2500-0055