蔡来炳    （福建省建筑科学研究院  福州 350025）

[提要]  通过对118组水泥土搅拌桩的单桩承载力和复合地基承载力的现场载荷试验统计分析，研究了水泥土搅拌桩的单桩承载特性以及复合地基的承载特性，讨论了复合地基的承载力与复合地基置换率、加固深度以及承压板尺寸的相互关系，阐述了水泥土搅拌法在加固软土地基的应用中存在的主要问题，可为水泥土搅拌桩复合地基的设计和施工提供参考。
[关键词]  水泥土搅拌桩  复合地基  承载力  平板载荷试验

The bearing characteristics are described from analyzing loading tests of cement-soil pile. Based on the analysis results of plate loading tests,the behaviors of composite foundation improved by cement-soil piles are discussed. The relations of replacement ratio,strengthening depth and loading plate dimension to the bearing capacity of composite foundation are given. The problems on the application of cement deep mixing method to improve the soft soil are interpreted. Finally several suggestions for the design and construction of cement-soil-pile composite foundation are provided.
Keywords: cement-soil pile; composite foundation; bearing capacity; plate loading test