To analyze the load-settlement response of tapered pile and tapered pile group, a hyperbolic model and a bilinear hardening model were incorporated in the proposed approach. Based on the two proposed models, considering the concordant displacement and property of multilayered soil, an iterative program was developed to calculate the settlement of the tapered single pile. A finite difference program was employed to analyze the interaction between two piles. Then considering the boundary condition and the proposed interaction between piles, the iterative program was proposed for the settlement prediction of tapered pile groups under rigid and soft pile caps. Finally, the pile settlement and the pile group settlement predicted by the iterative programs were compared with the load-settlement response of three well-instrumented tests. The results demonstrate the validity of the simplified calculation method adopted in the prediction of load-settlement response of the tapered pile and tapered pile group.%为研究楔形单桩和楔形群桩的非线性荷载-沉降关系,根据楔形桩桩侧与桩端受力特点,假设桩侧和桩端的应力-沉降分别满足双曲线与双折线模型,同时考虑桩-土位移协调关系及土体分层特性,提出了楔形单桩在均质土和分层土中的荷载-沉降曲线计算方法.在此基础上,利用有限差分原理求解楔形桩相互作用的控制微分方程,得出了考虑楔形群桩相互影响的计算方法.进而,考虑楔形群桩之间的相互影响,依据承台性状不同分别提出了刚性和柔性承台下楔形群桩的荷载-沉降计算方法.本文方法预测结果与已有模型试验及现场试验结果对比表明:本文提出的计算方法能较好地计算均匀及分层土中楔形单桩和群桩的沉降.
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