Abstract
Combined pile raft foundations (CPRF) take into account the synergy of a raft with a group of piles in transferring the load to the ground. In many ground conditions, such foundations are optimal in both utilitarian and economic terms. Based on a literature review, it can be concluded that, despite the numerous extant calculation methods for the analysis of piled raft foundations, there is lack of research related to the possibility of using a load-settlement curve from a static pile test in the full range, in order to analyse the load-settlement curve of a pile working in a group under the raft. Furthermore, the current trend in the design of pile foundations, based on the static load test databases, encourages the formulation of methods using the results of the static pile test. These methods allow for analyses closer to the physical model. In this paper, the above research postulate was answered, formulating a mathematical model in which a particular emphasis was placed on the actual work of a single pile in the ground, taking into account the interaction among raft, piles and subsoil. The developed mathematical model was verified on the basis of the results of field research. For this purpose, the results of settlement of two tanks were used.
Highlights
The development of new methods for the analysis of combined pile raft foundations is aimed at increasing the accuracy of calculations and, their practical significance
The mathematical model of the cooperation of a combined pile raft foundation with subsoil is based on the differential equation of the plate deflection surface on elastic supports (Figure 1), under the vertical load uniformly distributed on the surface [16]:
On the basis of calculations made for the foundation of the Final cleaning tank, we can observe the largest settlements around the perimeter of the raft edge
Summary
The development of new methods for the analysis of combined pile raft foundations is aimed at increasing the accuracy of calculations and, their practical significance. It is important to develop a method using the results of the static test of a single pile to analyse the load-settlement curve of the pile working within the group under the raft. An additional advantage would be that the curve extrapolating the results of the load test would be used for the limit resistance This would enable the determination of the foundation safety factors and, if necessary, optimise the piling plan. The aim is to present a method of analysing combined pile raft foundations using the static load test curve as a boundary condition of the solution. The thesis put forward is that it is possible to use with sufficient accuracy, for practical purposes, the load-settlement curve from the static load test of a pile in full range to the analysis of the load-settlement curve of a pile occurring in a group of piles under the raft
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