中文摘要：

在均质地基中混合桩型复合地基积分方程求解方法的基础上，引入弹性层状理论，推导出层状地基中混合桩型复合地基的积分方程解答，从而建立层状地基中混合桩型复合地基较为完整的理论分析体系。通过数值计算，可求得垫层作用下桩身各点处的轴力、剪力和位移等主要工程性状，并与典型算例进行对比，验证了本文方法和计算程序的正确性。最后还针对一个工程实例进行具体分析，说明本文方法能够适用于实际工程问题，具有工程应用前景。

英文摘要：

Based on the analysis of composite foundation with hybrid piles in homogeneous soil, the solutions of composite foundation with hybrid piles in layered soil were deduced by introducing elastic layered medium theory, and then a relatively complete theoretical system to analyze composite foundation with hybrid piles in layered soil was built up. Numerical method was used to solve the integral equations, and the axial forces, shear forces and displacements along piles under the actions of cushion were obtained. Comparison with classical elastic solutions verified the accuracy of the presented method and calculating program. Finally, a practical engineering project was studied to illuminate the applicability of the presented method.