采用三维有限元、无限元耦合分析模型,并考虑了桩土体系中混凝土开裂引起的非线性、钢筋与混凝土的耦合作用等因素,研究了水平荷载作用下筒桩的承载性状。结果表明,大直径筒桩荷载-水平位移曲线呈缓变型,水平承载力主要应由桩顶的水平变形予以控制;剪力集中分布在桩顶及地面附近,建议对上两处加强配筋;当桩体周围土质条件较差时,增加桩长并不能有效地提高桩的水平承载力,且存在一个最优桩长,同时满足承载、抗弯和稳定性要求;筒桩壁厚存在临界厚度,靠增加壁厚的手段来减小桩的横向变形能力有限;随着桩径的增加,桩的水平极限承载力增加明显。 Three-dimensional finite element method and finite element coupled analysis model are adopted. Considering factors such as the nonlinearity caused by concrete cracking in pile-soil system and the coupling between reinforcement and concrete, the bearing behavior of tubular pile under horizontal load is studied. The results show that the curve of load-horizontal displacement of large-diameter tubular piles shows a gradual change. The horizontal bearing capacity should be controlled mainly by the horizontal deformation of pile tops. The shear stress is concentrated near the top of piles and the ground. When the soil quality around the pile is poor, increasing the pile length can not effectively improve the horizontal bearing capacity of the pile, and there is an optimal pile length, while meeting the requirements of bearing, bending and stability; , The lateral deformation capacity of the pile is limited by increasing the wall thickness. With the increase of the pile diameter, the horizontal ultimate bearing capacity of the pile increases obviously.