The interaction of long and compressible piles with the surrounding and underlying subgrade soils

¹ Moscow State University of Civil Engineering, Yaroslavskoe shosse, 26, Moscow, 129337, Russia
² Samarkand State Architectural Construction Institute, Department of car roads, soil bases and foundations, 140147 Samarkand, Uzbekistan

^* Corresponding author: gic-mgsu@mail.ru

Abstract

The article specifies the formulation and solution of problems on the interaction of a long incompressible and compressible pile with the surrounding and underlying subgrade firm soil by an analytical method. It is indicated, that there is the significant effect of the compressibility of the pile shaft on the patterns of force distribution applied to the long pile top between the side surface of the pile and its lower end. The force that comes on the pile toe bulb substantially depends on the ratio of the stiffness of the surrounding and underlying soils (G₁ / G₂). With the decrease of this ratio, all things being equal, the force on the pile toe bulb increases. It grows with a decrease in the ratio of the radii of the pile and the surrounding thick-wall soil cylinder (G / a). The analysis of the problem solution showed that it is possible to find the optimal ratios between the parameters G₁ / G₂,b / a,l / a, at which the force on the pile toe bulb reaches the optimum value wherein the bearing capacity of the underlying soil is at the most used at a given degree of approximation to the limit value.