(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；3. Zhejiang Provincial Communicational and Transport Department，Hangzhou，Zhejiang 310000，China)
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.
赵春风1，2，王卫中1，2，赵 程1，2，廖乾旭3. 砂土中竖向和弯矩荷载下单桩水平承载特性试验研究[J]. 岩石力学与工程学报, 2013, 32(1): 184-190.
ZHAO Chunfeng1，2，WANG Weizhong1，2，ZHAO Cheng1，2，LIAO Qianxu3. LATERAL BEARING CAPACITY OF SINGLE PILES UNDER VERTICAL AND MOMENT LOAD IN SAND. , 2013, 32(1): 184-190.
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2013, Vol. 32 
