中文摘要：

为给水平荷载作用下扩底楔形桩承载力计算提供理论方法,基于常规等截面桩p-y曲线法,考虑纵向截面形式的变化,建立了水平荷载作用下扩底楔形桩的简化理论计算方法;通过与2个模型试验及其他理论计算结果的对比分析,验证了所建立理论模型的准确性和可靠性;分析了扩大头直径、楔形角、桩长、桩体弹性模量以及水平向荷载-位移等级等因素对扩底楔形桩水平向承载力特性的影响规律。结果表明：所建立的简单理论计算方法可以有效计算水平荷载作用下扩底楔形桩的承载力特性,也可以推广应用于其他纵向截面异形桩的水平向承载力设计计算中。

英文摘要：

In order to establish theoretical calculation method for bearing capacity of belled wedge pile under horizontal loading,based on p-y curves calculation method for conventional equal section pile,considering the change of longitudinal cross section forms,a simplified theoretical calculation method for belled wedge pile under horizontal loading was built.The accuracy and reliability of the theoretical model were verified by comparing the results obtained by two model tests with those by other theoretical models.The influence laws of factors including enlarged pile base,taper angle,pile length,pile modulus,and lateral load grades on the horizontal bearing capacity of belled wedge pile were analyzed.The results show that the proposed theoretical calculation method can calculate bearing capacity of belled wedge pile simply and efficiently which can be applied to the calculation of horizontal bearing capacity of other special vertical section piles.