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微型桩芯水泥搅拌桩在江苏沿海沿江地区的地基加固工程中已有应用,并逐步推广。本文阐述了该复合桩的构造特点、复合桩复合地基的工作特性,分析了复合桩在竖向荷载作用下的外圈界面、无芯段桩体水泥土、有芯段桩体水泥土、内圈界面与桩芯混凝土破坏等五种破坏模式,通过工程案例介绍了复合桩的承载力、桩芯优化长度和复合桩复合地基承载力设计方法。
Micro-pile cement mixing piles in Jiangsu coastal areas along the ground reinforcement has been applied, and gradually promoted. This paper describes the structural features of the composite piles, the working characteristics of the composite foundation, analyzes the outer ring interface of composite piles under the action of vertical load, coreless pile cement soil, Circle interface and concrete core damage, five kinds of failure modes are introduced, including the bearing capacity of composite piles, the optimized length of pile core and the design method of bearing capacity of composite foundation.