软土地基上钢管桩围堰的基础理论研究

Basic theory of steel pile cofferdam on soft clay foundation

软土地基上的钢管桩围堰较传统土石围堰具有断面小、挡水水头高等优点,但由于长期以来缺乏系统的计算理论,仅凭经验或半经验设计和施工,安全保证率低,限制了其在工程上的运用。结合工程实例,提出了影响钢管桩围堰稳定的主要指标及计算方法,可供类似工程参考。

Comparing with the traditional earth rock cofferdam, the steel pile cofferdam has advantages of small cross-section and higher retaining water head when it is used on the soft clay foundation. But due to the lack of systemic theoretical calculation, the empirical or semi-empirical design and construction is low in safety assurance rate, therefore its application in engineering is limited. Combining with an engineering example, we present the main indicators and calculation methods which may affect the stability of the steel-pile cofferdam, and the result may serve as reference for the design and construction of similar projects.