微型桩芯搅拌桩破坏模式与承载力设计研究

Failure Modes and Design Method of Bearing Capacity on Micro-Core Cement Mixing Piles

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。

Composite pile foundation of micro-core cement mixing piles is widely used in the coastal areas and along the Yangtze River in Jiangsu Province gradually.The constructional details and characteristics of the composite pile foundation are presented.The five-failure modes under the vertical loads are analyzed,including outer interface,non-core segments of soil-cement pile,core segments of soil-cement pile,inner interface,concrete of pile core.The bearing capacity of the composite pile,the optimal length of pile core,and the design method of the composite pile foundation are introduced based on an actual project case.