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Abstract In order to study the influence of pile spacing on the structural properties of piled-raft foundation，model tests of piled-raft foundation with different pile spacings had been investigated. The results indicate that the effect of loading share ratio between pile and subsoil could be adjusted by different pile spacings. Then the mechanical properties of piled-raft foundation are regulated. The piles are mainly bearing body of piled-raft foundation being in conventional pile spacing，and the subsoil takes the second place. As the pile spacing is over 6 times of pile diameter，the shared-load effect of subsoil increases；piles go at plastically bearing capacity status earlier. Then the raft becomes the main bearing body of piled raft foundation as loading increases. With pile spacing increasing，the internal force distribution properties of raft transfer from wholly bending status to locally bending status. The uneven loading distribution regulation on pile-raft tops is affected by pile spacing. The maximal loading of pile under raft transfers from corner pile to middle pile with the pile spacing increasing. It is suggested that the effect of pile spacing on relative stiffness of raft-pile-soils and mechanical properties of piled raft foundation，such as raft bending moment and uneven distribution characteristics of piles loading，should be considered in design of piled-raft foundation.
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Received: 06 November 2012
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2013, Vol. 32 
