Interaction of multi-blade screw piles with a sandy base
Abstract
Introduction. Foundations made of multi-blade screw piles represent a promising direction in construction. However, one of the difficulties preventing their wide spread in construction involves the limits of the standard methodology for determining the bearing capacity of screw piles. This problem can be solved based on a study of interaction between various types of screw piles and dispersed soils, followed by the development of a method for calculating bearing capacity and deformations, as well as establishing design requirements.
Aim. To study the interaction of two- and three-bladed screw piles at a test site in Dzerzhinsk, Russian Federation, with a sandy base under the action of pressing and pulling loads; to assess the effectiveness of these piles in sandy soils based on their bearing capacity.
Materials and methods. We use the Plaxis 2D specialized geotechnical complex with the Coulomb-Mohr elastic-plastic soil model to assess the results of field tests and numerical simulation for multi-blade screw piles of various sizes.
Results. Experimental studies of multi-blade screw piles have demonstrated 50–90 % difference between the bearing capacity for pressing and pulling loads at the same depth of the last blade. At an increase in the size of a three-blade pile by 30 and 70 %, the bearing capacity increases by 8 and 57 %, respectively; an increase in the size of a two-blade pile by 48 % increases the bearing capacity by 5 %. The numerically calculated values of the bearing capacity for a multi-blade screw pile are generally within the permissible deviation with 30 % margin.
Conclusions. The analysis of experimental data proves that screw two-blade metal piles with a blade pitch of 5.0D and d/D ratio of 0.66 represents an appropriate design solution for sandy soils. The numerical determination of bearing capacity for a multi-blade screw pile should take into account the loosening of soils cut through with pile blades, as well as the violation of the installation technology.
About the Authors
A. G. Alekseev
Research Institute of Bases and Underground Structures named after N.M. Gersevanov, JSC Research Center of Construction; Moscow State University of Civil Engineering (National Research University); Deputy Director General for Research, JSC Research Center of Construction
Russian Federation
Russian Federation
Andrey G. Alekseev, Dr. Sci. (Engineering), Associate Professor, Head of the Center for Geocryological and Geotechnical Research; Deputy Director General for Research, JSC Research Center of Construction; Professor, Department of Soil Mechanics and Geotechnical Engineering
Ryazanskiy ave., 59, Moscow, 109428, Russian Federation; 2nd Institutskaya str., 6, bld. 1, Moscow, 109428, Russian Federation; Yaroslavskoye Shosse, 26, Moscow, 129337, Russian Federation
e-mail: adr-alekseev@ya.ru
tel.: +7 (926) 129-71-01
S. A. Vinogradova
Research Institute of Bases and Underground Structures named after N.M. Gersevanov, JSC Research Center of Construction; Moscow State University of Civil Engineering (National Research University)
Russian Federation
Russian Federation
Svetlana A. Vinogradova*, Junior Researcher, Laboratory of Frozen Soil Mechanics and Calculation of Foundations No. 8, Center for Geocryological and Geotechnical Research; Graduate Student, Department of Soil Mechanics and Geotechnical Engineering
Ryazanskiy ave., 59, Moscow, 109428, Russian Federation; Yaroslavskoye Shosse, 26, Moscow, 129337, Russian Federation
e-mail: lana_vinogradovaa@list.ru
tel.: +7 (926) 635-60-14
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Review
For citations:
Alekseev A.G., Vinogradova S.A. Interaction of multi-blade screw piles with a sandy base. Bulletin of Science and Research Center of Construction. 2025;44(1). (In Russ.)
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