THE LONG SHELL PILE BEARING CAPACITY CALCULATION

Abstract

A comparative assessment of the long steel shell-pile bearing capacity is carried out in conditions of deep bedding of dense soils on the example of the Crimean bridge. The soil column is represented by six layers of soil only the last sixth layer of which located at a depth of 62 m has a high bearing capacity. Three design schemes are considered, taking into account soil resistance along the outer side surface and under the lower end of the pile, along the outer and inner side surfaces of the pile, as well as along the outer side surface and under the lower end of the pile, taking into account the soil core and self-locking effect. The results of calculating the bearing capacity of the steel pile-shell for each of the design schemes are presented in tabular and graphical form. Conclusions are drawn about the nature of the change in the soil resistance forces with the depth of the pile immersion both along its outer and inner lateral surfaces as well as under its lower end. The depth at which the soil core formation begins as well as the depths within which the soil is compacted and self-locking inside the pile cavity has been established. In this case the pile begins to work as a pile with a closed lower end and a further increase in its bearing capacity occurs due to the frictional forces of the soil along the outer lateral surface. A comparison is made of the bearing capacity values calculated for each of the three design schemes with the partial value of the ultimate resistance according to immersion data with actual (measured) residual failures based on the results of field tests with dynamic load.