Improvement of tubular piles by effective closure
Improvement of tubular piles by effective closure
Important problem of the piled structures design is ensuring of reasonable cost of piling. It can be provided by shortening either of piles length or the number of pipes in the pile foundation (keeping another pile’s dimensions and material properties without changes). Both such approaches should provide a required bearing capacity of the pile foundation (axial compressing loads are considered). These results may be achieved if each short-cut pile is improved and bears the same loading as a pile of normal (initially designed) length or if each pile of normal length is improved and bears larger axial force in comparison with its initially designed capacity. The aim of the presented study was to clarify some possibilities to improve the pipe pile’s bearing capacity using an internal rigid diaphragm (closure) placed inside the pile’s shaft. It increases the bearing capacity of the tubular pile due to additional soil reaction inside the shaft (it was confirmed by known on-site measurements). Laboratory research aiming to study the mentioned effect was produced with the pipe pile’s model pressed into sandy soil. These tests allowed us to clarify conditions of soil plagues formation at the pile’s tip and under the diaphragm as well as their interaction. Also, some conclusions and recommendations were made clarifying the diaphragm’s positive contribution to pile bearing capacity, the effect of the closure’s location along the pipe shaft (distance from the tip), and the influence of the diaphragm’s design (shape, etc.).
Michael P. Doubrovsky; Vladyslava Dubravina
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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