扩底墩基础设计方法探讨

Discussion on the Design for the Expanded-Pier-Foundation

摘要: 墩基础的设计方法在现行规范中没有明确的规定，造成了土木工程设计中的浪费或安全隐患。本文分析了墩基础在岩石和非岩石地基中的受力机理和破坏模式，认为不能简单地按墩基础墩径比确定其承载力计算方法，应根据墩端地基土的特性合理确定，并提出了墩基础必须满足的独立基础和桩基础的设计构造要求。

Abstract: The design for the expanded-pier-foundation has no definition in the current criterion, causing diseconomy or safety loophole. The stress mechanism and demolition of the expanded-pier- foundation in rock foundation and foundation without rock are discussed. It is deemed that the bearing capacity of the expanded-pier-foundation should not be decided simply on the ratio of length to diameter, and it should be confirmed rationally on the soil property. Furthermore, the structural design requirement of independent and pile foundation for the expanded-pier-founda- tion is proposed.