陈兆 陈骅伟 蒋冲 刘霖 沙策 瞿学迁

摘要：在综合分析现有水平荷载作用下桩基分析方法的基础上，建立了考虑桩侧土体受力状态的斜坡刚性桩力学模型；根据极限平衡原理，建立横向荷载作用下斜坡刚性桩弯矩和应力平衡方程；引入考虑斜坡影响的py曲线方法，提出了综合考虑桩侧土体极限承载力与水平抗力系数沿深度呈线性增加的侧向极限承载力与土体抗力承载力系数计算方法，同时，将该方法应用于计算实例，通过与已有有限元和理论计算方法对比分析，计算结果验证了本文方法的合理性与可行性；并利用该方法，分析了斜坡坡角、桩土接触面系数以及地基水平抗力系数对斜坡刚性桩承载特性的影响因素。分析表明：斜坡的坡角、桩土接触面系数对侧向荷载作用下斜坡刚性桩的荷载位移曲线影响明显，而桩侧土的抗力系数对侧向荷载作用下斜坡刚性桩的荷载位移曲线影响不明显。

关键词：斜坡；桩；水平荷载；黏土

中图分类号：TU476.4

文献标志码：A 文章编号：1674-4764（2016）03-0047-06

Abstract：The current analysis method of pile foundation under horizontal load are analyzed comprehensively. First， mechanics model of rigid pile in slope considering pile lateral stress is established. Second， according to the principle of limit equilibrium， the bending moment and stress equilibrium equation of rigid pile in slope under lateral load are proposed. Then the pile lateral ultimate bearing capacity and horizontal resistance coefficient along the depth increasing linear are developed using py curve method. The proposed method is applied in the case study， and the results verified the rationality and feasibility of this method by comparative analysis with the existing finite element calculation methods. Finally， the method is used to perform a series of parametric analyses， such as angle of slope， pile soil contact surface coefficient and horizontal resistance coefficient， and some significant conclusions are drawn. The slope Angle， contact surface coefficient of pile and soil has significant impact on the load displacement curve of rigid pile， and the resistance coefficient of pile side soil impact load displacement curve of is not obvious under the action of the lateral load.

Keywords：sloping ground； pile； lateral load； clay

水平受荷桩广泛应用于高层建筑、桥梁、海岸码头、海洋采油平台以及海上风电场等各种结构工程中，学者们对此进行了大量的研究。文献[1-3]从理论上进行了黏土中横向荷载桩的py曲线分析，李卫超等[4]通过砂土中两组水平受荷刚桩试验结果，基于 API的 py 模型，对砂土中刚性短桩的 py模型案例进行了研究， 刘红军等[5]对饱和粉土地基中进行了单桩水平静力和循环加载室内模型试验，刘严超等[6]开展了近海大直径单桩基础在水平荷载作用下的三维有限元数值分析；……