Vertical-load design of a large-size bored pile

Abstract

The results of experimental and theoretical studies of vertically loaded large-size (from 50 and more meters long) bored pile work features are presented. The results of testing the vertically loaded large-size bored piles with a diameter of 2m, a length of 55m and 65m in clay soils by the submerged jack method are analyzed. According to the test results, the features of the soil resistance formation under the pile tip and on the side surface are identified. On this basis, the need to design such piles according to the second soil limit state, taking into account the compressibility of the pile shaft is justified. The kinematic scheme of inclusion the soil base and the pile shaft into work under vertical loading is given. On this basis, a technique for calculating the settlement of a single pile and a method for determining the allowable load on the pile are developed. This load does not allow pile settlement to exceed the allowable settlement of the designed building. An example of a bored pile calculation by the developed method is given.