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Abstract The single pile is always loaded by the vertical，lateral and moment loads，rather than a single one and the bearing capacity of single pile is affected by the interaction among them. In order to study the behavior of lateral bearing capacity of single pile as different vertical and moment loads were applied on single pile before the lateral one，the special device for combined loads was designed and a series of model tests in sand were conducted to investigate the effects of vertical and moment load on the lateral pile top deflections，pile top rotation angle，bending moment and ground coefficient. For the piles under the vertical load less than Vu/2，the presence of vertical load improves the lateral bearing property of single pile，and lateral displacement and the maximum bending moment in pile decrease with the increasing of vertical load. However，the bending moment acted on the top of pile is harm to the lateral bearing property and the ultimate lateral bearing capacity is significantly deteriorated. The settlement is affected slightly by the lateral load when the vertical load is loaded previously. The ground coefficient decreases rapidly as the lateral deformation increases when the lateral deformation is small，and then decreases slowly and tends to be a constant value as the lateral deformation grows.
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Received: 04 May 2012
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2013, Vol. 32 
