Dimensional Optimization of Piled Raft Foundation

Abstract

Using a combination of pile foundation and shallow foundation (Piled Raft System) to the transmission of the loads of a tall building into the soil is an appropriate economic decision because the bearing capacity of the pile foundation and shallow foundation is fully used. Due to the interaction of these systems and the complexity of their analysis, several methods have been proposed for the analysis of their behavior. But it should be noted that so far the standards and rules have not been offered to the analysis of Piled Raft foundation. Considering the number of tall buildings and skyscrapers, reviews and analysis of Pile - Raft System are very important and maybe optimal. Generally, two methods for designing Piled Raft System have been used. In the first method, all load carried by the pile foundation and raft foundation does not bear any load. In the second method, the main load is transferred to the soil by raft foundation and pile is just used for settlement control. Obviously, using the first method, the number of piles will be calculated more than the required amount, and in the second method, the full capacity of the piles is not used. Therefore, careful analysis of the Piled Raft System can be introduced to an optimum use of the full potential of these systems. Analysis of Piled Raft System according to the interactions among soil - pile - raft has a lot of problems, however, advances in computer science and memory stick and numerical methods can be used to examine different scenarios. In this paper, the optimization of the piled raft system in different condition is evaluated.