Abstract
In order to reduce the differential settlement of piled raft foundations, an optimization method based on pile-to-pile interaction theory is proposed in this paper, which translates the problem of pile-to-pile interaction (PPI) in pile groups into that in single piles using the interaction factor method. The pile lengths were adjusted via the relationship between load, settlement, and the length of single piles during the optimization design. ANSYS software, in conjunction with nonlinear elastic soil model, is used to analyze piled raft foundation models. Two cases with different safety factors that suffer different kinds of surface loads (uniform load and nonuniform load) are used to verify this method. The differential settlements of the raft in different cases are all reduced by nearly or more than 80% after optimization design. The results show that the optimization method proposed in this paper has high efficiency and stability. This study can help practicing engineers optimize the pile lengths in pile groups to satisfy higher differential settlement requirements.
Highlights
Piled raft foundations (PRFs) have been used for many years as a method of transmitting the loads from the superstructure to competent strata at depth in the ground
Nguyen et al [13, 14] gave a parametric study for the optimal design of large PRFs on sand, and the results show that differential settlement could be effectively reduced by putting more piles in the center of a raft than in other areas
High calculation cost and too much iteration times are avoided during this process. e optimization results show that the differential settlements of the pile groups in different cases can be highly reduced after optimization design compared with the traditional design no matter what the load is uniform or nonuniform
Summary
Piled raft foundations (PRFs) have been used for many years as a method of transmitting the loads from the superstructure to competent strata at depth in the ground. Optimization design of PRFs with dissimilar piles (with different lengths and diameters) [4, 5] and pile arrangement [6] has drawn much attention in recent years, which can minimize the differential settlement on top of the pile group and rearrange the load distribution of a PRF. E optimization results show that the differential settlements of the pile groups in different cases can be highly reduced after optimization design compared with the traditional design no matter what the load is uniform or nonuniform High calculation cost and too much iteration times are avoided during this process. e optimization results show that the differential settlements of the pile groups in different cases can be highly reduced after optimization design compared with the traditional design no matter what the load is uniform or nonuniform
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