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为研究楔形桩相对等截面桩极限承载力提高机理及楔形桩承载力特性,根据楔形桩承载机理,将楔形桩承载过程分为弹性变形及挤土塑性破坏两个阶段.假定桩侧土体发生破坏时应力状态服从Mohr-Coulomb强度准则,建立了楔形桩承载力分析模型并提出了楔形桩极限承载力增大系数.通过与已有模型试验分析对比验证了本文解答的合理性.在此基础上,分析了承载力增大系数随桩-土界面摩擦系数、楔形角、静止土压力系数等的变化规律.结果表明:本文理论方法能够较为合理地预测楔形桩的极限承载力;楔形桩承载力增大系数随着土体内摩擦角增大而增大,但随着静止土压力系数和桩-土界面摩擦系数增大而减小,同时存在特定的楔形角使得承载力增大系数最大.
In order to study the mechanism of the ultimate bearing capacity of wedge piles and the bearing capacity of wedged piles, the bearing process of wedged piles is divided into two stages, elastic deformation and plastic soil failure, according to the bearing mechanism of wedged piles. The stress state under failure is subject to the Mohr-Coulomb strength criterion, and the analysis model of the bearing capacity of the wedge pile is established and the coefficient of increase of the ultimate bearing capacity of the wedge pile is proposed. The rationality of the solution in this paper is verified by comparison with the existing model tests The results show that the theoretical method of this paper can predict the ultimate bearing capacity of wedge-shaped piles reasonably and the bearing capacity of wedge-shaped piles The coefficient of force increase increases with the increase of frictional angle inside soil, but decreases with the increase of friction coefficient of static soil pressure and pile-soil interface. At the same time, the specific wedge angle increases the coefficient of bearing capacity.