Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Abstract

Important buildings such as nuclear power plants always require stricter control of differential settlement than ordinary buildings. Therefore, it is necessary to provide an optimized design for the piled raft foundations of important buildings. In this paper, a new optimization method (using different pile diameters and different pile spacing) was proposed for the design of piled raft foundations. This method adjusts the pile diameters and pile spacing according to the stress distribution at the pile top of the initial design to achieve a more uniform settlement of the raft and stress distribution on top of piles, which can solve the differential settlement problems caused by uneven loads of the superstructure. After optimized design, the differential settlement and integral bending moment of the raft decreased more than 64% and 52%, respectively, and the differential stress on top of piles decreased by at least 63%. The new method proposed in this paper could be applied to large-scale piled raft foundations with complex superstructure loads.

Influence of Variable Rigidity Design of Piled Raft Foundation on Seismic Performance of Buildings

“…e piles are approximately 4 m apart center to center (3D), which fundamentally agrees with the dimensions used by other researchers [33,34]. In order to illustrate the problem, two variable rigidity optimized design schemes (scheme 1 and scheme 2) of the piled raft foundations are adopted in here, the details of which are in the literature [35]. e pile arrangements of the two schemes are shown in Figure 7.…”

Optimization Method of Reducing the Differential Settlements of Piled Raft Foundations Based on Pile‐to‐Pile Interaction Theory

“…(3) e results before and after optimization show that the PPI optimization method has high optimization efficiency. e DS raft is reduced by nearly 80% under uniform load and more than 85% under nonuniform load, which results in higher optimization rate compared with published works [5,41]. It can be seen that the uneven distribution of the load does not affect the efficiency of the optimization method proposed in this paper.…”

“…e DS raft always shows a higher optimization efficiency under nonuniform load because of the merging and combing of pile lengths compared with that under uniform load. Compared with the optimization method [41] proposed by the authors, the optimization method proposed in this paper is more effective: (1) the FF of differential settlement of piled raft foundation is significantly improved; (2) the realization of optimization method is more automatic, avoiding the error caused by manual participation; and (3) it is easier to change the pile length for construction compared with change pile diameter and pile spacing. via the same simulation method are obtained to establish L-S-P surface of single piles.…”

Performance Optimization of Piled Raft Foundations in Layered Soil under Uniform Vertical Loading Using Plaxis 3D

“…Consequently, "Piled Raft Foundations," a combination of two distinct systems, have been created [3]. Recently, piled raft foundations (PRFs) have become popular in high-rise and signifcant building designs for their efcient control of total and diferential settlement and their high bearing capacity [4].…”