Experimental and Theoretical Investigation of the Interaction of the Reinforced Concrete Screw Piles with the Surrounding Soil

Abstract

Pile foundations of buildings and structures have a wide range of types and sizes. Different types of piles interact with the surrounding soil in a specific pattern. The study examined the interaction of helical piles of reinforced concrete with the surrounding soil. The results of the interaction numerical modeling are given. The study was performed using the mathematical apparatus of the FEM with the help of the “POLUS” software. The problem statement is axisymmetric. The criterion for soil strength is Mohr-Coulomb. The influence of various factors on the carrying capacity of screw piles was numerically studied.In addition to the numerical simulation results of field tests conducted in accordance with the requirements of national standards, the dependence of the load-precipitate and results of field and numerical experiments are compared.The results of the tests proposed an analytical model to calculate the bearing capacity of the concrete screw piles. A distinctive feature is that, instead of the coefficient of friction on the lateral surface criterion, the following soil strength criterion - Mohr-Coulomb – is applied to the pile interaction with the surrounding soil. This fact allows a more reliable calculation of the screw pile bearing capacity. To calculate it, one only needs the test results of soil samples in the cut.