CALCULATION OF A LARGE-SIZE BORED PILE ON A VERTICAL LOAD

Abstract

Paper presents results of experimental and theoretical studies of vertically loaded large bored piles (length from 50 meters and more) performance. The analysis of O-cell load tests on vertically loaded large bored piles with 2m diameter, 55 and 65 meters length, in clay soils is carried out. According to the test results, features of an end and a shaft resistance (formation) were detected, and on this basis, a justification of necessity to calculate such piles according to the second limit state is given, taking into account the compressibility of the pile trunk. The kinemetic scheme of inclusion in the work of the soil base and the pile trunk as it is loaded with a vertical load is presented. A shown software research of piles based on pile tests on a real object. On this basis, a method for calculating the permissible settlement of a single pile and a method for determining the permissible load on the pile, at which the setting of the pile does not exceed the permissible settlement for the designed building, has been developed. An example of calculating a bored pile according to the developed method is given.