超软地基上砂袋围堰不均匀沉降处理方法

在海上超软地基施工砂袋围堰时，因地基淤泥深厚、承载力差，容易发生不均匀沉降，导致筑堤基础不稳。目前由于国家对用海审批严格，严禁超越用海使用红线，所以无法通过采用传统工艺加大底层持力砂袋或围堰前沿抛石、填土等进行压脚扩散荷载。通过对砂袋围堰形成过程的受力分析，并进行典型段试验，采用整体通长砂袋筑堤的方法，得出解决砂袋围堰不均匀沉降的更优方案，可以使砂袋筑堤过程受力均匀，减少不均匀沉降，加快施工速度。

Treatment for nonuniform settlement of sand bag cofferdam on super soft foundation

For the construction of sand bag cofferdam on the super soft foundation at sea,the cofferdam is prone to uneven settlement and unstable foundation due to the deep silt and poor bearing capacity of the foundation.At present,the state has strict approval for the sea use,and the construction process is strictly prohibited to use the red line beyond sea use.So,it is impossible to dissipate the load by using traditional technology to increase the bottom bearing sand bag or front riprap and fill of cofferdam.Through the stress analysis of the formation process of sand-bag cofferdam and based on the typical section test,we adopt integral long sand-bag embankment to deal with the uneven settlement of sand-bag cofferdam,which ensures the uniform stress in the process of the sand-bag levee construction,reduces uneven settlement,and speeds up the construction.