The combined piled raft foundation is unique in the sense that neither the pile group alone nor the raft by itself ensures the safety and the serviceability of the structure it supports; it is the combined system that ensures the safety and serviceability of the structure it supports. Hence a complete knowledge of the contribution of each element namely the pile, raft and the soil on the overall behavior is essential to generate an effective design. Through the results of 1g model tests performed on circular, square and rectangular piled raft the general and the interaction behavior were studied and in this paper typically the essential results of circular piled raft is discussed. A procedure for determining the limiting capacity is also outlined. The effect of any compressible layer present in the soil strata is also outlined. In short, the paper explains the overall behavior of piled raft in a comprehensive manner.