Numerical analysis of XCC pile group effect and bearing capacity of piled raft foundation

Abstract

A series of three-dimensional numerical models were established based on the field test to study the interaction of pile-raft-soil system in X-section cast-in-place concrete (XCC) piled raft foundation. The analysis of influence factors of XCC pile group effect was carried out by introducing the interaction factor of piles, and the bearing capacity of XCC piled raft foundation was discussed through comparison with XCC elevated pile foundation and single XCC pile foundation. The computed results shown that the pile location, pile number, pile and soil modulus ratio and pile spacing had a certain effect on the XCC pile group effect. The raft had a negative effect on the bearing capacity of XCC piled raft foundation compared with the foundation without rafts. The ultimate bearing capacity of XCC piled raft foundation was larger than that of XCC elevated pile foundation because the raft and pile of XCC piled raft foundation could provide stronger constraints on the soil between piles and strengthened it.