在分析刚性桩复合地基变形机制的基础上，提出采用桩顶垫层压缩量法计算复合地基的最大沉降量。计算中桩的沉降量根据以往桩的载荷试验资料由经验确定，主要计算桩顶垫层的压缩量，计算中考虑了垫层压缩模量随荷载水平的变化。将收集到有沉降观测资料的28个工程实例的计算结果列于表中，对其中的3个进行了详细介绍，计算结果与实测资料、规范法计算结果进行了比较。该法的计算结果更接近实测资料。

Based on analyzing the deformation mechanism of composite foundation, the maximum settlement calculation of rigid-pile composite foundation by method of compression of cushion between pile top and foundation is proposed. In the calculation the pile settlement is estimated from pile loading test data in the past. The main problem is then to focus the compression calculation of the cushion between pile top and foundation. The variation of the compression modulus of the cushion with loading level is considered in the calculation. The calculated results are compared with that collected from 28 actual projects, and three projects of them are introduced in detail. The calculated results accord well with all measured data.