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Abstract For structures constructed onto pile foundations，according to embedded condition of raft，pile foundation could be distinguished into high and low raft pattern. In many practical engineering，Due to post stage settlement of unconsolidated clay or backfilled soil after construction，or other cases such as soil rheology and seismic field subsidence，all of these may lead to a separation of raft from clay surface，i.e. from original design state which raft was embedded into clay to a new state of high raft pile foundation. For static condition，this kind of separation may disadvantageously result in negative skin friction force along piles，and in turn to reduce vertical bearing capacity of piles. However，during seismic shaking condition，this study，by conducting centrifuge shaking table experiments and ABAQUS simulation on both cases，indicates that pile will undergo a higher maximum bending moment and a much larger active depth under high raft case than those of low raft case. This suggests that embedding condition plays an important role in seismic response of pile-raft foundation，it will become more disadvantageous when raft embedding condition changes from low raft case to high raft case，and should be taken into enough account on practical engineering design.
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2015, Vol. 34 
